JPH08223011A - Electronic equipment having input and output terminal - Google Patents

Abstract

PURPOSE: To improve the function of an electronic equipment by providing at least two input/output lines which can be switched to an output or input mode in the same connector and then connecting a relative equipment to the electronic equipment. CONSTITUTION: An electronic equipment (1) 11 consists of an input part 13, a switch 14, a video display device 15, a display controller 16, the input/output lines A and B, the input blocks 17 and 19, a connector 21 and a microcomputer 22. An electronic equipment (2) 12 consists of a connector 21', an input terminal 24, a video signal processing means 23 and an output terminal 25. In such a constitution, when the equipment 12 is connected to the equipment 11, the lines A and B are switched between the input and output modes respectively and the equipment 11 secures the function of the equipment 12. As a result, the equipment 11 can add a new function to its original one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having input / output terminals such as a VTR (video tape recorder) with a liquid crystal monitor, a television receiver, a television device with a recording / reproducing function, a projector device and an audio device. More particularly, the present invention relates to an electronic device having an input / output terminal which also serves as an input / output terminal to improve the function of the electronic device.

[0002]

2. Description of the Related Art In recent years, composite type products and multifunctional products have been introduced one after another due to the remarkable development of electronic technology and the increasing needs of users. For example, in video tape recorder-related equipment, a color video printer capable of printing out one frame of a captured video image like a photograph and a video titler capable of synthesizing desired characters and illustrations in the video image have become popular. On the other hand, a camera-integrated VT
A camera-integrated VTR with a liquid crystal monitor in which a liquid crystal monitor is mounted on the R has also been released, and it has become possible to easily confirm the image at the time of shooting and the video image taken. Also,
A video tape recorder-related device and a camera-integrated VTR with a liquid crystal monitor are provided with input / output terminals for connecting them to each other. The present invention relates to an electronic device having an input / output terminal, and is suitable for application to all electronic devices. As an example of the electronic device having an input / output terminal, a VTR with camera integrated with a liquid crystal monitor is provided. I will pick up and explain.

As an example of an electronic device having an input / output terminal of the prior art, a connection example of a video tape recorder-related device will be described with reference to FIG.

In FIG. 5, reference numeral 1 is a camera-integrated VT.
R or a camera-integrated VTR with a liquid crystal monitor, reference numeral 2 indicates a color video printer shown as an example of video-related equipment, and reference numeral 3 is an editing equipment that creates title characters, illustrations and the like and superimposes them on a video image. Refers to a video titler, and reference numeral 4 refers to a liquid crystal monitor or monitor television.

When the video image of the camera-integrated VTR 1 with a liquid crystal monitor is to be printed using the color video printer 2, first, the color video printer 2 is used.
It is necessary to connect the output of the above to the input of the monitor TV 4 to check the operation status. That is, the color video printer 2 is connected to the monitor television 4 to connect the monitor television 4 with various operation settings such as confirmation of an image captured from the camera-integrated VTR 1 with a liquid crystal monitor, print settings, memo printing, and image quality adjustment. This is because it is designed to be done in. Then, after visually observing the monitor television 4 and selecting a desired image displayed on the monitor television 4, the memory setting button of the color video printer 2 is pressed to freeze the image, and the print setting button (neither is displayed). Printing is performed by pressing (not shown).
Furthermore, when adding a desired title, such as "birthday", "athletic meet" and an illustration to the captured video image, the color video printer 2 is connected to the video titler 3 and a predetermined operation is performed to create a composite image. After that, print out.

The camera-integrated VTR 1 with the liquid crystal monitor
Has an input terminal and an output terminal, but it is common to use both the input terminal and the output terminal due to the space saving in the electronic device and the frequency of use. Then, the switching between the input terminal and the output terminal is uniformly switched in response to the operation of the user (user), for example, by operating the electronic switch or the mechanical switch. Therefore, the image of the camera-integrated VTR 1 with a liquid crystal monitor is output to the color video printer 2, the image is captured by the color video printer 2, and then the image is input again to the camera-integrated VTR 1 with a liquid crystal monitor, and the liquid crystal monitor is attached. It is not possible to form a so-called through pass line X for displaying an image on the liquid crystal monitor built in the camera-integrated VTR 1.

[0007]

However, in the above-described electronic device having the input / output terminals of the prior art, the control of the input / output dual-purpose signal terminals is uniformly performed, and if all the inputs are input, all lines are switched to the input. Has been done. for that reason,
To form a through-pass line with other related equipment, it is necessary to install a new terminal in addition to the input / output dual-purpose signal terminal or to increase the number of various connectors, which is not only a disadvantage in mounting. However, there is a problem that the space of the electronic device is wasted. Further, since the number of connectors increases, it takes time to connect the terminals, and it is difficult to easily connect related devices to improve the function of the electronic device.

An object of the present invention is to solve the above-mentioned problems, and to eliminate the wasteful space and the cost increase by providing the input and output terminals separately, and easily connect the related equipment. Thus, an electronic device having an input / output terminal capable of improving the function of the electronic device is provided.

[0009]

In order to solve such a problem, an electronic device having an input / output terminal capable of connecting a second electronic device to the first electronic device via an input / output terminal is provided. The electronic device includes an input unit, a signal output unit such as a video display device or a speaker, a connecting unit such as a connector for connecting the second electronic device, and at least two or more switches that can be switched between input and output. Input / output combined means, device detection means for detecting connection of the second electronic device, signals such as video signals and audio signals input from the input section, and signals input from the input / output combined means. And a control unit for supplying and controlling an input / output switching signal, a device detection signal for the device detection unit, and a switching signal for the switching unit. It was. Further, the second electronic device is provided with connecting means for connecting the first electronic device, an input terminal, a signal processing means for processing an input signal, and an output terminal. Then, when the second electronic device is connected to the first electronic device, the input / output combined means is switched between output and input according to the input terminal and the output terminal of the second electronic device, and is fixed to switch the signal. After being processed by the signal processing means, the signal is input to the first electronic device again and output to the signal output unit.

Further, the above-mentioned signals are video signals or audio signals such as composite video signals, component luminance signals, component color signals and component RGB signals, and the above-mentioned signal processing means are video signal processing means or audio signal processing. It was decided to be a means. Furthermore, if a specific example in which the electronic device having the input / output terminal of the present invention is applied to AV equipment will be described, the first electronic device is a camera-integrated VTR with a liquid crystal monitor, and the second electronic device is a color device. The above problems have been solved as a video printer.

[0011]

That is, in the electronic device having the input / output terminal of the present invention, when the second electronic device is connected to the first electronic device, the input / output means of the first electronic device is changed to the second electronic device. According to the input terminal and the output terminal of the electronic device, the output is switched to the input and fixed, the signal is processed by the signal processing means, and then input to the first electronic device again and output to the signal output unit. . Therefore, only by connecting the second electronic device to the first electronic device, the connection state is detected by the control unit (microcomputer), and the video and audio processing functions not originally possessed by the first electronic device are provided. By utilizing this, the function of the first electronic device can be easily improved.

When a color video printer is connected to the camera-integrated VTR with a liquid crystal monitor, the captured image of the color video printer and the echo sound are confirmed by the liquid crystal monitor and speaker of the camera-integrated VTR with a liquid crystal monitor. Can be easily performed without connecting to another monitor TV or speaker.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an electronic device having an input / output terminal according to the present invention will be described below with reference to FIGS. First, a first embodiment will be described with reference to FIGS.

Embodiment 1 The structure of an electronic device having an input / output terminal according to the present invention will be described with reference to FIG. In FIG. 1, reference numeral 10 indicates an electronic device having an input / output terminal of the present invention. The electronic device 10 provided with the input / output terminal of the present invention is, for example, an electronic device (1) 11 which is a camera integrated VTR with a liquid crystal monitor, and an electronic device (2) which is a related device (accessory) such as a color video printer. ) 12.

The detailed structure of the electronic device (1) 11 is composed of an input section 13 for inputting a video signal from an input circuit section such as a camera image, a reproduced image and a terminal input image through an input switch 13 ', and a switching means. A certain switch 14, a video display device 15 such as a liquid crystal monitor or a cathode ray tube (CRT) which is a signal output part, a display controller 16 which controls the video display device 15, and an input / output means on an extension of the input part 13 ( Hereinafter, simply referred to as "input / output line") A, an output unit (1) reaching the input block 17 and the recording circuit unit (not shown) when the input / output line A is selected as "input".
18. Similarly, when the input / output line B is selected as “input”, the input block 19, the output section (2) 20, the connector 21 as a connecting means of the electronic device (1) 11, and the switch 14 are switched. A control unit for transmitting and receiving a switching signal, an input / output switching signal to the I / O lines A and B in the connector, and a device detection signal for detecting a connected device in the connector 21 (hereinafter,
(Hereinafter simply referred to as "microcomputer") 22.

Similarly, the detailed structure of the electronic device (2) 12 is fixed to "input" by connecting the connector 21 to the connector 21 'which is integrally connected with the connector 21, for example, and the input / output line A. An input terminal 24, a video signal processing means 23 for performing processing such as character insertion and video image memory loading, and an output terminal 25 connected to the I / O line B and fixed to "output". Consists of

The operation of the electronic device having the input / output terminal of the present invention having such a configuration will be described. In FIG. 1, an electronic device (1) 11 such as a camera-integrated VTR with a liquid crystal monitor is
For example, it is provided with two-system input / output lines A and B and a connector 21 in which they are inserted. Then, in the electronic device (1) 11, the electronic device (2) 12 such as an accessory is used.
When is connected, the device detection signal is connected to the ground terminal from the open state and becomes "low level", the device detection signal is detected by the microcomputer 22 and predetermined processing is performed, and the input / output line A is output. An input / output switching signal for fixing the input / output line B to "input" is generated. At this time, the input terminal 24 of the electronic device (2) 12 is in the “input” state, the output terminal 25 is in the “output” state, and the through pass line X via the video signal processing means 23 is formed.

The electronic device (1) 11 has a switch 14
The display controller 16 is provided with a video signal input from the input unit 13 or a video signal selected from one of the processed video signals input from the input / output line B.
Send to. The display controller 16 converts a signal suitable for the video display device 15 in the next stage, for example, a composite video signal into red (R), green (G), and blue (B) component signals. The video display device 15 displays the input video signal. Here, the switch 14 is used as the input / output line B (fixed to “input”) only when the electronic device (2) 12 is connected to the electronic device (1) 11.
To display an image on the image display device 15 via the display controller 16. At the same time, it is output as a monitor output to the output unit (2) 20 via the input block 19.

With the above-described operation, in the electronic device having the input / output terminal of the present invention, only by connecting the electronic device (2) 12 to the electronic device (1) 11, the connection state is detected by the microcomputer 22 and the electronic device (2) 12 is detected. An image processing function not originally possessed by the device (1) 11 is added, and the image can be displayed on the image display device 15 provided in the electronic device (2) 11. for that reason,
The electronic device (2) 12 saves the trouble of selecting the function by connecting to the monitor TV, and the electronic device (1) 11 uses the function of the electronic device (2) 12 through the through path line X. Function can be improved easily.

Next, with reference to FIG. 2, a concrete circuit example of the input / output unit of the electronic device having the input / output terminal of the present invention will be described. The same parts as those in the block diagram of the electronic device having the input / output terminal of the present invention shown in FIG. 1 are designated by the same reference numerals, and the duplicated description will be omitted.

First, the configuration of the circuit example of the input / output unit of the electronic device having the input / output terminal of the present invention will be described. In FIG. 2, the circuit configuration of the input / output unit of the electronic device (1) 11 is connected to the transistor Tr (1) via the resistor R from the input unit 13 to which the video signal is input. Transistor Tr
The collector of (1) is connected to a power supply terminal 26 such as DC5V, the emitter is connected to the input block 17 via a capacitor C, and is connected to the ground terminal 27 via a resistor R, and is a characteristic part of the present invention. It is connected to a certain input / output line A. Among various control signals, the microcomputer 22 inputs an input / output switching signal to a transistor Tr4 which is a transistor with a built-in resistor (generally called a digital transistor), and then supplies it to the electronic device (2) 12 via the resistor R. Further, the device detection signal is pulled up by the resistor R and then supplied to the electronic device (2) 12.

The circuit configuration of the input / output unit of the electronic device (2) 12 is connected to the ground terminal 27 so as to face the device detection signal connected to the microcomputer 22 described above, whereby the electronic device (1) 11 is connected. Is adapted to recognize that the electronic device (2) 12 has been connected. The microcomputer 2 mentioned above
The input / output switching signal, which is the control signal of No. 2, is pulled up by the resistor R and is also input to the transistor Tr3 (digitatra) of the electronic device (2) 12, and the transistor T3.
The collector of r3 is pulled up by the resistor R and pulled down by the resistor R, and then input to the transistor Tr (2). The transistor Tr (2) controls the input / output line A.

The operation of the circuit example of the input / output unit of the electronic device having the input / output terminal of the present invention having such a configuration will be described. The microcomputer 22 generates various control signals according to the state of the device detection signal. For example, when the input / output switching signal generated by the microcomputer 22 outputs "low level", the transistor Tr4 turns "OFF", the transistor Tr3 turns "ON", and the transistor Tr (2) turns "OFF". The output-combined line A is selected as "output".
At that time, the video signal input from the input unit 13 is output to the video signal processing unit 23 from the input / output line A through the transistor Tr (1) and the input terminal unit.
Conversely, when the input / output switching signal outputs “high level”, the transistor Tr4 turns “ON”, the transistor Tr3 turns “OFF”, and the transistor Tr (2)
Becomes "ON", the transistor Tr (1) becomes "OFF" at the same time, and "input" is selected for the input / output line A.

Embodiment 2 This embodiment is an example in which the video signal in the first embodiment is replaced with a composite video signal, a component luminance signal, and a component color signal, which are input, which is shown in FIG. And explain. Hereinafter, the same parts as those in the first embodiment are designated by the same reference numerals, and the description of their configurations and operations will be partially omitted. In particular, the control signals such as the input / output switching signal and the device detection signal are duplicated, and the description thereof will be omitted.

In FIG. 3, reference numeral 30 indicates an electronic device having an input / output terminal of the present invention. The electronic device 30 having the input / output terminal of the present invention is a camera integrated type V with a liquid crystal monitor.
An electronic device (1) 31 such as a TR and an electronic device (2) 32 such as an accelerator such as a color video printer are generally configured. The detailed configuration of the electronic device (1) 31 includes an input unit 33 to which a composite video signal is input from an input circuit unit (not shown), an input unit 34 to which a component luminance signal is input, and a component color signal. Input unit 35, switch 1 as switching means
4. Video display device 1 such as a liquid crystal monitor which is a signal output unit
5, the display controller 16 that controls the video display device 15, the input / output line C existing on the extension of the input unit 33, and the input block 36 (when the input / output line C is selected as “input”) The description of the output section is omitted hereinafter), the input block 37 when the input / output line D is selected as "input", and the input block 38 when the input / output line E is selected as "input". The first electronic device (1) 31 comprises a connector 21 which is a connecting means, and a microcomputer 22 which sends a switch switching signal and the like to the switch 14.

Similarly, the detailed structure of the electronic device (2) 32 is fixed to "input" by being connected to the connector 21 which is, for example, slidably connected to the connector 21 and the input / output line E. An input terminal 39, an input terminal 40 connected to the input / output line D and fixed to "input", an adder 42 for performing addition processing on these.
Image signal processing means 2 for performing image processing of video images, etc.
3, and an output terminal 41 connected to the I / O line C and fixed to "output".

The operation of the electronic device having the input / output terminal of the present invention having such a configuration will be described. In FIG. 3, the microcomputer 22 in the electronic device (1) 31 is the electronic device (1) 31.
When the electronic device (2) 32 and the electronic device (2) 32 are connected by the connectors 21 and 21 ', the electronic device (2) is processed by the above-described processing.
Is detected. Then, the microcomputer 22 immediately fixes the I / O line D and the I / O line E to "output" and fixes the I / O line C to "input". However, regardless of the control of the microcomputer 22,
The above-mentioned transistor Tr (2) in FIG. 2 may be forcibly turned “ON” on the electronic device (2) 12 side to fix the input / output line C to “input”. At this time, the opposing input terminals 39 and 40 of the electronic device (2) 32 are in the “input” state, and the output terminal 41 is in the “output” state.

In the electronic device (2) 32, the component luminance signal and the component color signal are received from the input / output line D and the input / output line E via the input terminals 40 and 39, respectively, and the adder 42 receives them. input. The adder 42 mixes the component luminance signal and the component color signal, and inputs them to the video signal processing means 23 as a composite video signal. As described above, the video signal processing means 23 performs processing such as character insertion and memory loading on the video image, and the output terminal 4
Output from 1.

Further, the electronic device (1) 31 has a switch 14
And a composite video signal which is an input signal or a composite video signal output from the output terminal 41 of the electronic device (2) 32 described above is selected by a switch switching signal and output to the display controller 16. To do. However, the switch 14 in the drawing selects the output signal of the video signal processing means 23 because the electronic device (2) 32 is connected. At the same time, the switch switching signal is also input to the display controller 16, and the circuit state of the display controller 16 is switched from the component video signal processing state to the composite video signal processing state and the image is output to the image display device 15. The image display device 15 displays an image by a predetermined process. Thus, the electronic device (1) of the present invention
In 31, the function such as image processing which is not originally possessed can be easily added and the image can be displayed on the image display device 15 simply by connecting the electronic device (2) 32.

Embodiment 3 This embodiment is an example in which an audio signal is inputted instead of the video signal in the first embodiment, which will be described with reference to FIG.

In FIG. 4, reference numeral 50 indicates an electronic device having the input / output terminal of the present invention. The electronic device 50 provided with the input / output terminal of the present invention is generally composed of an electronic device (1) 51 and an electronic device (2) 52. The internal configuration of the electronic device (1) 51 is not shown, and an input section 53 to which an audio signal from an input circuit section is input, a switch 54 as a switching unit, and an input / output on an extension line of the input section 53. Dual-purpose line F, input block 55 when the dual-purpose input / output line F is selected as "input", the connector 21 as a connecting means, the dual-purpose input / output line G inserted inside the connector 21, and the dual input / output The input block 56 when the line G is selected as "input", the amplifier 57, the speaker 58 which is a signal output unit, and the microcomputer 22 which is a control unit which outputs a switch switching signal to the switch 54.
And so on.

Similarly, the detailed configuration of the electronic device (2) 52 is fixed to "input" by being connected to the connector 21 ', for example, a connector 21' which is integrally connected in a sliding manner, and the input / output combined line F. The output terminal 60 is connected to the input / output line G and fixed to "output", and the like.

Next, the operation of the electronic device having the input / output terminal of the present invention will be described with reference to FIG. In FIG. 4, the microcomputer 22 in the electronic device (1) 51 is the electronic device (1).
When the electronic device (2) 52 and the electronic device (2) 52 are connected by the connectors 21 and 21 ', the insertion of the electronic device (2) is detected by the above process. Then, the microcomputer 22 immediately fixes the input / output line F to "output" and the one input / output line G to "input". However, the control transistor in FIG. 2 described above is forcibly turned “ON” on the electronic device (2) 52 side regardless of the control of the microcomputer 22.
The input / output line G may be fixed to "input" by setting the state. At this time, the input terminal 59 of the electronic device (2) 52 facing the electronic device (1) 51 is in the “input” state, and the output terminal 60 is in the “output” state. Further, the electronic device (2) 52
Then, the audio signal output from the electronic device (1) 51 is received via the input terminal 59 and input to the audio signal processing means 61. The audio signal processing means 61 captures an audio signal and adds an electronic echo to it, or a DSP (D
digital signal processor) or the like to digitally operate to add a sense of sound field and output from the output terminal 60.

The electronic device (1) 51 has a switch 54.
And outputs either the audio signal which is the input signal or the processed audio signal passing through the I / O line G to the amplifier 57. However, this electronic device (2)
In this state where 42 is connected, the switch 54 selects the I / O line G side. The amplifier 57 power-amplifies the input signal from the input / output line G and sends it to the speaker 58 or headphones (not shown). The speaker 58 or headphones outputs the amplified audio signal. The actual operation of the electronic device (1) 51 is stereo, but the constituent elements are illustrated as monaural for simplification. To describe a specific example of the case where the present embodiment is applied to an AV device, for example, a portable mini disk MD player or the like is connected to an audio device equipped with a speaker, and recording / reproducing is performed to generate a true stereo sound. Applications such as auditioning are also possible. Further, it goes without saying that the present embodiment can be applied as a video / audio function improving system in combination with the first and second embodiments. As described above, in the electronic device (1) 51 of the present invention, only by connecting the electronic device (2) 52, it is possible to easily add an audio signal processing function which is not originally possessed and improve the function. Further, the processed sound can be output to a speaker or headphones (not shown) provided in the electronic device (1) 51.

The present invention is not limited to the above embodiments, and various embodiments can be adopted. For example, in the present embodiment, the camera-integrated VTR with a liquid crystal monitor has been described, but it goes without saying that it can be applied to other AV equipment, for example, a monitor-integrated digital video disk DVD and a video CD which are expected to be released in the future. . Needless to say, the present invention can be developed into various forms without being limited to the above-described embodiment.

[0036]

As described above, according to the electronic device having the input / output terminal of the present invention, the input / output line is provided in the same connector, and the input / output of the input / output line is performed by the device detection means. Since the switching is automatically performed, it is possible to connect a related device to the electronic device and add a function that the electronic device originally does not have, and it is possible to easily improve the function of the electronic device.

If the present invention is applied to the camera-integrated VTR with a liquid crystal monitor according to the sixth aspect, the accessory (peripheral device) is simply connected to the camera-integrated VTR with a liquid crystal monitor to connect with other peripheral devices. By forming the through-pass line, it is possible to improve the features such as the processing function of the video signal and the audio signal. When an editing device or a color video printer is connected to the camera-integrated VTR with a liquid crystal monitor, the video image captured by the color video printer can be checked on the liquid crystal monitor or speaker of the camera-integrated VTR with a liquid crystal monitor and the editing device can be used. It is possible to easily confirm the processed image, echo sound, etc. without connecting to another monitor TV or speaker.

[Brief description of drawings]

FIG. 1 is a first electronic device having an input / output terminal according to the present invention.
It is a block diagram showing an example of.

FIG. 2 is a circuit diagram showing a specific example of an input / output unit of an electronic device having an input / output terminal of the present invention.

FIG. 3 is a second electronic device having an input / output terminal according to the present invention.
It is a block diagram showing an example of.

FIG. 4 is a third electronic device having an input / output terminal according to the present invention.
It is a block diagram showing an example of.

FIG. 5 is a connection diagram for explaining an electronic device having an input / output terminal according to the related art.

[Explanation of symbols]

 10.30.50 Electronic device equipped with input / output terminals of the present invention 11.31.51 Electronic device (1) 12.32.52 Electronic device (2) 13.33.34.35.53 Input section 14.54 Switch 15 Video display device 16 Display controller 17.19.36.37. 38.55.56 Input block 18 Output section (1) 20 Output section (2) 21.21 'Connector 22 Microcomputer 23 Video signal processing means 24.39.40.59 Input terminal 25.41.60 Output terminal 26 Power supply terminal 27 Ground terminal 42 Adder 57 Amplifier 58 Speaker 61 Audio signal processing means ABCDEFG Input / output line X Through path line Video signal switch switching signal Input / output switching signal Device detection signal Composite video signal Component luminance signal Component color signal

Claims (6)

[Claims] 1. An electronic device comprising an input / output terminal capable of connecting a second electronic device to the first electronic device via an input / output terminal, wherein the first electronic device has an input section, A signal output unit, a connecting unit for connecting the second electronic device, at least two or more input / output unit capable of switching between input and output, and connection of the second electronic device. Device detecting means for detecting, switching means for switching between the signal from the input section and the signal inputted from the input / output means, and an input / output switching signal for the input / output means, and a device for the device detection means A control unit that supplies and controls a detection signal and a switching signal to the switching unit, and the second electronic device includes a connecting unit that connects the first electronic device, and an input terminal. , The input A signal processing means for processing a signal input from a terminal, and an output terminal, and when the second electronic device is connected to the first electronic device, the input / output means is used as the input terminal, According to the output terminal, each of the output and input is switched and fixed, and after the signal is processed by the signal processing means, the signal is input again to the first electronic device and output to the signal output unit. An electronic device with input / output terminals. 2. The signal is at least one of a video signal and an audio signal.
An electronic device provided with the input / output terminal according to. 3. The input / output terminal according to claim 2, wherein the video signal is at least one of a composite video signal, a component luminance signal, a component color signal, and a component RGB signal. Electronic device. 4. The electronic device having an input / output terminal according to claim 1, wherein the signal processing unit is at least one of a video signal processing unit and an audio signal processing unit. 5. The electronic device having an input / output terminal according to claim 1, wherein the signal output unit is at least one of a video display device and a speaker. 6. The camera according to claim 1, wherein the first electronic device is a camera-integrated VTR with a liquid crystal monitor, and the second electronic device is an editing device or a color video printer. An electronic device equipped with the input and output terminals.