JP6273336B1 - A supervisory control system that transmits four mixed signals via one coaxial cable - Google Patents

Abstract

Four mixed signals are transmitted through one coaxial cable. A monitoring control system includes a first transmission / reception unit (10) and a second transmission / reception unit (30). The second transmission / reception unit has a plurality of input devices (41) and output devices (40) connected thereto, and is connected to the first transmission / reception unit via a coaxial cable (20). The first transmission / reception unit has a plurality of input devices (11) and output devices (12) connected thereto. Carrier signals include high resolution video signals, audio signals, control signals, and power signals, which occupy different frequency bands of the carrier signals, which are frequency multiplexed, via a coaxial cable in full duplex mode Can be transmitted simultaneously, and the structural convenience and construction cost of the monitoring control system can be reduced. [Selection] Figure 2

Description

  The present invention relates to a supervisory control system, and more particularly, to a supervisory control system that transmits four mixed signals via one coaxial cable.

  The current market for supervisory control systems is heading towards high-resolution analog supervisory control systems, the mainstream of which is focused. The so-called “high resolution” means a video format having a minimum resolution of 720 pixels or more. Three types of high resolution technologies are prevalent among high resolution analog surveillance control systems: high resolution composite video interface (HDCVI), high resolution transmission video interface (HDTVI), and analog high resolution standard (AHD).

  From the user's perspective, upgrading a traditional analog supervisory control system to CVI, TVI, AHD, etc. is not a difficult task in terms of installation and construction. This is because no changes need to be made to the conventional analog supervisory control system. Moreover, CVI, TVI, AHD, etc. can be applied to an environment where coaxial cables are used for communication. In view of such upgradeability, CVI, TVI, AHD, etc. have gained wide market acceptance. However, these high resolution technologies are still inadequate in compatibility and functionality. This is because CVI is not backward compatible for different analog interfaces with the same image resolution, and TVI lacks support for both ISP (Image Signal Processor) and TX (Transmission) chips simultaneously. Because. On the other hand, the signal transmission means and system control means used in the conventional supervisory control technology differ from case to case. For example, in the case of communication via a single coaxial cable, the video signal and the power signal are transmitted via a single coaxial cable, and in the case of communication via a different transmission medium, the video signal, the control signal and the power signal are different from each other. It is transmitted with.

  Regardless of what kind of video format is used in the conventional surveillance control technology, its signal transmission and system control are not satisfactory as far as customization is concerned. This is because if there is a need for integration with an already installed high resolution analog supervisory control system, structural inconvenience and cost increase occur, and further integration of signal transmission means and system control means is required. In some cases, the construction involves high levels of difficulty and high fiscal expenditure.

  An object of the present invention is to provide a supervisory control system that transmits four mixed signals through one coaxial cable, and mixes a high resolution video signal, an audio signal, a control signal, and a power signal into a carrier signal. Thus, simultaneous transmission using a single cable facilitates construction and reduces system costs.

  In order to achieve the above object, a supervisory control system that transmits four mixed signals through one coaxial cable includes a first transmission / reception unit, a coaxial cable, and a second transmission / reception unit.

  The first transmission / reception unit is connected to a plurality of first input devices and a plurality of first output devices.

  A coaxial cable for transmitting a carrier signal transmits a carrier signal in full-duplex mode via the coaxial cable, and the carrier signal is a plurality of digital signals that occupy different frequency bands on the carrier signal. And a power signal. The carrier signal has a first carrier signal and a second carrier signal transmitted by the first transceiver unit. The coaxial cable has a first terminal and a second terminal. The first terminal is connected to the first transmission / reception unit.

  The second transmitting / receiving unit is connected to the second terminal of the coaxial cable, the plurality of second input devices, and the plurality of second output devices, and selectively mixes the digital signal and the power signal into the second carrier signal. .

  When receiving the first carrier signal including the high resolution video signal, the audio signal, and the control signal, the second transmission / reception unit executes a signal download mode to frequency demultiplexing (frequency separation), and the first carrier signal Is decoded to obtain a high resolution video signal, audio signal and control signal in the first carrier signal, and further provides the high resolution video signal, audio signal and control signal to the corresponding second output device. .

  When receiving a second carrier signal including an audio signal, a control signal, and a power signal, the first transmitting / receiving unit first extracts the power signal, and then frequency demultiplexes the second carrier signal and decodes (decodes) the second carrier signal. To obtain the audio signal and control signal in the second carrier signal, and provide the audio signal, control signal and power signal in the second carrier signal to the corresponding first output device.

  In the above monitoring control system, the first transmission / reception unit includes a plurality of first input devices and a plurality of first output devices connected thereto. When receiving the high resolution video signal, audio signal and control signal from the first input device, the first transmitting / receiving unit frequency multiplexes the high resolution video signal, audio signal and control signal into the first carrier signal, and One carrier signal is transmitted to the second transmitting / receiving unit via a coaxial cable. When receiving a second carrier signal including an audio signal, a control signal, and a power signal from the first terminal of the coaxial cable, the first transmission / reception unit first extracts the power signal and then extracts the audio signal from the second carrier signal. And the control signal are frequency-demultiplexed, the audio signal and the control signal are provided to the corresponding first output device, and the power (power) is supplied to the first transmission / reception unit, the first input device, and the first output device. To do. When receiving the second carrier signal from the second terminal of the coaxial cable, the second transmission / reception unit frequency demultiplexes the high resolution video signal, the audio signal and the control signal from the second carrier signal, The audio signal and the control signal are provided to the corresponding second output device. When receiving the audio signal, the control signal, and the power signal from the second input device, the second transmitting / receiving unit frequency-multiplexes the audio signal and the control signal, and inputs the second power signal to generate the second carrier signal. The second carrier wave is transmitted to the first transmitting / receiving unit via the coaxial cable. Therefore, simultaneous transmission of the first carrier signal and the second carrier signal can be achieved via the same coaxial cable, which increases the structural convenience and reduces the construction cost of the monitoring control system.

  According to the supervisory control system of the present invention, by providing a supervisory control system that transmits four mixed signals through one coaxial cable, a high resolution video signal, an audio signal, a control signal, and a power signal are transmitted as a carrier signal. Can be mixed and transmitted simultaneously with a single cable, facilitating construction and reducing system costs.

  Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

It is a functional block diagram which shows the system architecture of the supervisory control system which transmits four mixed signals via one coaxial cable by this invention. It is another functional block diagram which shows the system architecture of the monitoring control system in FIG. 4 is a graph showing signal strength and frequency for four mixed signals transmitted over one coaxial cable according to the present invention. FIG. 2 is an operational function block diagram showing signal mixing and upload modes executed by the supervisory control system in FIG. 1. FIG. 2 is an operational function block diagram showing a signal interpolation mode executed by the monitoring control system in FIG. 1. It is an operation | movement functional block diagram which shows the other signal combination upload mode performed by the monitoring control system in FIG.

  A preferred embodiment of a supervisory control system for transmitting four mixed signals through one coaxial cable according to the present invention will be described in detail with reference to the drawings.

  Referring to FIG. 1, a supervisory control system for transmitting four mixed signals through one coaxial cable according to the present invention includes a first transmission / reception unit 10, a coaxial cable 20, and a second transmission / reception unit 30. . The first transmission / reception unit 10 is connected to a plurality of first input devices 11 and a plurality of first output devices 12. The second transmission / reception unit 30 is connected to a plurality of second output devices 40 and a plurality of second input devices 41. The coaxial cable 20 transmits a carrier signal in a full-duplex mode via the coaxial cable 20, and the carrier signal is a plurality of digital signals and / or power signals that occupy different frequency bands on the carrier signal. Contains. The coaxial cable has a first terminal and a second terminal. A first terminal of the coaxial cable 20 is connected to the first transmission / reception unit 10, and a second terminal of the coaxial cable 20 is connected to the second transmission / reception unit 30.

  A compressed high-resolution video signal, a compressed high-resolution video signal frequency-multiplexed by a first transceiver unit 10 from a second terminal of the coaxial cable 20, a compressed audio signal and a control signal When receiving the carrier signal, the second transmitting / receiving unit 30 executes a signal download mode, frequency demultiplexes the first carrier signal, and compresses the high resolution video signal compressed from the first carrier signal, compressed audio. After acquiring the signal and the control signal and further decompressing the compressed high resolution video signal and the compressed audio signal, the high resolution video signal, the audio signal, and the control signal are provided to the corresponding second output device 40. .

  When receiving the audio signal, control signal, and power signal from the corresponding second input device 41, the second transmitting / receiving unit 30 executes the signal upload mode, compresses the audio signal, and frequency-multiplexes the audio signal and the control signal. The power signal is input into the second carrier signal, and the second carrier signal is transmitted to the first transmission / reception unit 10 via the coaxial cable 20. Further, after receiving the second carrier signal, the first transmitting / receiving unit 10 first extracts the power signal from the second carrier signal, then frequency demultiplexes the second carrier signal, and compresses the audio signal. After acquiring the signal and the control signal, and then decompressing the compressed audio signal, the audio signal and the control signal are provided, and power is supplied to the corresponding first output device 12.

  By simultaneously transmitting a high-resolution video signal, audio signal, control signal and power signal via a single coaxial cable by frequency division multiplexing and power signal interpolation, the high structural convenience of the overall monitoring and control system and Cost reduction can be achieved.

  Referring to FIG. 2, the first transmission / reception unit 10 can be connected to a plurality of first input devices 11 and a plurality of first output devices 12 at the same time, and the second transmission / reception unit 30 is connected to a plurality of second input devices 11. The input device 41 and the plurality of second output devices 40 can be connected. The first input device 11 can include a camera, a microphone, and the like. The second input device 41 can include a microphone, a serial communication interface, and the like. The first output device 12 or the second output device 40 may optionally include a siren, a speaker, a serial communication interface, a display and a video recorder. In this embodiment, the coaxial cable 20 has a plurality of digital signal channels for a first carrier signal and a second carrier signal including a compressed high resolution video signal, a compressed audio signal, a control signal and a power signal. And simultaneously transmitted in the upload direction and the download direction via the coaxial cable 20.

  The second transmission / reception unit 30 includes a first connection port 31, a second connection port 32, an AV (audio / video) processing module 33, a microcontroller unit (MCU) 34, and a power module 35. The first connection port 31 is connected to the second terminal of the coaxial cable 20. The second connection port 32 is connected to the second output device 40 and the second input device 41. The AV processing module 33 is connected to the first connection port 31 and the second connection port 32.

  The power module 35 is connected to the first connection port 31 and the second connection port 32 to receive the power signal, interpolates the power signal into the second carrier signal according to the signal upload mode, and operates power (power). Is supplied to the first transmission / reception unit 10, the first input device 11, and the first output device 12 via the first connection port 31 and the coaxial cable 20. The microcontroller unit (MCU) 34 is connected to the first connection port 31, the AV processing module 33 and the second connection port 32, receives control signals from the first connection port 31 and the second connection port 32, The control signal is transmitted to a corresponding module included in the second transmission / reception unit 30.

  In this embodiment, the AV processing module 33 further includes an equalizer 331, a video decoder 332, an image processor 333, and an audio decoder 334. The video decoder 332 is connected to the equalizer 331, the image processor 333, and the audio decoder 334. The equalizer 331 is connected to the first connection port 31 and the microcontroller unit (MCU) 34. The image processor 333 and the audio decoder 334 are connected to the second connection port 32. The equalizer 331 receives the high resolution video signal and the audio signal from the first connection port 31, and these are transmitted to the video decoder 332. The video decoder 332 decodes the compressed high-resolution video signal, obtains a digital video signal for the image processor 333, processes the digital video signal, and converts the high-resolution video signal to the second connection port 32. Transmit to. The audio decoder 334 receives the audio signal from the video decoder 332, expands the audio signal, and transmits the audio signal to the second connection port 32. Thus, the high resolution video / audio signal can be further transmitted to the corresponding second output device 40 via the second connection port 32.

  Transmission interfaces for high-resolution video signals can include a high-resolution composite video interface (HDCVI), a high-resolution transmission video interface (HDTVI), and an analog high-resolution standard (AHD). The signal interface of the coaxial cable 20 can include EX-SDI (Extended Serial Digital Interface).

  In this embodiment, the control signal includes a CoC (cable control) signal. After being frequency multiplexed, the CoC signal is uploaded to the corresponding first input device 11 via the coaxial cable 20. The power (power) signal includes a PoC (cable power) signal, and the power (power) is supplied to the first transmission / reception unit 10, the first input device 11, and the first output device 12 via the coaxial cable 20. To do.

  Referring to FIG. 3, an example showing the frequency and signal strength of a signal frequency-multiplexed with the first carrier signal and the second carrier signal during the signal download mode and the signal upload mode will be described below. In this example, the horizontal and vertical axes clearly indicate the frequency and signal strength of the first carrier signal or the second carrier signal, respectively. The first carrier signal is displayed at S4 and includes a combination of a compressed high resolution video signal, a compressed audio signal and a control signal in signal download mode. The second carrier signal is displayed by a combination of the compressed audio signal S3, the control signal S2, and the power signal S1 in the signal upload mode. The signal strength of all other signals S1, S2 and S3 of the first carrier signal S4 and the second carrier signal is A, and the power signal S1, the control signal S2, the audio signal S3 and the first carrier signal S4 The frequencies are indicated by F1, F2, F3 and F4 respectively and are 0 Hz, 600 KHz, 2.8 MHz and 270 MHz, respectively.

  Referring to FIG. 4, the first transmission / reception unit 10 includes a transmission terminal, a filter 101, and a first output unit 102. The transmission terminal of the first transmission / reception unit 10 is connected to the first terminal of the coaxial cable 20. The input terminal of the filter 101 is connected to the transmission terminal of the first transmission / reception unit 10. The output terminal of the filter 101 is connected to the first output unit 102. The second transmission / reception unit 30 includes a reception terminal, a modulation unit 301 and a first input unit 302. The receiving terminal of the second transmission / reception unit 30 is connected to the second terminal of the coaxial cable 20. The input terminal of the modulation unit 301 is connected to the first input unit 302. The output terminal of the modulation unit 301 is connected to the reception terminal of the second transmission / reception unit 30. In the signal upload mode described above, the first input unit 302 transmits a control signal or digital audio signal to the modulation unit 301, and the modulation unit 301 applies the control signal or digital audio signal to the second carrier signal, which Uploaded to one transmission / reception unit 10. In this embodiment, the first input unit 302 is a generator or an audio amplifier conforming to the Pelco D / P protocol, and the first output unit 102 is a driver or an audio demodulator conforming to the Pelco D / P protocol. .

  Referring to FIG. 5, in order to execute the signal download mode, the first transmission / reception unit 10 has a second input unit 103 and a transmission terminal, and the second transmission / reception unit 30 is a second output unit. 303 and a receiving terminal. The second input unit 103 is connected to the transmission terminal of the first transmission / reception unit 10. The second output unit 303 is connected to the receiving terminal of the second transmitting / receiving unit 30. The second input unit 103 modulates the high-resolution video signal, the audio signal, and the control signal, and applies the high-resolution video signal, the audio signal, and the control signal to the first carrier signal, The carrier wave signal is transmitted to the transmission terminal, and further transmitted to the second output unit 303 of the second transmission / reception unit 30 via the coaxial cable 20. In this embodiment, the second input unit 103 is a digital signal generator or an analog / digital converter (ADC) encoder, and the second output unit 303 is a driver or digital / analog converter (DAC) compliant with the Pelco D / P protocol. ) Decoder.

  The power (power) signal transmitted by the first input device 11 and the second input device 41 takes the form of DC (direct current) power. When the power signal is interpolated to the second carrier signal in the signal upload mode, referring to FIG. 6, the signal upload mode is the same as FIG. However, the difference is that the modulation unit 301, the filter 101, the first input unit 302, and the first output unit 102 in FIG. 4 are the same as the first low-pass filter 304, the second low-pass filter 104, and the voltage regulator in FIG. 305 and the converter 105 are respectively replaced.

  In view of the above description, the supervisory control system according to the present invention transmits a video signal, a control signal, an audio signal, and a power signal by transmitting a carrier signal having all signals located on different frequency bands through one coaxial cable. Transmit in full-duplex / simultaneous transmission mode. The filters usable in the first transmission / reception unit 10, the first input device 11, the first output device 12, the second transmission / reception unit 30, the second input unit 41, and the second output unit 40 have different frequencies. In this case, it is ensured that no interference occurs at the time of signal acquisition.

  Although many features and advantages of the present invention have been described in the foregoing description, together with details of the structure and function of the present invention, the disclosure is illustrative only, and modifications are notable in particular in the shape, dimensions, and arrangement of components. This can be done in detail in the matter, which is possible within the full scope of the principles of the invention indicated by the broad general meaning of the terms and is expressed in the appended claims.

DESCRIPTION OF SYMBOLS 10 ... 1st transmission / reception unit 11 ... 1st input device 12 ... 1st output device 20 ... Coaxial cable 30 ... 2nd transmission / reception unit 31 ... 1st connection Port 32 ... Second connection port 33 ... AV processing module 34 ... Microcontroller unit 35 ... Power module 40 ... Second output device 41 ... Second input device 101 · ··· Filter 102 ··· First output unit 103 ··· Second input unit 104 · · · Second low-pass filter 105 · · · Converter 301 · · · Modulation unit 302 · · · First input unit 303 ... second output unit 304 ... first low-pass filter 305 ... voltage regulator 331 ... equalizer 332 ... video decoder 333 ... image Processor 334 ... audio decoder S4 ... first carrier signal a second carrier signal (S3 ... audio signal, S2 ... control signal, S1 ... power signal)
A: Signal strength F1, F2, F3, F4 ... Frequency

Claims (10)

A supervisory control system for transmitting four mixed signals through one coaxial cable,
A first transmission / reception unit connected to the plurality of first input devices and the plurality of first output devices;
A plurality of digital signals that occupy different frequency bands on the carrier signal in full-duplex mode and a coaxial cable that transmits the carrier signal including a power signal, and the carrier signal is the first transmission / reception signal. Comprising a first carrier signal and a second carrier signal transmitted by the unit, the coaxial cable comprising:
A first terminal connected to the first transceiver unit;
A second terminal,
The digital signal is selectively frequency-multiplexed and connected to the second terminal of the coaxial cable, a plurality of second input devices and a plurality of second output devices, and the power signal is converted to the second carrier signal. A second transmission / reception unit for
When receiving the first carrier signal including a high-resolution video signal, an audio signal, and a control signal that are frequency-multiplexed by the first transmission / reception unit, the second transmission / reception unit performs signal download to perform the first download. The high-resolution video signal, the audio signal, and the control signal in the carrier wave signal are frequency-demultiplexed and decoded, and the high-resolution video signal, the audio signal, and the control signal are provided to the corresponding second output device. ,
When receiving the second carrier signal including an audio signal, a control signal and a power signal, the first transmitting / receiving unit first extracts the power signal, and then frequency demultiplexes the second carrier signal, Decode and acquire the audio signal and the control signal in the second carrier signal, and provide the audio signal, the control signal and the power signal in the second carrier signal to a corresponding first output device A supervisory control system characterized by that. When receiving an audio signal, a control signal and a power signal from a corresponding second input device, the second transmitting / receiving unit executes a signal upload mode, frequency-multiplexes the audio signal and the control signal, and outputs the power signal. Is inserted into the second carrier signal, and the second carrier signal is transmitted to the first transmission / reception unit via the coaxial cable,
After receiving the second carrier signal, the first transceiver unit first extracts the power signal from the second carrier, then frequency demultiplexes the second carrier signal, and the audio signal 2. The monitoring control system according to claim 1, further comprising: obtaining the control signal, providing the audio signal and the control signal to a corresponding first output device, and supplying power. 3. The second transmission / reception unit includes:
A first connection port connected to the second terminal of the coaxial cable;
A second connection port connected to the second output device and the second input device;
An AV (audio / video) processing module connected to the first connection port and the second connection port;
A microcontroller unit (MCU) connected to the first connection port, the AV processing module, and the second connection port and executing the signal download mode and the signal upload mode;
The monitoring control system according to claim 2, further comprising: a power module connected to the first connection port and the second connection port. The AV processing module includes:
An equalizer connected to the first connection port and the MCU;
An image processor and an audio decoder connected to the second connection port;
4. The supervisory control system according to claim 3, further comprising a video decoder connected to the equalizer, the image processor, and the audio decoder. The first transmission / reception unit includes:
A transmission terminal connected to the first terminal of the coaxial cable;
A first output unit;
A filter, the filter comprising:
An input terminal connected to the transmission terminal of the first transceiver unit;
An output terminal of the filter connected to the first output unit;
The second transmission / reception unit includes:
A receiving terminal connected to the second terminal of the coaxial cable;
A first input unit;
Execute the signal upload mode, modulate the second carrier signal with the audio signal, the control signal, and the power signal, and send the second carrier signal to the first transmission / reception unit via the coaxial cable. A modulation unit for transmitting, the modulation unit comprising:
An input terminal connected to the first input unit;
The monitoring control system according to claim 1, further comprising an output terminal of the modulation unit connected to the reception terminal of the second transmission / reception unit.   The first input unit is one of a generator and an audio amplifier conforming to the Pelco D / P protocol, and the first output unit is one of a driver and an audio demodulator conforming to the Pelco D / P protocol. 6. The supervisory control system according to claim 5.   The modulation unit is a first low-pass filter, the filter is a second low-pass filter, the first input unit is a voltage regulator, and the first output unit is a converter. The monitoring control system according to claim 6. The first transmission / reception unit includes:
A second input unit that is one of a digital signal generator and an analog-to-digital converter (ADC) encoder;
A transmission terminal,
Said second transceiver unit,
Connected to the transmission terminal of the first transmission / reception unit, modulates the high resolution video signal, the audio signal and the control signal, and transmits the high resolution video signal, the audio signal and the control signal to the first carrier wave. A second output unit that is one of a driver and a digital-to-analog converter (DAC) decoder compliant with the Pelco D / P protocol;
The monitoring control system according to claim 1, further comprising a receiving terminal connected to the second output unit .   The transmission interface for the high-resolution video signal includes a high-resolution composite video interface (HDCVI), a high-resolution transmission video interface (HDTVI), and an analog high-resolution standard (AHD). The signal interface of the coaxial cable is EX- An SDI (Extended Serial Digital Interface) is included, the control signal includes a CoC (Cable Control) signal, and the power signal includes PoC (Cable Power). The monitoring and control system described.   The transmission interface for the high resolution video signal includes HDCVI, HDTVI and AHD, the signal interface of the coaxial cable includes EX-SDI, the control signal includes a CoC signal, and the power signal 10. The supervisory control system according to claim 1, wherein PoC signal is included.

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