KR20100013490A

KR20100013490A - A equipment of transmission and reception

Info

Publication number: KR20100013490A
Application number: KR1020080075028A
Authority: KR
Inventors: 김응구
Original assignee: 김응구
Priority date: 2008-07-31
Filing date: 2008-07-31
Publication date: 2010-02-10

Abstract

PURPOSE: A transmission and reception apparatus for image/voice signal using power cable is provided to transmit image/voice signal at the same time through multiple transmission circuit and a single circuit. CONSTITUTION: A switching IC(Integrated Circuit)(2) outputs the serial signal of the voice signal and video signal. The modulation PLL(Phase Locked Loop) IC(5) modulates the serial signal. The pulse trans(pulse transformer)(6) outputs the serial signal which is modulated as described above in the alternating current. A pulse trans(11) modulates the alternating current serial signal. A first amplification unit(12) amplifies the forged serial signal as described above. A demodulation PLL IC(13) demodulates the serial signal which is amplified as described above. A second amplifier outputs the serial signal which is demodulated as described above to a monitor(15) and a speaker(16).

Description

Transmission and reception apparatus of video and audio signal using power line {a equipment of transmission and reception}

The present invention relates to an apparatus for transmitting and receiving video and audio signals using a power line, and in particular, while receiving video signals and audio signals of 32 frames per second transmitted through a CCD camera and a microphone alternately through a switching IC. After converting into a serial signal, the modulated PLL IC modulates the modulated waveform into a modulated waveform and transmits it through a pulse transformer to a power line. The modulated waveform received from the power line through a pulse transcode is demodulated by a demodulated PLL IC. The present invention relates to an apparatus for transmitting and receiving video and audio signals using a power line, which is capable of simultaneously transmitting video and audio signals through a plurality of transmitting circuits and a receiving circuit by amplifying and outputting them to a monitor and a speaker.

In general, a power line communication system refers to a system that communicates by using a power line installed in a customer, for example, a local area network using power line communication is used for home automation or factory automation. .

By the way, since many loads such as a television or a computer are connected to the power line to which such a power line communication system is connected, it is difficult to transmit a communication information signal normally because various noises are emitted to the power line. In addition, signal attenuation occurs when the communication information signal is transmitted through a power line. Therefore, in order to improve this point, a repeater is usually installed in the power line.

A schematic configuration of a conventional two-way digital repeater,

A first power line modem for modulating or demodulating a communication information signal transmitted via a power line in both directions;

A central processing unit connected to one end of the first power line modem to control a relay function;

A second power line modem connected between the central processing unit and the power line and bidirectionally modulating or demodulating a communication information signal transmitted through the power line;

The first and second power line modems are connected between power lines connected to each other, and the signal separation filter is configured to block transmission of communication information signals without passing through the first and second power line modems.

The second power line modem demodulates the communication information signal modulated by the first power line modem in the second power line modem via the central processing unit, while the signal modulated in the second power line modem is transmitted through the central processing unit. It has a bidirectional signal processing operation that demodulates the power line modem.

LC signal may be used as the signal separation filter, and any filter capable of separating communication information signals between the first and second power line modems may be used.

Looking at the operation of the conventional power line repeater as described above, when the user wants to communicate data with the other party using the power line, the user transmits the communication information signal to the power line using the equipment installed in each customer in the usual manner. The transmitted communication information signal is transmitted on a power line and input to a repeater.

That is, when the communication information signal is input to the first power line modem of the repeater, the first power line modem filters the communication information signal of the band set from the power line, for example, 10 to 450 KHz, and then filters the filtered communication information signal. Demodulated by digital signal.

The restored communication information signal is inputted to the central processing unit, and accordingly the central processing unit inputs the inputted communication information signal to the second power line modem. The second power line modem modulates the demodulated communication information signal again, amplifies it into an analog sine wave signal, and transmits it through the power line. The communication signal amplified in this way includes a large current so that it can be remotely transmitted.

On the other hand, when transmitting a communication signal from the customer connected to the power line of the second power line modem side, the transmitted communication signal is processed in the same manner as the communication signal input to the first power line modem is transmitted only in the opposite direction.

Here, the signal separation filter installed between the first power line modem and the second power line modem prevents communication information signals inputted and outputted from the first power line modem and the second power line modem from being transmitted via the power line.

However, this signal separation filter passes a power signal of 60 Hz as it is.

However, the conventional power line communication repeater has a disadvantage in that the transmission line characteristics of power line communication are degraded because the propagation delay of the communication signal is generated because the power line modems convert the communication signal into a digital signal.

In addition, at least two modems, which are very expensive equipments, have to be used, thus increasing the manufacturing cost of the communication relay system.

Therefore, Patent Application No. 10-2007-0014157 dated February 12, 2007 (transmission / reception circuit of image signal using power line) was proposed.

A bias unit for adjusting a bias voltage of an image signal photographed by a CCD camera;

A voltage drop unit for converting the driving power required for signal processing;

A differential amplifier for wideband amplifying the video signal via the bias unit;

An oscillation IC for driving the video signal amplified by the differential amplifier as an input power source and modulating the video signal on a carrier frequency of an oscillation frequency while modulating the video signal;

The transmitting circuit is composed of a transformer unit which outputs an AC power line by processing a breakdown voltage while causing the modulated video signal to be induced by the transformer by the transformer.

Rectifier for supplying AC power through the oscillation frequency to the required operating power,

A transformer unit for inducing an alternating video signal by an LC tuning frequency to an alternating video signal received through the oscillation frequency;

An amplifier for amplifying the AC signal for correcting reception sensitivity;

By constructing a receiving circuit with output amplifiers for amplifying the output of the amplified video signal, it can be manufactured economically and inexpensively and is easy to install.

However, the conventional video signal transmission / reception circuit using the above-described power line modulates the video signal photographed and amplified by the camera into the video signal of the composite modulated waveform by the oscillation IC, and the modulated video signal is It transmits through the AC power line through the transformer, and demodulates the image signal by the LC tuning frequency of the transformer to the video signal of the composite modulated waveform received through the AC power line, In the process of synthesizing and synthesizing the signal, the modulated signal is changed due to factors such as external voltage change or input video signal change, and there is a disadvantage in that it must be compensated for when demodulating. There was a disadvantage of not getting it.

Accordingly, the present invention has been made to solve the above-described problems, and one serial signal is alternately inputted through a switching IC to receive an image signal and an audio signal of 32 frames per second transmitted through a CCD camera and a microphone. After converting to, modulate the modulated waveform by modulating PLL IC and transmit it through power line through pulse trans, and amplify the serial signal demodulated by demodulation PLL IC through power trans from pulse line. It is an object of the present invention to provide an apparatus for transmitting and receiving video and audio signals using a power line to transmit video signals and audio signals simultaneously through a plurality of transmitting circuits and a receiving circuit by outputting them to a monitor and a speaker, respectively. .

An apparatus for transmitting and receiving video and audio signals using a power line of the present invention for achieving the above object,

32 frames per second video signal transmitted from the CCD camera is input to the first input terminal of the switching IC via a capacitor,

The voice signal transmitted through the microphone is input to the second input terminal of the switching IC via a preamplifier,

The switching IC outputs a serial signal obtained by mixing an input video signal and an audio signal according to an alternating cycle of the switching IC.

The modulation PLL IC for driving the serial signal of the video signal and the audio signal transmitted through the switching IC as an input power source outputs a modulated serial signal obtained by modulating the serial signal.

The pulse transformer in which the modulated serial signal modulated by the modulating PLL IC is induced on the primary side outputs an AC series signal induced on the secondary side to the AC power line, and constitutes a plurality of transmission circuits.

The modulated serial signal is induced on the secondary side of the pearl transformer in which the serial signal modulation of AC transmitted from the AC power line is induced on the primary side,

Compensating for the attenuation part while being transmitted while amplifying the modulated serial signal by a first amplifying unit receiving the modulated serial signal,

In the demodulation PLL IC which drives the amplified modulation serial signal as an input power supply, the demodulation PLL IC carries out demodulation while putting the modulation serial signal on a frequency.

The video signal and the audio signal demodulated by the demodulation PLL IC are amplified by the second amplifying unit and configured to output to a monitor and a speaker. It can transmit signal and voice signal at the same time, and it is possible to transmit and receive long distance stably without changing by external factor by PLL IC.

The apparatus for transmitting and receiving video and audio signals using power lines according to the present invention alternately receives 32 frames of video and audio signals per second transmitted through a CCD camera and a microphone through a switching IC.

The switching IC converts the signal into one serial signal, modulates the modulation waveform by the modulating PLL IC, and transmits the signal through a pulse transformer.

Demodulated by the demodulation PLL IC received from the power line via a pulse trans

By amplifying the demodulated serial signal and outputting it to the monitor and the speaker, respectively, video and audio signals can be simultaneously transmitted through multiple transmitting circuits and one receiving circuit, and are not changed by external factors by the PLL IC. It also has the effect of enabling stable transmission and reception over long distances.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 illustrates a schematic configuration of an apparatus for transmitting and receiving video and audio signals using a power line according to the present invention.

If the video signal and audio signal of 32 frames per second taken by the CCD camera are transmitted from the transmitting circuit as a single serial signal through the power line, the receiving circuit receiving the serial signal is output as the video signal and audio signal,

The 32 frames per second video signal transmitted from the CCD camera 1 is input to the first input terminal of the switching IC 2 via the capacitor C1,

The audio signal transmitted through the microphone 3 is input to the second input terminal of the switching IC 2 via the preamplifier 4,

The switching IC 2 outputs a serial signal obtained by mixing an input video signal and an audio signal according to a period in which the switching IC 2 is alternately connected.

The modulation PLL IC 5 for driving the serial signal of the video signal and the audio signal transmitted through the switching IC 2 as an input power source outputs a modulated serial signal obtained by modulating the serial signal.

The pulse transformer 6, in which the modulated serial signal modulated by the modulated PLL IC 5 is induced on the primary side, outputs a series of alternating-current signals induced on the secondary side to the AC power line 10. Configure the circuit,

The modulated serial signal is induced on the secondary side of the pulse transformer 11 in which the serial signal modulation of AC transmitted from the AC power line 10 is induced on the primary side,

Compensation for the attenuation part is performed while being amplified by the first amplifier 12 receiving the modulated serial signal.

The demodulation PLL IC 13 which drives the modulation serial signal amplified by the said 1st amplifier 12 as an input power source is made to demodulate, carrying said modulation serial signal at a frequency,

The second amplification section 14 amplifies the serial signal of the video signal and the audio signal of 32 frames per second demodulated by the demodulation PLL IC 13 to output to the monitor 15 and the speaker 16. It is a receiving circuit.

2 shows a detailed configuration of a transmission circuit according to the present invention,

The 32 frames per second video signal transmitted from the CCD camera 1 is input to the first input terminal IN1 of the switching IC 2 via the capacitor C1,

The audio signal transmitted through the microphone 3 is input to the second input terminal IN2 of the switching IC 2 via the preamplifier 4,

The switching IC 2 is a period in which an input video signal and an audio signal are alternately connected to the first input terminal IN1 and the second input terminal IN2 of the contact switch 2a of the switching IC 2. To output a serial signal mixed with a video signal and an audio signal,

Modulation of Modulation PLL IC (5) Driving a Serial Signal of Video and Audio Signals Passed Through the Switching IC (2) as an Input Power Source The 50 MHz band PLL IC (7) modulates the serial signal. Output the serial signal through the amplifier (8),

The multiple modulation 500 KHz band PLL ICs 9, 9a, 9b and 9c connected in parallel to the hysteresis input stage of the modulation 50 MHz band PLL IC 7 are each connected to a variable resistor VR1 connected to each hysteresis input stage. One of the series connection of (VR2) (VR3) (VR4) and condenser (C2) (C3) (C4) (C5) is determined by the time constant selected by the switch (SW1) (SW2) (SW3) (SW4). A frequency synchronized with the oscillation frequency is sequentially transmitted to the modulation 50 MHz band PLL IC 7 so that modulation by the frequency is performed sequentially.

The pulse transformer 6 in which the modulated serial signal modulated by the modulating PLL IC 5 is induced on the primary side outputs an AC series signal induced on the secondary side to the AC power line 10. will be.

3 shows a detailed configuration of a receiving circuit according to the present invention,

The AC signal transmitted from the AC power line 10 through the transformer 11 is amplified by the third amplifier 12 of the amplifier OP2,

The demodulation 50 MHz band PLL IC 17 of the demodulation PLL IC 13 which drives the amplified AC serial signal as an input power source is provided with a video signal of 32 frames per second demodulated by carrying the serial signal at a frequency. Output serial signal of audio signal,

The demodulation 500 KHz band PLL IC 18 connected to the hysteresis input terminal of the demodulation 50 MHz band PLL IC 17 has a relay contact SW5 (SW6) (SW7) (SW8) and a variable resistor connected in parallel to its own hysteresis input terminal. (VR5) (VR6) (VR7) (VR8) and condenser (C6) during series connection, the frequency in synchronization with the oscillation frequency determined by the time constant selected by the relay contacts (SW5) to (SW8) is demodulated 50 MHz band PLL Is delivered to the IC 17 so that demodulation by the frequency is achieved,

The remote control receiver 20 which receives the selection signal through the user's remote controller 21 drives the corresponding reed relays RY1, RY2, RY3, and RY4 through the relay driver 19, and the relay contact SW5. ) To (SW8) to turn it on,

The serial signal of the video signal and the audio signal demodulated by the demodulation PLL IC 13 is amplified by the second amplifying unit 14 including the transistor TR1, the resistors R1, R2, and the capacitor C7. and,

The serial signal of the amplified video signal and the audio signal is transmitted to the monitor 15 and the speaker 16 and constitutes a reception circuit for outputting the video image and the audio.

The apparatus for transmitting and receiving video and audio signals using the power line of the present invention configured as described above,

An image signal of 32 frames per second transmitted from the CCD camera 1 is input to the first input terminal IN1 of the switching IC 2 via the capacitor C1.

In the video signal of 32 frames per second, one frame constituting one screen has an output waveform of 15.4 KHz.

The voice signal transmitted through the microphone 3 is also input to the second input terminal IN2 of the switching IC 2 via the preamplifier 4.

Therefore, the switching IC 2 is configured to alternately connect an input video signal and an audio signal to the first input terminal IN1 and the second input terminal IN2 of the contact switch 2a of the switching IC 2. According to the period, the video signal and the audio signal having the output waveform of 15.4KHz are mixed, and the serial signal is mixed with the video signal and the audio signal having the output waveform of 7.7KHz by the output waveform of 15.4KHz.

Modulation of Modulation PLL IC (5) Driving a Serial Signal of Video and Audio Signals Transmitted through the Switching IC (2) as an Input Power Source In the 50 MHz band PLL IC (7), modulation of the serial signal is performed. The serial signal is output through the amplifier 9.

A plurality of modulation 500 KHz band PLL ICs 8, 8a, 8b and 8c connected in parallel to the hysteresis input terminal of the modulation 50 MHz band PLL IC 7 are each connected to a variable resistor VR1 connected to each hysteresis input terminal. One of the serial connection of (VR2) (VR3) (VR4) and condenser (C2) (C3) (C4) (C5) is determined by the time constant selected by the switch (SW1) (SW2) (SW3) (SW4). The frequency of the waveform synchronized with the lost oscillation frequency is sequentially transmitted to the modulation 50 MHz band PLL IC 7 so that modulation by the frequency is performed sequentially.

The pulse transformer 6 in which the modulated serial signal modulated by the modulation PLL IC 5 is induced on the primary side causes the AC power line 10 to output the serial signal of alternating current induced on the secondary side.

The AC signal transmitted from the AC power line 10 through the transformer 11 is amplified by the third amplifier 12 of the amplifier OP2.

The demodulation 50 MHz band PLL IC 17 of the demodulation PLL IC 13 which drives the amplified AC serial signal as an input power supply is a serial signal of a video signal and an audio signal demodulated while carrying the serial signal at a frequency. To output

Relay contacts SW5, SW6, SW7, SW8 and variable resistors connected in parallel to the self hysteresis input terminal of the demodulation 500 KHz band PLL IC 18 connected to the hysteresis input terminal of the demodulation 50 MHz band PLL IC 17. (VR5) (VR6) (VR7) (VR8) and condenser (C6) during series connection, the frequency in synchronization with the oscillation frequency determined by the time constant selected by the relay contacts (SW5) to (SW8) is demodulated 50 MHz band PLL The signal is transmitted to the IC 17 to demodulate by the corresponding frequency so as to output a serial signal of a video signal and an audio signal.

The serial signal of the video signal and the audio signal demodulated by the demodulation PLL IC 13 is amplified by the second amplifying unit 14 including the transistor TR1, the resistors R1, R2, and the capacitor C7. do.

The serial signal of the amplified video signal and the audio signal is transmitted to the monitor 15 and the speaker 16 to output the video screen and the audio.

If the video signal is a 20MHz band, the audio signal has a large difference in signal level as much as 1MHz band, so it is not necessary to use a separate circuit.

In the above description of the preferred embodiment of the present invention and is not limited to the above-described embodiment, any person having ordinary knowledge in the field of the present invention without departing from the gist of the invention claimed in the claims. Various modifications are possible and, of course, such changes are within the scope of the claims as described.

1 is a block diagram showing the overall configuration of the present invention.

2 is a circuit diagram showing the configuration of the transmission circuit of the present invention.

Figure 3 is a circuit diagram showing the configuration of the receiving circuit of the present invention.

Explanation of symbols on the main parts of the drawings

1: CCD camera 2: switching IC

3: microphone 4: preamplifier

5: modulation PLL IC 10: AC power line

13: demodulation PLL IC A: transmission circuit

B: receiving circuit

Claims

When the video and audio signals captured by the CCD camera are transmitted from the transmitting circuit as a single serial signal through the power line, the receiving circuit receiving the serial signal is output as the video and audio signals.

The video signal transmitted from the CCD camera 1 is input to the first input terminal through the condenser C1 and is alternately connected to the audio signal transmitted through the microphone 3 through the preamplifier 4 to the second input terminal. A switching IC 2 for outputting a mixed serial signal in accordance with a cycle of

A modulation PLL IC 5 for outputting a modulated serial signal obtained by modulating the serial signal while driving the serial signal of a video signal and an audio signal transmitted through the switching IC 2 as an input power source;

When the modulated serial signal modulated by the modulating PLL IC 5 is induced on the primary side, a transmission circuit is composed of pulse transformers 6 outputting to the AC power line 10 while inducing the AC serial signal on the secondary side. Meanwhile,

A pulse transformer 11 for causing a modulated serial signal to be induced on the secondary side when the serial signal modulation of AC transmitted from the AC power line 10 is induced on the primary side;

A first amplifier 12 for amplifying when the modulated serial signal is received and compensating for attenuation during transmission;

A demodulation PLL IC 13 for demodulating the modulation serial signal by driving the modulated serial signal amplified by the first amplifier 12 as an input power source at a bottom dead frequency;

The receiving circuit comprises a second amplifying unit 14 which amplifies the serial signal of the video signal and the audio signal demodulated by the demodulation PLL IC 13 and outputs it to the monitor 15 and the speaker 16. Apparatus for transmitting and receiving video and audio signals using power lines.

The method of claim 1,

The above transmission circuit,

The video signal transmitted from the CCD camera 1 is input to the first input terminal IN1 of the switching IC 2 via the capacitor C1,

The multiple modulation 500 KHz band PLL ICs 9, 9a, 9b and 9c connected in parallel to the hysteresis input stage of the modulation 50 MHz band PLL IC 7 are each connected to a variable resistor VR1 connected to each hysteresis input stage. One of the series connections of (VR2) (VR3) (VR4) and condenser (C2) (C3) (C4) (C5) is determined by the time constant selected by the switch (SW1) (SW2) (SW3) (SW4). A frequency synchronized with the oscillation frequency is sequentially transmitted to the modulation 50 MHz band PLL IC 7 so that modulation by the frequency is performed sequentially.

The pulse transformer 6 in which the modulated serial signal modulated by the modulation PLL IC 5 is induced on the primary side is configured to output an AC serial signal induced on the secondary side to the AC power line 10. Device for transmitting and receiving video and audio signal using power line.

The method of claim 1,

The receiving circuit is

The demodulated 500 KHz band PLL IC 18 connected to the hysteresis input terminal of the demodulation 50 MHz band PLL IC 17 has a relay contact SW5 (SW6) (SW7) (SW8) and a variable resistor connected in parallel to its own hysteresis input terminal. (VR5) (VR6) (VR7) (VR8) and condenser (C6) during series connection, the frequency in synchronization with the oscillation frequency determined by the time constant selected by the relay contacts (SW5) to (SW8) is demodulated 50 MHz band PLL Is delivered to the IC 17 so that demodulation by the frequency is achieved,

The serial signal of the video signal and the audio signal demodulated by the demodulation PLL IC 13 is amplified by the second amplifying unit 14 including the transistor TR1, the resistors R1, R2, and the capacitor C4. and,

The amplified video signal and the serial signal of the audio signal is transmitted to the monitor 15 and the speaker 16 to transmit the video and audio signals using a power line, characterized in that for configuring the receiving circuit for outputting video and audio, Receiver.