CN105790854A - Short distance data transmission method and device based on sound waves - Google Patents
Short distance data transmission method and device based on sound waves Download PDFInfo
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Abstract
The invention relates to a short distance data transmission method and device based on sound waves. The method comprises the following steps: inputting to-be-transmitted data; determining a total number of frequency bands and the number of extracted frequency bands according to the types of to-be-transmitted data symbols; making a codebook, and mapping the data symbols to corresponding code words in the codebook; synthesizing the sound waves according to the input code words; playing the synthetic sound waves; obtaining the played sound waves; obtaining the sound wave in a target frequency band in the obtained sound waves; mapping the extracted sound wave, and decoding the data symbols according to a mapping relation of the code words and the data symbols; and carrying out data connection by the decoded data symbols to obtain a continuous data string. The short distance data transmission method provided by the invention has the beneficial effects of realizing high-quality data transmission between devices of a pickup and a loudspeaker, having relatively strong anti-noise performance, having strong adaptability to microphone properties and loudspeaker properties of different devices, and being simple in operation and low in requirements on communication devices.
Description
(1) technical field
The invention belongs to wireless communication technology field, particularly to a kind of short range data transmission method based on sound wave and device.
(2) background technology
Cable-network transmission method, such as twisted-pair feeder, coaxial cable, optical fiber etc., transmission is reliable and at a high speed.But the equipment that is as develops to miniaturization and mobile, is then embodied greater advantage by transmitting information wirelessly, for instance at wireless network camera, smart mobile phone, wearable device etc., it is necessary to use radio transmitting method.
Conventional wireless network transmission method, such as WiFi, Bluetooth, ZigBee, NFC etc. are required for application specific hardware modules and support, transmission low volume data in relatively costly, and every kind of communication mode all existing defects: such as, WiFi mode must have a hot spot device, and in interaction, near focus in a big way can intercepted data bag, there is potential safety hazard；The direct-connected mode of WiFi needs equipment to monopolize WiFi, disconnects original WiFi link, and Consumer's Experience is very poor；The sequence of operations such as Bluetooth mode then needs, through manual search, to connect and confirm, coupling connection, in low volume data transmitting procedure, user operation is too complicated.
In order to supplement wire transmission method and the deficiency of traditional radio transmitting method, occur in that a kind of method utilizing sonic transmissions data, but current sonic transmissions method also has following defect: frequency of sound wave is fixed, be generally auditory perceptual less than supersonic band or infrasonic wave frequency range；Sound wave modulation intelligence exists severe frequency to be revealed, severe jamming non-targeted sound wave band frequency；Acoustic coded has obvious original position and end position, is unfavorable for information protection；The loudspeaker performance of distinct device end is different, causes that speaker sends sound wave and there is distortion in various degree and hangover, and existing sonic transmissions scheme is not solved by loudspeaker performance compatibling problem.
The application for a patent for invention that application number is 201110277536.4, denomination of invention is " a kind of high reliability data transmission method based on multifrequency sound wave and device " discloses a kind of sonic transmissions method, the method passes through frequency filtering, numeral 0 to 9 is demarcated by different frequency value, employ the different frequency ranges between 15kHz to 22kHz, the waveform of different frequency is contained within each packet cycle, the data of transmission arrive after receiving terminal, and the waveform of the different frequency being reduced is for representing different numeral.Although this method reduces the error rate of data convert, but, the speed of data transmission is relatively fixed, and a kind of definition in 2 systems, 4 systems, 8 systems, 10 systems or 16 system modes of the transmission data acquisition, data transmission is dumb.
The application for a patent for invention that application number is 201210058106.8, denomination of invention is " based on audio frequency or hyperacoustic data communication method and system " discloses a kind of sonic transmissions method, the method is by repeating transmission packet, superposition and data convert accuracy can be improved to a certain extent except making an uproar, but this invention require to repeat transmission times N be positive integer and N more than 1, it is relatively low that this also leads to message transmission rate；And this invention needs normalized in resolution data process, parsing data by threshold value, the selection of threshold value directly affects resolution data correctness, is difficult to find out an optimum threshold value under distinct device, different noise circumstance.
Additionally, the speaker transmitting capacity of distinct device is different with the concordance of microphones ability, such as, reception response sensitivity and the reproducibility of different frequency sound are had dramatically different by different mikes, the frequency response of different speakers there is also obvious difference, and some speaker would be likely to occur " frequency hangover " phenomenon.Therefore, above method is it is difficult to ensure that transmitting terminal accuracy that the acoustic signals of different frequency is sent and the receiving terminal accuracy to signals revivification.
(3) summary of the invention
The present invention is in order to make up the deficiencies in the prior art, provide a kind of short range data transmission method based on sound wave and device, achieve the quality data transmission of the equipment room with pick up and speaker, there is stronger noiseproof feature, distinct device microphone characteristics and loudspeaker performance had very strong adaptability, simple to operate, communication device calls is low.
The present invention is achieved through the following technical solutions:
A kind of short range data transmission method based on sound wave, is characterized in that: comprise the following steps:
(1), data waiting for transmission are inputted；
(2), the kind of data symbol is determined frequency range total quantity F_total and extracts number of frequency bands F_select as required；
(3), make code book according to the frequency range total quantity F_total determined and extraction number of frequency bands F_select, data symbol is mapped to code word corresponding in code book；
(4), according to incoming code word, sound wave is synthesized；
(5) sound wave of synthesis, is play；
(6) sound wave play, is obtained；
(7) in the sound wave obtained, extract the sound wave in target frequency bands；
(8), the sound wave of extraction is mapped, decode data symbol by the mapping relations between code word and data symbol；
(9), carry out data cube computation by the data symbol decoded, obtain continuous print serial data.
Preferably, in step (1), data waiting for transmission are added with and add confidential information.
Preferably, in step (1), data waiting for transmission are added with verification error correction information.
Preferably, in step (2), the kind of data symbol determines modulating frequency F_base and frequency interval F_distance as required.
Preferably, in step (4), add smoothing windows after generating frequency waveform by sinusoidal or cosine generating function and process.
Preferably, in step (4), before or after whole synthetic waveform, add mute signal.
Preferably, in step (7) a metallic, extracting target sound waves and select sliding window to press frame extraction, frame length is less than every section of sound wave duration.
A kind of device for realizing the short range data transmission method based on sound wave, send equipment including sound wave and intelligent network receives equipment, sound wave transmission equipment is provided with speaker, intelligent network reception equipment is provided with pick up, it is characterized in that: be sequentially connected with in described sound wave transmission equipment and be provided with MIM message input module, acoustic coded module and modulation synthesis sound wave module, be sequentially connected with in intelligent network reception equipment and be provided with target sound waves extraction module, sound wave decoder module, information extraction modules and link block.
It is provided with encrypting module and verification error correction generation module between described MIM message input module and acoustic coded module, between sound wave decoder module and information extraction modules, is provided with verification correction module and deciphering module.
It is provided with transmission gain control module between described modulation synthesis sound wave module and speaker, between pick up and target sound waves extraction module, is provided with reception gain control module.
The invention has the beneficial effects as follows: noiseproof feature is stronger, and the rate of information throughput is higher and passes through to select F_total and F_select transfer rate adjustable, coded system user can be self-defined, taking starting bin can be adjustable by F_base, use in environment in difference and can select F_base thus avoiding overlapping with environmental noise frequency range, improve sound wave signal to noise ratio；
Owing to both increasing mute frame after frequency waveform each in synthetic sound wave process, the frequency hangover of speaker can be muted frame and absorb so that more serious speaker that frequency is trailed has well adapting to property, and distinct device speaker adaptability is high；
Do not need normalized, it is not necessary to fixed threshold value extracts decoded information, and the method being used in F_total frequency band F_select frequency band maximum of extraction, than method for normalizing and fixed threshold value method, there is higher noiseproof feature；
Method is simple to operate and communication device calls is low, it is adaptable to all have between pick up with loudspeaker apparatus communicate.
(4) accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Accompanying drawing 1 is the workflow diagram of the present invention；
Accompanying drawing 2 is the structured flowchart of the present invention；
(5) detailed description of the invention
Accompanying drawing is a kind of specific embodiment of the present invention.This embodiment comprises the steps: 1, inputs data waiting for transmission: data waiting for transmission can be arbitrary data, can be simple information, can also be with the addition of verification error correction information or add the data of confidential information, the data of data length information can also be the increase in, ordinary circumstance is the increase in the data of start information and ending message, it is also possible to be WiFi acquisition, 2 D code information, character recognition, be manually entered, the data of phonetic entry.2, the kind of data symbol determines frequency range total quantity F_total as required, extracts number of frequency bands F_select, for instance, the kind if desired transmitting data has 256 kinds, and F_total can select 11, F_select can select 4；F_total determine coding required take frequency range total quantity, F_select determines that each data symbol needs the number of frequency bands taken；Modulating frequency F_base is then frequency starting position, frequency interval F_distance is the interval of each frequency range: such as, select F_base=10000Hz, F_distance=200Hz, F_total=11, then sonic transmissions needs the frequency band range taken to be 10000Hz-12000Hz, uses frequency range 10000Hz, 10200Hz, 10400Hz, 10600Hz, 10800Hz, 11000Hz, 11200Hz, 11400Hz, 11600Hz, 11800Hz, 12000Hz to transmit data.3, make code book according to F_total and F_select, data symbol is mapped to code word corresponding in code book；Such as F_total=11, F_select=4, then can make the code book of 11bit length, and each data symbol needs 4 bit to represent, bit position 1 is effectively or 0 effectively；Such as, if bit position 1 is effectively, then first data symbol can be expressed as 00000001111, and second data is expressed as 00000010111, the like, until all data symbols are mapped completely to code word；Data symbol is mapped to the code word of correspondence.4, according to incoming code word, synthesis sound wave: for example with such as F_total=11, F_select=4, bit position 1 is effective, code table low level correspondence F_base=10000Hz, then the frequency range of 00000001111 correspondence is 10000Hz, 10200Hz, 10400Hz, 10600Hz, then generate frequency waveform by sinusoidal or cosine generating function, length is frame_length, then add smoothing windows to process, generate one section of mute signal and add after frequency waveform, for instance additional length is frame_length/2 mute signal；Generating all synthesis sound waves in chronological order, normal conditions also can add the mute signal of certain time length before or after whole synthetic waveform.5, the sound wave of synthesis is play by device speaker.6, the sound wave play is obtained by equipment pick up.7, extracted the sound wave in the target frequency bands set by Goertzel algorithm, including and be not limited to frequency-domain transform method or time-domain filtering method and extract；Extracting target sound waves selects sliding window to press frame extraction, frame length is typically chosen requirement and is less than frame_length, the front N frame obtaining pickup sound wave first is used for estimating that sonic transmissions takies the background noise of frequency range, N+1 frame starts to extract target sound waves, by F_select frequency range that certain method choice energy is maximum in the frequency range of the F_total quantity started in F_base frequency range, this system of selection can be the mode of gain or decay, and is not limited to this.8, F_select the frequency range by selecting carries out binary map, such as, in the effective situation in bit position 1, selecting F_select frequency range is 10000Hz, 10200Hz, 10400Hz, 10600Hz, then binary map is 00000001111, it is certain code word in code book, data symbol can be decoded further by the mapping relations between code word and data symbol.9, the data symbol by decoding carries out data cube computation, obtains continuous print serial data.
nullAdopt the short range data transmission method based on sound wave and the device of the present invention，The SSID of target WiFi and Password Input are sent the MIM message input module of equipment to sound wave，By encrypting module, SSID and password are encrypted，Even if making undelegated user obtain the information encrypted，Still the content of information cannot be obtained，This module ensures that user transmits Information Security，And add verification error correction information by verifying error correction generation module，Then data are unit input acoustic coded module by Byte，And acoustic coded module output 11bit information，Modulation synthesis sound wave module encodes information by 11bit and carries out sound wave synthesis，Frequency synthesis is 15000Hz、15200Hz、15400Hz、15600Hz、15800Hz、16000Hz、16200Hz、16400Hz、16600Hz、16800Hz、17000Hz.Send gain control module and send gain by the involutory one-tenth sound wave adjustment of demand, by speaker, sound wave is sent.
Intelligent network receives the pick up of equipment and receives acoustic signals, receive the gain of acoustic signals by demand adjustment by receiving gain control module, target sound waves extraction module extracts the target sound waves signal of 11bit by frequency domain filtering method or time-domain filtering method, target sound waves signal is decoded the data being reduced in units of Byte by sound wave decoder module, decoded data is verified error correction according to the verification error correction method of agreement in advance by verification correction module, if verification is not passed through, abandon, the data that verification is passed through enter deciphering module and are decoded, information extraction modules extracts SSID and the encrypted message of target WiFi, link block is by extracting SSID and password linking objective WiFi.
For guaranteeing the confidentiality of sonic transmissions, can suitably reduce the gain sending gain control module, increase the gain receiving gain control module, sound wave can also be reduced simultaneously and send device speaker and the air line distance of intelligent network reception equipment pick up, guarantee that can obtain sound wave, long-distance transmissions and object stop in certain little scope can cause that acoustic wave energy is significantly decayed and cannot be obtained.
For avoiding acoustic signals to be interfered and distortion, cause that verification correction module verification error correction failure abandons data, SSID and the encrypted message of multipass target WiFi can be sent, make sound wave send device speaker simultaneously and intelligent network receives equipment pick up and keeps rational air line distance.
Adopt the short range data transmission method based on sound wave and the device of the present invention, it is possible to solve the WiFi allocation problem in intelligent network camera initialization procedure.Smart machine certification connectivity problem in Smart Home field can be solved, all smart machines need to access intelligent household control terminal, intelligent household control terminal is for WiFi access, network terminal SSID and password only need to be synthesized sound wave by user, and play by speaker, all smart machines receiving information of acoustic wave just can parse network terminal SSID and password, and then certification connects intelligent household control terminal.Owing to body of wall can stop sound wave, it can be ensured that neighbour's's equipment will not be interfered.
A series of detailed description listed by the present invention; it is only illustrating of the feasibility embodiment to the present invention; and be not used to limit the scope of the invention; when without departing substantially from present invention spirit or basic feature; in other specific forms, equivalent way, change mode realize the present invention, should be included within protection scope of the present invention.
The mode of present invention embodiment describes, but it is not that each embodiment only comprises an independent technical scheme, also should description being made as a whole, the technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that.
In addition, embodiment of the present invention flow chart and/or block diagram describe, computer program instructions flowchart and/or block diagram, except method, system (device) or computer program can be provided, may also provide computer program instructions in computer Embedded Processor or other programmable data processing device so that it is produce the function in flow chart and/or block diagram.
Claims (10)
1., based on a short range data transmission method for sound wave, it is characterized in that: comprise the following steps:
(1), data waiting for transmission are inputted；
(2), the kind of data symbol is determined frequency range total quantity F_total and extracts number of frequency bands F_select as required；
(3), make code book according to the frequency range total quantity F_total determined and extraction number of frequency bands F_select, data symbol is mapped to code word corresponding in code book；
(4), according to incoming code word, sound wave is synthesized；
(5) sound wave of synthesis, is play；
(6) sound wave play, is obtained；
(7) in the sound wave obtained, extract the sound wave in target frequency bands；
(8), the sound wave of extraction is mapped, decode data symbol by the mapping relations between code word and data symbol；
(9), carry out data cube computation by the data symbol decoded, obtain continuous print serial data.
2. the short range data transmission method based on sound wave according to claim 1, is characterized in that: in step (1), and data waiting for transmission are added with and add confidential information.
3. the short range data transmission method based on sound wave according to claim 1, is characterized in that: in step (1), and data waiting for transmission are added with verification error correction information.
4. the short range data transmission method based on sound wave according to claim 1, is characterized in that: in step (2), the kind of data symbol determines modulating frequency F_base and frequency interval F_distance as required.
5. the short range data transmission method based on sound wave according to claim 1, is characterized in that: in step (4), adds smoothing windows and process after generating frequency waveform by sinusoidal or cosine generating function.
6. the short range data transmission method based on sound wave according to claim 1, is characterized in that: in step (4), adds mute signal before or after whole synthetic waveform.
7. the short range data transmission method based on sound wave according to claim 1, is characterized in that: in step (7) a metallic, extracts target sound waves and selects sliding window to press frame extraction, and frame length is less than every section of sound wave duration.
8. the device being used for realizing the short range data transmission method based on sound wave described in claim 1, send equipment including sound wave and intelligent network receives equipment, sound wave transmission equipment is provided with speaker, intelligent network reception equipment is provided with pick up, it is characterized in that: be sequentially connected with in described sound wave transmission equipment and be provided with MIM message input module, acoustic coded module and modulation synthesis sound wave module, be sequentially connected with in intelligent network reception equipment and be provided with target sound waves extraction module, sound wave decoder module, information extraction modules and link block.
9. the short range data transmission device based on sound wave according to claim 8, it is characterized in that: be provided with encrypting module and verification error correction generation module between described MIM message input module and acoustic coded module, between sound wave decoder module and information extraction modules, be provided with verification correction module and deciphering module.
10. the short range data transmission device based on sound wave according to claim 8, it is characterized in that: be provided with transmission gain control module between described modulation synthesis sound wave module and speaker, between pick up and target sound waves extraction module, be provided with reception gain control module.
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