CN105790854B - A kind of short range data transmission method and device based on sound wave - Google Patents
A kind of short range data transmission method and device based on sound wave Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
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Abstract
The short range data transmission method and device based on sound wave that the present invention relates to a kind of.This method includes the following steps：Input data to be transmitted；The type of data symbol as needed determines frequency range total quantity and extracts number of frequency bands；Code book is made, data symbol is mapped to corresponding code word in code book；According to incoming code word, sound wave is synthesized；Play the sound wave of synthesis；Obtain the sound wave played；The sound wave in target frequency bands is extracted in the sound wave of acquisition；The sound wave of extraction is mapped, decodes data symbol by the mapping relations between code word and data symbol；Data connection is carried out by the data symbol decoded, obtains continuous serial data.The beneficial effects of the invention are as follows：The quality data transmission for realizing the equipment room with sound pick-up and loudspeaker, there is stronger noiseproof feature, has very strong adaptability to distinct device microphone characteristics and loudspeaker performance, easy to operate, low to communication device calls.
Description
（One）Technical field
The invention belongs to wireless communication technology field, in particular to a kind of short range data transmission method based on sound wave and
Device.
（Two）Background technique
Cable-network transmission method, such as twisted pair, coaxial cable, optical fiber transmit reliable and high speed.But with equipment
To miniaturization and mobile development, greater advantage is then embodied by wireless transmission information, such as in wireless network camera, intelligence
Energy 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. require application specific hardware modules
Support, the higher cost in terms of transmitting low volume data, and every kind of communication mode all existing defects：For example, WiFi mode is necessary
There is a hot spot device, and in interactive process, nearby larger range can be with intercepted data packet for hot spot, and there are security risks；
The direct-connected mode of WiFi needs equipment to monopolize WiFi, disconnects original WiFi link, and user experience is very poor；Bluetooth mode then needs
To pass through manual search, connection confirmation, the sequence of operations such as matching connection, user's operation is too multiple in low volume data transmission process
It is miscellaneous.
In order to supplement the deficiency of wire transmission method and traditional radio transmitting method, occur a kind of utilizing sonic transmissions
The method of data, but current sonic transmissions method also has following defect：Frequency of sound wave is fixed, generally auditory perceptual less than
Supersonic band or infrasound frequency range；There are severe frequency leakage, the non-targeted sound wave frequency ranges of severe jamming for sound wave modulation intelligence
Frequency；Acoustic coded has apparent initial position and end position, is unfavorable for information protection；The loudspeaker performance at distinct device end
Difference causes loudspeaker to send sound wave there are different degrees of distortion and hangover, and existing sonic transmissions scheme does not solve to raise
Sound device characteristic compatibling problem.
Application No. is a kind of 201110277536.4, entitled " high reliability data transmission based on multifrequency sound wave
The application for a patent for invention of method and device " discloses a kind of sonic transmissions method, and this method uses different frequency by frequency filtering
Value come demarcate number 0 to 9, used the different bandwidths between 15kHz to 22kHz, contained not within each data packet period
The waveform of same frequency, after the data of transmission reach receiving end, the waveform for the different frequency being reduced is used to indicate different numbers.
Although this method reduces the error rate of data convert, still, the rate of data transmission is relatively fixed, and transmission data use 2
The definition of one of system, 4 systems, 8 systems, 10 systems or 16 system modes, data transmission are not flexible.
Application No. is 201210058106.8, entitled " data communication method based on audio or ultrasonic wave and it is
The application for a patent for invention of system " discloses a kind of sonic transmissions method, and this method is by repeating to send data packet, superposition and except making an uproar
Data convert accuracy can be improved to a certain extent, but the invention requires to repeat transmission times N as positive integer and N is greater than 1, this
Also cause message transmission rate lower；And the invention needs normalized in parsing data procedures, passes through threshold value solution
Data are precipitated, the selection of threshold value directly affects parsing data correctness, is difficult to find out under distinct device, different noise circumstances
One optimum threshold value.
In addition, the consistency that the loudspeaker transmitting capacity of distinct device and microphone receive ability is different, for example, different wheats
Gram wind has dramatically different, the frequency response of different loudspeakers to the reception response sensitivity and reproducibility of different frequency sounds
There is also apparent difference, there may be " frequency hangover " phenomenons for certain loudspeakers.Therefore, above method is it is difficult to ensure that transmitting terminal
The accuracy of the accuracy that issued to the acoustic signals of different frequency and receiving end to signals revivification.
（Three）Summary of the invention
The short range data transmission method that in order to compensate for the shortcomings of the prior art, the present invention provides a kind of based on sound wave and
Device realizes the quality data transmission of the equipment room with sound pick-up and loudspeaker, has stronger noiseproof feature, to difference
Equipment microphone characteristics and loudspeaker performance have very strong adaptability, easy to operate, low to communication device calls.
The present invention is achieved through the following technical solutions：
A kind of short range data transmission method based on sound wave, it is characterized in that：Include the following steps：
（1）, input data to be transmitted；
（2）, data symbol as needed type determine frequency range total quantity F_total and extract number of frequency bands F_
select；
（3）, according to determining frequency range total quantity F_total and extract number of frequency bands F_select and make code book, by data
Symbol is mapped to corresponding code word in code book；
（4）, according to incoming code word, synthesize sound wave；
（5）, play synthesis sound wave；
（6）, obtain play sound wave；
（7）, in the sound wave of acquisition extract target frequency bands in sound wave；
（8）, the sound wave of extraction mapped, decode data symbols by the mapping relations between code word and data symbol
Number；
（9）, data connection carried out by the data symbol that decodes, obtain continuous serial data.
Preferably, in step（1）In, data to be transmitted are added with encryption information.
Preferably, in step（1）In, data to be transmitted are added with verification error correction information.
Preferably, in step（2）In, the type of data symbol as needed determines modulating frequency F_base and frequency
It is spaced F_distance.
Preferably, in step（4）In, add smoothing windows processing after generating frequency waveform by sinusoidal or cosine generating function.
Preferably, in step（4）In, mute signal is added before or after entire synthetic waveform.
Preferably, in step（7）In, it extracts target sound waves selection sliding window and is extracted by frame, when frame length is less than every section of sound wave
It is long.
A kind of device for realizing the short range data transmission method based on sound wave, including sound wave sending device and intelligence
Network sink devices, sound wave sending device are equipped with loudspeaker, and intelligent network receiving device is equipped with sound pick-up, it is characterized in that：
It is sequentially connected in the sound wave sending device equipped with MIM message input module, acoustic coded module and modulation synthesis sound wave module, intelligence
It can be sequentially connected in network sink devices equipped with target sound waves extraction module, sound wave decoder module, information extraction modules and connection
Module.
Encrypting module and verification error correction generation module, sound wave are equipped between the MIM message input module and acoustic coded module
Verification correction module and deciphering module are equipped between decoder module and information extraction modules.
It is equipped between the modulation synthesis sound wave module and loudspeaker and sends gain control module, sound pick-up and target sound waves
Reception gain control module is equipped between extraction module.
The beneficial effects of the invention are as follows：Noiseproof feature is stronger, and the rate of information throughput is higher and passes through selection F_total
Adjustable with F_select transmission rate, coding mode user can be customized, and occupying starting bin can be adjustable by F_base,
F_base be can choose in different use environments to avoid being overlapped with environmental noise frequency range, improve sound wave signal-to-noise ratio；
Due to both increasing mute frame after frequency waveform each during synthesizing sound wave, the frequency hangover of loudspeaker can quilt
Mute frame absorbs, so that trailing more serious loudspeaker with well adapting to property, to distinct device loudspeaker adaptability to frequency
It is high；
Normalized is not needed, fixed door limit value is not needed and extracts decoded information, and is used in F_total frequency band
The middle method for extracting F_select frequency band maximum value has higher noise immunity than method for normalizing and fixed door limit value method
Energy；
Method is easy to operate and low to communication device calls, has leading between sound pick-up and loudspeaker apparatus suitable for all
Letter.
（Four）Detailed description of the invention
The present invention will be further described below with reference to the drawings.
Attached drawing 1 is work flow diagram of the invention；
Attached drawing 2 is structural block diagram of the invention；
（Five）Specific embodiment
Attached drawing is a kind of specific embodiment of the invention.The embodiment includes the following steps：1, data to be transmitted are inputted：
Data to be transmitted can be arbitrary data, can be simple information, be also possible to be added to verification error correction information or encryption letter
The data of breath are also possible to increase the data of data length information, and ordinary circumstance is to increase start information and ending message
Data, be also possible to WiFi acquisition, two-dimensional barcode information, character recognition, be manually entered, voice input data.2, according to need
It wants the type of data symbol to determine frequency range total quantity F_total, number of frequency bands F_select is extracted, for example, if desired passing
The type of transmission of data has 256 kinds, and F_total, which can choose 11, F_select, can choose 4；F_total is determined needed for coding
The occupancy frequency range total quantity wanted, F_select determine the number of frequency bands that each data symbol needs to occupy；Modulating frequency F_base
It is then frequency starting position, frequency interval F_distance is the interval of each frequency range：For example, selection F_base=10000Hz,
F_distance=200Hz, F_total=11, then the frequency range that sonic transmissions need to occupy is 10000Hz-12000Hz, is made
With frequency range 10000Hz, 10200Hz, 10400Hz, 10600Hz, 10800Hz, 11000Hz, 11200Hz, 11400Hz,
11600Hz, 11800Hz, 12000Hz transmit data.3, code book is made according to F_total and F_select, data symbol is reflected
It is mapped to corresponding code word in code book；Such as F_total=11, F_select=4 can then make the code book of 11bit length, each
Data symbol needs 4 bit to indicate, the position bit 1 is effectively or 0 is effective；For example, if the position bit 1 is effective, first data
Symbol can be expressed as 00000001111, and second data is expressed as 00000010111, and so on, until all data symbols
Number it is mapped completely to code word；Data symbol is mapped to corresponding code word.4, according to incoming code word, sound wave is synthesized：Such as it adopts
With such as F_total=11, effectively, code table low level corresponds to F_base=10000Hz, then for the position F_select=4, bit 1
00000001111 corresponding frequency range is 10000Hz, 10200Hz, 10400Hz, 10600Hz, then generates letter by sinusoidal or cosine
Number generates frequency waveform, and length frame_length, then plus smoothing windows are handled, and it is additional in frequency to generate one section of mute signal
After waveform, such as additional length is frame_length/2 mute signal；All synthesis sound waves, usual feelings are generated in chronological order
Condition can also add the mute signal of certain time length before or after entire synthetic waveform.5, the sound of synthesis is played by device speaker
Wave.6, the sound wave played is obtained by equipment sound pick-up.7, the sound in the target frequency bands of setting is extracted by Goertzel algorithm
Wave, including and it is not limited to frequency-domain transform method or time-domain filtering method extraction；Target sound waves selection sliding window is extracted to extract by frame,
Frame length is typically chosen requirement and is less than frame_length, and the preceding N frame for obtaining pickup sound wave for the first time is used to estimate that sonic transmissions account for
With the ambient noise of frequency range, N+1 frame starts to extract target sound waves, in the frequency range for the F_total quantity that F_base frequency range starts
In by the maximum F_select frequency range of certain method choice energy, which can be the mode of gain or decaying,
And it is without being limited thereto.8, it is carried out under binary map, such as the effective situation in the position bit 1 by F_select frequency range of selection, selection
F_select frequency range is 10000Hz, 10200Hz, 10400Hz, 10600Hz, then binary map is 00000001111, i.e.,
For some code word in code book, data symbol can be further decoded by the mapping relations between code word and data symbol.
9, data connection is carried out by the data symbol decoded, obtains continuous serial data.
Using the short range data transmission method and device of the invention based on sound wave, by the SSID and password of target WiFi
It is input to the MIM message input module of sound wave sending device, SSID and password are encrypted by encrypting module, so that unauthorized
Even if the information that has been encrypted of user, still can not obtain the content of information, this module guarantees that user transmits information peace
Quan Xing, and verification error correction information is added by verification error correction generation module, then data are that unit inputs sound wave volume by Byte
Code module, and acoustic coded module exports 11bit information, modulation synthesis sound wave module carries out sound wave conjunction by 11bit encoded information
At, frequency synthesis 15000Hz, 15200Hz, 15400Hz, 15600Hz, 15800Hz, 16000Hz, 16200Hz, 16400Hz,
16600Hz,16800Hz,17000Hz.It sends gain control module and gain is sent to synthesis sound wave adjustment on demand, pass through loudspeaking
Device sends sound wave.
The sound pick-up of intelligent network receiving device receives acoustic signals, is adjusted on demand by reception gain control module
The gain of acoustic signals is received, target sound waves extraction module extracts 11bit's by frequency domain filtering method or time-domain filtering method
Target sound waves signal, sound wave decoder module are decoded the data being reduced to as unit of Byte to target sound waves signal, verification
Correction module verifies error correction to decoded data according to the verification error correction method arranged in advance, abandons if verification does not pass through, school
Test by data enter deciphering module and be decoded, information extraction modules extract the SSID and encrypted message of target WiFi, even
Connection module is by extracting SSID and password linking objective WiFi.
It for the confidentiality for ensuring sonic transmissions, can suitably reduce the gain for sending gain control module, increase and receive increasing
The gain of beneficial control module, while the sky of sound wave sending device loudspeaker and intelligent network receiving device sound pick-up can also be reduced
Between linear distance, it is ensured that in certain available sound wave of a small range, remote transmission and object blocking will lead to sound wave energy
Amount substantially decays and can not obtain.
To avoid acoustic signals from being interfered and be distorted, cause to verify correction module verification error correction failure and abandon data,
The SSID and encrypted message of transmittable multipass target WiFi, while making sound wave sending device loudspeaker and intelligent network receiving device
Sound pick-up keeps reasonable air line distance.
Using the short range data transmission method and device of the invention based on sound wave, intelligent network camera can solve
WiFi allocation problem in initialization procedure.It can solve smart machine in smart home field and authenticate connectivity problem, Suo Youzhi
Energy equipment needs to access intelligent household control terminal, and for intelligent household control terminal by taking WiFi is accessed as an example, user only need to be by network
Terminal SSID and password synthesize sound wave, and are played by loudspeaker, and all smart machines for receiving information of acoustic wave can parse
Network terminal SSID and password out, then certification connects intelligent household control terminal.It, can be true since wall can stop sound wave
Protecting neighbour's's equipment will not be interfered.
A series of detailed description listed by the present invention, only specifically to feasible embodiment of the invention
Protection scope that is bright, being not intended to limit the invention, without departing substantially from spirit of that invention or essential characteristic, with others
Concrete form, equivalent way, change mode realize the present invention, should all be included in the protection scope of the present invention.
The present invention describes by way of example, but be not each embodiment only includes an independent technical side
Case should also consider the specification as a whole, and the technical solutions in the various embodiments may also be suitably combined, form this field
The other embodiments that technical staff is understood that.
In addition, the embodiment of the present invention is described with flowchart and/or the block diagram, computer program instructions implementation process
Figure and/or block diagram, in addition to can provide method, system（Device）Or outside computer program product, computer program can also be provided
It instructs in computer Embedded Processor or other programmable data processing devices, it is made to generate flow chart and/or box
Function in figure.
Claims (6)
1. a kind of short range data transmission method based on sound wave, it is characterized in that：Include the following steps：
（1）, input data to be transmitted；
（2）, data symbol as needed type determine frequency range total quantity F_total and extract number of frequency bands F_
Select determines modulating frequency F_base and frequency interval F_distance；
（3）, according to determining frequency range total quantity F_total and extract number of frequency bands F_select and make code book, F_total is determined
Frequency range total quantity is occupied required for coding, F_select determines the number of frequency bands that each data symbol needs to occupy；Modulation
Frequency F_base is then frequency starting position, and frequency interval F_distance is the interval of each frequency range, and data symbol is used
Binary map corresponding code word into code book；
（4）, according to incoming code word, synthesize sound wave：Add smoothing windows after generating frequency waveform by sinusoidal or cosine generating function
Processing, adds mute signal before or after entire synthetic waveform；
（5）, play synthesis sound wave；
（6）, obtain play sound wave；
（7）, in the sound wave of acquisition extract target frequency bands in sound wave；
（8）, the sound wave of extraction mapped, decode data symbol by the mapping relations between code word and data symbol；
（9）, data connection carried out by the data symbol that decodes, obtain continuous serial data；
Device used in it, including sound wave sending device and intelligent network receiving device, sound wave sending device are equipped with loudspeaker,
Intelligent network receiving device is equipped with sound pick-up, is sequentially connected in sound wave sending device equipped with MIM message input module, acoustic coded
Module and modulation synthesize sound wave module, are sequentially connected in intelligent network receiving device equipped with target sound waves extraction module, sound wave solution
Code module, information extraction modules and link block.
2. the short range data transmission method according to claim 1 based on sound wave, it is characterized in that：In step（1）In, to
The data of transmission are added with encryption information.
3. the short range data transmission method according to claim 1 based on sound wave, it is characterized in that：In step（1）In, to
The data of transmission are added with verification error correction information.
4. the short range data transmission method according to claim 1 based on sound wave, it is characterized in that：In step（7）In, it mentions
Target sound waves selection sliding window is taken to extract by frame, frame length is less than every section of sound wave duration.
5. the short range data transmission method according to claim 1 based on sound wave, it is characterized in that：The information input mould
Encrypting module and verification error correction generation module, sound wave decoder module and information extraction modules are equipped between block and acoustic coded module
Between be equipped with verification correction module and deciphering module.
6. the short range data transmission method according to claim 1 based on sound wave, it is characterized in that：The modulation synthetic sound
It is equipped between wave module and loudspeaker and sends gain control module, be equipped between sound pick-up and target sound waves extraction module and receive increasing
Beneficial control module.
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