Apparatus for reproducing a video signal

Abstract: In a reproducing apparatus of the video tape recorder or the like, which is capable of intuitively determining the search status and is capable of conducting search by an easy operation. The reproducible region is displayed on a graph, and a search marker and a reproducing position are indicated on the graph. Furthermore, it is possible to set the search marker on the graph.

Description: The present invention relates to an apparatus for reproducing a video signal, and in particular to a reproducing apparatus such as a video tape recorder which can execute various operations such as searching for a desired record content, for example. In the video tape recorder, there have been heretofore proposed various kinds of operation methods for improving facility for use, which are capable of searching for a desired record content with ease. More specifically, in video tape recorders having simple constructions it is possible to search for the desired record content by repeating fast forward mode and reproducing mode, visually confirming the tape counter, for example. On the other hand, there is another method of searching the record content by fast forwarding while reproducing the picture, for example. In the method using the repeating of the fast forward mode and the reproducing mode, and the method using the fast forwarding while reproducing the picture, there is however a disadvantage that desired record content cannot be searched with ease. For this reason, it is proposed to search the record content by referring to index signals previously recorded in a control track or the like. However, there is a problem in that it is hard to intuitively determine the time necessary for the search, the feed of the magnetic tape for the search, etc., in all these cases, i.e. the repeating of fast forward mode and reproducing mode, fast forwarding while reproducing the picture, and referring to index signals. Particularly in the video tape recorder, there is the disadvantage that it takes time also in conducting fast forward and reversing of a magnetic tape. It is considered that if in such an event, it were possible to intuitively determine the current position, a marker position, etc., under search, this kind of reproducing apparatus would be enhanced in operability and become convenient. More specifically, in the case where the reproducing speed is controlled using operation buttons in video tape recorders, there are, as shown in Fig. 1 of the accompanying drawings, arranged operation buttons 2, which indicate the reproducing speed, in addition to the operation buttons 1 such as play, fast forward and reverse buttons. This enables the reproducing speed to be changed to 1/10 time speed, 1/5 time speed and twice speed by pressing respective operation buttons having 1/10, 1/5 and x2 indicated on them after the play button, for example, is depressed. The reproducing speed may be changed by such a simple operation as to press operation buttons 2. In another case of using a so-called shuttle ring 4 as shown in Fig. 2, the video tape recorder switches the reproducing speed in response to the amount of revolutions of the shuttle ring 4, and the reproducing speed may be continuously changed in response to the user's operation. In controllers for exclusive use in video tape recorders, the operation buttons and the shuttle ring as shown in Figs. 1 and 2 are displayed in exclusive screen, and the reproducing speed may be indicated through the display screen. However in the case where the operation buttons of the reproducing speed are merely arranged as shown in Fig. 1, the reproducing speed is limited to the range which can be set by operation buttons, and there is furthermore a disadvantage in that the reproducing speed may not be continuously changed. Moreover, there are the disadvantages that the area required to accommodate the operation buttons increases, and that it is hard to sensitively grasp the reproducing speed. In the case of using a shuttle ring, it is hard to start reproducing speed at a desired reproducing speed at once. Furthermore in the case of combination with an operation button such as an ordinal reproducing button, switching of the mode between the operation button and the shuttle ring is necessary for each time. Even if the shuttle ring is used, there is a disadvantage in that it is hard to intuitively grasp the reproducing speed, and as a result, it is still deficient in operability. JP-A-62/241193, representing the closest prior art, discloses a video tape editor in which moving markers on a bar graph are used to show the status of source or target tapes and whether their places have been adjusted. The position of a cursor on the graph is controllable by a user. In view of the foregoing, an object of the present invention is to provide an apparatus for reproducing a video signal which is capable of intuitively determining the search status in searching the record content and improving a facility for use. According to the present invention, there is provided an apparatus for reproducing a video signal, the apparatus comprising: reproducing means for reproducing a video signal from a recording medium; command input means for inputting a command for controlling the operation of said reproducing means; display means for displaying a reproduction status of said reproducing means; control means for controlling said reproducing means in response to said command and to send information regarding said reproducing state to said display means; characterised in that: said display means is adapted to display a graph representing the reproducible region of said recording medium, a marker on said graph representing the current position of said reproducing means, and a pointer whose position is controllable by a user using said command input means; and said control means is adapted, on inputting of said command, to control the reproducing means to advance or reverse said recording medium at a speed greater than the speed of normal reproduction to a marker reproduction position on the recording means corresponding to the position of said pointer on said graph when said command was input. In a reproducing apparatus, a reproducible region of the recording medium may be displayed in a graph, and the record content of the recording medium is intermittently displayed along the graph. The search status can be intuitively grasped by displaying a reproducible region in a graph, having the current reproduction position M and the marker reproduction position L indicated on the graph. In this event, the operability is enhanced by inputting the marker reproduction position L through the graph. The invention will be further described by way of non-limitative example with reference to the accompanying drawings, in which:- Fig. 1 is a schematic diagram for illustrating the conventional switching of the reproducing speed, using the operation button; Fig. 2 is a schematic diagram for illustrating the conventional switching of the reproducing speed, using the shuttle ring; Fig. 3 is a block diagram illustrating a reproducing apparatus according to one embodiment of the present invention; Fig. 4 is a schematic diagram showing a display picture which is constructed by the controller; Fig. 5 is a schematic diagram showing the search bar; Fig. 6 is a flowchart for illustrating the operation of the search control means; Figs. 7A to 7D are schematic diagrams illustrating the setting of the search marker; Fig. 8A and 8B are schematic diagrams for illustrating the icons showing the moving direction; Fig. 9 is a schematic diagram for illustrating the switching thereof; Figs. 10A to 10D are schematic diagrams for illustrating a case of displaying also time codes; Figs. 11A and 11B are schematic diagrams for illustrating a case of setting the search marker, making the length of the marker variable; Figs. 12A and 12B are schematic diagrams for illustrating a case where the marker is displayed in bar graph; Fig. 13 is a schematic diagram for illustrating a case where the leading and trailing ends of the magnetic tape are displayed by time codes; Fig. 14 is a schematic diagram for illustrating a case of displaying the search marker by the time code; Fig. 15 is a schematic diagram for illustrating a case using the symbol of the pedestrian as the icon; Fig. 16 is a schematic diagram for illustrating a case using the symbol of the horse as the icon; and Fig. 17 is a schematic diagram for illustrating a case using the symbol of the automobile as the icon. Preferred embodiments of this invention will be described with reference to the accompanying drawings: First Embodiment (1) General Construction of Reproducing Apparatus In Fig. 3, 10 generally designates a reproducing apparatus which controls the operation of the video tape recorder (VTR) 12 by a controller 14. Here, the controller 14 is capable of controlling the operation of the video tape recorder 12 by manipulating a mouse 16 visually confirming a predetermined display picture. More specifically, in the controller 14, control signals are sent out from a command memory means 18 to the video tape recorder 12 through a communication means 17 which is a data input/output circuit, and thereby the operation of the video tape recorder 12 is controlled. In the controller 14, operation information of the video tape recorder 12 is inputted through the communication means 17 in this event, and information, such as the reproducing speed, time codes, etc., of the video tape recorder 12, is stored in a current status memory means 20 which is a memory circuit. In such a fashion, the controller 14 is capable of setting operation modes, sending out control signals to the video tape recorder 12, and is furthermore capable of monitoring the reproducing position. Moreover in the controller 14, operation data is inputted through mouse control means 22 which is a coordinate data input circuit when the mouse 16 is manipulated. Furthermore, in the controller 14 the operation data is stored in a mouse button memory means 24 and a mouse cursor position memory means 26, and thereby the button operation of the mouse 16 and the coordinate data indicated by the mouse 16 are individually accumulated. Moreover in the controller 14, a cathode ray tube (CRT) 30 is driven through a display picture forming means 28 which is a video signal processing circuit, and thereby a necessary display picture which is necessary for the operation of the video tape recorder 12 is formed in the cathode ray tube 30. In this event the display picture forming means 28 displays a predetermined lever or the like on the basis of coordinate data stored in an animation icon memory means 31 which is a picture memory, a search marker position memory means 32 which is a memory circuit, a point A position memory means 34, and a point B position memory means 36. Furthermore in the display picture forming means 28, picture display positions of a cursor (in this embodiment a symbol of a man's hand having the index finger extended), a lever, etc., are switched on the basis of coordinate data stored in the mouse cursor position memory means 26, so that display positions of levers, etc., may be switched by operating the mouse 16. In addition, in the display picture forming means 28 the display picture is switched according to the operation status of the video tape recorder 12 stored in the current status memory means 20, so that the search status is visually confirmed. In this event, in the controller 14, the position or the like of the mark on the display picture is selected by a status memory means 38 on the basis of the current status memory means 20, and thereby the search status may be intuitively grasped visually confirming the display picture. On the other hand, a search control means 40 which is an operation processing circuit switches the display picture of the cathode ray tube 30 and the operation of the video tape recorder 12 by controlling the whole operation of the controller 14. When the search control means 40 is set in the search mode in this event, it executes a predetermined procedure to thereby display the search status of the video tape recorder 12 on the cathode ray tube 30, and this enables the reproducing apparatus 10 to be enhanced in operability. (2) Production of a Display Picture Here, the search control means 40 displays a predetermined display picture when the power is turned on. When in this event, the control mode of the video tape recorder 12 is set, the display picture of the cathode ray tube 30 is switched. More specifically, the search control means 40 outputs control data to the video tape recorder 12 through the command memory means 18, and thereby the video tape recorder 12 is initialized. Subsequently, the search control means 40 reads in the current status data of the video tape recorder 12 through the current status memory means 20, and on the basis of this it is detected whether or not the power of the video tape recorder 12 is turned on, and whether or not a cassette tape is loaded. In this event, the search control means 40 stores data of reproducible region of the video tape recorder 12 in the current status memory means 20, and on the basis of the corresponding speed data a display picture is produced on the cathode ray tube 30. More specifically, in the video tape recorder 12, the index region which is provided on the magnetic tape is reproduced, and thereby the magnetic tape length data which is recorded in the region is sent out as reproducible region data. In the case where no magnetic tape length data is recorded in the region or a magnetic tape not having the region provided is reproduced, the reproducible time is temporarily set to 120 minutes, and is stored in the current status memory means 20. When in this occasion, the user inputs the length of the magnetic tape, the temporarily set reproducible time is updated to the user input time. Furthermore, the search control means 40 outputs control data to the display picture forming means 28, so that a display picture as shown in Fig. 4 is displayed on the cathode ray tube 30. Here in the display picture of the cathode ray tube 30, a display region AR1 is formed in the upper center, and a reset switch "RESET" is displayed on the right. In this event, a picture "0:00:00:00" is displayed in the display region AR1 of the time code since the video tape recorder 12 is in the initial state. The search control means 40 displays a message "DEVICE 1", which is a unit number of the video tape recorder 12, in the upper right portion of the screen. Moreover, the search control means 40 displays a reproducible reproducing speed of the video tape recorder 12 in bar graph (hereinafter referred to as speed control bar) below the display region AR1. Furthermore, the search control means 40 displays operation buttons of play, fast forward, reverse, stop and pause below the speed control bar. Thus, by clicking an operation button of play, fast forward, etc., or a predetermined position of the speed control bar through the mouse control means 22 the search control means 40 switches the reproducing speed of the video tape recorder 12 in response to the corresponding operation. This enables the reproducing speed of video tape recorder 12 to be intuitively grasped, and the reproducing speed to be switched with ease. In the vicinity of the picture of the operation buttons, the search control means 40 displays operation buttons such as "TIMECODE" indicating the time code being displayed, index using search operation buttons "-" and "+", and a frame switching operation button "FRAME". Furthermore in the lower right corner of the display picture, there are formed display regions for "SEARCH", "FADER", "REC" and "SETUP" which indicate display modes of the lower row of the display picture. The display modes of the lower row of the display picture are switched by clicking corresponding regions. When the indicia of the "SEARCH" is clicked in this event, the search control means 40 switches the display mode to the search mode, and a bar graph (hereinafter referred as search bar) is displayed in a lower central portion of the screen. Then, the search control means 40 indicates the current reproducing position and a position of the search marker by displaying symbols on the search bar, the symbols including a marker and a lever. This enables the search status to be visually grasped. The user can therefore intuitively grasp the search status, and accordingly the reproducing apparatus 10 is enhanced in operability. The search control means 40 furthermore makes it possible to move the mouse 16 after clicking the mouse 16 on the search bar and to thereby indicate a search range using the search bar. This improves the operability. Moreover, the search control means 40 displays words "START" and "END" respectively representing the leading end and trailing end of the magnetic tape, and a word "SEARCH" indicating that the search is on. The reproducing time (120 minutes in this case) of the magnetic tape which is stored in the current status memory means 20 is displayed below the search bar. The search control means 40 furthermore displays operation buttons, such as "TIMECODE", "HMS" and "DATE", which are referred to when the record content is searched with reference to the time code, the record date, the record time, etc.. Search Mode Here, as shown in Fig. 5, the search control means 40 displays the current reproducing position and the search marker position by indicating a marker M and a lever L on the search bar. In this event, the search control means 40 stores position information of the leading end and trailing end of the magnetic tape to the point A position memory means 34 and the point B position memory means 36. This makes the search bar and the magnetic tape correspond to each other at a ratio of 1:1. Moreover the search control means 40 executes the procedure as shown in Fig. 6, and thereby a search is conducted in response to the mouse 16. More specifically, the search control means 40 proceeds from the step SP1 to the step SP2, where the memory of the mouse button memory means 24 is read out, so that information as to whether or not the mouse button is operated on is read in. Subsequently, the search control means 40 goes to the step SP3, in which the position information of the mouse 16 is taken out by reading out the memory of the mouse cursor position memory means 26. Then, the search control means 40 goes to the step SP4. Here, the search control means 40 searches the memory of the current status memory means 20, and judges whether the controller 14 is set in the setting mode of search marker (hereinafter referred to as dragging) or in search mode. In the case where the controller is not set to either mode (hereinafter referred to as idle), the search control means 40 proceeds to the step SP5. On the basis of the result read in the step SP2, it is judged whether or not the mouse button is pressed down. When negative result is obtained here, then the search control means 40 returns to the step SP2. Thus, the search control means 40 repeats the procedure including the steps SP2-SP3-SP4-SP5-SP2, and waits for the pressing of the mouse button. When the mouse button is pressed in this state, affirmative result is obtained in the step SP5, and therefore it goes to the step SP6, where on the basis of the detection result of the cursor position it is judged whether or not the marker M is indicated by the mouse 16. In the case where negative result is obtained here, the search control means 40 returns to the step SP2 when it judges that an operation button of reproduction, etc., is pressed, after it outputs a control signal to the video tape recorder 12 in response to the operation button. When it is judged that the user's maloperation has been made, it directly returns to the step SP2. In the case where on the contrary the search bar is indicated, affirmative result is obtained in the step SP6, so that the search control means 40 proceeds to the step SP7 where discrimination data representing that dragging is on is stored in the status memory means 38, and then goes to the step SP8. Here, after the x coordinate indicated by the mouse 16 is entered, the search control means 40 detects the position of the magnetic tape on the search bar from the x coordinate. Furthermore, the search control means 40 returns to the step SP2 after the selected position of the magnetic tape is stored as the search marker position in the search marker position memory means 32. Subsequently, the search control means 40 goes from the step SP3 to the step SP4, where it goes to the step SP9 since the status memory means 38 is set to dragging on. Here, the search control means 40 judges whether or not the mouse button is still pressed down. When affirmative result is obtained, it goes to the step SP8. Thus, the marker is indicated by the cursor and the mouse 16 is moved holding down the mouse button. Then, the search control means 40 repeats the procedure of the steps SP2-SP3-SP4-SP9-SP8-SP2, so that the contents of the search marker position memory means 32 are sequentially updated. Accordingly, as shown in Figs. 7A to 7D, the user indicates the marker M by the cursor K (Fig. 7A), and then a search marker position may be inputted by moving the mouse 16 in the direction of the search marker (the direction indicated by the arrow a) with the mouse button held down. In this event, the lever L is moved to follow the movement of the cursor K on the display picture by updating the contents of the search marker position memory means 32 (in Fig. 7B). This enables the user to recognize the search marker position with ease. When the user releases the mouse button in this state, the search control means 40 goes to the step SP10 since in the step SP9 negative result is obtained. Here, the search control means 40 returns to the step SP2 after it sets the contents of the status memory means 38 during the search. From the foregoing, in the controller 14 it is possible to input a search marker position using the search bar having a reproducible region displayed in the bar graph. In this event, the length to the search marker can be visually grasped using the search bar. When the search mode is once set, the search control means 40 proceeds from the step SP4 to the SP11. Here, the search control means 40 outputs a display switch signal to an animation icon memory means 31. As a result, the search control means 40, as shown in Figs. 8A and 8B, displays an icon on a side of the marker opposite to the search direction, the icon being like smoke trailing (Figs. 8A and 8B). This enables the user to visually grasp the search direction. In this event, as shown in Fig. 9 the search control means 40 sequentially switches three kinds of icons ICO1, ICO2 and ICO3 different in the shape of tails in a loop manner, so that the user can visually understand that the magnetic tape is traveling. Subsequently, the search control means 40 goes to the step SP12, where it outputs a search control signal to the video tape recorder 12 through the command memory means 18. When the distance from the current reproducing position to the search marker is long, in response to this the video tape recorder 12 fast forwards the magnetic tape. Then the video tape recorder 12 turns in reproducing mode when the current reproducing position comes close to the search marker, and the traveling speed of the magnetic tape is gradually decreased. When on the contrary the distance to the search marker is short, the video tape recorder 12 turns in fast forward reproducing mode, and gradually reduces the traveling speed of the magnetic tape as the search marker comes near. In this fashion, the record contents can be searched by such a simple operation as to move the mouse to a desired position with the mouse clicked. As a result, the reproducing apparatus 10 can be enhanced in operability. Furthermore, the search marker position may be set on the search bar, and it is therefore possible to sensitively grasp the search amount, so that an improvement in operability is achieved. Then, the search control means 40 goes to the step SP13, where it is judged whether or not the search marker position and the current reproducing position are the same. When negative result is obtained here, it returns to the step SP2. Therefore, the procedure of the steps SP2-SP3-SP4-SP11-SP12-SP13-SP2 is repeated until the current reproducing position reaches to the search marker position. When the magnetic tape travels to the search marker position, affirmative result is obtained in the step SP13, so that the search control means 40 proceeds to the step SP14, where the contents of the status memory means 38 are changed to data representing an idle state. Then, the search control means 40 returns to the step SP2. If the mouse 16 is moved with the mouse button once held down, on the display picture the marker M moves toward the lever L expressing the search marker as the magnetic tape travels (Fig. 7A). When the marker reaches to the search marker, the display picture returns to the original display status (Fig. 7D). This enables the user to visually grasp the search status, visually confirming the position of the marker M which travels on the search bar. The reproducing apparatus 10 is therefore enhanced in operability. The three kinds of icons which are different in tail shape are displayed circularly switching them, and this relieves boredom of the user. (3) Advantageous Effects of the Embodiment According to the foregoing construction, a reproducible region is displayed in a bar graph, and on the graph a reproducing position and a search marker position are indicated. Therefore, the search status can be visually recognized, so that the reproducing apparatus can be enhanced in operability. Moreover, the search marker may be indicated on the bar graph, and therefore the search status may be intuitively and easily grasped. (4) Other embodiments Although in the embodiment previously described there is stated a case where the current reproducing position and search marker position are displayed using rectangular symbols, the present invention is not limited to this. Various symbols may be widely used. As shown in Figs. 10A to 10D, for example, to correspond to Figs. 7A to 7D, in such a case, time code display regions are secured, and time codes of the current reproducing position and the search marker position may be displayed within the marker and the bar (Figs. 10A to 10D). Furthermore, as shown in Figs. 11A and 11B, a rectangular marker may be used, and a search marker position and the current reproducing position may be expressed according to the size of the marker (Figs. 11A and 11B). Moreover, as shown in Figs. 12A and 12B, the magnetic tape may be expressed by a thick bar graph from the leading end to the current reproducing position, and the search marker position may be expressed by the lever L (Figs. 12A and 12B). In the foregoing embodiment, it is described that the length of the magnetic tape is displayed below the search bar. The present invention is not limited to this and for example, as shown in Fig. 13, time codes of the leading and trailing ends may be displayed. Furthermore, as illustrated in Fig. 14, the time code of the search marker position may be displayed in the vicinity of the search bar. Moreover in the embodiment previously described, it is stated that the traveling direction of a magnetic tape is indicated using a symbol of a tail trailing smoke. The present invention is not limited to this, and as illustrated in Figs. 15 to 17, the current reproducing position and the magnetic tape traveling direction may be expressed using symbols representing a pedestrian, an animal, an automobile, etc.. Furthermore, the magnetic tape traveling speed may be expressed switching such indicia. In the above-described embodiment, it is described that the overall length of the magnetic tape is expressed by the search bar, but the present invention is not restricted to this. For example, a reproducible region set by the user may be displayed. In addition to the main search bar indicating the overall length of the magnetic tape a sub-search bar which shows a status in the vicinity of a search marker may be displayed, so that the user may finely recognize a search marker position. Furthermore, such a sub-search bar may be displayed during search only when the search marker position becomes close if necessary. In the embodiment previously described, it is further stated that the magnetic tape traveling speed is switched according to a distance to a search marker on the side of the video tape recorder. The present invention is however not limited to this, and it may be switched on the controller side. In this case, the magnetic tape traveling speed may be switched according to the traveling speed of the mouse. In the preceding embodiment, it is further described that the search bar is merely displayed. The present invention is, however, not limited to this, and in the case where a size reduced still picture, for example, is displayed along the search bar, recorded positions of search index signals may be also displayed. Moreover in the previously-described embodiment it is stated that the operation is switched using the mouse. The present invention is not limited to this, and various kinds of data input means, such as a write pen, a tablet, a touch screen, may be widely used. In such cases, a roller and an execute button, for example, may be used. Furthermore, a joystick and an execute button or a plus and minus operation buttons and an execute button may be combined. Moreover in the embodiment previously described there is stated a case in which the operation of the video tape recorder is switched using a microcomputer. The present invention is however not restricted to this, and may be widely applied to a case where control means such as a remote commander is used. In such a case, a speed control bar may be displayed superimposing it over a reproduced picture. In the previously described embodiment, there is described a case where a reproducible speed is horizontally displayed in bar graph but the present invention is not limited to this. The reproducible speed may be displayed vertically or diagonally. Further, the reproducible speed may be displayed in a desired curve such as an arc and a spiral. Moreover, the case where the record content of the video tape recorder is searched is stated in the foregoing embodiment, but the present invention is not limited to this. The present invention may be widely applied to reproducing apparatus which output reproduced signals from various recording media such as a compact disk player.

Claims: An apparatus for reproducing a video signal, the apparatus comprising: reproducing means (12) for reproducing a video signal from a recording medium; command input means (16) for inputting a command for controlling the operation of said reproducing means; display means (30) for displaying a reproduction status of said reproducing means; control means (14) for controlling said reproducing means in response to said command and to send information regarding said reproducing state to said display means; said display means is adapted to display a graph representing the reproducible region of said recording medium, a marker (M) on said graph representing the current position of said reproducing means with respect to said reproducible region, and a pointer (K) whose position with respect to said reproducible region is controllable by a user using said command input means; characterised in that : said control means is adapted, on inputting of said command, to control the reproducing means to advance or reverse said recording medium at a speed greater than the speed of normal reproduction to a marker reproduction position (L) on the recording means corresponding to the position of said pointer [K] on said graph when said command was input. Apparatus according to claim 1 wherein said display means is adapted to display a search marker icon (L) at the position of said pointer on said graph when said command was input. Apparatus according to claim 1 or 2 wherein said display means is adapted to display on said graph an icon representative of the operational status of said reproducing means. Apparatus according to claim 1, 2 or 3 wherein said control means is adapted to control the reproducing speed in response to the quantity of recording medium remaining between said current reproducing position and said marker reproduction position. Apparatus according to claim 1, 2, 3 or 4 wherein said reproducing means is adapted to reproduce said video signal during advancing or reversing to said marker reproduction position. Apparatus according to any one of the preceding claims wherein said display means is adapted to display an icon representative of the direction of movement of the recording medium during advancing or reversing to said marker reproduction position. Apparatus according to claim 6 wherein said display means is adapted to display cyclically a plurality of different icons representative of said direction of movement. Apparatus according to any one of the preceding claims wherein said recording medium is a magnetic tape. Apparatus according to any one of the preceding claims wherein said command input means comprises a mouse with a button.

Inventors: SHIMA HISATO, TERASAWA HIDEO, YAMANAKA BRIAN TORU, SHIMA, HISATO, TERASAWA, HIDEO, YAMANAKA, BRIAN TORU, SHIMA, HISATO, C/O SONY CORPORATION, Terasawa, Hideo, c/o Sony Corporation, Yamanaka, Brian Toru, c/o Sony Corporation
Applicants: SONY CORP, SONY CORPORATION
Application year: 1992
Main classification: G11B15
IPC codes: G11B27, G11B15, G11B33