KR890001870B1 - Multi-video channel television - Google Patents

Abstract

The TV shows simultaneously two pictures from different channels on a screen. The resolutions of each channel do not drop by operating vertical synchronous signals and switching video signals of each channel alternatively. The pictures of each channel do not overlap so that main and sub channel pictures appear completely with high resolution.

Description

Video multichannel tv

1 is an explanatory diagram showing the overall configuration of the present invention.

2 is a waveform timing chart for explaining the gist of the present invention.

FIG. 3 is an explanatory diagram showing a conventional third (a) and a third screen (b) of the present invention. FIG.

* Explanation of symbols for main parts of the drawings

1, 2: main channel and sub channel tutors 3, 4: intermediate frequency amplifier and detector

5, 6, 9, 15, 19, 20, 21: Electronic switch 7: Vertical synchronous signal separator

8, 18: vertical synchronous signal oscillation drive circuit 10: vertical deflection amplifier

16, 17: Inverter 12: D flip flop

13, 14: monostable multivibrator 22: transistor

27, 28: Speech intermediate frequency amplification detection and low frequency amplifier

29: Horizontal Sync Signal Separation and Oscillator

30: chroma image amplifier 31: flip flop

32: image amplifier circuit vertical blanking 33: horizontal output circuit

Ry: Relay

The present invention relates to an image multi-receiver that allows two broadcast channels to be simultaneously viewed with one receiver screen. The resolution of any one of the two channels to be watched is not degraded and the screen is not overlapped. Efficient configuration is simplified configuration.

Conventionally, a screen of another broadcasting channel is displayed at one lower part of the screen so that two broadcasting channels can be simultaneously viewed on one screen. Digital signal) and the digital signal obtained from this is stored in RAM, and then accessed as a control signal (Access) and converted into an analog signal through the D / A converter so that it can be included in the video signal of the main channel. This single receiver can be displayed on the screen, which requires many components such as A / D and D / A converters, a considerable amount of memory, and a control unit to control each part of the circuit, which is very expensive. Subsequently, the overall manufacturing cost of the receiver was not only increased, but the power consumption was large, and the failure rate was high. In addition, since the subchannel screen is reduced and overlapped with a part of the main channel screen, the resolution of the subchannel becomes very low, whereas one side of the main channel screen cannot be viewed at all, and thus the conventional video is displayed. Multiple receivers have not been widely used because of the problem that both the primary, secondary, and two channels have defects.

The present invention manipulates the vertical synchronization signal and alternately switches the two channel video signals in order to solve the problems of the conventional video multiple receiver as described above. When it is described in detail according to the accompanying drawings to be shown on the receiver screen as follows.

에 콘덴서(C₄) 및 저항(R₆)과 수직 동기 신호 발진 드라이브 회로(18)를 연결하며, 수직 동기 신호 발진회로(8)(18)과 수직 동기 신호 증폭기(10), 영상증폭 회로 수직블랭킹(32)사이에 각기 전자 스위치(9)(19)(20)(21)을 접속하고, D플립플롭(12)의 출력단자(Q)에는 저항(R₃) 콘덴서(C₂) 및 단안정 멀티 바이브 레이터(Mono-Stable Multivibrator)(13)를 연결하고 그 출력에 콘덴서(C₃) 및 저항 (R₄)그리고 또 다른 단안정 멀티 바이브 레이터(14)를 연결하며, 중간주파 증폭 및 검파기(3)(4)와 수평동기 신호 분리 및 발진증폭기(29), 크로마 영상 증폭기930)사이에 접속된 전자 스위치(5)(6)와 이를 제어하기 위한 콘트를 단자에 연결된 반전기(17), (16)에 상기의 단 안정 멀티 바이브 레이티(14)의 출력이 전자 스위치 (15)르 거쳐서 인가되게 하며, 수평 출력 회로(33)에 연결된 수평편향 코일(L₀) 및 진폭 조절 코일(L₁)(L₂)의 접속이 직, 병렬로 절환될 수 있도록 트랜지스터(22)에 의하여 작동되는 리레이(Ry)의 접점(S₁)(S₂)에 연결하고, 스위치(R)(S)를 갖는 플립플롭(31)의 출력단자(F)를 전자 스위치(15)(19)(21)의 콘트롤 단자와 트랜지스터(22)의 베이스에 연결하고 아울러 음성 중간 주파 증폭검파 및 저주파 증폭기(28)에 연결하며, 다른 출력단자(G)를 전자 스위치(9)(20)의 콘트를 단자에 연결하여서 된 것으로 미설명 부호 34, 34'는 스피커이다.The outputs of the main channel tuner (1) and the subchannel tuner (2) are amplified and detected by the intermediate frequency amplification and detector (3) (4) and then input to the speech intermediate frequency amplification, detection and low frequency amplifiers (27) (28). It is also input to the horizontal synchronous signal separation and oscillation amplifier 29, the chroma image amplifier 30 connected to the CRT (Cathode Ray Tube), and also to the vertical synchronous signal separator 7, the output of which is vertical synchronous The signal is applied to the signal oscillation drive circuit 8, and the vertical blanking signal obtained at this time is input to the image amplifying circuit vertical blanking 32, and the vertical drive signal is known to be amplified by the vertical deflection amplifier 10. The output signal obtained from the vertical synchronizing signal separator 7 is applied to the clock terminal CK of the D (Delay) flip-flop 12 through the capacitor C ₁ and the resistor R ₂ and the inverter 11. Output terminal of the flip-flop 12

Connect the capacitor (C ₄ ) and the resistor (R ₆ ) with the vertical synchronization signal oscillation drive circuit (18), and the vertical synchronization signal oscillation circuit (8) (18), the vertical synchronization signal amplifier (10), and the image amplification circuit Electronic switches 9, 19, 20, and 21 are respectively connected between the blanking 32, and the output terminal Q of the D flip-flop 12 has a resistor R ₃ capacitor C ₂ and a stage. Connect a mono-stable multivibrator (13) and connect a condenser (C ₃ ) and a resistor (R ₄ ) and another monostable multivibrator (14) at its output, and an intermediate frequency amplification and detector (3) (4), an electronic switch (5) (6) connected between the horizontal synchronous signal separation and oscillation amplifier (29), the chroma image amplifier (930), and an inverter (17) connected to the terminal for controlling the same. A horizontal piece connected to the horizontal output circuit 33 so that the output of the above monostable multivibration 14 is applied via an electronic switch 15 to A coil (L ₀₎ and an amplitude control coil (L ₁₎ Contact point (S ₁₎ of the relay (Ry), which is connected to the (L ₂₎ operated by a transistor 22 to be switched to the straight, parallel (S ₂ ) And the output terminal F of the flip-flop 31 having the switches R and S to the control terminals of the electronic switches 15, 19 and 21 and the base of the transistor 22. In addition, it is connected to the voice intermediate frequency amplification detection and low frequency amplifier 28, and another output terminal (G) by connecting the control of the electronic switch (9) 20 to the terminal, reference numerals 34 and 34 'are speakers. .

The operation and effects of the present invention as described above will be described in detail below. First, when a channel is to be received by a receiver according to the present invention, the power switch (not shown) is turned on to supply power to each part, and then simply press the switch S. That is, when the switch S is pressed, the output terminal F is "OFF" because the "0" level signal is applied, and the transistor 22 is turned OFF, and the voice intermediate frequency amplification detection and the low frequency amplifier 28 The "1" level signal of the output terminal G turns "ON" the electronic switch 20 and 9, and the power supply to the intermediate frequency amplifier detection and the low frequency amplifier 28 are cut off. Of course, the base voltage of the amplifier transistor can be manipulated to render it inoperable.

Therefore, as long as the outputs of the primary and subchannel tuners 1 and 2 reach the intermediate frequency amplification and detectors 3 and 4, the output of the inverted 16 to the " OFF " In the "1" state, only the output of the intermediate frequency amplification and detector 3 can pass through the electronic switch 5, and the output of the inverter 17 is in the "0" state so that the electronic switch 6 is "OFF". The output of the intermediate frequency amplification and detector 4 is cut off, and only the voice intermediate frequency amplification detection and the low frequency amplifier 27 are operated so that only the voice of the main channel broadcast comes out to the speaker 34, The output detected by the vertical synchronizing signal separator 7 is input to the vertical synchronizing signal oscillation drive circuit 8, and the vertical blanking output obtained here is an image amplifying circuit via the electronic switch 20 in the " ON " state as described above. Electronic input to the vertical blanking 32, the vertical drive signal is also in the "ON" state Will be through a position (9) inputted to the vertical deflection amplifier 10, transistor 22 is cut-off state because relay (Ry) is not a current flow through the contact point (S _1), only the "ON" In the amplitude adjustment The coil L ₂ is short-circuited so that only the horizontal deflection coil L ₀ is connected to the horizontal output circuit 33, and the intermediate frequency output passing through the electronic switch 5 is a horizontal synchronous separation and oscillation amplifier 29. ) And at the same time it is also input to the chroma image amplifier 30 is sufficiently amplified and then input to the CRT as a video signal to finally obtain a screen to enjoy the broadcasting of one channel such as a universal receiver.

In such a state, if the user wishes to watch the video in a video mode, only the switch R of the receiver according to the present invention needs to be pressed. That is, when the switch (R) is pressed, the switch (S) is interlocked and becomes "OFF", and only the switch (R) is turned "ON". Therefore, the output terminal (F) of the flip-flop (31) has a state of "1". An output signal is generated and applied to the control terminals of the electronic switches 15, 19, and 21 to be in the " ON " state. The voice intermediate frequency amplification detection and the low frequency amplifier 28 are in an operating state and the transistor 22 Is turned on and the output terminal G outputs an output signal of " 0 " state so that the electronic switch 9, 20 is changed to " OFF ".

Therefore, as described above, the output signal obtained from the intermediate frequency amplification and detector 3 is input to the vertical synchronizing signal separator 7, and the output terminal shows the vertical synchronizing signal waveform as shown in FIG. 2 (a). The signal waveform is differentiated by the condenser C ₁ , and is inverted in the inverter, applied to the clock terminal CLK of the D flip-flop 12, and divided into a vertical synchronous signal waveform 1/2 at the output terminal Q. The output waveform appears in the form, which is shown in Figure 2 (b).

The waveform at this time naturally has a frequency of 30 Hz and the output waveform is differentiated again in the capacitor C ₂ and the resistor R ₃ to become the waveform shown in the second (c) diagram, which is applied to the monostable multivibrator 13. The pulse duration time of the monostable multivibrator 13 is about 15.5 ms, which is applied to the trigger voltage, which is a square wave synchronized with the differential waveform of FIG. 2 (c). Derived from (C ₃ ) and resistor R ₄ to form a differential waveform with downward spikes as shown in FIG. 2 (e) and applied to the monostable multivibrator 14 as a secondary trigger voltage at this time. The pulse duration of the vibrator 14 is about 16.03 ms, so that a square wave as shown in Fig. 2 (f) is obtained, and "1" is output to the output terminal F at the moment the switch R is pressed for image multi-image. "The output of the level foot As the electronic switch 15 is already “ON”, the output waveform as shown in FIG. 2 (f) is applied to the inverter 16, and the output is inverted and shown in FIG. 2 (g). A continuous square wave with a pulse duration of about 17.3 ms is obtained.

에서는 제2(b)도의 반대위상을 가진 출력파형이 얻어지는 콘덴서(C₄) 및 저항(R₆)에 의하여 미분된 파형은 제2(i)도에 보인 것과 같은 전압 파형이 얻어진다.Since the control of the electronic switch 5 is applied to the terminal, the electronic switch 5 is "ON" for 17,3 ms and "OFF" for about 16.03 ms, and the control of the electronic switch 6 is connected to the terminal for a second (h). Since the voltage waveform as shown in the figure is supplied by the inverter 17, the electronic switch 6 is "ON" for about 16.03 ms and "OFF" for about 17.3 mg, so that the electronic switches 5 and 6 alternate. So that the output signals of the intermediate frequency amplification and detectors 3 and 4 of the main channel and the subchannel are alternately in the horizontal synchronization signal separation and oscillation amplifier 29 and the chroma image amplifier 30. The video output is sent to the CRT, and the audio is input. In the mid-frequency amplification detection and low-frequency amplifiers 27 and 28, the audio output of the main and sub-channels is obtained so that two channels of audio flow out through the speakers 34 and 34 ', while the D flip-flop (12) ) Reverse output

In Fig. 2, the waveform differentiated by the capacitor C ₄ and the resistor R ₆ from which the output waveform having the opposite phase of Fig. 2 (b) is obtained is obtained with the voltage waveform as shown in Fig. 2 (i).

This is applied to the vertical synchronizing signal oscillation drive circuit 18 and the vertical synchronizing signal output waveform becomes a saw tooth wave having a frequency of 30 Hz as shown in FIG. 2 (j). The reason why the signal is needed is as follows. That is, although the general vertical synchronization signal is 60 Hz, the present invention provides a video signal in which the video signals of the main channel and the subchannel are continuously switched as shown in the second (g) and second (h) diagrams in synchronization with the vertical synchronization signal. Since the vertical synchronization signal frequency is lowered to 30 Hz, the period should be doubled to allow the main and sub channel video signals to be applied to the CRT during one vertical deflection time. The output waveform of FIG. 2 (j) obtained in FIG. 18 is " ON " as the electric switch 19 is electric, so it is input to the vertical deflection amplifier 10 and amplified, and then the vertical deflection coil (not shown). And the blanking output of this 30Hz vertical sync signal is input to the image amplifying circuit vertical blanking 32 via an electronic switch 21 that is "ON" to perform a vertical blanking function. Which would be, at this time that the electronic switch 20, 19 is "OFF", the output terminal (G) at an output of "0" level state. FIG.

In this case, the screen of the housewife channel is reduced to about 1/2 of the vertical screen as shown in FIG. As a function of this, the transistor 922 is also in the conduction state by the output terminal F, so that a current can flow to the ring Ry, therefore, the contact S ₁ is "OFF" and the contact S ₂ is "ON". At this time, if the deflection coil value is L ₀ and L ₁ ≒ 2.41L ₀ , L ₂ ≒ 0.29L ₀ , the total value is the same as L ₀ , and only the current flowing through the deflection coil L ₀ is about 1 / of the total current. Raster width is reduced to about 1/2. For this reason, the width of the horizontal raster is reduced to about 1/2, so that the video signal of the primary and subchannels is alternately supplied to the CRT in synchronization with the vertical synchronization signal of 60 Hz, and the horizontal deflection coil is applied. Since the width of the horizontal raster is halved by the inspection of the current flowing in the current, the screen as shown in FIG. 3 (b) can be obtained.

In addition, the state in which the main channel and the subchannels are arranged on the upper and lower screens in detail will be described with reference to FIG. 2. The vertical oscillation waveform of the sawtooth voltage (FIG. 2 (j)) is the pulse train of FIG. 2 (a). It can be seen that it is synchronized with t ₂ , t ₄ , t ₆ , and t _8, and it is confirmed that this is exactly synchronized with the square waveform shown in FIG. 2 (g) and FIG. 2 (h). That is, in the period t _1- t ' _{1 of} FIG. 2 (g), the electronic switch 5 is turned “ON” so that the video signal of the main channel is transmitted. This part is up to mn of the sawtooth waveform of FIG. 2 (j). In the period t ' _1- t' _{2 of} FIG. 2 (h), the electronic switch 6 is turned "ON" so that the video signal of the subchannel is transmitted, and this part is the sawtooth waveform of FIG. During the vertical deflection time up to mn, this is the time to be scanned on the upper part of the lower surface of the video signal of the main channel. During the vertical deflection time up to nm, the video signal of the sub-channel is scanned on the lower part of the screen. As shown in FIG. 3 (b), the screen by the sub-channel is positioned below the two channels at the upper side as shown in FIG.

In addition, since video multi-viewing according to the present invention can be regarded as using the timing of the vertical synchronization signals of the two broadcasts to be viewed, the timing is important. Since there was a difference of about 30MS, the timing of the vertical synchronization signal was almost identical, and it was confirmed that this error was not a problem in practical use.

In this way, the multi-image receiver according to the present invention reduces the resolution of the subchannels excessively so that the resolution is not reduced so that a part of the upstream screen is not overlapped so that one side cannot be seen. As it is possible to see, the structure is very simple and does not use expensive parts, it is not only the production cost is low, but also the failure rate is very small, and it is possible to reduce the power consumption, which is widely available.

Claims (1)

The outputs of the main channel tuner (1) and the subchannel tuner (2), and the intermediate frequency amplification and detector (3) (4) are fed to the audio intermediate frequency amplification detection and low frequency amplifiers (27) (28) and the horizontal synchronization signal separation and oscillation amplifiers (29), to the chroma image amplifier 30 and the vertical synchronous signal separator 7 so that the output of the vertical synchronous signal separator 7 is input to the vertical synchronous signal oscillation drive circuit 8, and the output terminal amplifies the image. In the well-known thing which connected the circuit vertical blanking 32 and the vertical deflection amplifier 10, the output signal of the said vertical synchronous signal separator 7 is differentially applied to the D flip-flop 12, and its output terminal. In (Q), the output waveform divided by 1/2 is obtained and differentiated again and applied to the monostable multivibration 13, and the output waveform is differentiated again to the monostable multivibrator 14 and applied to the output terminal. Electronic switch 15 and inverter 16, 17 Hitting the inverted output terminal of the intermediate frequency amplifier and a detector (3) (4) an electronic switch (5) connected to a contrail of (6) to the terminal, the D flip-flop 12 is connected to the output of

Differentiates the output of the signal and applies it to the vertical synchronizing signal oscillation drive circuit 18 and between the vertical synchronizing signal oscillation drive circuit 8 and 18 and the image amplifying circuit vertical blanking 32 vertical deflection amplifier 10. The horizontal deflection coils L ₀ and the amplitude adjustment coils L ₁ and L ₂ connected to the horizontal output circuit 33 are connected in parallel and in parallel with each other. Connected to the contact S ₁ (S ₂ ) of the relay Ry operated by the transistor 22 so as to be switched to, and the output terminal of the flip-flop 31 having the switch R (S) ( F) connects the controls of the electronic switches 15, 19, 21 to the terminals and the base of the transistor 22, and also to the voice intermediate frequency amplification gum and the low frequency amplifier 28, and the other output terminal (G). Video multi-channel television by connecting the controls of the electronic switches (9) and (20) to terminals.

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