JPH04215690A - Image communication device - Google Patents

Abstract

PURPOSE:To perform correct image communication and communicate the large- capacity image information via a device with a small circuit scale. CONSTITUTION:The D/A converter circuit 1 of a transmission section 40 allocates the R signal, G signal and B signal to one bit respectively and converts them into analog signals, a composite synchronizing signal circuit 7 synthesizes the horizontal synchronizing signal and the vertical synchronizing signal into the composite synchronizing signal, an adder circuit 3 synthesizes the composite synchronizing signal and analog signals of the R signal, G signal and B signal, a synthesizer circuit 4 synthesizes the added result and the reference signal, and the image information signal is generated and transmitted. The synchronizing signal separating circuit 17 of a reception section 60 separates the horizontal synchronizing signal and the vertical synchronizing signal from the received image information signal, an A/D converter circuit 12 extracts the R signal, G signal and B signal and converts them into digital signals, and clock signal generating means 13-16 generate the sampling signal and clock signal.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention is applied to an image communication device for image communication. In particular, the present invention relates to an image communication device that communicates digital image information.

0002

2. Description of the Related Art FIG. 2 is a block diagram of a conventional image communication apparatus.

[0003] Conventionally, image communication devices have been equipped with R signals (red), G signals,
Digital image information of signal (green), B signal (blue), horizontal synchronization signal, vertical synchronization signal, and reference signal (Clock)
When communicating image information signals such as
It was converted into an NTSC signal by a C conversion circuit, converted into an analog signal, frequency-multiplexed with a reference signal, and then subjected to FM modulation and transmitted.

On the receiving side, the FM modulated received signal is demodulated, each image information signal is extracted by an NTSCRGB conversion circuit, and a clock signal is extracted from the demodulated signal by a bandpass filter.

That is, in FIG. 2, in the transmitting section 40A, the RGBNTSC conversion circuit 24 converts the R of the digital signal.
signal (R), G signal (G), B signal (B), horizontal synchronization signal (H.SYNC) and vertical synchronization signal (V.SYNC
) is converted into an NTSC color composite signal, converted into an analog signal, and applied to a synthesis circuit 26 via a low-pass filter 25. The synthesis circuit 26 performs frequency division multiplex synthesis of the NTSC signal and the clock signal to produce a baseband signal. The FM modulation circuit 5 frequency modulates this baseband signal, and the transmission radio high frequency circuit 6 converts it into a radio frequency band and transmits it.

In the receiving section 60A, a receiving radio high frequency circuit 8 converts the received radio high frequency band signal into an intermediate frequency band, and an FM demodulating circuit 9 demodulates it into a baseband signal. The low-pass filter 27 removes the reference signal from the baseband signal, the clamp circuit 28 keeps the DC component constant, and the NTSCRGB conversion circuit 29 extracts the color signal, horizontal synchronization signal, and vertical synchronization signal.

The bandpass filter 30 extracts a reference signal from the demodulated baseband signal, and the waveform shaping circuit 31 extracts a reference signal from the demodulated baseband signal.
and is applied to the display device 70 as a clock signal via the phase adjustment circuit 32.

[0008]

[Problems to be Solved by the Invention] However, in such conventional image communication devices, the R signal, G signal, and B signal are
When converting to SC signals, 3.58MHz is used as a subcarrier and each component of the R signal, G signal, and B signal is represented by the phase difference. If there are frequency components of There was a significant drawback that each component of the signal could not be obtained and accurate image communication could not be performed. Furthermore, when communicating a large amount of image information, there is a drawback that the circuit size becomes large.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned drawbacks, and aims to provide an image communication device that is capable of accurate image communication and that is capable of communicating a large amount of image information using a device with a small circuit scale.

0010

[Means for Solving the Problems] The present invention includes a transmitter and a receiver, and the transmitter receives R signals, G signals, B signals, horizontal synchronization signals, and vertical synchronization signals from image information output means. and a reference signal to output an image information signal, and a transmitting means for transmitting the outputted image information signal to the receiving section, and the receiving section receives the image information signal from the transmitting section. In the image communication apparatus, the combining means includes a receiving means for receiving the image information signal, and an extracting means for extracting a color signal, a horizontal synchronizing signal, a vertical synchronizing signal, and a clock signal from the image information signal from the receiving means and providing it to the display means. The R signal, G signal, and B signal from the image information output means are each assigned one bit and converted into analog signals, which are combined with the horizontal synchronization signal, vertical synchronization signal, and reference signal from the image information output means to generate an image information signal. The extracting means extracts a horizontal synchronizing signal and a vertical synchronizing signal from the image information signal from the receiving means and supplies them to the display means, and the extracting means extracts a horizontal synchronizing signal and a vertical synchronizing signal from the image information signal from the receiving means and provides them to the display means, and A converting means extracts the analog signal from the image information signal from the receiving means, converts it into a digital signal, and provides it to the display means; and a conversion means extracts the reference signal from the image information signal from the receiving means, adjusts the phase, and converts it into a clock signal and sampling. The present invention is characterized in that it includes a clock signal generating means for generating a signal and supplying the signal to the display means and the converting means, respectively.

[0011] Further, in the present invention, the generating means includes a digital-to-analog converting circuit that allocates one bit to each of the R signal, G signal, and B signal from the image information outputting means and converts them into analog signals; a low-pass filter for band-limiting the output signal of the circuit; a composite synchronization signal circuit for synthesizing the horizontal synchronization signal from the image information output means and the vertical synchronization signal to output a composite synchronization signal; an adder circuit that adds the composite synchronization signal and the output signal of the low-pass filter; and a synthesis circuit that combines the output signal of the adder circuit and the reference signal from the image information output means and outputs the resultant signal as an image information signal. including;
The clock signal generating means includes a bandpass filter means for extracting a reference signal from the image information signal from the receiving means, and a second bandpass filter means for adjusting the phase of the output signal of the bandpass filter means and providing a sampling signal to the converting means. The display device may include a phase adjustment circuit and a first phase adjustment circuit that adjusts the phase of the output signal of the bandpass filter means and provides a clock signal to the display means.

0012

[Operation] The synthesizing means is a creating means that allocates each of the R signal, G signal, and B signal from the image information output means to 1 bit and converts them into analog signals, and converts them into analog signals and outputs the horizontal synchronization signal, vertical synchronization signal, and reference signal from the image information output means. The signal is combined with the image information signal to create and output. The extracting means is a synchronizing signal separating means that extracts a horizontal synchronizing signal and a vertical synchronizing signal from the image information signal from the receiving means and supplies them to the display means. Based on the sampling signal input by the converting means, the analog signal is extracted from the image information signal from the receiving means, converted into a digital signal, and provided to the display means. The clock signal generating means extracts the reference signal from the image information signal from the receiving means and adjusts the phase to generate a clock signal and a sampling signal, which are respectively applied to the display means and the converting means.

[0013] As described above, accurate image communication is possible, and a large amount of image information can be communicated with a device having a small circuit scale.

[0014]

Embodiments Examples of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an image communication apparatus according to an embodiment of the present invention. In FIG. 1, the image communication device includes a transmitter 4
0, and a receiving section 60, and the transmitting section 40 serves as an image information output means by synthesizing the R signal, G signal, B signal, horizontal synchronization signal, vertical synchronization signal, and reference signal from the personal computer 50 to generate image information. An FM modulation circuit 5 and a transmitting radio high frequency circuit 6 serve as a combining means for outputting a signal and a transmitting means for transmitting the output image information signal to a receiving section 60.
and an antenna 41, and the receiving section 60 includes a transmitting section 4.
An antenna 61, a receiving radio high-frequency circuit 8, and an FM demodulation circuit 9 serve as a receiving means for receiving the image information signal from the FM demodulation circuit 9, and from the image information signal from the FM demodulation circuit 9, a color signal, a horizontal synchronization signal, a vertical synchronization signal, and a clock signal are used. extracting means for extracting and providing the extractor to the display device 70 .

Here, the feature of the present invention is that the above-mentioned synthesizing means receives the R signal from the personal computer 50,
The extracting means includes a generating means for allocating one bit to each of the G signal and the B signal, converting it into an analog signal, and synthesizing it with a horizontal synchronizing signal, a vertical synchronizing signal, and a reference signal from the personal computer 50 to create and output an image information signal, and the above-mentioned extracting means teeth,
A horizontal synchronization signal and a vertical synchronization signal are extracted from the image information signal from the FM demodulation circuit 9 and the display device 7
A low-pass filter 10 for removing a reference signal, a clamp circuit 11, and a synchronization signal separation circuit 17 are used as a synchronization signal separation means to be applied to F.
The analog signal is extracted from the image information signal from the M demodulation circuit 9, converted into a digital signal, and then sent to the display device 7.
0, a low-pass filter 10 for removing the reference signal, a clamp circuit 11, an analog-to-digital conversion circuit 12, and a reference signal is extracted from the image information signal from the FM demodulation circuit 9, phase adjusted, and converted into a clock signal and sampling. A clock signal generating means for generating a signal and applying the signal to the display device 70 and the analog-to-digital conversion circuit 12, respectively.

[0016] Further, the above-mentioned generating means converts each of the R signal, G signal, and B signal from the personal computer 50 into one
A digital-to-analog conversion circuit 1 that assigns bits to convert into analog signals, a low-pass filter 2 that limits the band of the output signal of the digital-to-analog conversion circuit 1, and synthesizes a horizontal synchronization signal and a vertical synchronization signal from the personal computer 50. a composite synchronizing signal circuit 7 that outputs a composite synchronizing signal, an adding circuit 3 that adds the output composite synchronizing signal and the output signal of the low-pass filter 2; The clock signal generating means includes an FM demodulating circuit 9 and a synthesizing circuit 4 for synthesizing the synthesized signals with a reference signal and outputting the synthesized image information signal as an image information signal.
A band-pass filter 13 and a waveform shaping circuit 14 are used as a band-pass filter means for extracting a reference signal from an image information signal from an analog-to-digital conversion circuit 12 by adjusting the phase of the output signal of the waveform shaping circuit 14.
, and a second phase adjustment circuit 16 that adjusts the phase of the output signal of the waveform shaping circuit 14 and provides a clock signal to the display device 70 .

The operation of the image communication apparatus having such a configuration will be explained.

In FIG. 1, a digital-to-analog conversion circuit 1 allocates one bit to each of the R signal, G signal, and B signal of the digital signal output from the image information of a personal computer 50, converts it into an analog signal, and outputs the converted signal. do. In order to suppress waveform distortion due to the transmission path, the low-pass filter 2 performs band limitation on this analog signal. On the other hand, the composite synchronizing signal circuit 7 combines the horizontal synchronizing signal and the vertical synchronizing signal and outputs it as a composite synchronizing signal.

The adder circuit 3 adds the analog signal and the composite synchronization signal and outputs the result, and the combiner circuit 4 combines the output signal of the adder circuit 3 with the reference signal and outputs the result as a baseband signal. The FM modulation circuit 5 converts this baseband signal into FM
The radio high frequency circuit 6 converts the output signal of the FM modulation circuit 5 into a radio frequency band signal and transmits the signal.

In the receiving section 60, the receiving radio high frequency circuit 8 converts the FM modulated radio frequency band signal from the transmitting section 40 into an FM modulated wave signal of an intermediate frequency band, and the FM demodulating circuit 9 converts the FM modulated radio frequency band signal from the transmitting section 40 into an FM modulated wave signal of an intermediate frequency band. Demodulates the wave signal and outputs a baseband signal. The low-pass filter 10 removes the reference signal component from this demodulated baseband signal, and the clamp circuit 11 converts it into an analog signal with a constant DC voltage component.

The bandpass filter 13 extracts a reference signal from the baseband signal, the waveform shaping circuit 14 shapes the reference signal, and the first phase adjustment circuit 15 and second phase adjustment circuit 16 adjust the phase. Each outputs a sampling signal and a clock signal. The analog-to-digital conversion circuit 12 converts the analog signal into a digital signal using the sampling signal and extracts the R signal, G signal, and B signal of the digital signal.

Further, the synchronization signal separation circuit 17 extracts a horizontal synchronization signal and a vertical synchronization signal from the baseband signal.

The display device 70 displays an image based on the R signal, G signal, B signal, horizontal synchronization signal, vertical synchronization signal, and clock signal.

[0024]

As explained above, the present invention has an excellent effect of being able to perform accurate image communication and communicating a large amount of image information with a device having a small circuit scale.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an image communication device according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of a conventional image communication device.

[Explanation of symbols]

1 Digital-to-analog conversion circuit 2 Band-limiting low-pass filter 3 Adding circuit 4, 26 Synthesizing circuit 5 FM modulation circuit 6 Transmitting radio high-frequency circuit 7 Composite synchronization signal circuit 8 Receiving radio high-frequency circuit 9 FM demodulating circuit 10, 27 Reference signal Low-pass filter 11 for removal
, 28 Clamp circuit 12 Analog-to-digital conversion circuit 13, 30 Band pass filter 14, 31 Waveform shaping circuit 15 First phase adjustment circuit 16 Second phase adjustment circuit 17 Synchronization signal separation circuit 24 RGBNTSC conversion circuit 25 Low pass filter 29 NTSCRGB conversion Circuit 32 Phase adjustment circuit 40, 40A Transmitting section 41, 61 Antenna 50 Personal computer 60, 60A Receiving section 70 Display device

Claims (2)

[Claims] 1. A transmitter and a receiver, wherein the transmitter synthesizes an R signal, a G signal, a B signal, a horizontal synchronization signal, a vertical synchronization signal, and a reference signal from an image information output means to generate an image. The receiving section includes a combining means for outputting an information signal, and a transmitting means for transmitting the output image information signal to the receiving section, and the receiving section includes a receiving section for receiving the image information signal from the transmitting means, and a combining means for transmitting the output image information signal to the receiving section. In the image communication device, the combining means includes an extraction means for extracting a color signal, a horizontal synchronization signal, a vertical synchronization signal, and a clock signal from the image information signal from the receiving means and providing it to the display means, wherein the combining means extracts the R signal from the image information output means. , a G signal, and a B signal, each of which is assigned one bit, is converted into an analog signal, and is combined with a horizontal synchronization signal, a vertical synchronization signal, and a reference signal from the image information output means to create and output an image information signal. , the extraction means extracts a horizontal synchronization signal and a vertical synchronization signal from the image information signal from the reception means, respectively, and provides them to the display means, and a synchronization signal separation means extracts the image information signal from the reception means based on the input sampling signal. converting means extracting the analog signals from the above, converting them into digital signals and providing the digital signals to the display means; and converting means extracting the reference signal from the image information signal from the receiving means and adjusting the phase to create a clock signal and a sampling signal, respectively. An image communication device comprising: a display means and a clock signal generation means for providing to the conversion means. 2. The generating means includes a digital-to-analog conversion circuit that allocates one bit to each of the R, G, and B signals from the image information outputting means and converts them into analog signals, and an output signal of the digital-to-analog conversion circuit. a low-pass filter for band-limiting; a composite synchronization signal circuit for synthesizing the horizontal synchronization signal from the image information output means and the vertical synchronization signal to output a composite synchronization signal; an adder circuit that adds the output signal of the low-pass filter; and a synthesis circuit that combines the output signal of the adder circuit and the reference signal from the image information output means and outputs the resultant signal as an image information signal; The clock signal generating means includes a bandpass filter means for extracting a reference signal from the image information signal from the receiving means, and a first phase filter that adjusts the phase of the output signal of the bandpass filter means and provides a sampling signal to the converting means. 2. The image communication device according to claim 1, comprising an adjustment circuit and a second phase adjustment circuit that adjusts the phase of the output signal of said bandpass filter means and provides a clock signal to said display means.