CN101521788A - Wireless audio frequency and image modem - Google Patents
Wireless audio frequency and image modem Download PDFInfo
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- CN101521788A CN101521788A CN200810033835A CN200810033835A CN101521788A CN 101521788 A CN101521788 A CN 101521788A CN 200810033835 A CN200810033835 A CN 200810033835A CN 200810033835 A CN200810033835 A CN 200810033835A CN 101521788 A CN101521788 A CN 101521788A
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Abstract
The invention provides a wireless audio frequency and image modem, which is a piece of data modulation/demodulation equipment realizing image transmission in a traditional narrow-band audio frequency broadcasting station by taking audio frequency as data carrier and adopting special encoding and decoding and modulating mode. Mainly used under the special or emergency conditions, the wireless audio frequency and image modem is a piece of special equipment realizing the remote wireless image transmission and can provide technical support for the emergency command, rushing to deal with emergencies, seeking for assistance, special industry management, ocean and air traffic service management and the like when the fixed network or wired communication fails to be implemented in a specific local environment. The main technical principle of the wireless audio frequency and image modem is: the audio frequencies are taken as carrier signals; data partitioning is adopted as a main feature; control codes are used as means; a transmission at different quantities is adopted and a data synthesis is carried out at a receiving terminal. A circuit for the wireless audio frequency and image modem is characterized in that the image data are partitioned by a code controller and an encoder; after modulation, the audio frequencies of the broadcasting station is transmitted as carrier; and the decoding and synthesis are carried out after the data demodulation at the receiving terminal.
Description
Wireless audio frequency and image modem is a kind of communication equipment by conventional audio radio station images, is the small-sized digital modems that is used to connect video capture device and audio frequency radio station.
Wireless audio frequency and image modem is to be used to solve the real-time synchronous images means of transportation that departments such as transport by sea, aviation, ground observation, electric power transfer monitoring implement remote wireless monitoring and management, especially under accident, the major natural disasters condition, wired or fixed network communication can't the situation of operate as normal under, can pass photo site back headquarter timely, provide first-hand in-situ data for the leader is resolute.
Suitable radio station has: various vehicle-mounted, airborne, carrier-borne, individual soldier's portable stations.
The objective of the invention is to solve the invisible problem of hearing that exists in traditional remote station communication, carry out the special equipment of battlefield and image scene transmission for units such as army, public security, People's Armed Police.For relevant industry provides remote wireless image monitoring, also can when handling accident, natural calamity, provide the transmission of remote scene picture for government and relevant administrative department.
The technical solution adopted in the present invention is:
With the picture signal that video capture device produced, after coding, modulation, be carrier wave with the voice-grade channel, carry out long distance wireless and transmit, carry out demodulation, decoding, demonstration the recipient.
The concrete technical measures that the present invention takes are:
Modulation and code device: video capture device is obtained picture signal, through the laggard line number word code of image preprocessor, encrypt comprehensively modulation, shaping, carry out secondary with system coding software again and comprehensively modulate, form audio carrier signal, the voice-grade channel by the radio station transmits.
Demodulation sign indicating number device: the audio carrier signal that the radio station is received sends decoder to through after the demodulation, through automatic checkout system the signal that receives is carried out verification, and last decoding and displaying goes out original image.For adapting to the radio station of different frequency, produce the local oscillation signal of different frequency by the baseband signal generator of software-controllable.
Because the receiving terminal wireless channel can not be under the perfect condition,, provide the image transmission quality in order under the situation of certain signal to noise ratio, to reduce the error rate.Carry out filtering, demodulation, decoding at receiving terminal, obtain the high-fidelity signal, then this signal is carried out the A/D conversion, obtain, again this digital signal and difference error correcting code are carried out secondary frequency multiplication relatively, improve the error control level, reduce the error rate digital signal.
In encoder, matrix circuit carries out linear combination by coding controller and produces S1, S2, S3 baseband signal and K coded identification signals.Because S1, S2, the frequency characteristic difference of three passages of S3, thereby, add different control signals in the S3 passage respectively at S2, so that in the end during composite signal, the three is mated on time relationship.
Subcarrier forms the usefulness of three different subcarriers of circuit difference output phase for modulator, simultaneous equation modulator.Controlled CPU is according to S1, and the sampling pulse that S2, three signals of S3 are corresponding respectively synthesizes signal output through frequency mixer.
In decoder, by demultiplexer, isolate three unlike signal R1, R2, R3 and coded identification signals K after synthetic after decode controller and the control signal, output to the synthetic matrix of signal.Because R1, R2, the phase modulation difference of R3 is carried out phase shift by phase controller.
The schematic diagram of accompanying drawing 1:BZ wireless audio frequency and image modem
Accompanying drawing 2:BZ wireless audio frequency and image modem coding principle figure
Accompanying drawing 3:BZ wireless audio frequency and image modem decoding schematic diagram
Execution mode:
Entire machine design is become printed circuit board (PCB), will divide fitting to be welded on the circuit board, the special function integrated circuit patches by design attitude, and Control Software and encrypting module write in embedded mode, carries out comprehensive debugging at last.
Claims (5)
1. modulation equipment to use in the arrowband image transmission of audio frequency as carrier wave,--coding--modulation--control system---output that it is characterized in that: complete machine is made up of modulation and demodulation two parts, and the circuit of its modulating part is in proper order: processed image matrix; The circuit of its demodulation part is received signal in proper order--decomposes--demodulation--signal is synthetic---output.
2. according to claim 1, its key point is:, image is carried out polylith cut apart transmission as baseband modulation signal with audio signal, synthesize according to cutting apart control code at receiving terminal.
3. according to claim, it is characterized in that: in the cataloged procedure data are divided into different signal components, behind the control-register sign indicating number, transmit, synthesize according to control code and the component that receives at receiving terminal.
4. according to claim 1, its encoder operating circuit connection is: image processing matrix-coding controller-signal component S1-K; S2-S3-D-modulator-frequency mixer-output.
5. according to claim 1, the operating circuit connection of its decoder is: signal receiver-decode controller-signal component R1-K, R2-R3-D-demodulator-output matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810033835A CN101521788A (en) | 2008-02-25 | 2008-02-25 | Wireless audio frequency and image modem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810033835A CN101521788A (en) | 2008-02-25 | 2008-02-25 | Wireless audio frequency and image modem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101521788A true CN101521788A (en) | 2009-09-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810033835A Pending CN101521788A (en) | 2008-02-25 | 2008-02-25 | Wireless audio frequency and image modem |
Country Status (1)
| Country | Link |
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| CN (1) | CN101521788A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103905144A (en) * | 2012-12-27 | 2014-07-02 | 上海协同科技股份有限公司 | 16-level high-speed narrow-band modem |
| CN106448630A (en) * | 2016-09-09 | 2017-02-22 | 腾讯科技（深圳）有限公司 | Method and device for generating digital music file of song |
-
2008
- 2008-02-25 CN CN200810033835A patent/CN101521788A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103905144A (en) * | 2012-12-27 | 2014-07-02 | 上海协同科技股份有限公司 | 16-level high-speed narrow-band modem |
| CN103905144B (en) * | 2012-12-27 | 2018-11-23 | 上海协同科技股份有限公司 | 16 level high-speed narrow-band modems |
| CN106448630A (en) * | 2016-09-09 | 2017-02-22 | 腾讯科技（深圳）有限公司 | Method and device for generating digital music file of song |
| CN106448630B (en) * | 2016-09-09 | 2020-08-04 | 腾讯科技（深圳）有限公司 | Method and device for generating digital music score file of song |
| US10923089B2 (en) | 2016-09-09 | 2021-02-16 | Tencent Technology (Shenzhen) Company Limited | Method and apparatus for generating digital score file of song, and storage medium |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20090902 |