CN114071029A - Short-distance video transmission system based on wireless transmission technology - Google Patents
Short-distance video transmission system based on wireless transmission technology Download PDFInfo
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- CN114071029A CN114071029A CN202010783438.7A CN202010783438A CN114071029A CN 114071029 A CN114071029 A CN 114071029A CN 202010783438 A CN202010783438 A CN 202010783438A CN 114071029 A CN114071029 A CN 114071029A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 43
- 238000005516 engineering process Methods 0.000 title claims abstract description 11
- 238000004891 communication Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 230000005236 sound signal Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 2
- 230000003993 interaction Effects 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
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- 230000002452 interceptive effect Effects 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/265—Mixing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a short-distance video transmission system based on a wireless transmission technology, which comprises a camera, a slave node, a master node and a display end, wherein the slave node comprises a wireless transmitting module and a character superimposer, the camera transmits a video signal to the character superimposer, the character superimposer mixes character information into the video signal and transmits processed signal data to the wireless transmitting module, the wireless transmitting module comprises an audio frequency conversion oscillating circuit and a frequency mixing circuit, the master node comprises a wireless receiving module, and the wireless receiving module selects a full-channel high-frequency head to receive the data transmitted by the wireless transmitting module and transmits the received data to the display end. The invention utilizes the camera, the wireless transmission receiving and transmitting module and the character superimposer to form a short-distance video signal wireless communication network to complete the transmission of the analog video signal, has simple operation and strong anti-interference capability, and can transmit the video signal in real time.
Description
Technical Field
The invention relates to the technical field of wireless transmission, in particular to a short-distance video transmission system based on a wireless transmission technology.
Background
Short-distance wireless communication has the characteristics and advantages of low cost, low power consumption, peer-to-peer communication and the like, and is widely applied to daily life of people nowadays, such as wireless intelligent home, wireless meter reading, wireless dish ordering, wireless data acquisition, wireless equipment management, wireless reading of monitoring automobile instrument data and the like.
With the wide application of wireless video transmission in the current society, the requirements of wireless video transmission on transmission quality, transmission rate and the like are higher and higher. However, short-range wireless video transmission is still insufficient in transmission quality and rate.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a short-distance video transmission system based on a wireless transmission technology, a short-distance video signal wireless communication network is formed by utilizing a camera, a wireless transmission receiving and transmitting module and a character superimposer, the voice transmission of analog video signals is completed, the operation is simple, the anti-interference capability is strong, and the video signals can be transmitted in real time.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention relates to a short-distance video transmission system based on a wireless transmission technology, which comprises a camera, a slave node, a master node and a display end, wherein the slave node comprises a wireless transmitting module and a character superimposer, the camera transmits a video signal to the character superimposer, the character superimposer mixes character information in the video signal and transmits processed signal data to the wireless transmitting module, the wireless transmitting module comprises an audio frequency conversion oscillating circuit and a frequency mixing circuit, the audio frequency conversion oscillating circuit takes a triode Q1 as a core, the audio signal is coupled to a base electrode of a triode Q1 through a resistor R3 and a capacitor C3, a high-frequency accompanying audio carrier frequency signal is generated through the conversion of the triode Q1 and then is output by a secondary electrode of a middle-period transformer T and is coupled to an emitting electrode of a frequency mixing tube Q3 through a capacitor C10 and an induction coil I111, the frequency mixing circuit takes the frequency mixing tube Q3 as a core, the main node comprises a wireless receiving module, the wireless receiving module receives data sent by the wireless transmitting module through a full-channel high-frequency head, and sends the received data to a display end.
As a preferred technical scheme of the invention, the character superimposer comprises an ARM processor and a character superimpose module, wherein the ARM processor comprises an SPI protocol, an I2C protocol and a serial communication protocol, the ARM processor performs data interaction with the camera through the serial communication protocol, the ARM processor reads and writes character data through I2C protocol external connection equipment, and the ARM processor and the character superimpose module perform serial communication through the SPI protocol.
As a preferred technical scheme of the invention, the ARM processor further comprises an ADC analog-to-digital conversion module and a timing module, and a minimum system of the ARM processor consists of a crystal oscillator circuit and a reset circuit.
As a preferred technical solution of the present invention, the ARM processor writes data into the memory in the character superimposition module through the SP1 protocol, continues to write a character display address into the character superimposition module after waiting for a short delay, and finally configures data to perform character superimposition display.
As a preferred technical solution of the present invention, the wireless transmitting module is respectively provided with pin signals of different levels, and the wireless receiving module is provided with pin signals corresponding to the wireless transmitting module.
Compared with the prior art, the invention has the following beneficial effects:
the invention has the advantages of high transmission speed within 5 meters of transmission distance, clear video quality, increased transmission distance during relay test, good transmission quality, and capability of being combined with smart homes and Internet of things, thereby improving the transmission quality, transmission time and transmission efficiency of the wireless video technology.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a circuit diagram of a wireless transmission module of the present invention;
in the figure: 1. a camera; 2. a slave node; 3. a master node; 4. a display end; 5. a wireless transmitting module; 6. a character superimposer; 7. a wireless receiving module; 8. an ARM processor; 9. and a character superposition module.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In addition, if a detailed description of the known art is not necessary to show the features of the present invention, it is omitted.
Examples
As shown in fig. 1-2, the present invention provides a short-distance video transmission system based on a wireless transmission technology, which includes a camera 1, a slave node 2, a master node 3 and a display terminal 4, wherein the slave node 2 includes a wireless transmitting module 5 and a character superimposer 6, the camera 1 sends a video signal to the character superimposer 6, the character superimposer 6 mixes character information into the video signal and sends the processed signal data to the wireless transmitting module 5, the wireless transmitting module 5 includes a power supply part, an audio frequency conversion oscillating circuit and a mixing circuit, and the power supply part: alternating current 220V mains supply generates about 12V alternating voltage after passing through a transformer, the alternating voltage is subjected to half-wave rectification by a diode VD1, and then direct current voltage of about 12V is generated by rectification filtering to supply power for a power indicator VD 3;
audio frequency conversion oscillating circuit: with Q1 as a core, an audio signal is coupled to the base of Q1 through R3 and C3, a high-frequency audio carrier frequency signal is generated through the transformation of Q1 and then is output by the secondary of the middle period T, and is coupled to the emitter of a mixing tube Q3 through C10 and I111;
a mixer circuit: the radio frequency output circuit takes Q3 as a core and has the function of mixing a local oscillator signal (input by a base) with a video signal (input by an emitter) and an audio carrier frequency signal (input by the emitter) into a whole so as to generate a radio frequency television signal which is output from a collector and used for a television tuner, the main node 3 comprises a wireless receiving module 7, the wireless receiving module 7 is used for a TDQ3 type full-channel tuner, and the frequency range is 87 HZ-860 HZ. The tuning potentiometer W is a more precise multi-coil winding potentiometer, which is beneficial to tuning precision. The block mainly consists of three parts of circuits: the image intermediate frequency circuit, the accompanying sound intermediate frequency circuit and the mute circuit, and send the received data to the display terminal 4.
Furthermore, the camera passes through AV line and slave node serial ports and is connected, wherein, character superimposer 6 includes ARM treater 8 and character superimposition module 9, and ARM treater 8 selects the chip that the model is STM32F103C8T6, and functions such as timer, from taking ADC analog-to-digital conversion, SPI communication protocol, I2C agreement, USB commentaries on classics serial ports and serial ports have been integrateed to this chip inside. The highest working frequency can reach 72 MHZ.
The minimum system of STM32F103C8T6 is composed of a crystal oscillator circuit and a reset circuit, has low power consumption and dual sleep modes, an external crystal 3.768KHz is used in the sleep mode, and the frequency of 8MHz is STM32 used in frequency multiplication, and can be multiplied to 72MHz at most by the configuration of an internal clock bus. When the switch in the reset circuit is pressed, the level of the reset pin of the single chip microcomputer is pulled down, and the single chip microcomputer is reset to reload programs.
The MAX7456 character overlay module is suitable for transmission of NTSC and PAL video signals, and includes sync separator, E2PR0M, display memory, OSD insertion multiplexer, SPI communication interface, etc.
The display of the video is mainly to superpose the characters on the basis of the video signals through the control of the microcontroller, and the serial communication is carried out between the controller and the character superposition chip through the SPI protocol.
Initializing a relevant peripheral pin clock, writing data into the MAX7456 memory through an SP1 protocol, continuously writing a character display address into the MAX7456 memory after waiting for a short delay, and finally configuring data for displaying character superposition.
The MAX7456 may be programmed online via the SPI interface, and its operating mode, display memory, and character memory may be set via the SPI. The SPI pulls the CS port low when writing to the register. Data is read from SDIND at the rising edge of SCLK and latched into the input register when CS goes high. If the CS becomes high during the transmission, the procedure is terminated. After CS goes low, the device reads in the first byte from SDIN. The data is read in continuously in a circulating way, and the transmission of the whole data is completed.
When reading the register, first the CS chip select signal is pulled low, the address is locked into SDIN at the rising edge of SCLK, and then the data will be output from SDOUT at the falling edge of SCLK. And the command length of the SPI is typically 16 bits, the upper 8 bits are the register address and the lower 8 bits are the data bits.
In order to enable video signals to be transmitted in different frequencies without interfering with each other, the BX pin signal and the CH1, CH2, CH3, and CH4 pin signals on the wireless transmitting module are respectively set to different levels, and the frequency of the wireless receiving module and the frequency of transmission need to be kept consistent to ensure the reception of wireless signals, and the setting method of the receiving module and the setting method of the wireless transmitting module are consistent.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A short-distance video transmission system based on a wireless transmission technology is characterized by comprising a camera (1), a slave node (2), a master node (3) and a display end (4), wherein the slave node (2) comprises a wireless transmitting module (5) and a character superimposer (6), the camera (1) sends a video signal to the character superimposer (6), the character superimposer (6) mixes character information in the video signal and sends processed signal data to the wireless transmitting module (5), the wireless transmitting module (5) comprises an audio frequency conversion oscillating circuit and a mixing circuit, the audio frequency conversion oscillating circuit takes a triode Q1 as a core, the audio signal is coupled to a base electrode of a triode Q1 through a resistor R3 and a capacitor C3, a high-frequency audio carrier frequency signal is generated through the conversion of the triode Q1 and then is output by a secondary side of a middle-cycle transformer T, the frequency mixing circuit is coupled to an emitting electrode of a frequency mixing tube Q3 through a capacitor C10 and an induction coil I111, the frequency mixing circuit takes a frequency mixing tube Q3 as a core, local oscillation signals input by a base electrode, video signals input by the emitting electrode and accompanying sound carrier frequency signals are mixed into a whole, radio frequency television signals are generated and output from a collecting electrode and selected by a high frequency head, the main node (3) comprises a wireless receiving module (7), the wireless receiving module (7) selects a full-channel high frequency head to receive data sent by the wireless transmitting module (5), and the received data are sent to a display end (4).
2. The short-distance video transmission system based on the wireless transmission technology as claimed in claim 1, wherein the character superimposer (6) comprises an ARM processor (8) and a character superimpose module (9), the ARM processor (8) comprises an SPI protocol, an I2C protocol, and a serial communication protocol, the ARM processor (8) performs data interaction with the camera (1) through the serial communication protocol, the ARM processor (8) reads and writes character data through an I2C protocol external connection device, and the ARM processor (8) and the character superimpose module (9) perform serial communication through the SPI protocol.
3. A short distance video transmission system based on wireless transmission technology as claimed in claim 2, characterized in that said ARM processor (8) further comprises ADC analog-to-digital conversion module and timing module, and the minimum system of said ARM processor (8) is composed of crystal oscillator circuit and reset circuit.
4. The system according to claim 2, wherein the ARM processor (8) writes data into the memory of the character overlay module (9) via the SP1 protocol, continues to write character display addresses into the character overlay module (9) after waiting for a short delay, and finally configures the data for character overlay display.
5. The system according to claim 1, wherein the wireless transmitting module (5) has pin signals with different levels, and the wireless receiving module (7) has pin signals corresponding to the wireless transmitting module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010783438.7A CN114071029A (en) | 2020-08-06 | 2020-08-06 | Short-distance video transmission system based on wireless transmission technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010783438.7A CN114071029A (en) | 2020-08-06 | 2020-08-06 | Short-distance video transmission system based on wireless transmission technology |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87205864U (en) * | 1987-03-28 | 1988-11-02 | 吴镇敏 | Sound converter for tv set |
| CN105702138A (en) * | 2014-11-23 | 2016-06-22 | 上海莞东拿信息科技有限公司 | High-frequency circuit practical training device |
| CN205453897U (en) * | 2016-04-09 | 2016-08-10 | 陈福安 | Dual signal mixer circuit |
| CN205510270U (en) * | 2016-01-03 | 2016-08-24 | 广东海洋大学 | Short distance video wireless communication system |
| CN108184100A (en) * | 2018-01-22 | 2018-06-19 | 中原工学院 | A kind of multipoint wireless Video transmission system |
-
2020
- 2020-08-06 CN CN202010783438.7A patent/CN114071029A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87205864U (en) * | 1987-03-28 | 1988-11-02 | 吴镇敏 | Sound converter for tv set |
| CN105702138A (en) * | 2014-11-23 | 2016-06-22 | 上海莞东拿信息科技有限公司 | High-frequency circuit practical training device |
| CN205510270U (en) * | 2016-01-03 | 2016-08-24 | 广东海洋大学 | Short distance video wireless communication system |
| CN205453897U (en) * | 2016-04-09 | 2016-08-10 | 陈福安 | Dual signal mixer circuit |
| CN108184100A (en) * | 2018-01-22 | 2018-06-19 | 中原工学院 | A kind of multipoint wireless Video transmission system |
Non-Patent Citations (1)
| Title |
|---|
| 华强电子网: "AV-射频转换器的工作原理分析", pages 2 - 4, Retrieved from the Internet <URL:https://m.hqew.com/tech/news_1071540?d=123> * |
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Application publication date: 20220218 |