Patent Publication Number: US-6905413-B1

Title: Music game system

Description:
BACKGROUND OF THE INVENTION 
   This invention relates to a music game system in which music is made audible to a game player, and particularly to a music game system in which a plurality of music game apparatus are connected via a communication path so that a plurality of game players can simultaneously enjoy the game. 
   Quite many game systems have been proposed. These game systems include systems comprised of a special apparatus for home use and a television monitor and systems comprised of a special apparatus for commercial use, a personal computer or a workstation, a display and a sound output device. These systems are generally provided with a controller operated by a game player, a storage medium storing a game program, a CPU for executing controls to generate sounds and images based on the game program, an image processor for generating images, an audio processor for generating sounds, a monitor for displaying images, and a loudspeaker for making the sounds audible. CD-ROMs, semiconductor memories, cassettes containing built-in semiconductor memories, etc. are frequently used as the storage medium. 
   Among these game systems, especially comprised of a special apparatus for commercial use, those in which a plurality of game apparatus are connected by a communication line so that a plurality of game players can simultaneously enjoy a game are known. With this game system, a plurality of game players can compete by playing the same game. 
   In the above conventional game systems, it has been a general practice for a plurality of game players to simultaneously start the game. Particularly, known music games including dancing games in which music is played as a background music are only those which are simultaneously started by all game participants by starting the reproduction of a music number from the beginning. There has not been developed any game system in which, after a certain game player started a game, another game player can participate in the game in the middle of the music number. 
   SUMMARY OF THE INVENTION 
   It is an object of the present invention to provide a music game system which is free from the problems residing in the prior art. 
   According to an aspect of the invention, a music game system comprises: a first music game apparatus for reproducing a music for a first player; and a second music game apparatus communicable with the first music game apparatus by way of a communication path for reproducing a music for a second player. 
   The first music game apparatus is provided with: a first music data storage device for storing music data of a music number; a first music reproducer for reproducing the music for the music number based on the music data stored in the first music data storage device; a first start instructor for instructing the start of reproduction of the music number by the first music reproducer; a first reproduction controller for transferring the music data from the first music data storage device to the first music reproducer upon the receipt of an instruction from the first start instructor; and a first count value output device for outputting to the communication path a count value corresponding to the lapse of time from a starting point of the reproduction when the reproduction of the music number is started by the first music reproducer. 
   The second music game apparatus is provided with: a second music data storage device for storing the same music data as the first music data storage device; a second music reproducer for reproducing the music for the music number based on the music data stored in the second music data storage device; a second start instructor for instructing the start of reproduction of the music by the second music reproducer; a second reproducing position calculator for receiving the count value outputted from the first count value output device via the communication path upon the receipt of an instruction from the second start instructor, and calculating a reproducing position of the music number being reproduced by the first music reproducer using the received count value; and a second reproduction controller for transferring the music data after the reproducing position calculated by the second reproducing position calculator from the second music data storage device to the second music reproducer. 
   According to another aspect of the invention, also, a music game system comprises: a first music game apparatus for reproducing a music for a first player; and a second music game apparatus communicable with the first music game apparatus by way of a communication path for reproducing a music for a second a player. 
   The first music game apparatus includes: a first music data storage device for storing music data of a music number; a first music reproducer for reproducing the music for the music number based on the music data stored in the first music data storage device; a first start instructor for instructing the start of reproduction of the music number by the first music reproducer; a first reproduction controller for transferring the music data from the first music data storage device to the first music reproducer upon the receipt of an instruction from the first start instructor; and a first count value output device for outputting to the communication path a count value corresponding to the lapse of time from a starting point of the reproduction when the reproduction of the music number is started from the beginning by the first music reproducer. 
   The second music game apparatus includes: a second music data storage device for storing the same music data as the first music data storage device; a second music reproducer for reproducing the music for the music number based on the music data stored in the second music data storage device; a second start instructor for instructing the start of reproduction of the music number by the second music reproducer; a second reproduction controller for transferring the music data from the second music data storage device to the second music reproducer upon the receipt of the instruction from the second start instructor; a second count value output device for outputting to the communication path a count value corresponding to the lapse of time from a starting point of the reproduction when the reproduction of the one music number is started from the beginning by the second music reproducer. 
   Further, the first music game apparatus is provided with a first reproducing position calculator for obtaining the count value upon the receipt of the instruction from the first start instructor if the count value is outputted from the second count value output device to the communication path, and calculating a reproducing position of the music number being reproduced by the second music reproducer using the obtained count value. The first reproduction controller transfers the music data after the reproducing position calculated by the first reproducing position calculator from the first music data storage device to the first music reproducer upon the receipt of the instruction from the first start instructor if the count value is outputted from the second count value output device to the communication path. 
   The second music game apparatus is further provided with a second reproducing position calculator for obtaining the count value upon the receipt of the instruction from the second start instructor if the count value is outputted from the first count value output device to the communication path, and calculating a reproducing position of the music number being reproduced by the first music reproducer using the obtained count value. The second reproduction controller transfers the music data after the reproducing position calculated by the second reproducing position calculator from the second music data storage device to the second music reproducer upon the receipt of the instruction from the second start instructor if the count value is outputted from the first count value output device to the communication path. 
   These and other objects, features and advantages of the present invention will become more apparent upon a reading of the following detailed description and accompanying drawings. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a block diagram showing a construction of a dancing game system provided with a communication path according to an embodiment of the invention; 
       FIG. 2  is a perspective view showing an entire external configuration of the dancing game system; 
       FIG. 3  is a diagram showing a data configuration of a music data stored in a music data storage; 
       FIG. 4  is a flowchart showing an operation procedure of a single-player game (so-called “1P-game”) in which one person plays the game; 
       FIG. 5  is a diagram showing an example of a monitor display screen (music selection screen) when a single game player selects a multi-play mode; 
       FIG. 6  is a diagram showing an example of the monitor display screen (score screen) when the single game player selects a multi-play mode; 
       FIGS. 7 and 8  are a flowchart showing an operation procedure in the case that, while one game player is playing a game in the multi-play mode, another game player selects the multi-player mode to participate in the middle; 
       FIG. 9  is a diagram showing an example of the monitor display screen (music selection screen) when three game players select the multi-play mode; 
       FIG. 10  is a diagram showing an example of the monitor display screen (score screen) when three game players select the multi-play mode; and 
       FIG. 11  is a flowchart showing a procedure of calculating a reproducing position of a music number. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION 
   Referring to  FIGS. 1 and 2  showing a dancing game system provided with a communication path according to an embodiment of the invention, a dancing game system is comprised of a first game apparatus  100 , a second game apparatus  200 , a third game apparatus  300  and a fourth game apparatus  400 . The respective game apparatus  100  to  400  are connected with one another via a communication cable  500 . 
   Further, as shown in  FIG. 2 , the first game apparatus  100  includes a main game unit  101  and a step mat  110  provided in front of the main game unit  101 . The first game apparatus and the step mat  110  are connected with each other via a wire  115 . Similarly, the second game apparatus  200  includes a main game unit  201  and a step mat  210  provided in front of the main game unit  201 . The main game unit  201  and the step mat  210  are connected with each other via a wire  215 . 
   First, a dancing game played in this dancing game system is summarily described. In the first and second game apparatus  100 ,  200 , stepping sections to be stepped and stepping timings are instructed to game players standing on the step mats  110 ,  210  via images and sounds, and how precisely the game players step the stepping sections in response to the instructions is evaluated and displayed as scores. 
   For example, if another game player starts the dancing game in a multi-play mode in the second game apparatus  200  while one game player is already playing the dancing game in the multi-play mode in the first game apparatus  100 , this game system enables the another game player to participate in the game in the middle by synchronously reproducing the same music number as the one being reproduced in the first game apparatus  100  at the same reproducing position. 
   The first to fourth game apparatus  100  to  400  have the same construction. In  FIG. 1 , only essential elements of the second game apparatus  200  are shown, and the detailed internal constructions of the third and fourth game apparatus  300 ,  400  are not shown. In  FIG. 2 , the third and fourth game apparatus  300 ,  400  are not shown. 
   In  FIG. 2 , the main game unit  101  includes a rhythm sound output section  102  provided at its bottom portion, a coin slot  103  provided above the rhythm sound output section  102 , and an instructing section  104  provided above the coin slot  103 , a monitor  105  provided above the instructing section  104 , loudspeakers  106  provided at the top and electric lamps  107 . 
   The rhythm sound output section  102  has a rhythm speaker  102   a  for generating a rhythm sound at a specified low frequency, and outputs low-pitched rhythm of the music being reproduced to the game player on the step mat  110  through the rhythm speaker  102   a , taking advantage of a resonance space provided inside. 
   The instructing section  104  has a left button  104 , a right button  104   b  and a confirmation button  104   c  for permitting the game player to select a game mode and a music number to be reproduced. 
   The loudspeakers  106  are adapted to reproduce the selected music number, and the electric lamps  107  are turned on and off in synchronism with the reproduced music and the outputted rhythm to improve rhythmic sense. 
   The step mat  110  is substantially in the form of a flat mat having a specified thickness, and has a dancing area  111  which are divided into 3×3 square sections in forward and backward directions and in transverse directions with respect to the main game unit  101 . A center square section of the dancing area  111  is a home position  112 , and six square sections to the front, back, left and right and obliquely to the front from the home position  112  are stepping sections  113   a ,  113   b ,  113   c ,  113   d ,  113   e , and  113   f . Arrows indicating directions viewed from the home position  112  are written on the stepping sections  113   a  to  113   f.    
   In the respective stepping sections  113   a  to  113   f  are provided cable switches  114   a ,  114   b ,  114   c ,  114   d ,  114   e ,  114   f  (see  FIG. 1 ) as stepping motion detector for detecting whether or not the game player has stepped on the stepping section. Each cable switch is, for example, comprised of two conductors and a voltage applying device for applying a voltage between the two conductors. The two conductors are held separated from each other while no load is acting, and they are short-circuited when a load acts. With the cable switch thus constructed, whether or not the game player has stepped on the stepping section can be detected by detecting a voltage level between the two conductors. 
   The first game apparatus  100  constructs a first music game apparatus, the second game apparatus  200  constructs a second music game apparatus, the communication cable  500  constructs a communication path, the loudspeakers  106  of the first game apparatus  100  construct a first music reproducer, the instructing section  104  thereof constructs a first start instructor, and the stepping sections  113   a  to  113   f  construct first motion inputting sections, the loudspeakers  206  of the second game apparatus  200  construct a second music reproducer, the instructing section  204  thereof constructs a second start instructor, and the stepping sections  213   a  to  213   f  construct a second motion inputting sections. 
   In  FIG. 2 , the elements of the first game apparatus  100  are identified by reference numerals in the order of  100 , and the elements of the second game apparatus  200  corresponding to those of the first game apparatus  100  are identified by reference numerals in the order of  200  having the same lower two digits. The elements of the second game apparatus  200  are not described here. 
   In  FIG. 1 , the first game apparatus  100  is provided with a coin detector  121 , a music data storage  122 , a main unit  123 , a music communication unit  124 , etc. and the respective elements are connected with each other via a bus  125 . The main unit  123  includes a ROM  131 , a main memory  132 , an image memory  133  and a game controller  134 , whereas the sound source communication unit  124  includes a ROM  141 , a sound source memory  142 , a sound source controller  143 , a timer  144  and a communication controller  145 . 
   The coin detector  121  detects a coin inserted through the coin slot  103  (see FIG.  2 ), and a detection signal thereof is sent to the game controller  134 . 
   The music data storage  122  is comprised of, e.g., a CD-ROM, hard disk, semiconductor memory or like storage medium for storing music data in the form of digital data.  FIG. 3  is a diagram showing a data configuration of the music data stored in the music data storage  122 . 
   As shown in  FIG. 3 , the music data of a known data configuration having a continuous series of frames  122   c  each comprised of a header portion  122   a  and an actual data portion  122   b  is stored in the music data storage  122 . A music data is stored in the actual data portion  122   b  in a compressed manner, and a header data representing data characteristics including a sampling frequency and a channel number of the music data stored in the actual data portion  122   b  is stored in the header portion  122   a.    
   A data storage capacity of the frame  122   c  is fixed to a specified bytes (e.g., 418 bytes in this embodiment) and a reproducing time thereof is set at a specified value (e.g., {fraction (1/38.28)} sec. in this embodiment). The respective frames are independent data blocks, which can be restored to original music waves frame by frame. One music number is reproduced by continuously restoring the frames  122   c  to the music waves. 
   The data storage capacity of the frame  122   c  is changed according to the sampling frequency and set channel. In this embodiment, this data storage capacity is set at 418 bytes. 
   Referring back to  FIG. 1 , music data corresponding to a plurality of music numbers are stored in the music data storage  122  in correspondence with the names of the music numbers. The music data storage  122  constructs the first music data storage device. 
   The ROM  131  of the main unit  123  is adapted to store a game program for controlling the operation of the game controller  134 . In the ROM  131 , a stepping position instructing data used to instruct the stepping sections and timings to be stepped by the game player is stored as a game program. The stepping position instructing data corresponds to a rhythm such as simple times such as a simple quadruple time or a simple octuple time, and a plurality thereof are set in the form of a table according to degrees of difficulty. 
   The number of the tables storing the stepping position instructing data is a sum of the number of the simple times, the number of rhythms of the same simple times, i.e., corresponds to the number of music numbers available. In the case of the simple quadruple time, each stepping position instructing data is constructed by one set of data comprised of four contents of instruction in time series. In the case of the simple octuple time, each stepping position instructing data is constructed by one set of data comprised of eight contents of instruction in time series. In view of rhythm, various stepping position instructing data are prepared in which, in the case of the simple quadruple times, simple times have all the same duration or first two simple times are shorter and the latter two simple times are longer. It is preferable to prepare a plurality of kinds of stepping position instructing data of the same degree of difficulty. 
   Not only the semiconductor memory, but also a CD-ROM or a hard disk may be used as the ROM  131 . 
   The main memory  132  is comprised of a RAM or EEPROM for temporarily storing the music data and other data. The image data  133  is comprised of a RAM. An image to be displayed on the monitor  105  is written in the image memory  133 . 
   The game controller  134  is constructed by one or more CPUs and input/output circuits, etc. for controlling the entire first game apparatus  100 , and has the following nine functions (A1) to (A9). 
   (A1) Function as a game mode selector for selecting a game mode such as a beginner mode or a multi-play mode. The monitor  105  in  FIG. 2  displays a game mode selection screen. For example, an icon  105   a  represents a beginner mode, an icon  105   b  represents a non-stop mode in which a selectable music number is limited to one, and an icon  105   c  represents a multi-play mode in which a plurality of game players can simultaneously play the game. The game mode is selected by moving a cursor (indicated by, e.g., a change in color or luminance) to the left and right by using the left and right buttons  104   a ,  104   b  and confirming the selected game mode by a confirmation button  104   c.    
   (A2) Function as a team selector for selecting a team when the multi-play mode is selected as a game mode. A team is selected from a team list (including, e.g., a red team, blue team in this embodiment) displayed on the monitor  105  by operating the left, right and confirmation buttons  104   a ,  104   b ,  104   c.    
   (A3) Function as a music number selector for selecting the music number to be reproduced. The name of the music number to be reproduced is selected from a music number list displayed on the monitor  105  by operating the left, right and confirmation buttons  104   a ,  104   b ,  104   c.    
   (A4) Function of, when the game is not played in the multi-play mode in the other second to fourth game apparatus  200 ,  300 ,  400 , receiving an instruction signal outputted from the confirmation button  104   c  of the instructing section  104  and representing confirmation of the selection of the music number as a signal for instructing the start of the music reproduction; transferring the music data corresponding to the name of the selected music number from the music data storage  122  to the main memory  132  in its compressed form; further transferring it to the sound source memory  142  while expanding it to the original data; and sending a signal to the sound source controller  143  to instruct the start of the reproducing operation when a sufficient amount of data to be reproduced is transferred to the sound source memory  142 . 
   (A5) Function of, when the game is played in the multi-play mode in the other second to fourth game apparatus  200 ,  300 ,  400 , receiving an instruction signal outputted from the confirmation button  104   c  of the instructing section  104  and representing confirmation of the selection of the multi-play mode as a signal for instructing the start of the music reproduction; and calculating a reproducing position of the music number in the other game apparatus(s) based on a count value sent from the communication controller  145 . This operation procedure is described later. 
   (A6) Function of transferring the music data corresponding to a music number code from the calculated reproducing position on from the music data storage  122  to the main memory  132  based on the code and calculated reproducing position of the music number being reproduced in the other second to fourth game apparatus  200 ,  300 ,  400 ; further transferring it to the sound source memory  142  while expanding it to the original data; and sending a signal to the sound source controller  143  to instruct the start of the reproducing operation when a sufficient amount of data to be reproduced is transferred to the sound source memory  142 . 
   (A7) Function as a stepping position instructing data output device for selecting the table of the stepping position instructing data corresponding to the selected music number and outputting one set of data in the selected table to the rhythm speaker  102   a.    
   (A8) Function as a first motion instructor for replacing the stepping position instructing data by the stepping position instructing marks for each set of data, writing them in the image memory  133 , and scroll-displaying the stepping position indicating marks on the monitor  105  to instruct the stepping sections to be stepped and stepping timings to the game player. On the monitor  105 , images of the stepping position instructing marks are constantly scroll-displayed without interruption. 
   (A9) Function as an evaluator for evaluating the precision of the stepping of the game player in relation to the stepping position instructing data (i.e., whether or not the game player has stepped on the instructed stepping sections at the instructed timings), and displaying the evaluation result as a score on the monitor  105 . 
   In the functions (A4) and (A6), the reproduction starting position may be designated in unit of two bytes when the start of the reproduction is instructed to the sound source controller  143 . In such a case, the data up to the next header data are skipped if the designated address is not at the leading end of the header data. Further, if the data can be transferred from the main memory  132  to the sound source memory  142  at a specified speed or faster, i.e., at such a speed to transfer  418  or more bytes of data within {fraction (1/38.28)} sec., reproduction and transfer can be simultaneously performed without waiting until the transfer of all the data is completed. 
   The ROM  141  of the sound source communication unit  124  is adapted to store a program for controlling the operation of the sound source controller  143  and the communication controller  145 . The sound source memory  142  is comprised of a RAM or EEPROM for temporarily storing the music data. 
   The sound source controller  143  and the communication controller  145  are constructed by one or more CPUs and input/output circuits, etc. The sound source controller  143  has following three functions (B1) to (B3). 
   (B1) Function of restoring the music data stored in the sound source memory  142  to music waves of analog signals and outputting them to the loudspeakers  106  via an amplifier  126 . By this function, the music is reproduced by the loudspeakers  106 . 
   (B2) Function of calculating the position of the music data being reproduced frame by frame while the music is being reproduced. In other words, which frame the presently reproducing position is located in can be calculated in real time. 
   (B3) Function of holding a count value P 1  of the timer  144  corresponding to a lapse of time following the starting point of the reproduction while the music is being reproduced. 
   The timer  144  has an oscillating circuit of a specified frequency (e.g., 44.1 kHz in this embodiment) and acts as a counter for outputting a count value corresponding to the lapse of time. The timer  144  makes 44,100 counts within 1 sec. 
   The communication controller  145  conducts a data communication with the other second to fourth game apparatus  200 ,  300 ,  400  and has following three functions (C1) to (C3). 
   (C1) Function as a first music number information output device for outputting the music number code specifying the music number being reproduced to the communication cable  500  while the music is being reproduced. 
   (C2) Function as a first count value output device for sending the count value P 1  of the timer  144  corresponding to the lapse of time from the starting point of the reproduction to the communication cable  500  upon receiving it from the sound source controller  143  while the music is being reproduced. 
   (C3) Function of receiving the music number code and the count value outputted from the other second to fourth game apparatus  200 ,  300 ,  400  and sending them to the game controller  134  when the multi-play mode is selected in the first game apparatus  100  while the game is being played in the multi-play mode in the other game apparatus  200 ,  300 ,  400 . 
   In the first game apparatus  100 , the game controller  134  and the sound source controller  143  construct a first reproduction controller, and the game controller  134  and the communication controller  145  construct a first reproducing position calculator. 
   In  FIG. 1 , the respective elements of the second to fourth game apparatus  200 ,  300 ,  400  have the same functions as the corresponding elements of the first game apparatus  100 . 
   Specifically, the music data storage  222  of the second game apparatus  200  constructs the second music data storage device, the game controller  234  constructs a second motion instructor, the game controller  234  and the sound source controller  243  construct a second reproduction controller, the game controller  234  and the communication controller  245  construct a second reproducing position calculator, and the communication controller  245  constructs a second count value output device. 
   Next, an operation procedure of this dancing game system is described.  FIG. 4  is a flowchart showing an operation procedure of a single-player game (so-called “1P-game”) in which a single player plays the game. Here, description is given on an example in which the first game apparatus  100  is used. 
   When the first game apparatus  100  is powered, a demonstration screen is first displayed (Step ST 100 ) and continues to be displayed until a coin is inserted (NO in Step ST 105 ). When the coin is inserted (YES in Step ST 105 ), a game mode selection screen is displayed on the monitor  105  to allow a game player to select a game mode (Step ST 110 ). When the multi-play mode is selected (YES in Step ST 115 ), the music number is selected (Step ST 125 ) after the name of a team is selected (Step ST 120 ). On the other hand, if a game mode other than the multi-play mode is selected (NO in Step ST 115 ), the music number is immediately selected (Step ST 125 ). 
   Subsequently, the game is started (Step ST 130 ), and a score is displayed based on an evaluation result upon the completion of reproduction of the selected music number (Step ST 135 ). It is then discriminated whether the selected music number has been reproduced by a set number of times, or the set number of reproductions of selected music number are completed (Step ST 140 ). Unless it has been reproduced by the set number of times (NO in Step ST 140 ), this routine returns to Step ST 125  and the above operations are repeated. In the case that the non-stop mode is selected as a game mode, there is no selection of the music number for the second and subsequent times. 
   When the music numbers are reproduced by the set number of times (YES in Step ST 140 ), the display of the demonstration screen follows (Step ST 110 ) after an end credit is displayed (Step ST 145 ). 
     FIGS. 5 and 6  are diagrams showing examples of the monitor display screen when a single game player selects a multi-play mode.  FIG. 5  shows a music number selection screen and  FIG. 6  shows a score screen. 
   Since the single game player is playing the game in the multi-play mode in  FIG. 5 , only one image  105   d  simulating a dancer is displayed at the left end of the monitor  105  in the music number selection screen displayed in Step ST 125  of FIG.  4 . Here, if a red team is, for example, selected in Step ST 120  of  FIG. 4 , the image  105   d  is displayed in red. In the score screen displayed in Step ST 135  of  FIG. 4 , the name of the player&#39;s own team (red team in this example) and the player&#39;s score (740 points in this example) are displayed as shown in FIG.  6 . FIGS.  7  and  8  are a flowchart showing an operation procedure in the case that, while a single game player is playing a game in the multi-play mode, another game player selects the multi-player mode to participate in the middle. The second game player can participate in the game in the middle when the first game player already playing the game selected the multi-play mode and the second game player also selects the multi-play mode. Here, description is given on an example in which the second game player participated in the game in the middle using the second game apparatus  200  while the first game player is playing using the first game apparatus  100 . 
   In  FIGS. 7 and 8 , a flowchart executed in the first game apparatus  100  is shown by Steps ST 200  to ST 270  at the left end, a flowchart executed in the second game apparatus  200  is shown by Steps ST 300  to ST 380  at the right end, and contents relating to the communication between the first and second game apparatus  100 ,  200  are shown by Steps ST 400  to ST 430  in the middle. 
   In  FIG. 7 , when the first and second game apparatus  100 ,  200  are powered, demonstration screens are displayed, respectively (Step ST 200 , ST 300 ). When a coin is inserted in the first game apparatus  100  while the demonstration screen is being displayed, the game mode selection screen is displayed, the multi-play mode is selected and a team is selected (Steps ST 200  to ST 215 ). Since data including a music number data have not yet been transmitted from the other game apparatus when the multi-play mode is selected, the music number is selected next (Step ST 220 ) and a single-player game is started (Step ST 225 ). 
   During the game, the music number data including the music number code and the count value and the name of the selected team are constantly transmitted to the communication cable  500  in a specified sampling cycle (Step ST 400 ). 
   When a coin is inserted in the first game apparatus  100  while the demonstration screen is being displayed, the game mode selection screen is displayed and the multi-play mode is selected (Steps ST 305  to ST 310 ). Here, since the music number data and the other data are transmitted from the first game apparatus when the multi-play mode is selected, these data are received by the communication controller  245  (Step ST 315 ) and a team is selected (Step ST 320 ). 
   Next, a reproducing position of the music number being presently reproduced in the first game apparatus  100  is calculated in a procedure to be described later (Step ST 325 ) and the game is started (Step ST 330 ). 
   From this point of time on, a communication play is performed in both the first and second game apparatus  100 ,  200  (Step ST 405 ). 
   Upon the completion of reproduction of the music number, a score is displayed on the monitor  105  of the first game apparatus  100  only for a predetermined time (Step ST 230 ). 
   Upon the completion of the score display, a score display completion signal is sent from the communication controller  145  of the first game apparatus  100  to the communication cable  500  (Step ST 410 ). 
   Since no score can be calculated for the game player of the second game apparatus  200  since he participated in the game in the middle, a standby screen is displayed on the monitor  205  of the second game apparatus  200  (Step ST 335 ) and continues to be displayed until the score display completion signal is received (NO in Step ST 340 ). Upon the receipt of this signal, the display of the standby screen is completed (YES in Step ST 340 ). 
   Next, the music number is selected in each of the first and second game apparatus  100 ,  200  (Step ST 235 , ST 345 ). The selected music numbers are interchanged (Step ST 415 ). Subsequently, the music number is decided (Steps ST 240 , ST 350 ). The music number may be decided by majority or by giving a priority to the game player who started the game first. 
   Next, the decided music number is rewound to the beginning, i.e., the corresponding music data is transferred to the sound source memories  142 ,  242  (Steps ST 245  and ST 355 ). The game apparatus having completed the preparation of the reproduction sends a preparation completion signal (Step ST 420 ). 
   Next, the game system waits until the preparation of the other game apparatus is completed (NO in Step ST 250  or ST 360 ), and the game is started in the respective game apparatus (Steps ST 255 , ST 365 ) upon the receipt of the preparation completion signal from the other game apparatus (YES in Step ST 250  or ST 365 ). 
   In this way, both the first and second game apparatus  100 ,  200  perform a communication play (Step ST 425 ). 
   Upon the completion of reproduction of the music number, scores are calculated based on the evaluation results and the calculated scores are interchanged (Step ST 430 ). 
   The scores and ranking are displayed on the respective monitors using the interchanged scores (Steps ST 260 , ST 370 ). 
   It is then discriminated whether the music numbers have been reproduced by the set number of times (Steps ST 265 , ST 375 ). Unless otherwise (No in Steps ST 265 , ST 375 ), the above operations are repeated by returning to Steps ST 235 , ST 345 . 
   After the music numbers were reproduced by the set number of times (YES in Steps ST 265 , ST 375 ), the demonstration screen is displayed (Steps ST 200 , ST 300 ) after an end credit is displayed (Step ST 270 , ST 380 ). 
     FIGS. 9 and 10  are diagrams showing examples of the monitor display screens when three game players select the multi-play mode.  FIG. 9  shows a music number selection screen and  FIG. 10  shows a score screen. 
   Since three game players are playing the game in the multi-play mode in  FIG. 9 , images  105   e  (1 st  player),  105   f  (2 nd  player) and  105   g  (3 rd  player) simulating dancers are displayed in the music number selection screen displayed in Step ST 235  of FIG.  8 . These dancer-simulating images are displayed in colors corresponding to the names of teams. 
   Further, in the score screen displayed in Step ST 260  of  FIG. 8 , the name of the 1 st  player&#39;s team (red team in this example) and his score (664 points in this example), the names of the other teams (green team and blue team in this example) and their scores (505 points, 531 points in this example), and that the 1 st  player is a winner are displayed as shown in FIG.  10 . 
   Next, a procedure of calculating the reproducing position of the music number which is performed in Step ST 325  of  FIG. 7  is described with reference to a flowchart of FIG.  11 . 
   Upon the receipt of the music number data (Step ST 500 ), the frame being reproduced is calculated using the count value outputted from the first game apparatus  100  (Step ST 505 ). If P 1 , Q 1  denote the count value and the frame being reproduced, respectively, the frame Q 1  is given by:
 
 Q   1 = P   1 /44100×38.28  (1)
 
   It should be noted that Q 1  is a maximum integer not exceeding the right side of equation (1) since Q 1  is an integer. 
   Subsequently, a byte number R 1  from which on the music data should be read from the music data storage  222  is calculated based on the frame Q 1  (Step ST 510 ). The byte number R 1  is calculated by: 
     R   1 = Q   1 ×418  (2). 
   Subsequently, the game controller  234  loads the music data corresponding to the music number from the (R 1 )th byte from the leading end up to the rear end in the main memory  232 , and transfers them to the sound source memory  242  (Step ST 515 ). 
   When a sufficient amount of data to be reproduced is transferred to the sound source memory  242 , the count value is read again and the frame is recalculated (Step ST 520 ), and the position on the data file is recalculated (Step ST 525 ). This is done in consideration of the fact that the reproduction of the music in the first game apparatus  100  further progresses during the data transfer in Step ST 515 . 
   Since the music data of (R 1 )th byte to the last byte are stored in the sound source memory  242 , if the recalculated byte number is assumed to be R 2 , an instruction signal is sent from the game controller  234  to the sound source controller  243  so that the reproduction of the music number is started from the (R 2 -R 1 )th byte, and the music number is reproduced accordingly (Step ST 530 ). 
   According to the above procedure, an error of less than ({fraction (1/38.28)})sec. occurs. However, such an error is negligible in the light of sense of hearing. 
   As described above, according to this embodiment, when the music number is reproduced from the leading end in any of the first to fourth game apparatus  100  to  400 , the count value corresponding to the lapse of time from the starting point of the reproduction is outputted to the communication cable  500 . When another game player starts the game in an other game apparatus, the reproducing position of the music in the one game apparatus is calculated using the count value. Thus, in synchronism with the music being reproduced in the one game apparatus, the reproduction of this music can be started in the other game apparatus, permitting another game player to participate in the music game in the middle. This makes the music game more diverse, thereby making it more interesting. 
   Further, since the first to fourth game apparatus  100  to  400  have the identical construction, other game player(s) can participate in the game in the middle using any one of the remaining game apparatus regardless of in which game apparatus the first game player plays the music game. 
   The present invention is not limited to the foregoing embodiment and may be embodied in following manners (1) to (6). 
   (1) Although the game system is constructed by a total of four game apparatus, i.e., the first to fourth game apparatus  100  to  400  in the foregoing embodiment, the present invention is not limited thereto. The game system may be constructed by two, three, five or more game apparatus. 
   (2) Although the wired communication path provided with the communication cable  500  is formed in the foregoing embodiment, the present invention is not limited thereto. For instance, a wireless communication path may be formed using infrared rays. 
   (3) That the music numbers stored in the music data storage  122  of the first game apparatus  100  and those stored in the music data storage  222  of the second game apparatus  200  are identical is preferable because all the music numbers can be used for the multi-mode play. However, only part of the music numbers may be identical. In such a case, the music number may be selected from a group of the identical music numbers in the multi-play mode. 
   (4) Although the count value is constantly outputted from the communication controller  145  to the communication cable  500  when the reproduction of the music number is started from the beginning in the multi-play mode in the first game apparatus  100  in the foregoing embodiment, the present invention is not limited thereto. For example, the sound source controller  143  may hold the count value from the starting point of the reproduction. When the multi-play mode is selected in the other game apparatus, e.g., the second game apparatus  200 , the instruction signal given from the confirmation button  204   c  of the instructing section  204  and representing confirmation of the selection of the multi-play mode is sent from the communication controller (second start instructing signal transmitter) to the communication cable  500 . The communication controller  145  may output the count value to the communication cable  500  upon the receipt of the instruction signal from the communication cable  500 . 
   In the case that a sequence of playing the game in the first and second game apparatus  100 ,  200  is reversed in this embodiment, the communication controller  145  of the first game apparatus  100  may have a function as a first start instructing signal transmitter for sending the instruction signal given from the confirmation button  204   c  of the instructing section  204  and representing confirmation of the selection of the multi-play mode to the communication cable  500 . 
   (5) In the foregoing embodiment, the first to fourth game apparatus  100  to  400  have the identical construction, so that, even if a first game player plays the music game using any of the game apparatus, other game player(s) can participate in the game in the middle using any of the remaining game apparatus. However, the present invention is not limited thereto. For instance, other game player(s) can participate in the game in the middle using any of the second to fourth game apparatus  200  to  400  only when the first game player plays the music game using the first game apparatus  100 . 
   In such a case, it is sufficient to output the count value to the communication cable  500  only from the first game apparatus and, accordingly, the second to fourth game apparatus  200  to  400  need not have a function of outputting the count value to the communication cable  500 . In addition, the first game apparatus needs not have a function of calculating the reproducing positions in the second to fourth game apparatus  200  to  400 . 
   (6) In the foregoing embodiment, the first game apparatus  100  is provided as the first motion inputting sections with the stepping sections  113   a ,  113   b ,  113   c ,  113   d ,  113   e ,  113   f  on which the game player steps, and as the first motion instructor with the game controller  134  for instructing the stepping sections to be stepped and the stepping timings to the game player by scroll-displaying the stepping position instructing data on the monitor  105  in synchronism with the music being reproduced through the loudspeakers  106 . Likewise, the second game apparatus  200  is provided with the stepping sections  213   a ,  213   b ,  213   c ,  213   d ,  213   e ,  213   f  as the second motion inputting sections and the game controller  234  as the second motion instructor. The dancing game system is constructed by these first and second game apparatus. However, the present invention is not limited to such a dancing game system, and may be applied to any generally known music game system. 
   For example, instead of the stepping sections, first and second simulated string units each comprised of a plurality of simulated strings to be touched by fingers of a game player may be provided as the first and second motion inputting sections. The present invention may be applied to a guitar game system which is provided with such first and second simulated string units and game controllers  134 ,  234  for instructing the simulated strings to be touched and touching timings to the game player. 
   Alternatively, instead of the stepping sections, first and second simulated drum units comprised of a plurality of simulated drums to be beaten by drumsticks held by a game player may be provided as the first and second motion inputting sections. The present invention may be applied to a drum game system which is provided with such first and second simulated drum units and game controllers  134 ,  234  for instructing the simulated drums to be beaten and beating timings to the game player. 
   As described above, an inventive music game system comprises: a first music game apparatus for reproducing a music for a first player; and a second music game apparatus communicable with the first music game apparatus by way of a communication path for reproducing a music for a second player. The first music game apparatus includes: a first music data storage device for storing music data of a music number; a first music reproducer for reproducing the music for the music number based on the music data stored in the first music data storage device; a first start instructor for instructing the start of reproduction of the music number by the first music reproducer; a first reproduction controller for transferring the music data from the first music data storage device to the first music reproducer upon the receipt of an instruction from the first start instructor; and a first count value output device for outputting to the communication path a count value corresponding to the lapse of time from a starting point of the reproduction when the reproduction of the music number is started by the first music reproducer. The second music game apparatus includes: a second music data storage device for storing the same music data as the first music data storage device: a second music reproducer for reproducing the music for the music number based on the music data stored in the second music data storage device; a second start instructor for instructing the start of reproduction of the music by the second music reproducer; a second reproducing position calculator for receiving the count value outputted from the first count value output device via the communication path upon the receipt of an instruction from the second start instructor, and calculating a reproducing position of the music number being reproduced by the first music reproducer using the received count value; and a second reproduction controller for transferring the music data after the reproducing position calculated by the second reproducing position calculator from the second music data storage device to the second music reproducer. 
   With thus constructed music game system, accordingly, while a music is being reproduced in the first game apparatus, the music can be reproduced in the second music game apparatus in synchronism with the one being reproduced in the first game apparatus. Thus, while one game player is playing the game using the first music game apparatus, another game player can participate in the game in the middle using the second music game apparatus, making the game system more diverse. 
   Each of the first and second music data storage devices may store music data having a data configuration comprised of a plurality of frames divided by a specified reproducing time. In this case, the second reproducing position calculator calculates a frame corresponding to a reproducing position of the music number using the specified reproducing time and the received count value. 
   Accordingly, the frame corresponding to the reproducing position can be easily obtained by calculating the lapse of time from the starting point of the reproduction based on the count value and dividing this lapse of time by the specified reproducing time. 
   The first music data storage device may store music data of a plurality of music numbers. In this case, the first music game apparatus may be preferably further provided with a first music number information output device for outputting information on the music number being reproduced by the first music reproducer to the communication path, and the second reproduction controller obtains the information outputted from the first music number information output device, and transfers the music data of the same music number as the one being reproduced by the first music reproducer from the second music data storage device to the second music reproducer. 
   Thus, the music data of the same music number as the one being reproduced by the first music reproducer can be reproduced from the calculated reproducing position on in the second music game apparatus by outputting the information on the music number being reproduced by the first music reproducer to the communication path. 
   It may be preferable that the second music game apparatus is further provided with a second start instructing signal transmitter for transmitting the instruction from the second start instructor to the communication path, and the first count value output device outputs the count value to the communication path upon the receipt of the instruction from the second start instructor via the communication path. 
   Accordingly, the count value is outputted to the communication path from the first count value output device only when the count value is necessary in the second music game apparatus. 
   Also, an inventive music game system comprises: a first music game apparatus for reproducing a music for a first player; and a second music game apparatus communicable with the first music game apparatus by way of a communication path for reproducing a music for a second player. The first music game apparatus includes: a first music data storage device for storing music data of a music number; a first music reproducer for reproducing the music for the music number based on the music data stored in the first music data storage device; a first start instructor for instructing the start of reproduction of the music number by the first music reproducer; a first reproduction controller for transferring the music data from the first music data storage device to the first music reproducer upon the receipt of an instruction from the first start instructor; and a first count value output device for outputting to the communication path a count value corresponding to the lapse of time from a starting point of the reproduction when the reproduction of the music number is started from the beginning by the first music reproducer. The second music game apparatus includes: a second music data storage device for storing the same music data as the first music data storage device; a second music reproducer for reproducing the music for the music number based on the music data stored in the second music data storage device; a second start instructor for instructing the start of reproduction of the music number by the second music reproducer; a second reproduction controller for transferring the music data from the second music data storage device to the second music reproducer upon the receipt of the instruction from the second start instructor; a second count value output device for outputting to the communication path a count value corresponding to the lapse of time from a starting point of the reproduction when the reproduction of the one music number is started from the beginning by the second music reproducer. 
   The first music game apparatus further includes: a first reproducing position calculator for obtaining the count value upon the receipt of the instruction from the first start instructor if the count value is outputted from the second count value output device to the communication path, and calculating a reproducing position of the music number being reproduced by the second music reproducer using the obtained count value; and the first reproduction controller transfers the music data after the reproducing position calculated by the first reproducing position calculator from the first music data storage device to the first music reproducer upon the receipt of the instruction from the first start instructor if the count value is outputted from the second count value output device to the communication path. 
   The second music game apparatus further includes: a second reproducing position calculator for obtaining the count value upon the receipt of the instruction from the second start instructor if the count value is outputted from the first count value output device to the communication path, and calculating a reproducing position of the music number being reproduced by the first music reproducer using the obtained count value; and the second reproduction controller transfers the music data after the reproducing position calculated by the second reproducing position calculator from the second music data storage device to the second music reproducer upon the receipt of the instruction from the second start instructor if the count value is outputted from the first count value output device to the communication path. 
   Accordingly, while a music is being reproduced in either one of the first and second music game apparatus, the music can be reproduced in the other music game apparatus in synchronism with the music being reproduced in the one music game apparatus. Therefore, while one game player is playing the game using either one of the first and second music game apparatus another game player can participate in the game in the middle using the other music game apparatus, thereby making the game system more diverse. Further, the operability of the game system can be improved since the second game player can participate in the game in the middle using either one of the music game apparatus. 
   Each of the first and second music data storage devices may store music data having a data configuration comprised of a plurality of frames divided by a specified reproducing time. In this case, each of the first and second reproducing position calculators calculates a frame corresponding to a reproducing position using the specified reproducing time and the count values. 
   Accordingly, the frame corresponding to the reproducing position can be easily obtained by calculating the lapse of time from the starting point of the reproduction based on the count value and dividing this lapse of time by the specified reproducing time. 
   Each of the first and second music data storage devices may store music data of a plurality of music numbers. In this case, the first music game apparatus may further include a first music number information output device for outputting information on the music number being reproduced by the first music reproducer to the communication path. The second music game apparatus may further include a second music number information output device for outputting information on the music number to be reproduced by the second music reproducer to the communication path. The first reproduction controller obtains the information outputted from the second music number information output device upon the receipt of the instruction from the first start instructor, and transfers the music data of the same music number as the one being reproduced by the second music reproducer from the first music data storage device to the first music reproducer. The second reproduction controller obtains the information outputted from the first music number information output device upon the receipt of the instruction from the second start instructor, and transfers the music data of the same music number as the one being reproduced by the first music reproducer from the second music data storage device to the second music reproducer. 
   Accordingly, the music data of the same music number as the one being reproduced by the first music reproducer can be reproduced from the calculated reproducing position in the second music game apparatus, whereas the music data of the same music number as the one being reproduced by the second music reproducer can be reproduced from the calculated reproducing position in the first music game apparatus. 
   The first music game apparatus may be further provided with a first start instructing signal transmitter for transmitting the instruction from the first start instructor to the communication path. The second music game apparatus may be further provided with a second start instructing signal transmitter for transmitting the instruction from the second start instructor to the communication path. The first count value output device outputs the count value to the communication path when the instruction is sent from the second start instructor to the communication path, and the second count value output device outputs the count value to the communication path when the instruction is sent from the first start instructor to the communication path. 
   Accordingly, the count value is outputted to the communication path from the first count value output device only when the count value is necessary in the second music game apparatus, whereas the count value is outputted to the communication path from the second count value output device only when the count value is necessary in the first music game apparatus. 
   The first music game apparatus may be further provided with: a first motion inputting unit to which a game player inputs a specified motion; and a first motion instructor for instructing the specified motion to the first motion inputting unit to the game player in synchronism with the music reproduced by the first music reproducer. And, the second music game apparatus may be further provided with: a second motion inputting unit to which a game player inputs the specified motion; and a second motion instructor for instructing the specified motion to the second motion inputting unit to the game player in synchronism with the music reproduced by the second music reproducer. 
   Accordingly, a music game full of throbbing excitements can be realized. Another game player can participate in this music game in the middle in addition to the game player already playing this game. This increases competitiveness of the music game. 
   The first motion inputting unit may be provided with a plurality of motion inputting sections to which a game player input the specified motion. And, the second motion inputting unit may be provided with a plurality of motion inputting sections to which a game player input the specified motion. The first motion instructor instructs to the game player a motion inputting section to which and a timing at which the game player inputs the specified motion. The second motion instructor instructs to the game player a motion inputting section to which and a timing at which the game player inputs the specified motion. 
   Accordingly, a music game full of throbbing excitements and motions can be realized. 
   Each of the first and second motion inputting sections may be comprised of a plurality of stepping sections on which the game player step. And, each of the first and second motion instructors instructs a stepping section to be stepped and a stepping timing to the game player. 
   Thus, a dancing game can be realized as a music game full of throbbing excitements and motions. 
   As this invention may be embodied in several forms without departing from the spirit of essential characteristics thereof, the present embodiment is therefore illustrative and not restrictive, since the scope of the invention is defined by the appended claims rather than by the description preceding them, and all changes that fall within metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to embraced by the claims.