CN102195753A - 2.4G-radio-frequency (2.4GRF)-based multimedia transmission method - Google Patents

2.4G-radio-frequency (2.4GRF)-based multimedia transmission method Download PDF

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Publication number
CN102195753A
CN102195753A CN2011100985368A CN201110098536A CN102195753A CN 102195753 A CN102195753 A CN 102195753A CN 2011100985368 A CN2011100985368 A CN 2011100985368A CN 201110098536 A CN201110098536 A CN 201110098536A CN 102195753 A CN102195753 A CN 102195753A
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China
Prior art keywords
data
transmission
transmitting
response
receiving terminal
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Pending
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CN2011100985368A
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Chinese (zh)
Inventor
雷琳
陈新
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WUXI LEZHI TECHNOLOGY Co Ltd
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WUXI LEZHI TECHNOLOGY Co Ltd
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Priority to CN201010581059.6 priority Critical
Priority to CN201010581059 priority
Application filed by WUXI LEZHI TECHNOLOGY Co Ltd filed Critical WUXI LEZHI TECHNOLOGY Co Ltd
Priority to CN2011100985368A priority patent/CN102195753A/en
Publication of CN102195753A publication Critical patent/CN102195753A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a 2.4G-radio-frequency (2.4GRF)-based multimedia transmission method, which relates to wireless high frequency transmission. The 2.4GRF-based multimedia transmission method is characterized by comprising that: mode setting is performed on a corresponding RF mode; a transmitter performs cyclic redundancy check (CRC) transmits data, waits for the response of a receiver, finishes the transmission if the receiver makes a correct response, and hops to the next frequency band and repeats the transmission process if not receiving the response; the transmitter in a receiving mode checks whether a current carrier frequency point receives the data or not; if the current carrier frequency point receives the data, the receiver performs CRC computation, returns the correct response if the data is checked to be correct, otherwise returns a check error response and waits for the retransmission of the data; if the current carrier frequency point does not receive the data, the receiver hops to the next frequency point and repeats the steps; and before the transmission is started, the transmitter and the receiver both enter a code checking state and reduce own transmission power, and after correct 'handshaking', the receiver records the working frequency band and radio frequency identifier of the transmitter, and recovers normal power after the code checking is finished. The method is low in cost and high in efficiency; in addition, low power consumption and higher security are ensured.

Description

Multimedia transmission method based on 2.4GRF
Technical field
The present invention relates to a kind of 2.4G RF host-host protocol, be used for carrying out between 2.4G transmitting terminal and the receiving device multi-medium data transmission such as audio frequency and video.
Background technology
When coming into people's life along with Internet of Things, the RF technology is also more and more used.Present modal wireless technology comprises bluetooth (Bluetooth), WiFi, ZigBee and proprietary protocol.
The Bluetooth technology long transmission distance, safe, but the high request aspect microprocessor and agreement permission makes product price high always, still is difficult to bear concerning domestic most of consumer.
Though ZigBee has reduced power consumption and cost, transmission speed is low, can only reach the bandwidth of 200kbps, can't reach the bandwidth requirement of transmission tone video data.
WiFi is maximum a kind of technology of using in the present 2.4G wireless transmission, and it is compared with Bluetooth technology, not only has higher transmission speed, has high good transmission range simultaneously, under the environment of spaciousness, can transmit 200 meters farthest.But it is low that the greatest problem that WiFi faces is fail safe, and power consumption is big.
Because the 2.4G frequency range does not have the use authority restriction, household electrical appliance, mobile phone, wireless network all concentrate on this frequency range at present, and interference problem is difficult to avoid.How to avoid in family market easily with other wireless transmission between (as bluetooth Bluetooth, HomeRF) disturbed problem into primary solution.
Simultaneously, a kind of frequency hopping (Frequency-Hopping Spread Spectrum is arranged at present in the 2.4G communications field; FHSS), be with certain frequency range it to be divided into several radio frequency channel (Radio Frequency Channel at the 2.4GHz frequency band; RFC), and to use receive with the same frequency agility pattern (Frequency Hopping) in transmission two ends to come the sending and receiving signal and prevent data acquisition.Its operation principle is that the carrier wave of receiving-transmitting sides transmission signals carries out Discrete Change according to predetermined rule, avoids disturbing to reach, and finishes the purpose of transmission.
Thus, we as can be known, prior art is carried out transfer of data, particularly multimedia transmission based on 2.4GRF and is still had technology barrier: mainly be interference, energy consumption and safety problem, and the frequency modulation technology utilization that is not optimized in this application as yet.
Summary of the invention
The objective of the invention is to overcome the defective of the described existing transmission method of background technology,, invent a kind of multimedia transmission method based on 2.4GRF in conjunction with frequency modulation technology.
Use 2.4GRF to carry out the interoperation that multimedia transmission needs transmitting terminal and receiving terminal, method of the present invention is: after the device power, at different equipment, corresponding RF module is carried out the pattern setting; The RF module of transmitting terminal is set to emission mode; Transmitting terminal carries out CRC check to the data that will send, and data are sent, and waits for the response of receiving terminal, as receives correct response, and then end data sends; As do not receive response, and then jump to next frequency range, repeat this process of transmitting.If in official hour, do not receive correct response, illustrate that then receiving terminal is in off-mode, or current wireless signal serious interference.The RF module of receiving terminal then is set to receiving mode, and checks whether current carrier frequency point receives data.As receive data, and then carry out the CRC calculation check, correctly then reply correct response, otherwise reply the check errors response, wait for data re-transmitting.If do not receive and data then jump to next frequency, repeat above-mentioned steps.And, before transmitting terminal and receiving terminal begin the application data transmission, transmitting terminal and receiving terminal all enter " to sign indicating number " state, reduce the transmitting power of transmitting terminal and receiving terminal, transmitting terminal is after a certain frequency range and receiving terminal carry out correctly " shaking hands ", receiving terminal will be remembered the working frequency range and the RFID of this transmitting terminal, recover normal power after sign indicating number is finished.
Present technique adopts the advantage combine frequency modulation technology, to the code efficiency height, and fixes by the distribution to band limits, can realize one road receiving terminal transfer of data of corresponding multichannel transmitting terminal simultaneously, and cost is low, efficient is high.In addition, used the method that reduces power, reduced power consumption, and simplified independence, less demanding to microprocessor, whole cost is lower, and fail safe is also higher, helps the highly-reliable transmission to the audio, video data of transmission.
Description of drawings
Fig. 1, transmitting terminal of the present invention, receiving terminal multi-medium data transfer process figure.
Fig. 2, transmitting terminal of the present invention, receiving terminal reduction frequency are carried out the flow chart to sign indicating number.
Embodiment
Below in conjunction with accompanying drawing, the implementation procedure of clearer explanation the inventive method:
As Fig. 1, use the hyperfrequency of 2.4G to carry out transfer of data, need the interoperation of transmitting terminal and receiving terminal, finish a transmission, receiving course, and " to sign indicating number " process of intermediate demand.
Receive the experience step from sending to:
Transmitting terminal:
1, power-up initializing, configuration transmitting terminal RF module status is an emission mode, prepares to be about to the data of transmission;
2, calculate the CRC check that sends data, and send data;
3, judge whether transmitting terminal receives answer signal,, then send data to serial ports if receive answer signal; Otherwise, then switch to next frequency and send data once more;
4, repeating step 3;
If 5 in a Preset Time 2 seconds within, still do not receive answer signal, illustrate that receiving terminal has shut down or is in serious disturbance state, this moment, transmitting terminal stopped to send data;
Receiving terminal:
1, power-up initializing, and configuration RF module is a receiving mode;
2, detected carrier signal; Judge whether to exist the carrier signal of current frequency;
If 3 receive packet, judge whether CRC check is correct, as correctly, then finish; Be CRC check failure, request repeat otherwise reply;
If 4 do not receive packet, then jump to next frequency, repeating step 2.
Here, the inventive method can realize one road receiving terminal corresponding multichannel transmitting terminal simultaneously, and the transmitting terminal quantity that one road receiving terminal is corresponding simultaneously is preferably four the tunnel.The main means that realize are exactly: carry out " to sign indicating number " with frequency modulation technology, and make receiving terminal " remember " RFID and the band limits of this transmitting terminal, different transmitting terminals is fixed a relative band limits, then can remember and distinguish different transmitting terminals.
Simultaneously, as the flow process of Fig. 2, before to sign indicating number, the transmitting power of transmitting terminal and receiving terminal is reduced, make it can only search for 2 meters of diameters, avoid the interference of signal between a plurality of receiving terminals with interior signal, after treating " to sign indicating number " success, recover normal power again, to guarantee the coverage of signal transmission.

Claims (3)

1. based on the multimedia transmission method of 2.4GRF, it is characterized in that: after the device power,, corresponding RF module is carried out the pattern setting at different equipment; The RF module of transmitting terminal is set to emission mode; Transmitting terminal carries out CRC check to the data that will send, and data are sent, and waits for the response of receiving terminal, as receives correct response, and then end data sends; As do not receive response, and then jump to next frequency range, repeat this process of transmitting;
If in official hour, do not receive correct response, illustrate that then receiving terminal is in off-mode, or current wireless signal serious interference;
The RF module of receiving terminal then is set to receiving mode, and checks whether current carrier frequency point receives data; As receive data, and then carry out the CRC calculation check, correctly then reply correct response, otherwise reply the check errors response, wait for data re-transmitting; If do not receive and data then jump to next frequency, repeat above-mentioned steps;
And, before transmitting terminal and receiving terminal begin the application data transmission, transmitting terminal and receiving terminal all enter " to sign indicating number " state, reduce the transmitting power of transmitting terminal and receiving terminal, transmitting terminal is after a certain frequency range and receiving terminal carry out correctly " shaking hands ", receiving terminal will be remembered the working frequency range and the RFID of this transmitting terminal, recover normal power after sign indicating number is finished.
2. the multimedia transmission method based on 2.4GRF according to claim 1 is characterized in that: the corresponding data that receive four road transmitting terminals of one road receiving terminal.
3. the multimedia transmission method based on 2.4GRF according to claim 1 is characterized in that: the time of waiting for correct response is 2 seconds.
CN2011100985368A 2010-12-09 2011-04-20 2.4G-radio-frequency (2.4GRF)-based multimedia transmission method Pending CN102195753A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201010581059.6 2010-12-09
CN201010581059 2010-12-09
CN2011100985368A CN102195753A (en) 2010-12-09 2011-04-20 2.4G-radio-frequency (2.4GRF)-based multimedia transmission method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011100985368A CN102195753A (en) 2010-12-09 2011-04-20 2.4G-radio-frequency (2.4GRF)-based multimedia transmission method

Publications (1)

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CN102195753A true CN102195753A (en) 2011-09-21

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103236145A (en) * 2013-03-29 2013-08-07 上海华兴数字科技有限公司 Frequency modulation method for engineering machinery wireless remote controller
CN104159324A (en) * 2014-09-09 2014-11-19 苏州卓永信息技术有限公司 Data transmission method on basis of 433MhzRF
CN104995874A (en) * 2012-12-20 2015-10-21 罗伯特·博世有限公司 Data transmission protocol with protocol exception state
CN104995873A (en) * 2012-12-20 2015-10-21 罗伯特·博世有限公司 Data transmission using a protocol exception state
CN109309540A (en) * 2018-08-16 2019-02-05 广州市星翼电子科技有限公司 A kind of anti-tampering 2.4G is wireless MCU emulator and emulation mode
CN109787654A (en) * 2019-03-15 2019-05-21 广州市星翼电子科技有限公司 A kind of wireless communications method based on the anti-tampering technology of frequency hopping
CN110815223A (en) * 2019-11-14 2020-02-21 哈尔滨玄智科技有限公司 Robot wireless control method and system

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CN101868991A (en) * 2007-11-21 2010-10-20 高通股份有限公司 Source initiated communication handover

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104995874B (en) * 2012-12-20 2019-11-05 罗伯特·博世有限公司 Data Transport Protocol with protocol anomaly state
CN104995874A (en) * 2012-12-20 2015-10-21 罗伯特·博世有限公司 Data transmission protocol with protocol exception state
CN104995873A (en) * 2012-12-20 2015-10-21 罗伯特·博世有限公司 Data transmission using a protocol exception state
CN104995873B (en) * 2012-12-20 2020-01-21 罗伯特·博世有限公司 Data transmission using protocol exception state
CN103236145A (en) * 2013-03-29 2013-08-07 上海华兴数字科技有限公司 Frequency modulation method for engineering machinery wireless remote controller
CN103236145B (en) * 2013-03-29 2015-12-23 上海华兴数字科技有限公司 The frequency modulation method of engineering machinery Digiplex
CN104159324A (en) * 2014-09-09 2014-11-19 苏州卓永信息技术有限公司 Data transmission method on basis of 433MhzRF
CN109309540A (en) * 2018-08-16 2019-02-05 广州市星翼电子科技有限公司 A kind of anti-tampering 2.4G is wireless MCU emulator and emulation mode
CN109787654A (en) * 2019-03-15 2019-05-21 广州市星翼电子科技有限公司 A kind of wireless communications method based on the anti-tampering technology of frequency hopping
CN110815223A (en) * 2019-11-14 2020-02-21 哈尔滨玄智科技有限公司 Robot wireless control method and system
CN110815223B (en) * 2019-11-14 2021-05-14 哈尔滨玄智科技有限公司 Robot wireless control method and system

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Application publication date: 20110921