JPH04119076A - Audio signal-video signal transmitter-receiver - Google Patents

Abstract

PURPOSE:To transmit and receive a light signal by providing both a camera integrated type video tape recorder and a repeater with opening parts respectively, and arranging light transmitting and receiving means so as to face these opening parts, and making the above-mentioned opening parts face each other. CONSTITUTION:A light signal demodulation circuit 7 is arranged in the inside of the repeater 1 so as to face the opening 4, and the circuit 7 receives the light signal, and demodulates an A/V signal from the light signal, and sends this demodulated A/V signal to a television receiver 3 and a video deck 14 through an A/V signal transmission cable 13. Then, a magnetic recording part 11 to convert an image-picked up picture and a sound into a video signal and an audio signal and record them on a magnetic tape and a light signal modulation circuit 12 to generate a light modulated signal based on the A/V signal from the recording part 11 are provided in the inside of the camera integrated type video tape recorder 2. Thus, the camera integrated type video tape recorder and the repeater can be optically so that the light signal can be transmitted and received.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a camera-integrated videotape recorder and an audio signal/video signal (hereinafter abbreviated as A/V signal).
An A/V equipped with a relay device for relaying A/V signals between it and an A/V signal input/output device that can input
This invention relates to improvements in signal transmitting and receiving devices.

[Prior Art] Recently, with the miniaturization of cameras and video tape recorders, camera-integrated video tape recorders that integrate a camera and a video tape recorder have been actively developed.

By the way, the camera-integrated video tape recorder can be used in various ways by connecting the camera-integrated video tape recorder to an A/V signal input/output device such as a television receiver, video deck, or audio device. I can do it.

FIG. 6 is a diagram showing a connection between a conventional camera-integrated video tape recorder and an A/V signal input/output device.

Of these, Figure 6 (A) shows the connection between the camera-integrated videotape recorder and the television receiver;
(b) and (c) are diagrams in which a camera-integrated video tape recorder and a television receiver are connected through a video deck. A method of using the camera-integrated video tape recorder will be explained with reference to the same figure.

(1) When displaying the image recorded on the camera-integrated video tape recorder 71 on the television receiver 72, as shown in FIG. 6(a), the camera-integrated video tape recorder 71 and the television receiver 72 are connected by an audio signal transmission cable 73a and a video signal transmission cable 73b. In the following description, the cables 73a and 73b will simply be referred to as A/V signal transmission cables. By connecting as described above, the A/V signal recorded in advance on the camera-integrated video tape recorder 71 is applied to the television receiver 72 via the A/V signal transmission cable 3.

(2) As shown in FIG. 6(B), when the video deck 74 is connected to the television receiver 72, the camera-integrated video tape recorder 71 and the video deck 74 are connected using an A/V signal transmission cable. Connect the top 3. In this way, images recorded on the camera-integrated video tape recorder 71 are provided to the television receiver 72 through the video deck 74. In this connection state, by using the video deck 74 for recording, it is also possible to dub the A/V signal from the camera-integrated video tape recorder 71.

(3) Also, a camera-integrated videotape recorder 71
Editing can be performed by using the video deck 74 for playback and the video deck 74 for recording.

(4) As shown in Figure 6 (c), the video deck 74
By using the camera-integrated video tape recorder 71 for recording and the camera-integrated video tape recorder 71 for playback, the A/V signal from the video deck 73 can be recorded on the camera-integrated video tape recorder 71 (referred to as external recording). .

(5) In addition to the usage methods shown in (1) to (4) above, there is also a so-called superimposition method in which an image from a character generator is provided to the camera-integrated video tape recorder 71. There is also a method of recording the audio signal from the audio signal on the camera-integrated video tape recorder 71.

FIG. 7 is a diagram showing an example in which a camera-integrated video tape recorder 71, a television receiver 72, a video deck 74, and an audio device 75 are connected together. Referring to the same figure, the number (1) attached to the A/V signal transmission cable
-(5) show the paths through which A/V signals flow in the various usage methods described above.

In this way, by connecting the A/V signal transmission cable, the various usage methods shown in (1) to (5) above can be realized all at once.

[Problems to be Solved by the Invention] However, with the connection method shown in FIGS. 6 and 7, when it is desired to view images shot by a camera-integrated video tape recorder, A/V signal transmission is required each time. There is a problem in that it is necessary to connect cables, which is complicated. Further, when a plurality of A/V signal input/output devices are combined, there is a possibility that the A/V signal transmission cable is erroneously connected to a terminal different from the desired terminal.

This invention was made in view of the above problems, and
/ Eliminates the complexity of connecting V signal transmission cables,
Another object of the present invention is to provide an A/V signal transmission device that makes it possible to prevent erroneous connections.

[Means for Solving the Problems] An A/V signal transmission device according to the present invention for achieving the above object includes a camera-integrated video tape recorder that integrates a video tape recorder and a camera, and an audio signal/video signal transmission device. An audio signal/video signal input/output device comprising an audio signal/video signal input/output device capable of inputting or outputting signals, and a relay device connected between a camera-integrated video tape recorder and the audio signal/video signal input/output device. The video signal transmitting/receiving device includes a first optical signal transmitting/receiving means for transmitting/receiving an optical signal portion modulated based on an audio signal/video signal, The means is arranged to face an opening provided in the main body case of the camera-integrated video tape recorder, and the relay device connects the camera-integrated video tape recorder with an optical signal modulated based on the audio signal and the video signal. It has a second optical signal transmitting/receiving means for transmitting and receiving, and this second transmitting/receiving means is arranged facing the opening provided in the main body case of the relay device, and is arranged to face the opening provided in the main body case of the relay device, and is connected to the opening of the camera-integrated video tape recorder. The relay device is characterized in that the openings are provided at positions corresponding to each other.

[Function] In the present invention described above, the camera-integrated video tape recorder and the relay device each have an opening, and the optical transmitting/receiving means is disposed facing the opening, so that the openings can be made to correspond to each other. This allows optical signals to be transmitted and received. As a result, A/V signals can be transmitted and received between the A/V signal input/output device and the camera-integrated video tape recorder without using an A/V signal transmission cable.

[Embodiment] FIG. 1 is a mounting diagram showing an embodiment of an A/V signal transmitting/receiving device according to the present invention. In the same figure, A/
The V signal transmission device includes a camera-integrated video tape recorder 2 and a relay device 1 installed indoors and equipped with the camera-integrated video tape recorder 2. A television receiver 3 and a video deck 14 are connected to the relay device 1.
They are connected by a V signal transmission cable 13. The upper surface of the exterior case of the relay device 1 is provided with an opening 4, a detection protrusion 5 for determining the mounting position of the camera-integrated video tape recorder 2, and a shutter 6 for opening and closing the opening 4. There is. Moreover, inside the relay device 1,
An optical signal demodulation circuit 7 is arranged facing the aperture 4.

This optical signal demodulation circuit 7 receives the optical signal and converts the optical signal into
Demodulate the /V signal and convert the demodulated A/V signal into an A/V signal.
The signal is sent to the television receiver 3 and video deck 14 through the signal transmission cable 13.

The camera-integrated video tape recorder 2 is provided with an opening 8 on the bottom surface of its exterior case, a shutter 9 for opening and closing the opening 8, and a 5WIO for detecting pressure when it is fitted to the relay device 1. The opening 8 is provided at a position corresponding to the opening 4 of the relay device 1, and the detection SWIO is provided at a position corresponding to the detection protrusion 5 of the relay device 1.

Inside the camera-integrated video tape recorder 2, there is a magnetic recording section 1 for converting captured images and audio into video signals and audio signals and recording them on magnetic tape.
1, and an optical signal modulation circuit 12 that generates an optical modulation signal based on the A/V signal from the magnetic recording section 11. Note that 5' and 10' are power supply connection terminals, which are contacted when the camera-integrated VTR 2 is mounted on the relay device 1 and supply DC voltage generated within the relay device 1 as a power source.

FIG. 2 is a diagram showing a state in which the camera-integrated video tape recorder 2 is not mounted on the relay device 1. In the figure, the shutter 6 of the relay device 1 and the shutter 9 of the camera-integrated video tape recorder 2 are structured to open and close in conjunction with the detection 5WIO and the detection protrusion 5, and slide to open and close the opening 4 and the opening 8. is covered. By covering the openings 4 and 8 in this manner, it is possible to prevent optical signal transmission loss due to external dust or the like.

Note that the shutters 6 and 9 may be automatically slid by another method. In this case, a photodetector (not shown) is attached to each of the detection protrusion 5 of the relay device 1 and the detection 5WIO of the camera-integrated video tape recorder 2, and light from the outside due to the removal of the camera-integrated video tape recorder 2 is removed. The shutters 6 and 9 may be slid in response to the photodetection signal.

FIG. 3 is a block diagram showing the demodulation circuit and modulation circuit of FIGS. 1 and 2. FIG. Of these, FIG. 3(a) shows an example in which the brightness modulation method is adopted, and FIG. 3(b) shows an example in which the frequency modulation method is adopted.

Referring to FIG. 3(a), the video signal Vin is given to the LED driver 30, which causes the LED driver 30 to
Drives ED31. As a result, the LED 31 outputs a light signal with a light emission intensity proportional to the amplitude of the video signal. L.E.
The optical signal from the DI is sent to the photodetector 3 of the relay device 1.
2, the light is received and converted into an electrical signal. This converted electrical signal is amplified by an amplifier 33, and the amplified signal is corrected by an equalizer circuit 34. This corrected signal is sent to the television receiver 3 as a video signal. Note that in the case of the brightness modulation method, an optical signal modulation circuit and an optical signal demodulation circuit are added to transmit and receive audio signals.

In the frequency modulation method shown in FIG. 3(b), the video signal and audio signal are transmitted to FM modulation circuits 36 and 37, respectively.
The video signal and audio signal which have been FM modulated by FFv1 and which have been FFv1 modulated are mixed by a mixing circuit 38. The mixed A/V signal is given to the LED driver 39, and the LED driver 39 controls the LED 4 according to the A/V signal.
0 to cause the LED 40 to emit light. The optical signal generated by the LED 40 is received by the photocoupler 41 of the relay device 1, where it is converted into an electrical signal, and the optical signal is sent to the amplifier 42.
is amplified by The amplified signal is A/
It is converted into a V signal.

This frequency modulation method has an advantage over the brightness modulation method in that it can suppress the generation of noise due to dust or the like entering the aperture.

In the embodiment shown in FIG. 1, the opening 4 is provided on the top surface of the relay device and the opening 8 is provided on the bottom surface of the camera-integrated videotape recorder 2. It may also be provided on the side of the body type video tape recorder 2.

FIG. 4 is a block diagram of the total system in the brightness modulation method. Here, for the sake of simplicity, A/V signal transmission is summarized in one line. Referring to the figure, this embodiment and A/V
In the signal transmitting/receiving device, the relay device 1 and the camera-integrated video tape recorder 2 each have an optical signal demodulation circuit and an optical signal modulation circuit shown in FIG.
is connected to the television receiver 3, video deck 14, and audio device 15, and includes a first changeover switch 21 having two changeover contacts a, b and one common contact therein, and changeover contacts a, b, c and a second changeover switch 22 having one common contact.

The operation of the A/V signal transmitting/receiving device shown in FIG. 4 will be explained.

(1) When viewing the reproduced image from the camera-integrated video tape recorder 2 on the television receiver 3, turn the contact of the first changeover switch 21 to the b side.

By doing so, the camera-integrated video tape recorder 2 and the relay device 1 are optically coupled, and the A/V signal from the camera-integrated video tape recorder 2 is given to the television receiver 3 through the first changeover switch 21.

(2) A from camera-integrated videotape recorder 2
The case where the /V signal is dubbed by the video deck 14 will be explained. The input terminal of the video deck 14 is connected to the relay device 1
The A/V signal from the camera-integrated video tape recorder 2 is always supplied to the video deck 14. Therefore, by putting the video deck 14 into the recording state, dubbing can be performed.

(3) A case in which an A/V signal is supplied from the video deck 14 to the camera-integrated video tape recorder 2 (in the case of external recording) will be explained. In this case, the contact of the second changeover switch 22 is turned to the C side.

By doing this, the A/V signal from the video deck 14 is passed through the second changeover switch 22 to the LED driver 5.
6 and whose brightness is modulated by the LED driver 56 is applied to the camera-integrated video tape recorder 2. The camera-integrated videotape recorder 2 receives an optical signal using a photocoupler 58 and converts it into an electrical signal. This converted electrical signal is corrected by an amplifier 59 and an equalizer 60, and the corrected A/V signal is sent to the magnetic recording circuit 11 of the camera-integrated video camera 2 and recorded on the head.

(4) A case will be described in which an audio signal is provided from the audio device 15 to the camera-integrated video tape recorder 2. That is, this is a case where an external audio signal is dubbed to the camera-integrated video tape recorder 2. In this case, the contact of the second changeover switch 22 is turned to the b side. By doing so, the audio signal is provided to the LED driver 56 through the second changeover switch 22. Then, the audio signal is transmitted through the path shown in (3) above and recorded on the camera-integrated video tape recorder.

(5) A case in which an A/V signal is given from the television receiver 3 to the camera-integrated video tape recorder 2 (in the case of TV recording) will be explained. In this case, the contact of the second changeover switch 22 is turned to the a side. By doing this, the A/V signal from the television receiver 3 is given to the LED driver 56 through the second changeover switch 2, the A/V signal is transmitted through the path shown in (3) above, and the A/V signal is sent to the camera. Recorded on a body video tape recorder.

(6) A case in which an A/V signal is supplied from the video deck 14 to the television receiver 3 will be explained. That is, this is a case where the reproduced images from the deck are viewed on the TV 3 without using the camera-integrated video tape recorder 2. In this case, the contact of the first changeover switch is turned to the a side. By doing this, the A/V signal from the video deck 14 is applied to the television receiver through the first changeover switch 21.

The relay devices of the embodiments shown in FIGS. 1 to 4 are placed indoors and are constantly connected to the television receiver 5 and video deck, and there is no need to remove the cable 13.

Furthermore, when taking pictures outside using the camera-integrated video tape recorder, it is only necessary to remove the camera-integrated video tape recorder from the relay device 1, and there is no need to remove the A/V cable. Similarly, when you return home after taking pictures, you can simply place the camera-integrated video tape recorder on the relay device and enjoy the reproduced images.

In the fourth example, optical signals are used for transmission and reception, as well as for both video and audio signals, but in order to avoid interference during transmission and reception, the modulation frequency is different between the transmitter and receiver. You may change it.

Specifically, one of the transmitting side and the receiving side is set to a frequency in the near-infrared region, and the other is set to a frequency in the infrared region.

In addition, in the fourth example, the brightness modulation method shown in FIG. 3(a) is adopted, but instead of this brightness modulation method, the frequency modulation method shown in FIG. 3(b) is used. You may.

Furthermore, the signal audio device 1 from the video deck 14
Although the signal from the video tape recorder 5 and the signal from the television receiver 3 are switched by a changeover switch, these signals may be mixed and supplied to the video tape recorder 2.

Moreover, a plurality of optical modulation circuits and an optical signal demodulation circuit are provided without providing the changeover switches 21 and 22, and the television receiver 3 and the video deck 14 are connected to the plurality of circuits, respectively.
, audio device 15 may be connected.

FIG. 5 shows a third improved embodiment. In this figure, the difference from the embodiments shown in FIGS. 1 to 4 is that an input jack 61 and an output jack 62 are provided for electrical connection to a television receiver or the like. If the camera-integrated video tape recorder 2 has the configuration shown in FIG. 5 above, it can be connected to a television receiver or the like using the input jack 61 and output jack 62 even when the relay device 1 is not available, such as when traveling. This allows images captured by the camera-integrated video tape recorder 2 to be displayed.

C Effects of the Invention According to the present invention described above, the camera-integrated video tape recorder and the relay device can be optically coupled to transmit and receive optical signals modulated based on A/V signals. As a result, it is possible to eliminate the trouble of connecting an A/V signal transmission cable between the camera-integrated video tape recorder and the A/V signal input device, and to connect the A/V signal transmission cable to the desired one. It is possible to prevent the terminal from being connected to a different terminal.

[Brief explanation of drawings]

Figure 1 is a mounting diagram showing an embodiment of the A/V signal transmitting/receiving device of the present invention, Figure 2 is a diagram of a camera-integrated video tape recorder removed from a relay device, and Figure 3 (a) is a brightness modulation method. 3(b) is a block diagram of an optical signal modulation circuit and an optical signal demodulation circuit using a frequency modulation method,
FIG. 4 is a block diagram showing a second embodiment of the invention, FIG. 5 is a block diagram showing a third improved embodiment of the invention, and FIGS. 6 and 7 are diagrams showing conventional examples. be. In the figure, 1 is a relay device, 2 is a camera-integrated video tape recorder, 3 is an A/V/; No. 7 television receiver as an input/output device, 4 and 8 are openings, 5 is a detection protrusion, 6 and 8 is a shutter, 7 is an optical signal demodulation circuit,
10 is a switch, 11 is a magnetic recording section, 12 is an optical modulation circuit, 21 is a first changeover switch, and 22 is a second changeover switch.

Claims (1)

[Claims] A camera-integrated video tape recorder that integrates a video tape recorder and a camera, an audio signal/video signal input/output device capable of inputting or outputting audio signals/video signals, and a camera-integrated video tape recorder. An audio signal/video signal transmitting/receiving device comprising a relay device connected between a video tape recorder and an audio signal/video signal input/output device, the camera-integrated video tape recorder transmitting an audio signal/video signal. has a first optical signal transmitting/receiving means for transmitting/receiving an optical signal modulated based on and the relay device has a second optical signal transmitting/receiving means for transmitting and receiving an optical signal modulated based on an audio signal/video signal to and from the camera-integrated video tape recorder, and the second optical signal transmitting/receiving means is arranged facing an opening provided in the main body case of the relay device, and the opening of the camera-integrated video tape recorder and the opening of the relay device are provided at positions corresponding to each other. Signal/video signal transmitting/receiving equipment.