Remote control system for video camera

Abstract: A remote control apparatus includes a monitor television (32) capable of displaying an image according to a video signal sent from a camcorder (1) through a video signal line (50). An operating portion of the remote control apparatus includes keys (34a), and a microcomputer (34b) which generates a control signal according to a key input from the keys. The control signal is applied to an infrared ray emitting device (42) when the apparatus (31) is not connected to the camcorder (1) such that the camcorder (1) can be wireless-controlled. If the apparatus (31) is connected to the camcorder (1) through a control signal line and the video signal line, the control signal is applied to the camcorder (1) through the control signal line, and a control signal for controlling a rotation table (21) of the camcorder is applied to the infrared ray emitting device (42), and therefore, the camcorder can be wire-controlled and the rotation table can be wireless-controlled.

Description: BACKGROUND OF THE INVENTION Field of the invention The present invention relates to a remote control system. More specifically, the present invention relates to a remote control apparatus having a monitor television capable of displaying an image according to a video signal sent from an electronic equipment such as a video camera or a camcorder through a video signal line, and to an electronic equipment control system utilizing such a remote control apparatus. Description of the prior art One example of a conventional remote control apparatus with monitor television is disclosed in, for example, Japanese Patent Application Laying-open No. 57-166782 (H04N5/26) laid-open on October 14, 1982. In this prior art, a video camera and a remote control apparatus are connected to each other through a cable for transmitting a video signal from a camera circuit of the video camera to the remote control apparatus and a control signal from the remote control apparatus to the video camera. Then, an image according to the video signal is displayed on a view finder provided on the video camera. Furthermore, another example of a remote control apparatus is disclosed in, for example, Japanese Patent Application Laying-open No. 1-227580 (H04N5/232) laid-open on September 11, 1989. In this prior art, the remote control apparatus has a function of a remote control by utilizing an infrared ray, and a video signal transmitted from a video camera by an electronic wave is received and displayed by an electronic view finder. In the former remote control apparatus, it is impossible to wireless-control the video camera. Furthermore, in the latter remote control apparatus, a transmitter and a receiver for transmitting and receiving the video signal of the electronic wave are required, and therefore, a cost of the system becomes high as a whole. In the former remote control system, it is impossible to wireless control the video camera. Furthermore, in the latter remote control system only the functions of the video camera are controlled. JP-A-03295371 discloses a remote system for controlling a first and a second piece of electronic equipment using a remote control apparatus having a television monitor capable of displaying an image according to a video signal received from said first piece of electronic equipment. The electronic equipment includes video signal generation means for generating said video signal, and the remote control apparatus comprises wireless control means for applying first and second control signals to said first and second electronic equipment using an infrared ray. On the other hand, JP-A-58222077 discloses a remote control system for controlling a piece of electronic equipment generating a video signal. The remote control apparatus comprises wire control means for applying a control signal to said piece of electronic equipment using an electric signal through a control line, wireless control means applying a control signal to said piece of electronic equipment using a light wave, connection detection means for detecting connection of said remote control means to said piece of electronic equipment and function stopping means for inhibiting at least one of the functions of said wireless control means when said connection is detected by said connection detecting means. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a remote control apparatus with monitor television, which can solve the problem of the above described prior arts. Another object of the present invention is to provide a remote control system capable of being used more easily. Another object of the present invention is to provide a remote control system being cheaper. These objects are achieved by a remote control apparatus according to claim 1 and by an electronic equipment control system according to claim 4. The dependent claims are related to further advantageous aspects of the present invention. In a case where the monitor television is connected to the electronic equipment such as a video camera or a camcorder by the signal line and the control signal line, the electronic equipment is remotely controlled by the wire control means, and it becomes possible to monitor the video signal by the monitor television. In contrast, when the electronic equipment is not connected to the monitor television, the electronic equipment can be remotely controlled by the infrared ray or the electronic wave. In accordance with the present invention, if the electronic equipment and the remote control apparatus are connected to each other through the signal line and control signal line, it becomes possible to remotely control the electronic equipment by means of the wire control means and to remotely monitor the video signal on the monitor television of the remote control apparatus and, if the both are not connected to each other, it becomes possible to remotely control the electronic equipment by means of the wireless control means. In addition, even though both of the wire control means and the wireless control means which have the same purpose are utilized, no erroneous operation occurs. Therefore, it is possible to provide a remote control apparatus with monitor television which can be used more easily and is cheaper. The above described objects and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a functional block diagram showing a state of a first embodiment in accordance with the present invention; Figure 2 is a block diagram showing a detecting circuit of Figure 1 embodiment; Figure 3 is a flow chart showing an operation of an operating portion of the first embodiment; Figure 4 is a functional block diagram showing another state of the first embodiment; Figure 5 is an illustrative view showing data format of a control signal used by a wire-control and a wireless-control in the first embodiment; Figure 6 is a functional block diagram showing a state of a second embodiment in accordance with the present invention; Figure 7 is a functional block diagram showing another state of the second embodiment; and Figure 8 is a block diagram showing a control circuit and associated portions of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Figure 1 is a functional block diagram showing a state where a remote control apparatus with monitor television according to a first embodiment of the present invention is connected to a camcorder that is an example of an electronic equipment. In Figure 1, the reference numeral 1 denotes a camcorder which includes a video camera 2 having an optical lens, an image sensing device and a signal processing circuit, a microphone 3, a VTR 4, and an electronic view finder 5. A video signal from the video camera 2 and a sound signal from the microphone 3 are recorded on a video tape (not shown) by the VTR 4. A video signal from the VTR 4, that is, a video signal reproduced by the VTR 4 or a video signal directly supplied by the video camera 2 is amplified by a video output circuit 6, and then, not only displayed on the electronic view finder 5 but also supplied to a terminal 7b. On the other hand, a sound signal from the VTR 4, that is, a sound signal reproduced by the VTR 4 or a sound signal directly supplied from the microphone 3 is amplified by a sound output circuit 8, and then, supplied to a terminal 7c. In addition, the reference numeral 9 denotes an electric power source device which supplies an electric power to respective portions of the camcorder 1 and a terminal 7a. Furthermore, the reference numeral 10 denotes a control circuit which includes a microcomputer, for example, and receives a control signal supplied from a terminal 7d or an infrared ray control signal that is received by an infrared ray sensor 11, and controls respective portions of the camcorder 1, that is, a switch 12 and etc. in response to the control signal. In addition, the reference numeral 21 denotes a rotation table which is provided at a bottom portion of the camcorder 1 as an accessory therefor so as to change a direction toward which the camcorder 1 is oriented. The rotation table 21 includes an infrared ray sensor 22 which receives an infrared ray control signal, a motor 23 for rotating the camcorder 1, and a motor driver 24 for driving the motor 23 in accordance with a control signal from the infrared ray sensor 22. A remote control apparatus 31 includes a monitor television 32 which is constructed by a liquid-crystal panel, for example, a speaker 33 and an operating portion 34. The operating portion 34 includes keys 34a for entering a remote control command, and a microcomputer 34b which receives the remote control command and generates a control signal in accordance with the command. In addition, the reference numeral 35 denotes an electric power source circuit, the reference numeral 36 denotes a video processing circuit, the reference numeral 37 denotes a sound amplifier, the reference numeral 38 denotes a display driver for driving the monitor television 32, the reference numeral 39 denotes a detection circuit for detecting that the video signal is supplied from the camcorder 1 to a terminal 40b, the reference numeral 41 denotes a battery which supplies an electric power to the operating portion 34, and the reference numeral 42 denotes an infrared ray emitting device which converts the control signal generated by the microcomputer 34b of the operating portion 34 into an infrared ray control signal. In addition, the above described detecting circuit 39 can be constructed as shown in Figure 2. More specifically, the detecting circuit 39 includes an AM detector 39a for demodulating a video signal which is sent from the camcorder 1 through the terminal 7b, a video signal line 50b included in a cable 50, and a terminal 40b. A demodulated signal from the AM detector 39a is supplied to a level detector 39b in which it is determined whether a level of the demodulated signal exceeds a predetermined threshold level. Therefore, the level detector 39b outputs a detection signal representing that the video signal is supplied from the camcorder 1, that is, that the camcorder 1 and the remote control apparatus 31 are connected to each other when the level of the demodulated signal exceeds the threshold level. Next, an operation of the first embodiment in a case where the remote control apparatus 31 and the camcorder 1 are connected to each other by the cable 50 will be described. As shown in Figure 1, the cable 50 includes a power source line 50a, the above described video signal line 50b, and a sound signal line 50c which respectively supplies an electric power, a video signal, a sound signal to the remote control apparatus 31 from the camcorder 1, and further includes a control signal line 50d which supplies a control signal to the camcorder 1 from the remote control apparatus 31. More specifically, the electric power line 50a connects the electric power source device 9 of the camcorder 1 and the electric power source circuit 35 of the remote control apparatus 31. The electric power source circuit 35 supplies an electric power that is supplied by the electric power source device 9 to respective portions of the remote control apparatus 31 except for the operating portion 34 while the electric power is converted into values required for the respective portions. Furthermore, as described above, the video signal from the video output circuit 6 is inputted to the video processing circuit 36 and the detecting circuit 39 of the remote control apparatus 31 through the video signal line 50b. A video signal outputted from the video processing circuit 36 is converted into a display signal for driving the monitor television 32 by the display driver. Then, the video signal is displayed as an image on the monitor television 32. Furthermore, the sound signal from the sound output circuit 8 is inputted to the sound amplifier 37 of the remote control apparatus 31 through the sound signal line 50c and amplified therein to be monitored by the speaker 33. Therefore, it is possible to monitor an image and a sound directly outputted from the video camera 2 and the microphone 3 of the camcorder 1, or a video signal and a sound signal which are reproduced by the VTR 4, at a place separated from the camcorder 1. On the other hand, the control signal from the operating portion 34 of the remote control apparatus 31 is inputted to the control circuit 10 of the camcorder 1 through the control signal line 50d, and therefore, respective portions of the camcorder 1 can be controlled by the control circuit 10. Furthermore, if it is detected that the video signal is supplied from the camcorder 1 to the remote control apparatus 31, that is, that the camcorder 1 and the remote control apparatus 31 are connected to each other by the video signal line 50b and the control signal line 50d by the detecting circuit 39, a function for controlling the camcorder 1 out of functions of a wireless control means by the infrared ray emitting device 42 which is provided in association with the operating portion 34 is stopped, and therefore, no infrared ray is emitted by the infrared ray emitting device 42. This is objected to prevent erroneous operation of the control circuit 10 of the camcorder 1 due to the interference of the control signal from the infrared ray emitting device 42 and the control signal from the control signal line 50d. In addition, even if the detection is made by the detecting circuit 39, a function for controlling the rotation table 21 is not stopped. More specifically, as shown in Figure 3, at a first step S1, the microcomputer 34b determines whether a remote control command inputted by the keys 34a is for controlling the camcorder 1 or for controlling the rotation table 21. If it is determined that the remote control command being inputted at that time is for controlling the camcorder 1 in the step S1, the microcomputer 34b determines in accordance with the output signal from the above described detecting circuit 39 whether or not the connection of the camcorder 1 and the remote control apparatus 31 via the cable 50 is detected, in a step S2. If "NO" is determined in the step S1 and "YES" is determined in the step S2, in a next step S3, the microcomputer 34b outputs a control signal according to the remote control command inputted by the keys 34a to the terminal 40d. Therefore, the control signal from the microcomputer 34b, that is, the operating portion 34 is sent to the control circuit 10 through the control signal line 50d and the terminal 7d. In other words, a wire-control means is made effective. On the other hand, if it is determined that the remote control command inputted by the keys 34a is for controlling the rotation table 21 in the step S1, in a step S4, the infrared ray emitting device 42 is driven by the control signal generated by the microcomputer 34b, that is, the operating portion 34 even if the connection is detected or is not detected by the detecting circuit 39. Therefore, the infrared ray control signal for controlling the rotation table 21 is emitted by the device 42 and received by the infrared ray sensor 22 provided on the rotation table 21, so that the motor 23, that is, the rotation angle of the rotation table 23 can be controlled by the infrared control signal. Furthermore, if the connection is not detected by the detecting circuit 39 in the step S2, that is, the camcorder 1 and the remote control apparatus 31 are not connected to each other through the cable 50, in the above described step S4, the infrared ray emitting device 42 is driven by the control signal from the microcomputer 34b. Therefore, the infrared ray control signal is emitted by the device 42 and received by the infrared sensor 11, so that respective portions of the camcorder 1 can be controlled by the infrared ray control signal. Thus, a wireless control means is made effective when the camcorder 1 and the remote control apparatus 31 are not connected to each other by the cable 50. However, if the both are connected to each other by the cable 50, a function of the wireless control means for controlling the camcorder 1 is stopped while a function of the wireless control means for controlling the rotation table 21 is not stopped. In other words, when the camcorder 1 and the remote control apparatus 31 are connected to each other through the cable 50, a part of functions of the wireless control means is stopped or inhibited. Furthermore, if the control signal is supplied through the control signal line 50d is detected by the control circuit 10, it is determined that the video signal is monitored by the monitor television 32 of the remote control apparatus 31 is performed, and therefore, the control circuit 10 controls the switch 12 such that an electric power supply to the electronic view finder 5 is interrupted. Therefore, unnecessary image display by the electronic view finder 5 is not performed. In the following, an operation of the first embodiment in a case where the camcorder 1 and the remote control apparatus 31 are not connected to each other by the cable 50 will be described with referring to a functional block diagram of Figure 4. As seen from Figure 4, because the cable 50 does not exist, no electric power, no video signal, and no sound signal are supplied from the camcorder 1 to the remote control apparatus 31, and therefore, each of the video processing circuit 36, the sound amplifier 37 and the display driver 38 does not operate, and accordingly, the monitor of the video signal by utilizing the monitor television 32 and the monitor of the sound signal by utilizing the speaker 33 cannot be made. However, an electric power is supplied to the operating portion 34 by the battery 41. In this case, the detection circuit 39 does not detect the connection of the camcorder 1 and the remote control apparatus 31, and therefore, all the functions of the wireless control means by utilizing the infrared ray emitting device 42 can be performed. Therefore, both of the camcorder 1 and the rotation table 21 become able to be controlled by the wireless control means. In addition, the same signal format is adapted by both the wire control means and the wireless control means in the control circuit 10. More specifically, the control signal which is supplied from the operating portion 34 of the remote control apparatus 31 through the control signal line 50d and the control signal which is supplied through the infrared ray emitting device 42 have the same signal format as shown in Figure 5, and therefore, it is intended to simplify the circuit structure. More specifically, both the wire control signal and the wireless control signal have the signal format shown in Figure 5(A). The signal includes a leader code of 13.5 milliseconds, for example, a custom code of 8 bits, an inverted custom code of 8 bits, a data code of 8 bits, and an inverted data code of 8 bits. The leader code is for notifying that the leader code is followed by the control signal including the custom code and the data code to the control circuit 10 of the camcorder 1. The custom code is utilized for identifying manufacturers and kinds of the electronic equipment to be controlled. That is, it is possible to identify that the equipment to be controlled is a camcorder of Sanyo Electric Co., Ltd., for example. The data code is used for identify an operation of the electric equipment to be controlled. By the data code, it is possible to command the content of the operation of the camcorder 1, for example, "Play", "Stop", "Record", "Feed Forward", "Rewinding", and etc. At the first time, the control signal as shown in Figure 5(B) or Figure 5(C) is sent to the control circuit 10; however, if one of the keys 34a is continued to be depressed, at the second time and thereafter, the control signal as shown in Figure 5(D) for indicating that the control signal of the first time is to be repeated is sent to the control circuit 10. In addition, if an infrared ray is utilized as the wireless control means, a carrier signal shown in Figure 5(E) is included in the infrared ray control signal such that an influence due to a disturbance light can be eliminated; however, if the control signal is sent via the control signal line 50d, no carrier signal is utilized. Next, a remote control system which is a second embodiment of the present invention will be described with referring to functional block diagrams shown in Figure 6 to Figure 8. In the second embodiment, descriptions similar to or the same as that of the portions of the first embodiment will be omitted here. Figure 6 embodiment is different from Figure 1 embodiment in points that the detection circuit 39 for detecting that the video signal is supplied to the terminal 40b of the remote control apparatus 31 is not provided, that a connection detecting line 50e is provided in the cable 50, the terminal 7e of the camcorder 1 to which the connection detecting line 50e is connected is connected to the control circuit 10, and that the terminal 40e of the remote control apparatus 31 is connected to the ground. More specifically, as shown in Figure 6, when the camcorder 1 and the remote control apparatus 31 are connected to each other by the cable 50, the terminal 7e is connected to the ground through the connection detecting line 50e and the terminal 40e. The control circuit 10 determines that the camcorder 1 and the remote control apparatus 31 are connected to each other through the video signal line 50b and the control signal line 50d when the terminal 7e is connected to the ground, and then, the control circuit 10 does not receive an input of the control signal from the infrared ray sensor 11. Therefore, the control circuit 10 operates in accordance with the control signal that is inputted through the control signal line 50d, and therefore, no erroneous operation due to the interference of the wireless control signal from the infrared ray emitting device 42 and the wire control signal from the control signal line 50d occurs in the control circuit 10. On the other hand, as shown in Figure 7, when the camcorder 1 and the remote control apparatus 31 are not connected to each other by the cable 50, no control signal from the control signal line 50d is inputted to the control circuit 10. However, the terminal 7e is not connected to the ground, and therefore, the control circuit 10 receives an input of the control signal from the infrared ray sensor 11. Therefore, it becomes possible to remote-control the camcorder 1 by utilizing the infrared ray. More specifically, as shown in Figure 8, between an electric power source Vcc and the infrared sensor, a switch 11a is inserted, and the switch 11a is turned-on or off by the signal level at the terminal 7e. If the camcorder 1 and the remote control signal are connected to each other by the cable 50 as shown in Figure 6, the terminal 7e is connected to the ground through the connection detecting line 50e and the terminal 40e, and therefore, the switch 11a is turned-off because the level at the terminal 7e becomes a low level. Accordingly, the infrared ray sensor 11 is disabled, and no wireless control signal from the infrared ray sensor 11 is inputted to the control circuit 10. In contrast, as shown in Figure 7, the both are not connected to each other by the cable 50, the level at the terminal 7e becomes a high level, and therefore, the infrared ray sensor 11 is enable, and thus, the wireless control signal is inputted to the control circuit 10 while no wire control signal is inputted to the control circuit 10 because no control signal is applied through the control signal line 50d to be terminal 7d. The embodiments according to the present invention were described in the above; however, it is needless to say that as the wireless control means, an electronic wave may be utilized instead of the infrared ray. In addition, an electronic equipment to be controlled by the remote control apparatus may be an arbitrary equipment including portions to be remote-controlled and a video signal generating means such as a video camera, a television set, a video recording reproducing apparatus, and etc. Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the scope of the present invention being limited only by the terms of the appended claims.

Claims: A remote control apparatus comprising: a television monitor (32) capable of displaying an image according to a video signal received from a first piece of electronic equipment (1) through a video signal line (50b), said first piece of electronic equipment (1) including video signal generating means (2) for generating said video signal and first operation control means (10) for controlling an operation of said first piece of electronic equipment (1) in response to a first control signal; an operating portion (34) for receiving an inputted control command and for generating said first control signal and a second control signal; wire control means adapted to apply said first control signal to said operation control means (10) of said first electronic equipment (1) by means utilizing an electronic signal through a control signal line; wireless control means (42) adapted to apply said first control signal to said operation control means (10) of said first electronic equipment (1) by means utilizing an infrared ray or an electromagnetic radio frequency wave; and to apply said second control signal to a second piece of electronic equipment (21); said second piece of electronic equipment (21) includes second operation control means (24) for controlling the operation of said second piece of electronic equipment (21) in response to said second control signal; connection detecting means (39) adapted to detect that said remote control apparatus and said first piece of electronic equipment (1) are connected through said control signal line (50d) and said video signal line based on the supply of the video signal generated in said first piece of electronic equipment (1) to the remote control apparatus; function stopping means (34) adapted to inhibit at least the function of said wireless control means (42) of controlling the first piece of electronic equipment (1) when said connection is detected by said connection detecting means (39); and characterized in that said function stopping means (34) does not inhibit the function of said wireless control means of applying said second control signal to said second piece of electronic equipment. A remote control apparatus according to claim 1, wherein said first electronic equipment (1) includes a video camera (2) for generating a first video signal, said video camera (2) being controlled by said first operation control means (10) in response to said first control signal, and said second electronic equipment (21) includes an attachment for acting on said video camera (2), said attachment being controlled by said second control means (24) in response to said second control signal. A remote control apparatus according to claim 2, wherein said first electronic equipment (1) further includes a video recording/reproducing unit (4, 5) for recording said first video signal on a recording medium and for reproducing said recording medium to generate a second video signal, one of said first video signal and said second signal being sent to said remote control apparatus through said video signal line (50b). An electronic equipment control system comprising: a television monitor (32) capable of monitoring a video signal received from a first piece of electronic equipment (1) through a signal line (50b); an operating portion (34) for receiving an inputted control command and for generating a first control signal and a second control signal; wire control means adapted to control said first piece of electronic equipment (1) by means of said first control signal utilizing an electronic signal through a control signal line (50d); wireless control means adapted to control said first piece of electronic equipment (1) by means of said first control signal utilizing an infrared ray or an electromagnetic radio frequency wave and for applying a second control signal for controlling a second piece of electronic equipment (21); connection detecting means adapted to detect connection of said remote television monitor (32) and said first piece of electronic equipment (1) through said signal line (50b) and said control signal line (50d); and function stopping means adapted to inhibit at least the function of said wireless control means of controlling the first piece of electronic equipment (1) when said connection is detected by said connection detecting means; characterized in that said function stopping means does not inhibit the function of said wireless control means of applying said second control signal to said second piece of electronic equipment.

Inventors: TABUCHI JUNICHIRO, TABUCHI, JUNICHIRO
Applicants: SANYO ELECTRIC CO, SANYO ELECTRIC CO., LTD.
Application year: 1993
Main classification: H04N5
IPC codes: H04N5, H04N7