JPS58139573A - Receiving and recording/reproducing device of television signal - Google Patents

Abstract

PURPOSE:To monitor a TV signal during reproduction of a VTR, by controlling a changeover switch of a signal path with operation of a channel selection switch. CONSTITUTION:A TV tuner 6 and a tuner incorporated in a VTR9 are controlled with operation of a channel selecting switch 1 and via channel selecting circuits 2 and 3 of the TV and VTR sides and potentiometers 4 and 5 of the TV and VTR sides respectively, and can deliver and record the signal of a prescribed station. A switch control circuit consisting of transistors TR11 and TR12 connects an analog switch 10 to the side of the VRT9 by a ply signal 16 during reproduction of the VTR9 and delivers a video signal 21 and audio signal 22 of the VTR9 to lines 23 and 23 respectively. If the switch 1 is operated under such conditions, the switch control circuit connects the switch 10 to the side of the TV to deliver the video and audio signals of the TV side of a VIF circuit 7 and an SIF circuit 8 to the lines 23 and 24. Thus the TV signal can be monitored.

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a device for receiving, recording and reproducing television signals on a VCnd. The present invention relates to a device which is capable of monitoring the contents of a broadcast signal being broadcast even during VTR playback, especially in a fully built-in television receiver or the like. [Technical Background of the Invention] In general, when receiving, recording, and internally transmitting all television signals, it is necessary to combine all TV receivers and VTRs. I'm here. Recently, some FV receivers have a built-in VTR. For TV receivers with a built-in VTR, in order to simplify operation of the VTR, especially recording, when you want to record broadcasts that are received by the TV receiver, turn on the recording switch installed on the VTR. Just press V to record
If you want to play back all the contents recorded on the V'l''l tape, just press the playback switch installed on the VTR to play the video from the TV broadcast signal currently being received. It switches to the endogenous signal of 'R, and the recording inner world becomes visible.Furthermore, during the recording of ■゛R, the broadcast sound is received by a TV receiver on a different channel from the recording naya (back). When recording a program), all switches called monitor switches are installed to check the recorded content, and all switches are operated by VC,
1: You can now check the broadcast content of the channel that is being recorded separately from the channel that is currently being received.4+1. In this way, when a program is being recorded, the recorded content can be monitored using the recording monitor switch. [Problems in the Background Art] However, in conventional television receivers with a built-in VTR, when checking the contents of a TV broadcast during playback, the user must operate a stop switch installed on the VTRVC.
In order to stop the R' mode, the screen works hard to switch to the content of the broadcast being received by the TV receiver from the R playback signal strength, and then select the desired channel by operating the TV (regular channel selection switch). It was necessary to change the channel to the channel to be played.Moreover, if the entire recorded content of the vTit tape is displayed after the end of monitoring the broadcast content, it is necessary to operate the VTR's t1 + live switch (a) again. , for this reason, VTR
There is a problem in that it takes a lot of time and effort to temporarily monitor and confirm the content of a W broadcast during playback using conventional devices. [Purpose of the invention] Purpose of non-invention 6, in view of the above-mentioned points, it is possible to
To temporarily monitor V broadcast signals, press all the channel selection switches in the position you want to monitor.
An operability device that allows you to monitor only the song you are operating on TV broadcasts without interrupting the entire TR playback operation ['
The aim is to provide the following. [Summary of the Invention] The device of the present invention includes a detection means for detecting that the i"V side tuning switch is operated, and an input terminal connected to the detection means and the VTR playback switch to connect the TV side and the VTR side. Control signal generation means that generates all switching control signals and the control W11 signal are used to generate video and audio signals on the TV side and the VTR1n.
It is fully equipped with signal switching means that switches all video and audio signals and outputs any one of the 10,000 side signals, and generates all control signals based on the VTRI' + raw switch during VTR playback.
In addition to outputting the TR side video and audio signals, when the VCVTR playback channel selection switch is operated, a control signal based on the detection means is generated only while the switch is being operated, and the TV side video and audio signals corresponding to the operated position are generated. and output V'
14) The VC is configured such that all control signals for the 1■ side are generated when other than l''R playback and outputs the 'rV side video and audio signals corresponding to the operated position. 14).
The specific configuration of the control signal generation means and signal switching means is as follows. The detection means is constructed in such a manner that one end thereof is connected to 111 (connected to the control signal h4 generation means) in conjunction with the 1■ side tuning switch, and the other end is connected to 111 (connected to the control signal h4 generation means). Consists of a direct connection circuit, from the collector of the input stage emitter grounded circuit to the 'rV side video and audio signal switching control signal sound Ir+, from the output stage emitter grounded circuit collector to the VTR (1111 video, control signal for switching the Kisei Ipa number) It is configured so that the 1st and 1st signals can be switched from the 1st to the 4th switch.
(2 These steps 4 Tuna All the above human power ↓ Invasion' Emitter contact 11
．． '+ Control from the collector of the circuit 4M "+" turns on, 4-) (, VTR side video and audio signals from 3rd and 4th
4t (Two people are required to connect these switches to the output stage - L mitter contact 11μ circuit collector)
It is configured to turn on and off using a double signal. [Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 is a circuit diagram JJy of a channel selection and signal switching device for a television receiver with a built-in VTR according to the present invention.
In the figure 1, the tuning device includes a tuning switch 1, a TV side tuning assist circuit 2 connected to this tuning switch 1, and a VTR.
A side tuning circuit 3, a TVI rule potentiometer (including a band designation switch) 4, and a VTR side potentiometer (including a band designation switch) 5 connected to these tuning circuits 2 and 3, respectively. , a TV tuner 6, V'I) connected to these meter 4, 5, respectively.
'(Video intermediate frequency amplification) circuit 7, SIF (sound intermediate frequency amplification) circuit 8 and VTR base 11.(3
-J--Inner ridge) 9. selections・
1 tchi 1 is the normal reception channel/L 'F VCL '',
,L',: 1112 ;l; Me"y' Fl nnos'l tsuf (respectively IP. 21), -, 1213 dosuru)〃・

[-) consists of
Position switch IP is 1゛V1 rule channel selection switch A1. ``V1゛R1 rule selection switch I (], consists of a detection switch itself for detecting that the position switch IP has been operated, and these switches A,...
H,,cl are motion switches. Posinoyon・
Switch 2P, 3P.・-, 12PVC) Ite is also a big 'l'vol! l Su(
Tsuchi A2. A3. ``'rA1□ and VTR side switch RO2.''3+..., B12 and detection switch c2. C
3+...+C12 meetings, each position JlJVC association! ((1) constitutes the switch. rV side and V side
Tlt 1 channel selection circuit 2 and lj: respective input terminals KIN
, output terminal K. The input terminal (GIN) of the TV side tuning circuit 2 is connected to one end of the TV side tuning switch A, ~A12, and the input terminal KIN of the VTR side tuning circuit 30 is connected to It is connected to one end of the V'l''R side tuning switches B1 to B12 through the T channel locking transistor 14. Also, it is connected to one end of the V'l''R side tuning switch B1 to B12 through the T channel locking transistor 14.
TV ill! 1 to the other ends of the tuning switches A1 to A1°, respectively, and terminals 1 to 12 to the output terminals of the tuning circuit 3 of the VTR 11111 and 12 to the other ends of the VTR side tuning switches A1 to B12, respectively. 1゛V side left//Yo On the input side of the meter 4 is the W side tuning circuit output terminal -fK. Connect 1□ to ~, and output the tuning voltage vT and band switching signal from its output side. ) rTV tuner 6,
Also, Id and V are connected to the input terminal of potentiometer 5 on the VTR side.
+ -K12 k is connected to the TR side tuning circuit output terminal, and the tuning voltage VT and band switching signal U,
VL and VH are output to all VTR units. '1゛Vchi:1. - Connect the i'V VIfi' circuit 7 to the i'V SIF' circuit 8 for the TV.
are connected. These 11V river VIF lr; circuit 7 and 5IIi'1 ■ road 8-? A signal switching analyzer is connected between the V'l'R-J body 9 and each position/on operation detection switch C1 to C12 of the channel selection switch 1.
゜No. 48 switching device is V11F' circuit 7 and 5T for i"V
Flit I circuit 8°VTR body 9 has a signal switching analog
The switch 10 is connected (to this switch 10, the signal switching control circuit consisting of transistors 11 and 12 is connected), and the entire signal switching circuit 1 is connected.The signal switching transistors 11 and 12 are connected to the emitters. is grounded, and the collector of transistor 11 and the base of transistor 120 are connected through resistor R1.
The VC is configured such that it is connected to the -C DC power supply VCC through the transistor 11, and one end of the recording monitor switch 13 is connected to the collector of the transistor 11 (while the other end of 7 is all grounded,
The collector of the transistor 11 is connected to the switch circuits SWI, S to 2 of the signal switching analog switch 10, and the collector of the transistor 12 is connected to the switch circuits SW3 and SW4 of the signal switching analog switch 10. The base of the transistor 11 is connected to one end of the detection switches 01 to C12 of the all-channel selection switch 1, while the other ends of the switches C1 to C, are all grounded. A VTR channel lock transistor 14 is connected between one end of the channel selection switches B1 to B1□ and the input terminal KIN of the VTR side channel selection circuit 30, and this transistor 14 connects R to a signal 15 (when recording The transistor 110 is configured to be turned on and off at the "9 songs always N'H" level.
All 'A'(3'A, 1t4 PLAY Iha No. 16 (V'l"l尤11) Cow time Pa! 1", 1'L" level when not playing) is input to the base, and this At the turn 16, all transistors 11 are turned off. In addition, a signal 111 is sent to the collector output of the transistor 11 as a code switching control signal 17. Supply to SW2,
These SWI, SW2 are turned on and off, and the switch circuit SW3 . SW4 and these SW3. SW4 yet, -a is turned on and off. Switch 1 packing path SWI is 'r■
A TV video signal 19 is input from the VIF circuit 7 for S~
v2 has 5IFr for TV! i path 8 to 1゛v audio signal 2
0 is input manually, 21 VTR video signals are input from the VTR main unit 9 to SW3, and the VTR audio signal 22 is input manually from the VTR main unit 9 to SW3, and the video signal output 23 is obtained from switches SWI and SW3. , SW
2. Configure to obtain audio signal output 24 from SW4
V, L, I'm here. This is more than 1! ! 1 road t4 # In IW, when the channel selection switch 1 is operated, the TV side channel selection circuit 2 detects the sound that the operation has been made, selects 1 to 1□ to the bottom of the operation, and selects 2, TVILItl button. : Band switching signals U, vL, Vl from meter 4, and tuning box 1 pressure ■T
7. Generate the signal, send the signal to the TV tuner Fit/C, and send the signal to the TV tuner Fit/C. Video signal 19 through 8 SIF circuits
One loaf of reed signal 20 is output. Similarly, on the VTR side, band switching signals U, vL, v■ and tuning voltage vT
V'rl (, sends it to the tuner built in the main unit 9 to select a station, and sends the video signal 21° and the audio signal 2 from the VTR main unit 9.
Output 2. output from the VTR body 9 21.22
Depending on the operating state of the VTR, either a selected broadcast signal or a playback signal is supplied to the VTR. At this time, when the VTR is in the recording state, the RECIN signal 15 changes from the ``H'' level to the ``L'' level, turning off the transistor 14. Therefore, when the VTR is recording, the d' channel selection switch 1 is operated. Even if you change the VTR, the tuning position of the VTR will not change. (V
The TR tuning position 7 is 1 to 1 on the VTR side tuning circuit output side.
is latched to 12. ) However, the channel selection position on the TV side is when transistor 14 is on. Since it changes regardless of whether the TV is off or not, the TV side and the VTR side can select the respective positions, making it possible to record the opposite program. Video signal 1 selected and output in this way
9.21 and audio signals 20.22 are sent to a signal switching analog switch 10. This signal switching analog switch 10 is controlled by a signal switching control signal 17.18. When the signal 17 is "H" and the signal 18 is 'L', the TV
The video signal 19 and audio signal 20 on the side become video and audio signal outputs 23 and 24, respectively. Signal 17 is u, /1. signal 18
is 'H', the video signal 21 and audio signal 2 on the VTR side
2 are video and audio signal outputs 23 and 24, respectively. When the VTR is in a state other than playback, the PLAY signal 16 is 1''.
The signal switching transistor 11 is turned off. Therefore, the transistor 12 is turned on, the signal 17 becomes ``H'', the signal 18 becomes ``L'', and the video and audio signals on the TV side become the video and audio signal outputs 23 and 24, respectively.
Monitoring is possible using the RT screen and speakers. If the recording monitor switch 13 is operated in this state, the signal 17 will be forcibly set to "L" and the signal 1/11H/
/, so the video and audio signals on the VTR side are respectively video and audio signals.
The audio signal output becomes 23.24. When the VTR enters the playback state, the PLAY signal 16 goes high, turning on the signal switching transistor 11. Therefore, the transistor 12 turns off, and the control signal 17 goes to 1.
1L", signal 18 becomes H", video and audio signal output 23
The video and audio signals of the VTR 1411 are outputted as .degree.24. In other words, when playing back all recorded contents of a VTR tape, V
Simply by operating the playback switch on the TR and inputting all PLAY signals to bring all 7Q of the VTR into the live state, the screen switches from the television broadcast signal to the VTR playback signal. In addition to the circuit that operates as described above, the present invention is provided with means for detecting that the channel selection switch 1 is being operated. This detection means t, in FIG.
1) corresponds to swing f C1 to C12 of 12P. Using this detection means sound, the signal switching transistor 11
The base td, B remains at the 11L level while the M3 switch 1 is operated. Therefore, when the channel selection switch 1 is operated during VTR playback, the TV and VTR channel selection positions correspond to the operated switch f'. When the channel selection switch 1 is operated in this operating position, the base of the switching transistor 110 becomes "L", and the base of the switching transistor 110 becomes "L". signal 1
7 becomes "II", signal 18 becomes I7', and the video team. The audio signal output 23.24 is from the VTR side.
, station J switched to the fCTV broadcast signal, and the broadcast contents were viewed.
Mo: - I can do it. When the VTR is in a state other than playback, INL
Since the AY signal 16 is 'L', the transistor 11 is off regardless of the operation of the channel selection switch 1, and the signal 17 is '11 (II), and the signal 18 is '1L', so the TV 111 is
! Receive all internal medicine broadcasts tuned on l. . In this way, even during ~7i'R playback, you can operate all the channel selection switches for the desired channel selection position on the monitor.VC
Therefore, the content of television broadcasting can be easily monitored without interrupting the entire reproduction operation of the VTR. FIG. 2 is a circuit diagram of the tuning N path 2 connected to the 1V side tuning switches A1 to A12 of FIG. 1. However, the circuit can also be applied to the tuning circuit 3 connected to the VTR side tuning switch 1-Bt2. In this figure, each channel selection switch A1 is connected to a channel selection display element LED, ~
Tuning voltage generation with 12 LEDs (1 path 25,
And channel up signal -541JP, channel down signal]) OWN? I have 26 minutes to enter the car; In addition, the symbol ■]~vt't,,, is lI (resistance, ZD is a constant voltage diode, I) 1-1) 12 and D1-1] which is used to preset the tuning voltage vT by the power source. 1≦ is a diode for applying a forward bias voltage. In Fig. 2, the tuning circuit e is the switch A1 to A1□
The input terminal KIN receives an 11H" level signal when the switch is operated, and the 11H" level signal is input to the output terminal that holds the channel selection position corresponding to the operated channel selection switch at the "L" level and outputs it.
In addition, a resistor I (5° R6 is connected to the DC power supply, and a channel up and channel down signal input terminal CI (U) is connected to the capacitor C2 and grounded. , CHI), the input terminal VCC of the DC m source is connected to the DC power supply and the oscillation circuit, and the O8C terminal is connected to the DC power supply and the 16-line inverter buffer's 13 to 16 terminals and the oscillation circuit. 7L SK
l) Terminals, initial set circuits and NO
R) DEF' terminal connected to the circuit, GNI for grounding)
Terminals are placed. In such a terminal configuration,
An oscillation circuit 27 is connected to the input terminal KIN, and its output is input to a pulse mixer 28.The channel up or down signal from the input terminal CHU or CHD is passed through a buffer 29 or 30 and then converted into a direct pulse. - It is configured to be input to the mixer 28 or input to the pulse mixer 28 via the up/down memory 31, and the output of the pulse mixer 28 is 4-piston pinary depending on the up and down operations.・Complete down counter 32
The output of the pulse mixer 28, which is input to J1, and Lr for up and down, is input to the initial cell N! , this output is configured to output an initial set of the 4-bit binary up/down counter 32.The output of the 4-bit binary up/down counter 32 &:t
It is input to the buffer 37 of the 16 line inverter through all the 4-16 line e-decoders 36, and the output terminal is 1 to -.
1g to specify all selection positions for 2 and 13 to 16
It is configured to output the number. In such a single channel configuration in FIG. 2, when any of the channel selection switches A1 to A12 is operated, the input terminal K
IN becomes “H” level. Input terminal KIN becomes 11H.
” level, the oscillation circuit 27 operates and the pulse mixer 28 outputs a 4-bit signal according to the up and down operation
A pulse is sent to the binary up-down counter 32, which activates the 4-bit binary up-down counter 32, and further pulses the 4-16 line decoder 36.
After tracing and converting the code, the 16-line inverter buffer 31 is operated to output a signal of 1,77 level.The output position of the 16-line inverter buffer 37 and the operated channel selection switch When the positions of A match, the input terminal KIN goes to the ``L'' level, and the oscillation of the oscillation circuit 27 becomes positive 1. The output phase of the 16-line inverter threat buffer 37: All the selected channel positions are 1.L.
Latch to level. Figure 3 shows the channel up and down signals U in Figure 2.
FIG. 4 is a circuit diagram showing another circuit structure of the input circuit 26 of P and DOWN. In Figure 3, a diode 1) an D is connected to the DC power supply VCC.
l. ? Connect the cathodes of those connected in series, and connect the resistor Ra mirror to ground, and connect the resistors Rb and Ro'fr to the anode side of the goo1ode Db, and connect the resistors +, t,
, Rc are transistors Qa*Qb1 . (Connect the base VC channel up signal UP, channel Φ
It is configured to input the down signal DOWNY, and is further connected to the input terminals CHU and CHDK via the resistor 1 (d. Re). In this circuit configuration, the transistors Qa and Qb
The up signal UP and down (f
Issue i DO■1 Each person will do their own work. FIG. 4 shows C/MO used for each switch 1/1 path SWI to SW4 of the signal switching analog switch 10 in FIG. 1.
FIG. 8 is a circuit diagram of a type 8 integrated circuit. In FIG. 4, symbols P and N indicate P channel MO8, respectively.
-FET, N channel 1■O8-FET, complementary type] C-IVIO8 structure 75 Te. Also, the code lN1
0UT and OUT/IN are the input and output terminals of the switch, indicating that the input and output are mutually identical switches. However, VDD is a power supply voltage, and VSS is a GND voltage. In this circuit, control human power CIN 'k "H"
When set to level, lN10UT, OU between switch input and output
T/IN becomes low impedance, and becomes high impedance when set to uI, ii level. Therefore, the signal switching control signal 17 or 18 is input to the control input CIN, and the video signal 19.21 or the audio signal 20.21 is input to the input terminal IN.
It is configured so that all 22 signals are input, and 23 video signal outputs or 24 audio signal outputs are taken out from the output terminal OUT. FIG. 5 shows the operation of the television receiver incorporating VTll' according to the present invention. , is a timing chart for explaining. In FIG. 5, the horizontal columns indicate the operating modes of this device,
This column includes TV reception, V'! 'R recording, VTR
Shows rewind, YrR playback, recording monitor, TV monitor, and video channel switching. m: column is 1° to 1° to the TV side channel selection circuit output terminal (corresponds to TV channel)
and 1 to 12 (■T1℃) to the VTR side tuning circuit output terminal.
(compatible with channel channel), TV side and VT
Each output signal of R1111 video and audio signal outputs 23 and 24 is shown. The signal levels 1 to 12 on the TV and VTR side channel selection circuit output terminals indicate that the operated position is latched to the 11L level, and the TV and VTR side video and audio output levels are on the signal level. VTRill!l output power is ``H'' when recording is monitored and during ■゛R playback by switching.
``Rehertonari, TV reception fl'', VTR recording, V
When rewinding the TR, the TV side output is “H” when monitoring the TV.
It shows that the level is However, the TV monitor is 1
The case where all channels are monitored is shown. In addition, in FIG. 1, the detection switches C1 to C1□ that detect whether the tuning switch 1 is operated are described as mechanical switches that operate in conjunction with the tuning switch, but the invention is not limited to this. For example, it can also be realized using an electronic switch. Also, as an example of the channel selection circuit shown in Fig. 1, the arrangement shown in Fig. 2 may be used. Although the circuit for performing the town channel selection operation has been described, the present invention is of course applicable not only to this operation method but also to other channel selection operation methods. Also, the signal switching analog switch shown in FIG. 4 can be implemented with other 10-way configurations. Also, in the above explanation, an example was given in which a VTR is built into a 'rv receiver, but it is not necessarily necessary to have a built-in VTR and it can be connected to a TV receiver.
It is also possible to separate rR and connect them externally. [Effects of the Invention] As described above, according to the present invention, there is provided means for switching and outputting the VTR playback signal to the TV broadcast signal of the tuned position only while operating the channel selection switch during VTR playback. If you want to temporarily monitor all W broadcast signals during VTR playback, simply operate the channel selection switch in the position you want to monitor, and the TV broadcast will be broadcast only while the VTR is in operation without interrupting all of the VTR playback operations. Monitoring all the signals becomes l'J fit:, and it is possible to realize a device with good operability.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the apparatus for receiving, recording and reproducing television signals according to the present invention. FIG. 3 is a circuit diagram showing another embodiment of the input circuit for the channel up signal and channel down signal in FIG. 2, and FIG.
FIG. 5 is a circuit diagram showing an example of a C-MO8 type integrated circuit that is used in a switch once a month. FIG. 1°...Tuning switch, IP-12P...Returning station position, A1-A1□...TV 11111 tuning switch, 81-B1□...VTI one-rule tuning switch, 0
1~CI2°...detection switch, 2...i'V
(ti11 tuning circuit, 3-V'rR1 [11 tuning circuit,
4゛・°TVI1111PO”j7 show) - Evening,
5...v'ri 1 rule boden 7 yo meter, 6-T
V tuner, 7-VIF times M, 8 ・= SIF
'Circuit, 9...VTR+body (+knee 1-inside #:)
, 10...Signal switching anode switch, 11, 1
2... L transistor for switching newsletters, 13゛°° recording monitor switch, 14... VT [(channel lock transistor) during recording, 15... Signal to R, 16... I- '
LA Y signal, 17, 18... Signal switching control signal, 19'... TV video signal 20... TV audio signal, 21 ゛v'rR video signal, 22 ・= VTR
Audio signal, 23...Video signal amount 24...Audio signal output, R1-R4...Resistor, VCC...
11 current power supply, SW1 to SW4...signal changeover switch,
Patent applicant: Susumu Ito, agent of Tokyo Shibaura Electric Co., Ltd.

Claims (2)

[Claims] (1) A device for recording and reproducing television signals on the basis of reception, including a channel selection switch having a switch corresponding to a plurality of channels, and a television receiver ('I) connected to each of the channel selection switches. ”V) side channel selection circuit, VTRII channel selection circuit, and the signal k of the channel selected by the TV side channel selection circuit.
It is possible to record the signal of the channel selected by the means for outputting it as a signal on the TV side and the channel selection circuit on the VTR side, and to generate a playback signal by operating the playback operation switch. A VTR that outputs a VTR side signal, a signal switching means for manually inputting the TV side signal and the VTR side signal and selectively outputting one of the signals, and an output signal from the signal switching means. means for displaying on the picture tube; detecting means for detecting the operation when any of the channel selection switches is operated; The second one is used except during operation.
binary state signal generating means for generating a state signal; and means for controlling the signal switching means, the means being connected to the detecting means and the binary state signal generating means to generate the second state signal. During the period when the TV111 signal is output from the signal switching means, during the period when the signal in the first state is generated, all the signals on the vTtt side are output from the signal switching means, and when the channel selection switch is operated, the TV111 signal is output from the signal switching means. The signal switching means is fully equipped with control means for controlling all of the signal switching means so that the TV side signal w+i11 signal distribution switching means is output based on the signal from the detection means. equipment for living. (2) The detection means comprises a first line that is grounded, a second line that is connected to the control means, and a switch that moves between these two lines in conjunction with the operation of the channel selection switch; The control means has a base connected to the second line of the detection means and the binary state signal generation circuit 71. The television device according to claim 1, further comprising a transistor, and the signal switching means is entirely controlled by an output of the transistor and an output obtained by inverting the output of the transistor. ; device for receiving, recording and reproducing images;