JPS60203080A - Wireless video tape recorder - Google Patents

Abstract

PURPOSE:To display the state of operation of a VTR from the camera side wirelessly and to enable the reproduction monitor of the VTR by providing a wireless transmitter and a wireless receiver in a video camera and a video tape recorder VTR respectively. CONSTITUTION:The wireless transmitter and wireless receiver are provided in the video camera and VTR respectively. When recording a picture, reproduction signals and operation signals, i.e. video signals, voice signals and remote control signals, are modulated to TV waves by wireless, ultrasonic wave, etc. by an RF converter incorporated in the camera and the wireless transmitter made up of a power amplifier, and sent to the VTR. The VTR develops them to video signals, voice signals and operation signals necessary for picture recording by a built-in receiver and operates the VTR. When reproducing, remote control signals are modulated by operation of the video camera side, and a transmitter incorporated in the VTR is operated, and TV waves are modulated by reproduced video signals, voice signals and remote control signals and sent to the camera side. The camera side develops them to video signals, voice signals and operation signals necessary for reproduction by the built-in receiver.

Description

[Detailed Description of the Invention] When using a conventionally known video camera and VTR connected with a cable, it is necessary to frequently attach and detach the cable, and it is difficult to operate both the camera and the VTR at separate locations. There were also disadvantages due to cable attachment, such as restrictions on camera movement range.

The present invention eliminates the above-mentioned drawbacks and provides a solution for video cameras and VTRs.
Remove the cable that connects the
In order to make the 'I' R function the same as a housed one, and to be compact and lightweight, the camera and VTR are connected by radio, ultrasonic television radio waves, remote control signals, etc. The present invention relates to a wireless VTR that enables all operations of the VTR to be performed by operating the camera, and also allows the camera to display the operating status of the VTR and monitor playback of the VTR.

In order to achieve the above object, the present invention is constructed as shown in the embodiments below.

In the wireless VTR of the present invention, the video camera and the V'rR are provided with a wireless transmitter and a wireless receiver shown in FIGS. 1 and 2, respectively, and when recording, the RF converter built into the video camera A radio transmitter consisting of a power amplifier and a power amplifier modulates the video signal, audio signal, and remote control signal, which are the reproduction signal and operation signal of the VTR, in a format similar to television radio waves, and transmits the modulated signals to the VTR. A receiver built into the device converts the signals into video signals, audio signals, and operation signals necessary for recording, and operates the VTR. During playback, the remote control signal is modulated by operation on the video camera side, and the signal activates the transmitter built in the V'l'' 17, and the video that is the playback signal and operation signal of the VTR is transmitted. The signals, audio signals, and remote control signals are modulated into radio waves in a format similar to television radio waves and sent to the video camera.At this time, the receiver built into the video camera receives the video and audio signals necessary for playback. and is developed into an operation signal (operation status display signal).

Furthermore, the wireless V'l'R of the present invention can also be connected by a conventionally known video camera and VTR cable.

FIG. 3 is a diagram showing the principle of the remote control signal generator.

The oscillator O8C is an original oscillation circuit for generating key signals for operating various parts using a clock pulse generator. The key signal is the divided output of the binary counter BC,
When the original oscillation frequency is set to 4096Hz, for example, 1024.512.256.128.64.
32 Hz is extracted and used as the operation signal for the video camera and V''TR.

Generally, the operation signals of a VTR are recording A, playback B, rewind C1 fast forward D, pause E, and power OFF F, and the aforementioned frequencies were applied as follows. Recording A...
1024Hz, playback B...512 [121 rewind
C...256H2, fast forward D...128Hz, pause E...64Hz, power OFF F...32
11z, and the confirmation time of the signal is set to 1/4 second so that the delay time due to the operation signal is not a problem, but in reality it may not be possible to generate all the pulses, so it is set as 1024 + 256 4096 = 0.31 seconds, These operation signals are used as the remote control input of the radio transmitter shown in FIG. 1 and the remote control output of the radio receiver shown in FIG.

FIG. 1 is a block diagram of a radio transmitter, which differs from a conventionally known RF converter in pulse modulation of a remote control signal and small RF power wave emission.

The video signal uses a clamp circuit to fix the DC potential at the tip of the synchronization signal, and an amplitude modulator to amplitude modulate the audio signal.
After pre-emphasis, the signal is frequency modulated at a center frequency of 4.5 MHz and frequency converted by a frequency converter. here,
Since the first and second channels are used, when set to the first channel, the frequency modulated wave is centered at 97.75 MHz. For the remote control signal, a clamp circuit fixes the potential at the tip of the key signal, limits the amplitude, and pulse-modulates a signal with a frequency obtained by dividing the clock pulse at a frequency that is, for example, 5 MHz higher than the frequency of the video carrier wave. Ru.

FIG. 4 shows the output signal of the radio transmitter, which is a composite signal of a television signal and a remote control signal composed of conventionally known video and audio signals, and is an amplitude modulated video signal and a frequency-modulated audio signal of 11tl. and the frequency distribution of pulse modulated remote control signal radio waves.

FIG. 5 shows a selection switching circuit using a remote control signal, which functions in combination with the radio receiver shown in FIG. 2 to operate the remote control on the VTR side and to display the VTR operating status on the video camera side. The remote control signal selection switching circuit searches for the same signal as the remote control signal generated by the remote control signal generator and performs switching control, and counts the wirelessly transmitted key signals using a binary counter BC disposed within the device. , the switching control is performed to match the preset signal.

Here, the operation signal of the VTR is recorded in the same way as the key signal generated from the remote control signal generator mentioned above. A...10
2411z, play B...51211z, rewind C
...256Hz, fast forward D...128Hz, pause E...64H2, power OFF F...32H
z, and the 611 recognition time of the signal is set to 0.31 seconds or more when the key signal is not canted, and here, it is assumed that 1024 + 512 4096, = 0.375 seconds.

After the confirmation time in this remote control signal selection switching circuit, the signal is changed to 1. α and maintains that state while waiting for transmission of the next switching signal.

FIG. 2 is a block diagram of a radio receiver, which is conventionally known (
D The demodulation of the pulse modulated wave of the remote control signal is different for the RF receiver. Radio receiver input voltage (high frequency human power)
is amplified by a high frequency amplifier, and its output is mixed with the local oscillator output to produce a video intermediate frequency output. After the output amplification, video detection, audio detection, and remote control detection are performed, and the video output, audio output, and remote control output are respectively output. It's being taken out.

FIG. 6 is an external view of the video camera and an enlarged view of the switching display at the bottom. A to F are switches for remote control operation of V'rR, A...recording, B...playback, C
...Rewind, D...Fast forward, E...Pause, F
...The power is OFF, and PA-PF is V, TR
FA・
...Recording, PB...Playback, PC...Rewind, PD
...Fast forward, PR...pause, PF...power ON
FF.

Fig. 7 shows an external view of the V'l''R and an enlarged view of the switching display at the bottom.A to F are for manual operation of the VTR and for transmitting the operation status of the VTR to the video camera. Switches for A...Record, B...Play, C...Rewind, D...Fast forward, E...Pause, F...Power OFF. -PF corresponds to the operation switch by displaying when receiving a remote control signal from the video camera side and when manually operating the V'TR, PA...Record, PB...Play, PC...Rewind, PD ...Fast forward, 1) E...Pause, PF...Power OFF F
, is.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, in which Fig. 1 is a block diagram of a wireless transmitter, Fig. 2 is a block diagram of a radio receiver, and Fig. 3 is a principle circuit diagram of a remote control signal generator. , Fig. 4 is a frequency distribution diagram of the wireless transmitter output signal, Fig. 5 is a principle circuit diagram of the remote control signal selection switch, Fig. 6 1a)
6(b) is an enlarged view of the switching display of the video camera, FIG. 7(a) is an external view of V 'f' R, and FIG. 7(b) is the switching display of the VTR. It is an enlarged view of the device. C11iCH2...Crystal oscillator OSC...Clock pulse generator (4096Hz) BC...Highly counter (1024,512,256,12&,6
4.32Hz) DET-Detector A... Recording B.
...Play C...Rewind l]...Fast forward E...
・Pause F...Power 0FFPA...Record PB
...Play PC...Rewind PD...Fast forward P
I3...Pause P F...Power OFF. Fig. 6 (a), (b) 1... Antenna 2... V 'l'' R remote control operation switch 4... Monitor TV for recording and playback. Fig. 7 ta), (b) ■...・Antenna 2...VTR operation switch
3...VTR operating status indicator. Patent applicant Takahisa Shimizu 3058-36 Higashisenri, Kawaki-cho, Aki-gun, Mie Prefecture Figure 6 (b) 3 Figure 7 (a)

Claims (1)

[Claims] +11 Video camera and video tape recorder (V'l"
In the mechanism for recording and playing back using R), the camera output cable that connects the two devices is removed, and the camera and VTR are each equipped with a transmitter/receiver using radio, ultrasonic, etc., and the VTR is operated from the camera side. Transmission of video, audio signals, and VTR operation signals (recording, playback, rewind, fast forward, pause, power OFF, etc.) necessary for
The VTR side receives the above signals, transmits the VTR operating status display signal, video and audio monitor signals during playback, and the camera side receives the signals, and the camera side records and plays the VTR. A video tape recorder characterized in that all operations required for the video tape recorder can be performed wirelessly.