JPH05137044A - Radio transmission and reception circuit of video camera, from which view finder is separated - Google Patents

Abstract

PURPOSE: To obtain the radio transmission reception circuit adopted for a video camera where its body section and a view finder are separately operated. CONSTITUTION: A timing control section 60 applied to a radio transmission circuit inserts an encoding signal to a video signal for a prescribed horizontal synchronizing signal period. On the other hand, a timing control section 140 applied to a radio reception circuit extracts the video signal in which a secret code is encoded and gives the resulting signal to a decoder 152. The signal decoded by the decoder 152 is discriminated by a reference code signal and a code discrimination device 153, and only when the codes are identical, the received signal is displayed on a view finder 172. Thus, an image is picked up while the video camera body and the view finder are separated at a location where the image is hardly picked up or there is any spatial restriction and an encryption code is easily set so as to avoid crosstalk from a video signal received from other radio video camera.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera in which a viewfinder is separated from a main body, and more particularly to a wireless transmission / reception circuit used in a video camera in which the main body of the video camera and the viewfinder operate separately.

[0002]

2. Description of the Related Art Generally, a viewfinder of a video camera (camcorder) has a structure which is integrally connected to a main body of the video camera and is held in a housing, or a viewfinder of Lerner. Fourth, 54
Like the separate type video camera described in No. 1,698, the viewfinder is configured to be attached to a part of the user's body in a state where the viewfinder is separated from the main body of the video camera and connected by wire. There is. However, since this is a wired system, there is a problem in that it is inconvenient for the user to use the video camera because of spatial limitation when shooting underwater or in one corner.

Also, Hawthorne, US Pat.
No. 2,436 mentions a radio receiver / transmitter device capable of wirelessly communicating between a separate viewfinder and the body of a video camera, but for a technique for processing a video signal without interference. Is not listed.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to provide a video camera constructed so that the main body of the video camera and the viewfinder are separated so as to operate wirelessly. It is an object of the present invention to provide a wireless transmission circuit and a wireless reception circuit for use in a main body and a viewfinder respectively.

Another object of the present invention is to apply a digital coding signal set by a user to a video signal by applying a coding technique to prevent interference of a motion signal between video cameras configured to operate wirelessly. (EN) A wireless transmission circuit that superimposes and transmits the signal and a wireless reception circuit that receives a video signal only when this digital coding signal is the same as the value stored in the viewfinder section.

[0006]

In order to achieve the above-mentioned object, the present invention comprises a viewfinder section separated from the main body of the video camera, and the lens section of the video camera installed on the main body side of the video camera. A CCD unit for converting the image signal of the subject input through the to an electric video signal, a pre-processing unit for receiving the electric signal and performing automatic white balance adjustment, automatic black balance adjustment, flare correction and gamma correction, and A video signal processing unit which receives a pre-processed signal, separates it into a luminance signal and a color difference signal, and processes the processed signal to output a composite video signal; A sync signal separating unit for separating, an encryption means for encoding a code set by a user through a keypad, A timing control unit that receives a signal output from the encryption unit and superimposes the encrypted signal on a predetermined horizontal synchronization signal section in the horizontal synchronization signal separated by the synchronization signal separation unit; Mixer unit for mixing the mixed signal with the video signal from the video signal processing unit, a modulator for receiving the mixed signal from the mixer unit and modulating with a carrier of a specific frequency, and a video signal modulated by the modulator. A wireless transmission circuit of a video camera main body, in which a viewfinder is separated, includes a transmission unit that wirelessly transmits the signal to the viewfinder unit through a transmission antenna after amplification by the amplifier.

In order to achieve another object of the present invention,
A viewfinder section is separated from the main body of the video camera, and a receiving section that receives a composite video signal wirelessly transmitted from the main body of the video camera to the viewfinder section of the video camera through a receiving antenna,
A demodulation unit that amplifies and detects a reception signal from the reception unit,
A video signal processing unit for processing the detected composite video signal from the demodulation unit, a synchronization signal separation unit for separating the composite video signal into vertical and horizontal synchronization signals, and a horizontal synchronization separated by the synchronization signal separation unit. A timing control unit for extracting an encrypted signal superimposed on a predetermined horizontal synchronization signal section in the signal, a decoding unit for comparing and reading a signal obtained by decoding the encrypted signal from the timing control unit and a code set by a user through a keypad, A gate unit for turning on / off the video signal from the video signal processing unit according to a signal from the decoding unit, and a video signal received from the gate unit for amplification and synchronization separation, and then displaying the video signal on the viewfinder screen. Provided is a wireless transmission circuit of a video camera main body, in which a viewfinder including a display unit is separated.

[0008]

The wireless transmission / reception circuit of a video camera with a separate viewfinder according to the present invention is applied to a normal video camera, and the video camera body and the viewfinder are separated in a place where it is difficult to take an image or where space is restricted. Not only can the image be picked up, but the user can easily set the encryption code through the keypad so as not to interfere with a video signal input from another wireless video camera.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction and operation of a wireless transmission / reception circuit of a video camera having a separate viewfinder according to the present invention will be described in detail with reference to the accompanying drawings.

According to FIG. 1, the reflected light from the subject passes through the camera lens section A of the video camera, and the light entering the camera lens section A at this time is not shown, but the auto focus drive section and the automatic squeeze drive section. And adjusted by the shutter part,
It is converted into an electric video signal by the CCD unit 10 which is an image pickup device. The converted output signal is output to the preprocessing unit 20.
Is subjected to auto white balance adjustment, auto black balance adjustment, flare correction and gamma correction, sent to the video signal processing unit 30, separated into a luminance signal and a color difference signal, processed, and then output again as a video signal containing a composite sync signal. To be done. The video signal processed in this way can be sent directly to the VCR deck B together with the composite sync signal for recording or reproduction. At this time, although the audio signal is not shown,
It is also added to the VCR deck B through the microphone and recorded. The above-mentioned video signal processing technique used in the present invention is already known, and therefore detailed description thereof will be omitted.

Hereinafter, a detailed description will be given of a process of wirelessly transmitting and receiving the video signal from the main body of the video camera to the screen of the viewfinder in the video camera in which the viewfinder is separated, which constitutes the subject of the present invention.

The video signal supplied from the video signal processing unit 30 is sent to a sync signal separating unit 40 and is supplied to a timing control unit 60 for separating vertical and horizontal sync signals. On the other hand, the user can input a desired secret number from the code generators 51 including the keypad in the encryption means 50 through the numeric keys 0 to 9 and other function keys. As a result, the code generator 51 generates a digital signal corresponding to the input secret number. This digital signal is input to the encoder unit 52, encoded, and supplied to the timing control unit 60. The encoder unit 5
Reference numeral 2 is a 10-to-4 bit encoder for converting any number from 0 to 9 of the code generator 51 into 4-bit digital data.

In the timing control unit 60, the digital data signal from the encryption means 50 is entered in the horizontal sync signal section corresponding to 10H to 13H within the character signal superposition period in the horizontal sync signal separated by the sync signal separation unit 40. Is superposed on each other to make each horizontal synchronizing pulse high when the reference pulse is abnormal, and low when it is less than the reference pulse.

The signal superposed by the timing control unit 60 is supplied to the mixer unit 70 together with the video signal from which the sync signal which is the output signal of the video signal processing unit 30 is not separated. These two signals are mixed in the mixer section 70 and then supplied to the modulation section 80. The mixed signal is supplied to the modulator 80.
It is modulated by the modulator 82 by the carrier of the specific frequency by the carrier oscillator 81 inside. The modulator 82 uses a parallel modulator or another amplitude modulator. The video signal thus modulated by the modulator 80 is amplified by the amplifier 91 constituting the transmitter 90, transmitted through the transmitter 92 and the transmission antenna 93, and finally wirelessly received by the viewfinder.

According to FIG. 2, the transmission signal wirelessly transmitted by the transmitter 90 of the wireless transmission circuit adopted in the main body of the video camera is received by the reception antenna 101 and the reception antenna 101 of the wireless reception circuit adopted in the viewfinder of the video camera. The signal is received by the receiving unit 100 including the device 102.

The signal received from the receiver 100 is amplified by the amplifier 111 and supplied to the demodulator 110 for detection by the detector 112.

The video signal detected by the demodulation section 110 is sent to the video signal processing section 120 for processing. The specific demodulator used here determines whether the type of the detector used as the detector 112 is a synchronous detector or an asynchronous detector.

The composite video signal processed by the video signal processor 120 is separated from the vertical and horizontal sync signals applied to the sync signal separator 130, and the separated horizontal and vertical sync signals are timing-controlled together with the composite video signal. Part 1
40 is input.

The timing control unit 140 extracts the 4-bit digital signal included in the horizontal synchronizing signal of 10H to 13H within the character signal superimposing period of the first field from the horizontal synchronizing signal and sends it to the decoding means 150.

On the other hand, the timing control section 140 extracts the 4-bit digital signal carried on the horizontal synchronizing signal and sends it to the decoding means 150. The timing controller 140 operates in the second field of the horizontal sync signal 273H to 27H.
The 4-bit digital signal carried on the 6H horizontal sync signal is extracted. The 4-bit digital signal extracted in this way is sent to the decoder section 152 in the decoding means 150 and is compared and read by the code reader 153 with the secret code generated from the code generator 151 including the keypad on the viewfinder side. In this way, when the secret code from the result code generator 151 and the signal from the decoder unit 152 which are decoded and read by the decoding unit 150 match, a high signal is output to the gate unit 160 to output the video signal processing unit 120. The video signal supplied to the gate section is sent to the display section 170 for display. At this time, the display unit 170 receives the video signal from the gate unit 160, amplifies the video signal, and separates the sync signal.
And an electronic viewfinder (EVF) 172.

However, when the secret code from the code generator 151 and the signal from the decoder unit 152 do not match, a low signal is input to the gate unit 160 and the video signal supplied by the video signal processing unit 120 is the gate unit 160. Therefore, the electronic viewfinder section 172 does not display an image.

The operation of the wireless transmission / reception circuit of the video camera having the separate viewfinder having the above-described structure will be described below.

3A to 3E are waveform diagrams for explaining the encoding operation of the wireless transmission circuit of the video camera in which the viewfinder is separated according to the present invention. FIG. 5 is a waveform diagram showing a vertical sync signal, a delayed sync acting on a gate pulse, and a waveform-converted sync signal, a separated horizontal sync pulse, and an encoded horizontal sync pulse.

First, the present invention uses a part of the horizontal synchronizing signal section separated by the synchronizing signal separating section 40 shown in FIG. 1. According to FIG. 3A, the TV broadcasting signal is 525 pieces per frame. It has a scan line, and is divided into two fields and scanned for one frame. At this time, the 1H to 3H sections and the 7H to 9H sections of the first field indicate equalization pulses (T1 and T3), respectively, and the 4H to 6H sections indicate the vertical synchronization pulse section T2.

The section T5 in which the data such as the character multiplex signal can be superimposed is from 10H to 20H. In the following second field, the section in which the character signal can be superimposed is from 273H to 2
Up to 83H.

Therefore, as shown in FIG. 3A, the equalization pulse period (T1) 3H and the vertical synchronization signal pulse period (T2) 3H are included in the vertical blanking period in the signal for one field of the TV broadcast signal. , The equalizing pulse period (T3) 3H, the character signal superimposing period (T5) 10H to 20H, and the remaining video signal period. In the 2nd field, the vertical blanking start point is 0 from this field due to timing.
Delayed by 5 H. That is, it starts at 263H.

According to the present invention, the timing control unit 60 of the wireless transmission circuit shown in FIG. 1 uses the signal period T4 from 10H to 13H during the character signal superposition period T5 to perform the encryption means 50.
2 is superimposed on the signal, and the timing control unit 140 of the wireless reception circuit shown in FIG. 2 extracts the data placed in this section T4 and decodes it, and then the secret code set by the decoding means 150 in FIG. Whether or not a match is found is checked, and a screen is displayed on the EVF 172 only when a match is found. This is a secret number reading function to prevent radio interference by reading the secret number.

On the other hand, the vertical and horizontal synchronizing signals separated by the synchronizing signal separating section 40 of FIG. 1 are input to the timing control section 60, which is shown in B of FIG. 3 and C of FIG. As described above, the vertical synchronizing signal is delayed by 6H to be a gate pulse signal whose pulse width is increased from 3H to 4H, and only the 10H to 13H portions of the video signal input to the timing control unit 60 are extracted.

Then, a key signal is generated from a code generator 51 including a keypad in the encryption means 50 of FIG. 1 and input to the encoder section 52. This encoder unit 52 has 10
-To-4 bit encoder, where the secret code is a parallel 4-bit digital signal and the timing control unit 6
0 is supplied. In response to the 4-bit digital signal composed of the combination of "1" and "0" input to the timing control unit 60, the horizontal synchronizing signal extracted in 1H units to the most significant bit MSB in the least significant bit LSB. Medium 10
The pulse width from H to 13H is increased or left unchanged. At this time, as shown in D of FIG. 3 and E of FIG. 3, when the 4-bit digital signal is “1”, the pulse width of the 10H to 13H horizontal synchronizing signal is increased, and when it is “0”, the pulse width is unchanged. Then, the signal is output as a pulse amplitude modulated (PAM) signal.

As shown in FIG. 1, the PAM signal is mixed with the video signal in the mixer section 70, then modulated by the parallel modulation section 80 or the AM modulation section, amplified by the transmission section 90, and transmitted to the viewfinder section by the transmission antenna 93. Sent.

Next, the receiving section 1 on the viewfinder side
At 00, the electric wave transmitted from the video camera body is received through the receiving antenna 101. This receiver uses a fixed reception tuner so that it is tuned to a constant frequency.

As shown in FIG. 2, the signal received by the receiver 100 is demodulated and detected by the demodulator 110,
The signal passed through the demodulation unit 110 is processed by the video signal processing unit 120.
And the same synchronization signal separation unit 130 in the transmission circuit after processing
Then, the signal is separated into vertical and horizontal synchronizing signals through and input to the timing controller 140.

In this timing control unit 140, the vertical synchronizing signal is delayed by 6H and made into a gate pulse whose width is increased to 4H as in the timing control unit 60 in the wireless transmission circuit on the video camera main body side, and the timing control unit 140 is made to operate. The horizontal synchronizing signal in the 10H to 13H section is extracted from the input horizontal synchronizing signal.

The horizontal synchronizing signal thus extracted is supplied to the decoder section 152 in the decoding means 150 shown in FIG.
In the decoder unit 152, a voltage at an intermediate point between the level of "1" and the level of "0" in the level of the horizontal synchronizing signal of 10H to 13H is set as the detection reference voltage, and then the logic level encoded on the T4 section is set. To detect. At this time, if the level of the horizontal synchronizing signal is higher than the set reference voltage level, it is detected as "1", and if it is smaller, it is detected as "0", and the encoding sequence from the LSB to the MSB on the transmitting circuit side of the video camera body is the same. It is converted back into a 10-bit digital signal and sent to the code reader 153.

On the other hand, in the code generator 151 including the keypad in the decoding means 150, if the user inputs the same secret code as the one pressed at the time of reception, a 10-bit digital signal is input to the code reader 153.

Therefore, the code reader 153 reads the identity of the secret code signal input by the user and the encrypted signal carried on the video signal, and if the two signals match, a coincidence confirmation signal, that is, a high signal is given. It is supplied to the gate unit 160, and the gate unit 160 sends a video signal, that is, a TV video signal to the EVF 172 in accordance with the coincidence signal to display it on the screen.

If the two signals do not match, the gate section 160 shuts off the video signal, and automatically prevents interference of video signals input from another wireless video camera.

Next, the internal structure of the timing control unit employed in the transmission / reception circuit of the present invention is as follows.

FIGS. 4 and 5 are detailed block diagrams of the timing controller employed in FIGS. 1 and 2, respectively.

According to FIG. 4, the vertical synchronizing signal 141 and the horizontal synchronizing signal 142 separated by the synchronizing signal separating unit 130 are input to the A / D converter 143 and the counter 144, respectively. At this time, the horizontal synchronizing signal includes an equalizing pulse, and two equalizing pulses are input to the counter 144 as one horizontal synchronizing signal and counted. One output of the counter 144 provides the clock signal CLK to the A / D converter 143 to sample the vertical synchronizing signal input to the A / D converter 143 and convert the digital signal into a digital signal. Address signal ADDR supplied from the counter 144 output to 145
Is stored in the designated address of the memory unit 145 allocated by.

On the other hand, the other output of the counter 144 is sent to the read / write control logic section 146, which writes the signal in the section from 1H to 6H and reads from 7H, but the output of this read / write control logic section 146. Is sent to the memory section 145 and read by the read signal the vertical synchronization data written by the write signal to read the D / A converter 14
Send to 7. In this case, from the counter 144 to the memory unit 1
It is possible to directly output a high signal from 1H to 6H and a low signal from 7H to 45.

Next, the vertical synchronizing signal input to the D / A converter 147 is the clock signal C from the counter 144.
It receives LK and is converted into an analog signal.

The analog-converted vertical synchronizing signal is delayed by a monostable multivibrator (M / M) 148 with a width of 4H and applied to one terminal of the gate circuit 149.

This gate circuit 149 generates a gate pulse having a waveform shown in C of FIG. 3, and this gate pulse is inverted by the inverter 250 and supplied to the AND gate 251.

This AND gate 251 is an inverter 25.
The output signal of 0 and the video signal are received, and the video signal of 10H to 13H in the horizontal synchronizing signal is output as shown in D of FIG.

The video signals of 10H to 13H are added to the output of the encryption means 50 by the adder 252, and the mixer 70 converts the video signal carrying the encryption information of the waveform shown in E of FIG.
Supply to.

According to FIG. 5, the timing controller 140 applied to the radio receiving circuit is very similar in structure and operation to the timing controller 60 applied to the radio transmitting circuit. However, in the timing control unit 140 of the wireless reception circuit, the output of the AND gate 251 'is directly transmitted to the decoding unit 150, so that the horizontal synchronization signal in the section of 10H to 13H in which the code is placed is used as the reference code signal. The feature is that the code is discriminated. This comparison / determination result is supplied to the gating unit 160 of FIG. 2 to gate the video signal.

Next, as shown in FIG. 6, the detailed structure of the encryption means 50 adopted in FIG. 1 showing the wireless transmission circuit of the present invention will be described.

The encryption means 50 employed in FIG. 1 of the present invention comprises a code generator 51 and an encoder section 52.

According to FIG. 6, the key signal pressed by the user on the keypad of the code generator 51 of the transmitting circuit in the video camera body is a 10-bit digital signal, which is the encoder section 52 including the logic circuit. Is converted to 4 bits.

The converted digits are synchronized with the horizontal synchronizing signals 10H to 13H, pass through the AND gates, respectively, and when they are high, the DC bias circuit causes DC.
The voltage is output and the horizontal sync signal 10H is output by each adder.
Through 13H are added and supplied to the timing controller 60.

In this timing control section 60, the encrypted signal from the encryption means 50 is placed on the horizontal synchronizing signals 10H to 13H of the video signal.

On the other hand, the decoder section 15 which constitutes the decoding means 150 of the viewfinder side radio receiving circuit of the present invention.
2 and the configuration and operation of the code generator 151 are very similar to the case of the encryption unit 50 of the wireless transmission circuit described above, and thus detailed description thereof will be omitted.

Further, the code generator, the decoder unit, the encoder unit, the code reader and the timing control unit adopted in the wireless transmission / reception circuit constituting the present invention are controlled by software built in the microcomputer 2 as shown in FIG. Can perform the same function.

FIG. 7 schematically shows the structure of the wireless transmission circuit of the present invention using the microcomputer 2.

According to FIG. 7, the key input from the keyboard 1 causes the microcomputer 2 to change the horizontal synchronizing signal from 10H to 13H.
The encoding signal P2 is added to the H section, and the vertical synchronizing signal is used as the gate pulse P1 in synchronization with the horizontal synchronizing signal. This vertical synchronizing signal is gated with the TV video signal through the gate element 4. The gating signal is added to the horizontal synchronizing signal added with the encoding signal by the adder 5, modulated and amplified by the modulator 6 and the amplifier 7 by the modulator 9, and transmitted through the transmitting antenna 8 by the transmitter.

The detailed configuration of the present invention using the microcomputer as described above and the operation explanation through the flow charts are omitted, but it can be said to be comprehensively included in the scope of the present invention.

[0058]

As described above, the wireless transmission / reception circuit of a video camera with a separated viewfinder according to the present invention is applied to a normal video camera, and is used in a place where it is difficult to take an image or where there is a spatial restriction. Not only can an image be taken while the video camera body and the viewfinder are separated, but also a user can easily set an encryption code through the keypad so as not to interfere with a video signal input from another wireless video camera.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing a wireless transmission circuit employed in a main body of a video camera according to the present invention.

FIG. 2 is a configuration block diagram showing a wireless reception circuit adopted in a viewfinder of a video camera according to the present invention.

3A to 3E are waveform diagrams for explaining an encoding operation of a wireless transmission circuit of a video camera with a separated viewfinder according to the present invention, each of which is a signal showing a part of a TV broadcast signal and separated. FIG. 7 is a waveform diagram showing a vertical sync signal, a delay and waveform-converted sync signal acting as a gate pulse, a separated horizontal sync pulse, and an encoded horizontal sync pulse.

FIG. 4 is a detailed block diagram of a timing control unit adopted in FIGS.

FIG. 5 is a detailed configuration block diagram of a timing control unit adopted in FIG.

FIG. 6 is a detailed circuit diagram of the encryption means adopted in FIG.

FIG. 7 is a configuration diagram showing another embodiment in which a receiving circuit of the wireless viewfinder of the present invention is embodied by using a microcomputer.

[Explanation of Codes] 10 CCD Unit 20 Pre-Processing Unit 30, 120 Video Signal Processing Unit 40, 130 Synchronous Signal Separation Unit 50 Cryptographic Means 60, 140 Timing Control Unit 70 Mixer Unit 80 Modulator 90 Transmitter 100 Receiver 110 Demodulator 141, 141 'Vertical sync signal 142, 142' Horizontal sync signal 143, 143 'A / D converter 144, 144' Counter 145, 145 'Memory section 146, 146' Read / write control logic section 147, 147 'D / A converter 148, 148 'multivibrator 150 decoding means 160 gate section 170 display section 250, 250' inverter A camera lens section B VCR deck section

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 5/225 F 9187-5C B 9187-5C

Claims (7)

[Claims] 1. A CC for converting an image signal of a subject inputted through a lens of a video camera into an electrical signal.
D part and auto white balance adjustment by receiving this electrical signal,
A pre-processing unit for automatic black balance adjustment, flare correction and gamma correction, a video signal processing unit for receiving a pre-processed signal and processing a luminance / color signal, and then outputting a composite video signal, and the video signal processing unit A sync signal separating unit that separates the video signal output from the device into vertical and horizontal sync signals, an encryption unit that encodes a code set by a user through a keypad, and the encryption signal that receives the signal output from the encryption unit. A timing control unit that superimposes on a predetermined horizontal synchronization signal section in the horizontal synchronization signal separated by the synchronization signal separation unit, and mixes the superimposed signal from the timing control unit and the video signal from the video signal processing unit. And a modulation unit that receives a mixed signal from the mixer unit and modulates the mixed signal with a carrier of a specific frequency, A wireless transmission circuit of a video camera main unit, in which a viewfinder is separated, including a transmission unit for amplifying a modulated video signal from the modulation unit with an amplifier and wirelessly transmitting the amplified video signal to the viewfinder through a transmission antenna. 2. The timing control unit receives a horizontal synchronizing signal separated by the synchronizing signal separating unit, counts and outputs the counter, and receives a clock signal from the counter to separate the synchronizing signal separating unit. A / D converter for converting an analog vertical synchronizing signal into a digital signal, a memory section for storing the digitally converted signal at an address designated by an address signal from the counter, and a read by the output from the counter. A read / write control logic unit that sends a write / write logic signal to the memory unit to read / write the vertical synchronization signal stored in the memory unit; and a read from the memory unit according to a control signal of the read / write control logic unit. / Write the written digital vertical synchronizing signal to the clock signal from the counter. D / A converter for converting into an analog signal according to the above, a monostable multivibrator for delaying the analog-converted vertical synchronizing signal from the D / A converter by a predetermined width, an output from the counter and the multivibrator A gate circuit that gates the output from the gate circuit and passes only a predetermined horizontal synchronizing signal, and an AND gate that receives the inversion signal of the output of the gate circuit and the video signal, performs a logical product, and outputs the logical result. 2. The wireless transmission circuit of a viewfinder-separated video camera according to claim 1, further comprising an adder for adding the horizontal synchronizing signal output from the AND gate and the output signal of the encoder unit. 3. The code generator generates a secret code by a number from 0 to 9 input by a user through a keypad, and encodes the secret code from the code generator to the timing controller. The wireless transmission circuit of a video camera with a separated viewfinder according to claim 1, wherein the wireless transmission circuit comprises a supply encoder unit. 4. A receiver configured to separate a viewfinder from a main body of the video camera and applied to a viewfinder side of the video camera to receive a signal wirelessly transmitted from the main body of the video camera through an antenna, the receiving unit. A demodulation unit that amplifies and detects a signal received from the unit, a video signal processing unit that processes the detected video signal from the demodulation unit, and a synchronization signal separation unit that separates the video signal into vertical and horizontal synchronization signals A timing control unit for extracting a cryptographic signal superimposed on a predetermined horizontal sync signal section separated by the sync signal separating unit; a signal obtained by decoding the cryptographic signal from the timing control unit and set by a user through a keypad. Decoding means for comparing and reading codes, and the video signal processing section according to the signal from the decoding means Of a video camera separated from the viewfinder including a gate unit for turning on / off the video signal from the display unit, and a display unit for displaying the video signal on the screen of the electronic viewfinder after receiving the video signal from the gate unit and amplifying and separating the signals. Radio receiver circuit. 5. The timing control unit counts and outputs a horizontal synchronizing signal separated by the synchronizing signal separating unit and outputs a counter, and receives a clock signal from the counter to separate the synchronizing signal separating unit. An A / D converter for converting an analog vertical synchronizing signal into a digital signal, a memory section for storing the digitally converted signal at an address designated by an address signal from the counter, and a read / write operation by the output from the counter. A read / write control logic unit that sends a logic signal to the memory to read / write the vertical synchronization signal stored in the memory unit; and a read / write from the memory unit according to a control signal of the read / write control logic unit. The digital vertical sync signal according to the clock signal from the counter. A D / A converter for analog conversion, a monostable multivibrator for delaying the analog-converted vertical synchronizing signal from the D / A converter by a predetermined width, one output from the counter and an output from the multivibrator. A gate circuit that gates only a predetermined horizontal synchronizing signal to pass through; and an AND gate that receives the inverted signal of the output of the gate circuit and the video signal, logically ANDs them, and outputs the logical result. The wireless receiving circuit of a video camera with a separated viewfinder according to claim 4. 6. The decoding means is mounted on a code generator for generating a secret code by a number from 0 to 9 input by a user through a keypad, and on a horizontal synchronizing signal of a video signal output from the timing controller. A decoding unit that decodes the encrypted code, and a code interpretation that receives the output from the code generator and the output from the decoder unit to compare and interpret whether both output signals are the same and to transmit to the gate unit. 5. The wireless receiving circuit for a video camera with a separated viewfinder according to claim 4, wherein the wireless receiving circuit comprises a receiver. 7. A CCD unit configured to separate a viewfinder from a main body of the video camera and converting an image signal of a subject input through the lens of the video camera into the main body of the video camera into an electrical signal. Auto white balance adjustment by receiving this electrical signal,
A pre-processing unit for auto black balance adjustment, flare correction and gamma correction, and a luminance / color signal processing that receives the pre-processed signal,
A video signal processing unit for outputting a composite video signal; a sync signal separating unit for separating the video signal processing unit into vertical and horizontal sync signals; an encryption unit for encoding a code set by a user through a keypad; A timing control unit that receives the signal output from the superimposing unit and superimposes the encrypted signal on a predetermined horizontal synchronizing signal section in the horizontal synchronizing signal separated by the synchronizing signal separating unit; and the superimposed signal from the timing controlling unit. A mixer section that mixes the video signals from the video signal processing section, a modulator section that receives the mixed signals from the mixer section and modulates with a carrier of a specific frequency, and a video signal that has been modulated from the modulator section is amplified by an amplifier. A wireless transmission circuit including a transmission unit that wirelessly transmits to the viewfinder through a rear transmission antenna A receiving unit that receives a signal wirelessly transmitted from the main body of the video camera to a viewfinder side of the video camera through a receiving antenna, a demodulating unit that amplifies and detects a signal received from the receiving unit, and a demodulating unit from the demodulating unit. A video signal processing unit that processes the detected video signal, a sync signal separation unit that separates the video signal into vertical and horizontal sync signals, and a predetermined horizontal sync signal section that is separated by the sync signal separation unit. A timing control unit for extracting an encrypted signal, a decoding unit for comparing and reading a signal obtained by decoding the encrypted signal from the timing control unit and a code set by a user through a keypad, and the video according to the signal from the decoding unit. A gate unit that turns on and off the video signal from the signal processing unit, and receives the video signal from this gate unit. A video camera with a separated viewfinder, comprising a wireless reception circuit configured by a display unit for displaying a video signal on the screen of the viewfinder after amplifying and synchronously separating.