KR20020066170A - Multi communication system - Google Patents

Abstract

PURPOSE: A multi communication system is provided to save a power and reduce the length of coaxial cable by transmitting all of an image signal, an audio signal, a data signal and a control signal between a main control part and a passive control part and a power through one coaxial cable. CONSTITUTION: A multi communication system includes a main control part(100) for sending/receiving a power and a various signals through a coaxial cable and a passive control part(200) for being applied the power from the main control part(100) and for transferring the image signal, the audio signal and the data signal, sensed by the operation of the main control part(100), in response to the control of the main control part(100).

Description

Multi communication system

The present invention relates to a multi-communication system, and more particularly, to a multi-communication system used in various robots, closed circuit television (CCTV) cameras, toys, and the like.

In general, during the non-destructive testing of complex and diversified structures, the length of the long, thin pipes or the sections of the pipes are large and the size of the robot could not be inspected internally.

Conventionally, the thickness of the cable was thick by controlling with several lines for driving in robots, driverless parking lots, CCTV robots and the like.

That is, the object was adjusted and the image was received through a separate power line, a separate image line, a separate lighting line, and a separate drive adjustment line.

Because of this, the weight of the cable became heavy, and the driving ability of the robot to pull the cable had to increase.

In particular, in the hearing blind area where wireless communication is not possible, only wires must be used.

The technical problem of the present invention is to provide a multi-communication system for transmitting a video signal, an audio signal, a control signal, and a power supply between a main adjusting part and a part to be adjusted through a single coaxial cable.

1 is a block diagram of a multiple communication system according to an embodiment of the present invention.

2 through 7 are respective signal waveform diagrams of a multiple communication system according to an embodiment of the present invention.

According to one aspect of the present invention,

A casting unit for transmitting and receiving power and multiple signals through a coaxial cable;

Powered by the casting unit, and operates under the control of the casting unit includes a subject to be adjusted to deliver the detected image, audio and data signals to the casting unit.

The present invention is characterized by transmitting video, audio, data, and control signals having different frequencies from DC power supplies to one coaxial cable, and detecting and using only the corresponding components as matching capacitors.

Then, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily practice the present invention.

1 is a block diagram of a multiple communication system according to an embodiment of the present invention.

As shown in Figure 1, the multiple communication system according to the embodiment of the present invention,

A casting unit 100 for transmitting and receiving power and matched control signals, video signals, audio signals, and data signals through a coaxial cable;

And a target to be adjusted 200 that receives power from the foundry unit 100 and operates according to the control signal, and transmits the detected image, audio signal, and data signal to the foundry unit 100.

The casting part 100,

A power supply unit 12 receiving power to supply DC power to each unit;

A data processor 110 for matching a control signal according to a user's selection and transmitting the same to a coaxial cable, matching and receiving subtitle related data among signals received from the coaxial cable, and processing the same to output a subtitle;

And a data display unit 120 for matching and receiving the video and audio signals among the signals received from the coaxial cable, and synthesizing and displaying the video and audio signals.

The data processing unit 110,

A switch 1 for receiving a user's selection;

A microcomputer 2 for outputting the input of the switch 1 as two tone frequency signals and outputting the received signal as caption data;

An FM modulator (3) for outputting an FM signal by modulating the output signal of the microcomputer (2);

A matching capacitor (4) for matching the output signal of the FM modulator (3) and transmitting the matching signal through a coaxial cable;

A matching capacitor (11) for receiving an FM signal among the signals received at the coaxial cable (9);

And an FM demodulator 10 for demodulating the FM signal output from the matching capacitor 11 and outputting the demodulated FM signal to the microcomputer 2.

The data display unit 120,

A matching capacitor 8 for matching and receiving video and audio signals among signals received from the coaxial cable;

A high frequency demodulator (7) for high frequency demodulation of the received signal of the matching capacitor (8);

A caption mixer (6) for synthesizing the video signal and the audio signal demodulated by the high frequency demodulator (7) and the caption data received from the microcomputer (2);

And a monitor unit 5 for displaying the signal output from the caption mixer.

The adjustment target unit 200,

A power supply unit 201 receiving power from the coaxial cable 9 and supplying DC power to each unit;

Data processing unit for matching and receiving a control signal received from the coaxial cable (9), driving various sensors and driving stages in accordance with the control signal, fm-modulated signals output from the various sensors to the coaxial cable ( 220);

It includes a video and audio transmission unit 230 for transmitting a high-frequency modulated video and audio over a coaxial cable.

The data processor 220,

A matching capacitor (202) for receiving an FM signal among the signals received from the coaxial cable (9);

An FM demodulator 203 for demodulating and outputting an FM signal output from the matching capacitor 202;

A microcomputer 212 driving various driving devices and sensors according to the output signal of the FM demodulator 203 and receiving and transmitting output signals of various sensors;

An FM modulator 211 outputting an FM signal by outputting the MICOM 212;

And a matching capacitor 210 that transmits the output of the FM modulation unit 211 to match the coaxial cable 9.

The video and audio transmitter 230,

A CD camera and microphone unit 209 which receives an image and an audio signal and outputs an image signal and an audio signal;

A high frequency modulator 208 for high frequency modulating and outputting the video signal and the audio signal;

And a matching capacitor 207 for matching and transmitting the output of the high frequency modulator 208 with a coaxial cable.

Next, the operation of the multiple communication system having such a configuration will be described in detail.

First, when a user applies power to the power supply unit 12 of the casting unit 100, it is transmitted to the power supply unit 201 of the target unit 201 through the coaxial cable (9).

Then, the power supply unit 201 supplies power to each unit including a driving unit 206 including various driving devices such as lighting, a motor, and the like, various sensor units 213, and a microcomputer 212.

Here, the various elements of the sensor unit 213 and the various driving unit 206 are elements that can be known to those skilled in the art, and various modifications and additions are possible and thus will not be described.

On the other hand, while the power is supplied, the user controls the switch 1 in order to control the target to be adjusted 200 by sending an adjustment signal to each driving stage of the various driving units 206.

Then, the switch 1 converts and outputs the control data into two tone frequencies (dual ton) in order to control the target to be adjusted according to the user's control.

Then, the microcomputer 2 pairs the input two tone frequency signals and outputs a pair of 16 sine waves selected from eight columns. At this time, the shape of the control signal output from the microcomputer 2 may be modified into other forms as necessary.

Then, the FM modulator 3 frequency modulates the control signal received for the efficient transmission of the sine wave signal to the frequency band of 88Mhz ~ 108Mhz and outputs it.

The matching capacitor 4 then removes direct current (DC) components for voltage matching and transmits only the purely modulated signal components to the coaxial cable 9.

The matching capacitor 202 then removes direct current (DC) components from the coaxial cable 9 and detects only pure signal components.

The FM demodulator 203 then demodulates the frequency-modulated waveform to detect two tone frequency signals.

Then, the microcomputer 212 converts the two tone frequency signals into binary data that is a binary coded decimal code (BCD CODE) and outputs them to the respective driving stages of the various driving units 206.

Then, each driving stage illuminates according to the control data, or drives the motor to move the target object 200 to be adjusted.

On the other hand, the CD camera and the microphone 209 of the target to be adjusted 200 detects the video and audio, and outputs the video and audio (VIDEO, AUDIO) signals of the camera.

Then, the high frequency modulator 208 modulates the image at high frequency with high frequency for efficient transmission of the signal, and outputs the audio with frequency modulation (FM). In this case, the frequency transmission scheme of the modulated signal may use one of VHF, UHF, or SHF, which is a well-known technique.

The matching capacitor 207 then removes the direct current (DC) component for voltage matching and transmits only the pure signal component to the coaxial cable 9.

The matching capacitor 8 then removes the direct current (DC) component from the coaxial cable 9 and detects only the pure signal component corresponding to one of the types of VHF, UHF or SHF.

Next, the high frequency demodulator 7 demodulates the high frequency signal and outputs the video and audio signals separately.

Then, the caption mixer 6 mixes the image and the received data signal and outputs it to the monitor 5.

On the other hand, the flow of received data for captioning the output of the various sensor units 213 is as follows.

The data signals received by the sensors of the various sensor units 213 that are the drive stages are input to the microcomputer 212.

Then, the microcomputer 212 determines the data to be transmitted and each condition according to the control signal input to the user and serially transmits the corresponding data.

Then, the FM modulation unit 211 frequency modulates the data to a frequency of 88Mhz ~ 108Mhz and outputs.

Next, the matching capacitor 210 removes direct current (DC) components for voltage matching and transmits only pure signal components to the coaxial cable 9.

Then, the matching capacitor 11 removes the direct current (DC) component from the coaxial cable 12 and detects only pure signal components in the frequency band of 88 MHz to 108 MHz.

Next, the FM demodulator 10 demodulates the frequency modulated waveform to detect data.

Then, the microcomputer 2 reads the received data and outputs it to the subtitle mixer 6.

Then, the caption mixer 6 processes the data input from the microcomputer 2 as a caption when outputting the video and audio data input in the above-described process and displays the caption to the user.

Then, the user can view the desired data in the form of video, audio and subtitles through the switch (1).

As described above, in the embodiment of the present invention, the number of cables, weight, and volume can be reduced by transmitting and receiving a power signal, a control signal, a video signal, an audio signal, and a data signal with one coaxial cable.

The process of transmitting and receiving signals in the above process will be described in more detail as follows.

The video signal is amplitude modulated and the audio signal is frequency modulated. When the video signal in which the frequency band from DC to about 4 MHz is present is frequency-modulated on both sides, a transmission band of about 8 MHz is required as shown in FIG. In order to narrow the bandwidth, single sideband amplitude modulation (SSB) can be considered. However, in a video signal that requires a modulation signal up to direct current, it is difficult to make a complete single sideband. Therefore, the residual sideband modulation (VSB: vestigal sideband) of FIG. 3 with the lower sideband up to 1.25MHz is used.

The demodulation output when the residual side band shown in FIG. 3 is received is shown in FIG. 4. When the frequency characteristic of the intermediate frequency amplifier of the receiver is shown in FIG. 5, it can be accurately demodulated as shown in FIG.

The voice carrier (fA) is set to fV + 4.5MHz in Fig. 1.8 (b) to perform frequency modulation. Accordingly, the bandwidth of one channel of television broadcasting is 6 MHz as shown in Fig. 7, and 62 channels are currently allocated between 90 MHz and 770 MHz in Korea. The transmission power of the voice carrier is 1/4 (-6 dB) of the video carrier.

The present invention can be applied to a self-propelled vehicle or a robot by various modifications according to the needs of the user.

As described above, in the embodiment of the present invention, the video signal, the audio signal, the data signal, the control signal, and the power supply between the main adjustment part and the part to be adjusted are all transferred through one coaxial cable, thereby saving power. It is possible to provide multiple communication systems that can reduce the amount of coaxial cables.

Claims (7)

A casting unit for transmitting and receiving a power supply and a plurality of signals through a coaxial cable; And a subject to be adjusted to receive power from the foundry and operate under the control of the foundry to transmit the detected video, audio, and data signals to the foundry. The method of claim 1, The casting part, A power supply unit receiving power to supply DC power to each unit; A data processor for matching a control signal according to a user's selection and transmitting the same to a coaxial cable, matching and receiving subtitle related data among signals received from the coaxial cable, and processing the same to output the subtitle; And a data display unit for matching and receiving video and audio signals among the signals received from the coaxial cable, and synthesizing and displaying the video and audio signals. The method of claim 2, The data processing unit, A switch for receiving a user's selection; A microcomputer outputting the input of the switch as two tone frequency signals and outputting the received signal as caption data; An FM modulation unit for outputting the FM signal by modulating the output signal of the microcomputer; A first matching capacitor for matching the output signal of the FM modulation unit and transmitting the coaxial cable; A second matching capacitor which receives an FM signal among signals received by the coaxial cable; And an FM demodulator for demodulating the FM signal output from the second matching capacitor and outputting the FM signal to the microcomputer. The method of claim 3, The data display unit, A third matching capacitor matching and receiving a video and audio signal among the signals received from the coaxial cable; A high frequency demodulator for high frequency demodulation of the received signal of the third matching capacitor; A caption mixer for synthesizing the video signal and the audio signal demodulated by the high frequency demodulator and the caption data received from the microcomputer; And a monitor configured to display a signal output from the caption mixer. The method of claim 1, The adjustment target portion, A power supply unit receiving power from the coaxial cable and supplying DC power to each unit; A data processor for matching and receiving a control signal received from the coaxial cable, driving various sensors and driving stages according to the control signal, and fm-modulating the signals output from the various sensors to the coaxial cable; A multi-communication system comprising a video and audio transmission unit for transmitting a high frequency modulated video and audio over a coaxial cable. The method of claim 5, The data processing unit, A first matching capacitor which receives an FM signal among signals received by the coaxial cable; An FM demodulator for demodulating and outputting an FM signal output from the first matching capacitor; A microcomputer that drives various driving devices and sensors according to the output signal of the FM demodulator, and receives and transmits output signals of various sensors; An FM modulation unit for outputting the FM signal by modulating the output signal of the microcomputer; And a second matching capacitor configured to transmit an output of the FM modulator to the coaxial cable. The method of claim 6, The video and audio transmitter, CD camera and microphone unit for receiving video and audio and outputting video and audio signals; A high frequency modulator for high frequency modulating and outputting the video signal and the audio signal; And a third matching capacitor for matching and transmitting the output of the high frequency modulator with a coaxial cable.