JPH0429124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a recording and reproducing device for recording and reproducing video signals, a video signal generating device that supplies video signals to the recording and reproducing device, or a video signal from the recording and reproducing device to a television monitor. The present invention relates to a video system comprising a signal processing device and the like.

Currently, video tape recorders (hereinafter referred to as VTRs), which use magnetic recording, are the recording devices for recording images.
It has been known. VTRs are rapidly becoming smaller and it is becoming easier to record outdoors, etc., but the video camera and VTR must be connected with a cord and carried separately, and while holding the camera, the VTR can be easily recorded. There was a problem with the operability of recording by operating the operation buttons. Accordingly, video cameras incorporating a VTR have been proposed in recent years. However, although this type of system improves operability when taking pictures with the camera, when playing back, that is, when connecting to a separately prepared playback device and playing back on a TV, etc., the VTR is Since the video camera is made integrally with the video camera, care must be taken not to handle the video camera carelessly, resulting in problems with operability during playback.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a video system that is easy to use.

Specifically, it is possible to selectively attach a video signal generating device and a processing device for a reproduced video signal to a recording and reproducing device that records and reproduces video signals, and it is possible to selectively attach a video signal generating device and a processing device for a reproduced video signal to a recording and reproducing device that records and reproduces video signals. The object of the present invention is to provide a video system that restricts mode switching of a recording/reproducing device.

Other objects of the invention will become apparent from the drawings and the detailed description below.

FIG. 1 shows the connection relationship of each component constituting a video system according to the present invention. In the figure, 100 is a video camera (signal generator) that photographs a subject and generates a video signal, 200 is a television tuner that detects television broadcast waves, and 30
0 is a playback-only device (signal processing device) that performs signal processing to play video signals from a VTR (recording and playback device) on a television monitor, and 500 is a
It's a VTR. The VTR has a window 50 that allows you to see through the cassette.
1. It has an operation button (operation unit) 502 and a connection connector (second connector) 503, which can be selectively connected to the connectors 102, 202, and 302 of the video camera 100, teletuner 200, and playback-only device 300, respectively. It is inserted as shown by the arrow, and the terminals T1 to T5 are connected.

FIG. 2 is a block circuit diagram of each component shown in FIG. 1, and shows the connection relationship between terminals of each component. In the figure, 100, 200, 3
00 and 500 are the video camera, TV tuner, playback device, and VTR shown in Figure 1, respectively.
corresponds to

In FIGS. 1 and 2, we will first explain the case where the connector 503 of the VTR and the connector (first connector) 101 of the video camera are connected, the camera and VTR are combined, and recording is performed using the camera. . DC power supply 1 built into camera 100
05 is connected to the photographing tube 106 via the high pressure generation circuit 109.
A high voltage is applied to the VTR 500, and power is supplied to the power supply circuit 514 of the VTR 500 via the terminals T1-1 and T1. Further, the photographing tube 106 in the camera 100 transfers the image formed by the lens 102 to the photographing tube control circuit 1.
07 and video processing circuit 108, the video information converted into a video signal is output to the video signal output terminal T3-1. The signal is output to the audio signal output terminal T2-1 in a manner similar to that shown in FIG. Therefore, the video and audio signals are connected to terminal T.
3-1, T3 and T2-1, VTR via T2
The signal is input to the recording amplifier 511 of.

Here, the connector 10 of the video camera 100
1 has a protrusion A-1, and the protrusion is
Insert it into hole A on the VTR side and close switch SW1. In other words, switch SW1 is the operating switch for the recording amplifier 511 of the VTR, so when connecting the camera 100 to the VTR 500, be sure to
This means that the recording amplifier 511 of the VTR 500 can become operational. The video and audio signals input to the recording amplifier 511 are further transmitted to the head 513 and recorded on tape using a known method. Furthermore, 51
Reference numeral 2 denotes a reproduction amplifier which amplifies the reproduction signal from the head 513.
Since the camera 500 is not provided with a protrusion that closes the switch SW2 provided in the power supply path, the reproduction amplifier 512 is in an inactive state.

Next, a case will be described in which the TV tuner 200 is connected to the VTR 500 for recording. VTR5
00 to tuner 200, VTR50
The connector terminals T1 to T5 on the 0 side are connected to the terminals T1-2 to T5-2 on the tuner 200 side, respectively, and the protrusions A-2 and B-2 on the tuner 200 side are connected to the connector terminals T1 to T5 on the tuner 200 side.
closes the switches SW1 and SW2 through the holes A and B on the VTR 500 side. Chuyuna 200
As shown in the figure, there is an AD/DC converter 211 that converts alternating current from a connector 220 connected to a commercial power source into direct current and uses it as a power source for driving the tuner, and the output of the converter 211 is connected to terminal T1-.
2, and is supplied to the power supply circuit 514 on the VTR 500 side through T1. In the above state, the input signal from the antenna 230 is transmitted to the known RF demodulation circuit 214 via the distributor 212 and the tuning circuit 213, and the output of the circuit 214 is sent to the output terminal T3-2 as a video signal output. and are output to terminal T2-2 as audio signal outputs, respectively. These video and audio signals are input to the recording amplifier 511 via terminals T2 and T3 on the VTR 500 side, and are recorded through the same process as in the case of the video camera described above. During playback, the switch SW2 of the playback amplifier 512 is closed as described above, so the playback signal from the head 513 passes through the playback amplifier 512 and is output as an audio signal to the terminal T4 and a video signal to the terminal T5. These two signals are input to the RF converter circuit 215 via the tuner side terminals T4-2 and T5-2, and the output of this circuit is the RF converter circuit 215.
Video playback/TV broadcast switching circuit 26 as output
input to the television receiver 2 in a known manner.
The signal is input to the antenna terminal 40 and the video is played back. Further, since the output from the aforementioned distributor 212 is also input to the video/television switching circuit 216, the input signal from the antenna 230 can be reproduced by the television receiver 240 via the tuner 200. .

By connecting the tuner 200 to the VTR, both the recording amplifier 511 and the reproducing amplifier 512 on the VTR side are turned on, enabling both recording and reproducing modes for the VTR. here,
Whether to set the recording mode or the playback mode is switched by operating the brake of the operation key 502 disposed on the VTR side or the recording key. Switching between playback and recording within the VTR 500 is well known, so a description thereof will be omitted.

Next, the VTR playback-only device 300 will be explained.As is clear from the circuit configuration of the playback-only device 300 when compared with the circuit configuration of the TV tuner 200 described above, it is only impossible to record television broadcasts from the antenna terminal. The reproducing circuit is an RF converter circuit 315 as explained for the TV tuner 200.
and a video playback/television broadcast switching circuit 316, which have exactly the same configuration. Therefore, the regeneration-only device 300
By connecting the tuner 200 to the VTR 500, the protrusion B-3 on the playback-only device 300 side closes the switch SW2 through the hole B on the VTR 500 side, and through the process described for the tuner 200, playback from the VTR 500 is performed. The signal is reproduced by television receiver 340.

FIG. 3A shows a VTR 50 according to another embodiment of the present invention.
3B is the internal circuit diagram of the video camera 100' connected to the VTR 500', FIG. 3C is the internal circuit diagram of the television tuner 200' connected to the VTR 500', and FIG. 3D is VTR50
FIG. 3 is an internal circuit diagram of a reproduction-only device 300' connected to the power supply terminal 0'.

First, the VTR 500' will be explained. Figure 3A
In this case, EH is the erase head, AH is the audio recording head,
The playback heads, VH1 and VH2, are the recording and playback heads for video.
Use VH2 alternately. CH is a recording/reproducing head for the control signal CTL; 558 is a video recording/reproducing head; a motor for rotating the heads VH1, VH2 in order to record signals diagonally on a magnetic tape or reproduce information from a slant track;
SW10 to SW20 are analog switches, especially SW
10 is a changeover switch that is switched by the playback or recording signal from the control circuit 560;
This is a head changeover switch that changes using the CTL signal.
SW1' and SW2' are switches similar to SW1 and SW2 in Fig. 2, T1' to T5' are input or output terminals similar to T1 to T5 in Fig. 2, T6 is an input terminal for the vertical synchronization signal, A', B' is a through hole similar to A and B in FIG.

Explain the operation.

Key input information from key input circuit 561 is transmitted to control circuit 560. The control circuit 560 switches the connection contact of the switch SW10 to the recording key or the playback key. SW where the recording key is pressed
Contact point 10 is switched to the R side. At this time, video camera 100' or tuner 200' is VTR50.
0', the switch SW1' is closed as in the previous embodiment, and the audio amplifier 551,
The video amplifier 552 and the CTL recording amplifier become operational. Also, switches SW11, SW12, SW
14, SW15, and SW17 are closed, and power is supplied to the erase head EH. Also, SW12 closes,
Since SW13 is open, the audio head AH is in recording mode. Also, since SW15 is closed and SW18 is open, video heads VH1 and VH2 are also in the recording mode.

Furthermore, SW14 is closed and SW20 is open, so CTL
The head CH is in recording mode. Also, the speed control circuit 557 controls the motor 5 by the output of the speed detection circuit 559 and the vertical synchronization signal via the switch SW14.
The speed of 58 is servo controlled. If SW1' is not closed even if the recording key is pressed, that is, if the video camera or tuner is not connected, and even if the video camera 100' or tuner 200' is connected, When the main switches MS1 and MS2 are not closed, the VTR 50' does not enter the recording mode.

Next, the playback key is pressed and switch SW10 goes to P.
When the VTR 500' is switched to the contact point, and the tuner 200' or the playback-only device 300' is connected to the VTR 500', and the main switches MS2 and MS3 are closed, the VTR 500' enters the playback mode.

By closing SW2', the audio reproduction amplifier 553,
Video reproduction amplifier 554, CTL reproduction amplifier 556
Power is supplied to the devices and they become operational. Then, the switch SW11 becomes open, and no erase current is supplied to the erase head EH. or,
Since the switch SW12 is open and the switch SW13 is closed, the audio head AH is in the playback mode. Similarly, the switch SW15 is opened and the switch SW18 is closed, so that the video heads VH1 and VH2 playback mode is established. Furthermore, switch SW14 is opened, and the switch
Since SW19 is closed, the CTL head CH also enters the playback mode. Further, servo control of the motor 558 is performed by the output of the speed detection circuit and the output of the CTL regenerative amplifier 556.

Next, the video camera 100' will be explained using the circuit shown in FIG. 3B. In the figure, 152 is a microphone, 160 is a lens system, MS1 is a main switch, and T1-1' to T3-1' are T1-1 to T1-1'.
An output terminal similar to 3-1, T6-1, is an output terminal for a vertical synchronizing signal. The output voltage of the battery 150 is sent to the constant voltage circuit 151 when the main switch MS1 is closed. The output voltage of the circuit 151 is supplied to the power supply circuit of the VTR 500' via the terminal T1-1', and is also supplied to each circuit in the video camera 100'. A high frequency bias is added to the audio from the microphone 152 by the bias adding circuit 153, and the audio is sent to the VTR 50 via the output terminal T2-1'.
The signal is supplied to the audio head AH of 0' and recorded on the magnetic tape.

Further, the output of the constant voltage circuit 151 is supplied to the high voltage generator 15.
4, it is converted to high voltage and input to the imaging control circuit 163, and a synchronization signal from the synchronization generator 164 is input to the other input terminal of the imaging control circuit 163. Control circuit 163 controls image pickup tube 155 using both signals. The video signal obtained by the image pickup tube 155 is converted into each color signal R, G, and B by a video processing circuit 156, and then converted into a luminance signal and color difference signals R-Y and B-Y by a matrix circuit 157. The color difference signal is further balanced modulated by a balanced modulation circuit 161, and then converted to a low frequency range for recording on a magnetic tape. Also, the luminance signal is sent to the FM modulation circuit 15.
FM modulated at 8. These low frequency converted color difference signals and FM modulated luminance signals are mixed in a mixer 159. This mixed video signal is output from output terminal T3-1',
The video signals are supplied to the video heads VH1 and VH2 via input terminals T3' and the like on the VTR 500' side, and the video signals are recorded on the magnetic tape.

Further, a protruding pin A-1' is provided on the housing 180 in order to put the VTR 500' into a recording mode.

Next, according to Figure 3C, the television station 20
The circuit operation of 0' will be explained. AC voltage from commercial AC power source is outlet 250, main switch MS2
is input to the AC-DC converter 251 via
- The DC converter supplies DC voltage to each circuit within the VTR 500' and the tuner 200'. antenna 2
The television signal from the broadcasting station 52 is tuned and detected by the tuner 253, and then sent to the audio receiving circuit 254.
Only the audio signal is extracted. Audio receiving circuit 2
The output of 54 is applied with a high frequency bias for magnetic recording by a bias adding circuit 264, and then sent to the VTR.
500' audio head AH. On the other hand, the color video signal is received by the video receiving circuit 255, for example.
NTSC color signal is taken out and YC separation circuit 2
65. The YC separation circuit 265 is composed of a high-pass filter and a low-pass filter, and separates the luminance signal Y and color signal C. The luminance signal Y is
The FM modulator 266 performs FM modulation, and the low frequency conversion circuit 267 converts the color signal C to a frequency lower than the frequency band of the FM modulated luminance signal. Further, the luminance signal Y is supplied to a period separation circuit 256, a vertical synchronizing signal is taken out, and the synchronizing signal is supplied to the VTR 500'. These synchronization signals, FM modulated luminance signals, and low frequency conversion color signals are mixed in a mixer 268 and sent to the terminal T.
3-2', the video head of VTR500'
Supplied to VH1 and VH2.

On the other hand, the reproduced video signals from the video heads VH1 and VH2 are input to the terminal T5-2', and are separated into a luminance signal Y and a chrominance signal C by a YC separation circuit 263 consisting of a high-pass filter and a low-pass filter. The luminance signal Y is demodulated by the FM demodulator 261, and the range-converted color signal C is sent to the high-frequency conversion circuit 2.
62, the frequency is converted to a high frequency band. Furthermore, the luminance signal Y
and color signal C are mixed in a mixer 260, and the NTSC
color television signal. This color television signal is sent to switching circuit 259.
Further, the reproduced audio signal inputted to the terminal T4-2' is directly inputted to the switching circuit 259. Switching circuit 25
9 also includes an audio signal from the audio receiving circuit 254,
A color television signal from the video receiving circuit 255 is input. A switching circuit 259 selects whether the audio signal and color television signal are reproduced from the VTR 500' or input from the antenna 252. Then the selected audio signal is sent to speaker 2.
The selected color television signal is reproduced as an image on a television monitor 258.

Since the playback-only device 400' of FIG. 3D is simply the television tuner 300' of FIG. 3C with the recording circuit removed, its explanation will be omitted.

A detailed structural sectional view of the protruding pin A-1' shown in FIG. 3B is shown in FIG. 4.

In the figure, a housing 18 of a video camera 100'
0' is provided with a hole 10 through which the pin A-1' passes and a bent part 180', and the pin A-1' has a locking part 30 that restricts the amount of protrusion of the pin. The pin A-1' is always urged by the spring 50 in the direction in which the pin protrudes. When connecting with VTR500', through hole A-1'
When the taper part 40 of pin A-1' does not come into contact with
As a result, the pin A-1' is pushed into the housing 180, and when it comes into contact with the through hole A-1', it is inserted into the through hole. When inserted into the through hole A-1', Fig. 3A
Press the metal piece 60 corresponding to the switch SW1' and bring one end of the metal piece 60 into contact with the electrode 60.
Conductivity is established between the electrodes 60 and 85. Since the metal piece 60 is normally urged toward the housing 580 by the spring 70, the electrodes 60 and 85 are in an open state when the pin A-1' is not inserted. Although only pin A-1' was explained here, A-2', B-2', B-3', A-
It has the same structure as 1'.

Next, FIG. 5 shows still another circuit diagram of the VTR of this embodiment.

Components in FIG. 5 having the same functions as those shown in FIG. 3A are indicated by the same reference numerals with a ``''' added thereto. In the figure, SW51 to SW58 are switches that are closed when a video camera 100' or a television tuner 200' is attached and the recording mode is selected by the key input circuit 561' of the VTR 500'. Also, SW61 to SW66 are
TV tuner 200' or playback only device 30
0' is attached and is a switch that closes when the playback mode is selected by the key input circuit 561' of the VTR 500'.

In the recording mode, the audio amplification circuit 571 amplifies the input to the audio input terminal T2'' and records the audio on the audio head AH'.In addition, in the playback mode, the audio amplification circuit 571 amplifies the input to the audio input terminal T2'' and records the audio on the audio head AH'. amplify,
It is output to the audio output terminal T4''.

On the other hand, when the video amplification circuit 572 is in the recording mode,
Amplify the input from the video input terminal T″ and connect it to the video head.
Video recording is performed on VH1' and VH2'. In the playback mode, the playback outputs of the video heads VH1' and VH2' are amplified and output to the video output terminal T6'.

Also, the CTL amplifier circuit 573, when in recording mode,
Amplify the vertical synchronization signal input to terminal T6'
It is supplied to the CTL head CH' and also to the motor control circuit 557'. Motor control circuit 55
7' controls the speed of the drum motor 558'. In the reproduction mode, the reproduction CTL signal of the head CH' is amplified and supplied to the motor control circuit 557', and the motor control circuit 557' controls the speed of the drum motor 558'.

As described above, in this embodiment, the amplification circuit for recording and the amplification circuit for playback are both used, and the amplification circuit changes the recording mode according to the attached equipment.
Alternatively, the mode is switched to playback mode.

As described above, according to the present invention, by selectively coupling the recording and reproducing device to the video signal generating device and the signal processing device, it becomes possible to restrict the mode switching of the recording and reproducing device. Alternatively, a versatile and compact video system for playback can be configured. Further, in a preferred embodiment of the present invention, mode switching of the recording and reproducing apparatus is automatically and reliably restricted depending on the recording, reproducing, or recording/reproducing mode simply by connecting each unit. I can do it. Therefore, the recording and reproducing apparatus does not perform meaningless operations, and the power for the recording and reproducing apparatus is supplied from the individual devices that are selectively coupled, so that unnecessary power consumption can be reduced.

Further, in a preferred embodiment of the present invention, the circuit configuration within the recording and reproducing apparatus is simplified by using both the amplifying circuit for recording and the amplifying circuit for reproducing.

The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a perspective view of each device constituting the video system of this embodiment, FIG. 2 is a block diagram of each device in FIG. 1, FIG. 3A is a block diagram of a VTR of another embodiment, and FIG. Figure B is a block diagram of a video camera connected to the VTR in Figure 3A, and Figure 3C is a block diagram of a video camera connected to the VTR in Figure 3A.
Figure 3D is a block diagram of a television tuner connected to the VTR of Figure 3A, Figure 4 is a cross-sectional view showing the specific structure of the protruding pin, Figure 5 The figure also shows other embodiments.
It is a block diagram of a VTR. In the figure, 100 is a video camera (signal generator);
101 is a first connector, 300 is a reproduction-only device (signal processing device), 301 is a third connector, 50
0 is a VTR (recording and reproducing device), 501 is a second connector, and SW1 and SW2 are switches (detection means).

Claims (1)

[Claims] 1. A video signal generating device having a video signal generating means for generating a video signal and a first connector, a recording mode for recording the video signal from the generating device on a recording medium, and the recording medium. a recording and reproducing means that can take a reproducing mode for reproducing a video signal recorded on a video signal; an operating section for setting the recording and reproducing means to the recording mode and the reproducing mode; and a mechanical connector connected to the first connector. a recording and reproducing device having a second connector connectable to the recording and reproducing means; a signal processing means for converting the video signal reproduced by the recording and reproducing means into a form that can be viewed as a video on a television monitor; a signal processing device having a mechanically connectable third connector, the recording/reproducing device having the first connector and the third connector mechanically connected to the second connector. further comprising a detecting means for detecting that the first connector is connected, and when the detecting means detects that the first connector is connected, the recording and reproducing means is set to the reproducing mode by operating the operation section. and when the detection means detects that the third connector is connected, the recording and reproducing means is disabled from being set to the recording mode by operating the operation section. video system.