JPH08163595A - Video signal multiplex transmitter - Google Patents

Abstract

PURPOSE: To transmit separate carrier wave signals by one signal line by modulating and multiplexing the signals by each signal of video, voice, display panel part control, a remote controller, etc., to be supplied to a display panel part. CONSTITUTION: A G signal and a synchronizing signal, R, B signals and a voice signal are modulated in an FM modulation part 2, an FM modulation part 4 and an FM modulation part 6, respectively. In an AM modulation/multiplex part 7, an AM modulation is performed for the signal from the FM modulation part 6 by a control signal 9. Each of these carrier waves of different frequencies is mixed in a mixer 11 and the mixed one is transmitted from a signal processing unit A to a display panel unit part B by a signal line 12. The G signal and the synchronizing signal and the R, B signals are demodulated in an FM demodulation part 14 and FM demodulation parts 19 and 22, respectively, the signals are amplified to required signal levels in amplifiers 16, 20 and 23, digital conversions are performed for the signals in A/D conversion parts 17, 21 and 24, the signals are impressed on a display panel part 18, a synchronization is performed by the synchronizing signal from a synchronizing separation part 15 and video is displayed. A voice signal is demodulated in an FM demodulation part 27, the signal is demodulated into a stereo signal in a stereo demodualtion part 28, the signal is impressed on a speaker 30 via an amplifier 29 and voice is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal multiplex transmission apparatus, in which R (red), G (green), B (blue) video signals, sync signals and audio signals are used as FM carrier signals.
(Frequency modulation), multiplexing, and transmitting by one transmission path.

[0002]

2. Description of the Related Art Plasma display panels (PDPs)
A device in which a display panel unit that uses the above is separated into a signal processing unit that performs signal processing for displaying on the display panel unit, and the two units are connected by a signal transmission line. Since it can be configured to be thin, for example, the display panel unit can be installed on a wall surface or the like, and the signal processing unit can be installed at a distant place and operated, which is convenient. However, when a color image is displayed on the display panel, for example, as shown in FIG.
G and B color video signals, sync signals (horizontal sync signals,
A total of 26 signal lines are required for the vertical sync signal and the signal indicating the odd / even field), the control signal for controlling the PDP, and the remote control (hereinafter abbreviated as remote control) (in addition to this). Not only is it necessary for a power supply) and the signal lines become a thick bundle to impair the appearance, but especially the video signal has a problem that the frequency characteristic deteriorates when it is routed over a long distance in the baseband.

[0003]

SUMMARY OF THE INVENTION In view of the above, the present invention has been made in view of the above points.
The purpose is to modulate an appropriate carrier wave signal with a signal for DP control, superimpose it, and transmit what was conventionally transmitted using 26 signal lines by one signal line.

[0004]

In order to solve the above-mentioned problems, the present invention is directed to a signal processing unit for processing video signals and audio signals separated into red, green and blue color signals, and a signal transmission line. And a display panel unit section which is connected to the signal processing unit section through the display panel to display on the display panel based on a signal from the signal processing unit section and to output a sound. A first FM modulator that frequency-modulates a carrier signal with a green video signal on which a horizontal sync signal and a vertical sync signal are superposed, and a second carrier signal that has a frequency different from that of the first carrier signal is frequency-modulated with a red video signal. The second FM modulation section, and the third FM modulation for frequency-modulating a third carrier signal having a frequency different from that of the first carrier signal and the second carrier signal with a blue video signal. And a fourth FM modulator for frequency-modulating a fourth carrier signal having a frequency different from those of the first carrier signal, the second carrier signal and the third carrier signal with an audio signal, and a frequency deviation from the display panel unit. An FSK demodulation unit for demodulating the transmodulated fourth carrier signal;
A control section for generating a control signal for controlling the display panel based on the signal from the K demodulation section; and an AM modulation / multiplex section for amplitude-modulating the signal from the control section and multiplexing it with the signal from the fourth FM modulation section. , The first FM
Signal from modulator, signal from second FM modulator, third F
And a mixer for mixing a signal from the M modulator and a signal from the AM modulator / multiplexer and sending the mixed signal through a signal transmission line,
A distributor for distributing the signal from the mixer, a first FM demodulator for demodulating the signal from the first FM modulation distributed by the distributor, and the second F to the display panel unit.
A second FM demodulator for demodulating the signal from the M modulator, a third FM demodulator for demodulating the signal from the third FM modulator, and a horizontal sync signal and a vertical sync signal by the signal from the first FM demodulator. A signal from the fourth FM modulator, a sync separator for separating, an AM demodulator for demodulating a signal amplitude-modulated by the signal from the AM modulator / multiplexer, and a signal from the AM modulator / multiplexer. And a fourth FM demodulation unit for demodulating the
The display panel is controlled by the signal from the AM demodulation unit so that the display is performed based on the signals from the first FM demodulation unit, the second FM demodulation unit, and the third FM demodulation unit, and the sound is generated based on the signal from the fourth FM demodulation unit. And a remote control signal light receiving section for receiving a remote control signal and a fifth carrier signal having a different frequency from the first carrier signal, the second carrier signal, the third carrier signal and the fourth carrier signal. A video signal multiplex transmission device is provided, which is provided with an FSK modulation unit that frequency-shift-modulates a carrier signal with a signal from a remote control signal light receiving unit and sends the signal from the FSK modulation unit through the distributor through the signal transmission line. It is provided.

[0005]

With the above construction, in the video signal multiplex transmission apparatus according to the present invention, the R, G and B color video signals (including the sync signal), the audio signal and the PDP are used in the signal processing unit section. Carrier signals of different frequencies according to the control signal for controlling the FM.
The signals are modulated or AM-modulated, mixed, and transmitted to the display panel unit section through one signal transmission line. The display panel unit separates the mixed signals, demodulates each, synchronizes with the demodulated sync signal, and controls the display panel with the control signal so that the signals are displayed based on the R, G, and B color signals. Then, the demodulated voice signal is output as voice. Further, a remote control signal receiving section is provided in the display panel unit section, a carrier signal having a frequency different from that of each carrier signal is FSK modulated, transmitted to the signal processing unit section through the signal transmission line, FSK demodulated and demodulated. The control signal is generated based on the signal.

[0006]

Embodiments of the video signal multiplex transmission apparatus according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of essential parts of a video signal multiplex transmission apparatus according to the present invention.
In the figure, (a) is a signal processing unit section, and (b) is a display panel unit section. Signal processing unit section (a)
1 is a sync signal superimposing unit that superimposes a horizontal sync signal (H) and a vertical sync signal (V) on a G signal, 2 is an FM modulator that frequency-modulates the signal from the sync signal superimposing unit 1, and 3 is an R signal. An FM modulator that frequency-modulates, 4 an FM modulator that frequency-modulates a B signal, 5 a matrix unit that matrixes R (right) and L (left) audio signals, and 6 a matrix unit 5
An FM modulator for frequency-modulating the signal from the FM modulator, an AM modulator / multiplexer for amplitude-modulating the signal from the FM modulator with the control digital data 9 and multiplexing, and a control unit for generating the control digital data 9. 10 is the FS of the remote control signal from the display panel unit (B)
A remote control signal FSK demodulator for frequency shift demodulating a K modulated wave, 11 is a mixer, and 12 is a signal transmission line.

In the display panel unit (b), 13 is a distributor, and 14 is an F for demodulating the frequency modulated wave from the FM modulator 2.
An M demodulation unit, 15 is a sync separation unit that separates a horizontal synchronization signal and a vertical synchronization signal from a signal from the FM demodulation unit, 16 is an amplifier, and 17 is an A / D that converts the R signal from the amplifier 16 into a digital signal. A conversion unit, 18 is a display panel unit, 19 is an FM demodulation unit that demodulates the frequency modulation wave from the FM modulation unit 3, 20 is an amplifier, 21 is an A / D conversion unit, and 22 is a frequency modulation wave from the FM modulation unit 4. FM demodulation section for demodulating the signal, 23 is an amplifier, 24 is an A / D
It is a conversion unit. Reference numeral 25 is an AM demodulation unit that demodulates the amplitude modulation wave from the AM modulation / multiplexing unit 7, 26 is a control unit that controls the display panel unit 18 based on the control digital data demodulated by the AM demodulation unit 25, and 27 is FM modulation. An FM demodulation unit for demodulating the frequency-modulated signal in the unit 6, 28
Is a stereo demodulation unit that demodulates the signal from the FM demodulation unit 27 into a stereo audio signal, 29 is an amplification unit, 30 is a speaker, 31 is a remote control signal light receiving unit, and 32 is a frequency shift keying signal from the remote control signal light receiving unit 31. FSK modulator.

Next, the operation of the video signal multiplex transmission apparatus according to the present invention will be described. The horizontal synchronizing signal (H) and the vertical synchronizing signal (V) are superimposed on the G signal by the synchronizing signal superposing section 1 of the signal processing unit section (a) and input to the FM modulating section 2, and as shown in FIG. , A 240 MHz carrier signal is FM-modulated, and at the same time, an R signal is an FM modulator 3 and a B signal is an F signal.
Each of them is input to the M modulator 4 and, as shown in FIG. 2, a frequency different from the carrier signal, for example, 308 MHz and 376M.
Each of the carrier signals of Hz is FM-modulated. Each FM modulator aligns the signal levels so that the carrier signals are frequency-shifted by a width of 48 MHz, for example. Therefore, in the FM modulator 2, the total of the G signal and the composite sync signal is
The signal level is compressed compared to the R signal etc. so that the width is 48 MHz. This is because the same component can be used in each demodulation circuit by making the frequency shift width of each modulated wave the same. Then, the composite synchronizing signal is arranged so as to be on the low frequency side of the carrier wave signal, and the G signal is frequency-modulated so that it is less likely to be affected by an audio signal described later.

The stereo audio signals (R, L) are input to the matrix section 5, are matrixed into L + R and LR, and are input to the FM modulation section 6, and as shown in FIG. 2, the above carrier signals (240 MHz, (308 MHz and 376 MHz), for example, a carrier signal having a frequency of 77 MHz is FM-modulated.
Further, in the AM modulation / multiplexing unit 7, digital data 9 for controlling the display on the display panel, that is,
Data generated by the control section 8 based on the remote control signal sent from the display panel unit section (b) described later and demodulated by the remote control signal FSK demodulation section 10 is input, and the FM modulated wave from the FM modulation section 6 is input. (77MHz) A
M-modulate. Then, the signals from the FM modulator 2, the FM modulator 3, the FM modulator 4, and the AM modulator / multiplexer 7 are mixed by the mixer 11, and sent to the display panel unit (B) by the signal transmission line 12. At the same time, the FSK modulation signal input from the display panel unit (B) is input to the remote control signal FSK demodulation unit 10.

The signal transmitted to the display panel unit section (b) through the signal transmission line 12 is sent to the FM demodulation section via the distributor 13.
14, FM demodulation unit 19, FM demodulation unit 22, AM demodulation unit 25, and FM demodulation unit 27. The FM demodulation unit 14 demodulates the G signal on which the sync signal is superimposed from the FM modulated wave (240 MHz) from the FM modulation unit 2, the sync separation unit 15 separates the horizontal sync signal and the vertical sync signal, and the G signal is amplified. The signal is amplified to a proper signal level at 16 and input to the A / D conversion section 17 to be converted into a digital signal.
The R signal is demodulated from the modulated wave (308 MHz), amplified to an appropriate signal level by the amplifier 20, input to the A / D conversion unit 21 and converted into a digital signal, and the FM demodulation unit 22 causes the FM modulation unit 4 to operate. The B signal is demodulated from the FM modulated wave (376 MHz), amplified by the amplifier 23 to an appropriate signal level, and converted into a digital signal by the A / D converter 24. The G signal from the A / D converter 17, the R signal from the A / D converter 21, and the A / D
The B signals from the conversion unit 24 are applied to the display panel unit 18, respectively, and the video is displayed in synchronization with the synchronization signal from the synchronization separation unit 15.

Adjustment of an image on the display panel section 18 is performed by a remote control device (not shown) or the like. A signal such as infrared rays from the remote control device is received by the remote control signal light receiving unit 31, converted into an electric signal, and input to the FSK modulation unit 32, and a carrier signal of a frequency different from each of the carrier signals, for example, 74 MHz. Is frequency shift modulated. The signal from the FSK modulation section 32 is sent to the signal processing unit section (a) through the signal transmission line 12 through the distributor 13, and the remote control signal FS is transmitted through the mixer 11.
It is input to the K demodulation unit 10 and demodulated. The demodulated signal is input to the control unit 8 to operate, for example, brightness adjustment, contrast adjustment, switching between NTSC video and personal computer video, and panel display on / off.
A corresponding control signal is generated based on a remote control signal such as OFF, and is input to the AM demodulation unit 25 through the AM modulation / multiplexing unit 7, mixer 11, signal transmission line 12 and distributor 13 for demodulation, Display panel section 18 via control section 26
Control.

The FM modulation wave from the AM modulation / multiplexing unit 7 is demodulated into R + L and RL by the FM demodulation unit 17, and the stereo demodulation unit 28 demodulates into R and L stereo voice signals.
It is appropriately amplified by the amplifier 29, input to the speaker 30, and outputs stereo sound.

[0013]

As described above, according to the video signal multiplex transmission apparatus of the present invention, it is possible to provide a single signal transmission line between the signal processing unit section and the display panel unit section. , G, B color video signals (including synchronization signals), audio signals, display video control signals, remote control signals, etc. are transmitted, so the installation location of the display panel unit can be set freely, and multiplex transmission is possible. It does not cause interference such as interference and interference between signals.

[Brief description of drawings]

FIG. 1 is a block diagram of essential parts of an embodiment of a video signal multiplex transmission device according to the present invention.

FIG. 2 is a diagram for explaining multiplexing of video signals according to the present invention.

FIG. 3 is a schematic diagram of an example of a conventional video signal multiplex transmission device.

[Explanation of symbols]

 B. Signal processing unit B. Display panel unit 2 FM modulator (G signal, sync signal) 3 FM modulator (R signal) 5 FM modulator (B signal) 6 FM modulator (voice signal) 7 AM modulation / multiplexing Part 10 Remote control signal FSK demodulation part 11 Mixer 12 Signal transmission line 13 Distributor 14 FM demodulation part (G signal, sync signal) 15 Sync separation part 17 A / D conversion part 18 Display panel part 19 FM demodulation part (R signal) 21 A / D converter 22 FM demodulator (B signal) 24 A / D converter 25 AM demodulator 27 FM demodulator (voice signal) 32 FSK modulator (remote control signal)

Claims (5)

[Claims] 1. A signal processing unit section for processing a video signal, an audio signal, etc. separated into red, green and blue color signals, and a signal processing unit section connected to the signal processing unit section via a signal transmission line. And a display panel unit section that outputs a sound on the display panel based on the signal of, in the signal processing unit section,
A first FM modulator that frequency-modulates a first carrier signal with a green video signal on which a horizontal sync signal and a vertical sync signal are superimposed, and a second carrier signal with a red video signal that has a frequency different from that of the first carrier signal. A second FM modulating unit that frequency-modulates; a third FM modulating unit that frequency-modulates a third carrier signal having a frequency different from that of the first carrier signal and the second carrier signal with a blue video signal; a first carrier signal; A fourth FM modulator that frequency-modulates a fourth carrier signal having a frequency different from that of the second carrier signal and the third carrier signal with an audio signal, and amplitude-modulates a fourth control signal for controlling the display panel. AM multiplexed with the signal from the department
A modulator / multiplexer, a signal from the first FM modulator, a second
A mixer for mixing a signal from the FM modulator, a signal from the third FM modulator, and a signal from the AM modulator / multiplexer and sending the mixed signal through a signal transmission line is provided, and the mixer is provided in the display panel unit. A first FM demodulation unit for demodulating the signal from the first FM modulation distributed by the distributor, a second FM demodulation unit for demodulating the signal from the second FM modulation unit, and A third FM demodulation unit that demodulates the signal from the third FM modulation unit, a synchronization signal separation unit that separates a horizontal synchronization signal and a vertical synchronization signal by the signal from the first FM demodulation unit, and an AM modulation / multiplexing unit. An AM demodulation unit that demodulates a signal amplitude-modulated by a signal, and a fourth FM demodulation unit that demodulates the signal from the fourth FM modulation unit with the signal from the AM modulation / multiplexing unit are provided, and the synchronization separation unit is provided. Signal of Synchronized, the first 1FM demodulator,
The display panel is controlled by the signal from the AM demodulator so as to display based on the signal from the second FM demodulator and the third FM demodulator, and the sound is output based on the signal from the fourth FM demodulator. Video signal multiplex transmission device. 2. The signal processing unit section is provided with a matrix section for matrixing a stereo audio signal, and the matrix section is provided.
The FM modulation section frequency-modulates the signal from the matrix section, and the display panel unit section is provided with a stereo demodulation section for demodulating the signal from the fourth FM demodulation section into a stereo audio signal. The video signal multiplex transmission apparatus according to claim 1, wherein the audio signal is output based on the audio signal. 3. The remote control signal light receiving section for receiving a remote control signal, and the first carrier wave signal, the second carrier wave signal, the third carrier wave signal and the fourth carrier wave signal in the display panel unit section. An FSK modulator for frequency-shift-modulating a fifth carrier signal having a different frequency with a signal from a remote control signal light receiver is provided, and the signal from the FSK modulator is sent out through the signal transmission line through the distributor. The signal processing unit section is provided with an FSK demodulation section for demodulating the signal from the FSK modulation section and a control section for generating a control signal for controlling the display panel based on the signal from the FSK demodulation section. 3. The video signal multiplex transmission apparatus according to claim 1 or 2, wherein said signal is amplitude-modulated by said AM modulation / multiplexing section. 4. Each of the carrier signals comprises a fifth carrier signal, a fourth carrier signal, a first carrier signal,
4. The video signal multiplex transmission device according to claim 3, wherein the second carrier signal and the third carrier signal are arranged in this order. 5. The video signal multiplex transmission apparatus according to claim 4, wherein the first FM modulator is arranged to arrange the horizontal synchronizing signal and the vertical synchronizing signal on the low frequency side of the first carrier signal to perform frequency modulation. .