CN107395291A - A kind of low-frequency sound wave communication means for penetrating telephone system and its system - Google Patents
A kind of low-frequency sound wave communication means for penetrating telephone system and its system Download PDFInfo
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Abstract
The invention discloses a kind of low-frequency sound wave communication means for penetrating telephone system, including transmitting terminal, channel of acoustic wave and receiving terminal, this method to comprise the following steps：S1：Using 16 system shift keying modulation technologies, from frequency of sound wave of 16 frequency intervals more than 70 is chosen between 1100Hz 3400Hz frequency of sound wave as acoustic signals, each acoustic signals duration is more than or equal to 20ms, a 4bit data are represented respectively, scope is 0000~1111, and 16 acoustic signals are encoded one by one, the coding is encoded using 16 systems, original 16 scale coding is obtained, 16 acoustic signals is then made and is stored into the original 16 scale coding table of comparisons in database；Then played by loudspeaker and send acoustic drive signals, receiving terminal first reconciles into corresponding acoustic signals after receiving acoustic drive signals and then is transmitted communication again.The present invention can be used for telephone system, and sound attenuating low for equipment requirements is relatively weak, and propagation distance is slightly remote, and Consumer's Experience is good.
Description
Technical field
The present invention relates to acoustic communication field, and in particular to a kind of low-frequency sound wave communication means for penetrating telephone system and
Its system.
Background technology
Communication, refer to the information interchange and transmission carried out between person to person or man and nature by certain behavior or medium.Sound
Ripple is a kind of mechanical wave, is the mode of propagation of sound, is a kind of communication mode with the most use in mankind's daily life.Sound wave by
Short in its propagation distance, speed is slow, is seldom applied, let us say that, except the mankind in the wireless communication field of long range
Speech exchange outside, sound wave is in ignored stage in wireless communication field.
With the rise of mobile payment, the new means of payment based on various near-field communication technologies begins to appear in people's
The visual field, such as radio frequency cCredit card payment, NFC is paid, and ultrasonic wave is paid, and bluetooth is paid etc., under this near field communication environment, by sound wave
It is possibly realized as a kind of data communication mode.
Ultrasonic wave currently used in the market is paid and other sound waves pay product, be all using high band sound wave (>
Communication 5kHz) is realized, is inevitably present following problem：
It can not be used in existing telephone system.Telephone system sample rate is 8kHz, theoretical boundary 4kHz, sound wave
Frequency will produce slight or moderate distortion between 3.4kHz-4kHz, serious distortion will occur more than 4kHz, according to international telecommunication
Alliance's related specifications, it is desirable to which sound signal frequencies to be transmitted have to be lower than 3.4kHz, and distortion otherwise will occur.Although existing be based on
High band acoustic communication technology can use on other intelligent sound communication equipments, but in telephone system, it is tight due to existing
Distortion again, telephone system are the transmission obstacles that it can not go beyond, and significantly limit its use range.
It is higher to equipment requirement.Due to using high band sound wave (not including supersonic band), it is desirable to which audible device is necessary
High frequency sound wave can be sent, it is desirable to which receiving device must be able to receive identification high frequency sound wave, or even need to carry out transformation and upgrade to equipment
It could use.It is higher to equipment requirement, it can not be used in some low side devices, limit use range.
Sound attenuating is serious, and propagation distance is short.For sound wave, frequency is higher, and propagation distance is shorter.Such as ultrasonic wave, effectively
Transmission range is less than 10cm, sends equipment during use and receiving device must be very close, additionally, due to the direction of sonic transmissions
Property, the loudspeaker that equipment is sent during use must be close to and the microphone of face receiving device, and direction is slightly offset from may all lead
Cause communication failure.
The existing high frequency sound wave communication technology typically uses amplitude modulation or phasing technique, and frequency is dull sharp, and human ear experience is poor, holds
User's auditory fatigue and tinnitus are easily caused, influences Consumer's Experience.
Therefore need further to improve existing acoustic communication.
The content of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, there is provided it is a kind of can be practical in telephone system,
Low for equipment requirements, the low-frequency sound wave communication means that communication efficiency is good and Consumer's Experience is good.
It is a further object of the present invention to provide it is a kind of can in telephone system it is practical, it is low for equipment requirements, communication effect
The low-frequency sound wave communication system that fruit is good and Consumer's Experience is good.
To reach above-mentioned purpose, what the present invention was realized in：A kind of low-frequency sound wave communication party for penetrating telephone system
Method, including transmitting terminal, channel of acoustic wave and receiving terminal, this method comprise the following steps：
S1：Using 16 system shift keying modulation technologies, from 16 frequencies of selection between 1100Hz-3400Hz frequency of sound wave
Frequency of sound wave of the rate interval more than 70 is more than or equal to 20ms as acoustic signals, each acoustic signals duration, this 16
The acoustic signals of different frequency correspond to 16 binary digits that a unique length is 4bit, the 16 binary digits scope respectively
For 0000~1111, and make the acoustic signals of different frequency and 16 binary digits table of comparisons A are stored into database；
S2：The transmitting terminal prepares initial data to be sent after receiving transmission instruction, then utilizes AES and letter
Road encryption algorithm carries out computing to sent initial data, obtains data to be sent；
Obtained data to be sent are grouped, are one group per 4bit, since low level, less than 4bit in packet count
0 is mended according to a high position；
S3：With reference to the table of comparisons A in S1, transmitting terminal processor by the 4bit data being divided into group in S2 one by one with it is described right
According to the data comparison in Table A, the data to be sent of the packet are converted into the acoustic drive signals of respective frequencies therewith successively
Output, each acoustic drive signals duration is more than or equal to 20ms, and in this step, data to be sent are by mono- group of 4bit's
Serial data is converted to a string of acoustic drive signals strings by different frequency, and acoustic drive signals are electric signal；
S4：Transmitting terminal sound play device is after the acoustic drive signals that the processor sends over are received, by sound
Ripple drive signal is converted to acoustic signals and played back；In this process, transmitting terminal sound play device completes electroacoustic conversion, will
Electric signal is converted to acoustic signals；
S5：The acoustic signals that the sound play device plays back are propagated through the sound wave channel；
S6：The receiving terminal microphone receives the acoustic signals to come through sound wave transmission, and acoustic signals are changed
For corresponding analog or digital signal, the signal after changing is electric signal；
S7：Analog or digital signal after conversion is amplified receiving terminal processor and filtering process, finally restores
The acoustic signals that transmitting terminal is sent out；
S8：The acoustic signals restored are reduced into one group of 4bit data successively according to table of comparisons A, and will obtain
The data of 4bit length are spliced successively, obtain receiving data；
S9：The reception data that S8 is obtained carry out channel decoding, decryption and error detection computing, so as to obtain transmitting terminal transmission
Initial data, sign off.
Preferably, described to send instruction from user to transmitting terminal input, the input of instruction passes through button or icon triggers
Input.
Preferably, signal modulation step includes in the S1 steps：Using 16 system shift keying modulation technologies, from
The sound wave conduct for the different frequency that 16 frequency intervals are 70Hz~120Hz is chosen between 1500Hz-3400HZ audio frequency
Acoustic signals, each acoustic signals duration are 20ms.
Preferably, the sound play device is loudspeaker or buzzer；The transmitting terminal is mobile phone, flat board, computer
Or audio card；The receiving terminal is mobile phone, flat board, computer or audio card.
Preferably, the sound wave channel in the S5 is air, fixed or liquid transmissive medium.
A kind of low-frequency sound wave communication system for penetrating telephone system, including transmitting terminal, channel of acoustic wave and receiving terminal, this is
System also includes with lower module：
Database preparation module：Using 16 system shift keying modulation technologies, from 1100Hz-3400Hz frequency of sound wave it
Between choose the frequency of sound wave of 16 frequency intervals more than 70 and be more than or equal to as acoustic signals, each acoustic signals duration
20ms, acoustic signals 16 binary digits that a corresponding unique length is 4bit respectively of this 16 different frequencies, described 16
Binary digits scope is 0000~1111, and the acoustic signals of different frequency and 16 binary digits table of comparisons A storages are made to counting
According in storehouse；
Receive command module：The transmitting terminal prepares initial data to be sent after receiving transmission instruction, then utilizes and adds
Close algorithm and channel coding algorithm carry out computing to sent initial data, obtain data to be sent；
Data preparation module：Obtained data to be sent are grouped, are one group per 4bit, since low level, deficiency
4bit's mends 0 in a grouped data high position；
Signal modulation module：With reference to the table of comparisons A of database preparation module, data are prepared mould by transmitting terminal processor
The 4bit data being divided into group in block one by one with the data comparison in the table of comparisons A, by the data to be sent of the packet according to
The secondary acoustic drive signals output for being converted to respective frequencies therewith, each acoustic drive signals duration are more than or equal to
20ms, in this step, data to be sent are converted to a string of sound waves by different frequency by mono- group of 4bit serial data and drive letter
Number string, acoustic drive signals are electric signal；
Signal conversion module：Transmitting terminal sound play device drives letter receiving the sound wave that the processor sends over
After number, acoustic drive signals are converted into acoustic signals and played back, in this process, transmitting terminal sound play device completes electricity
Sound is changed, and converts electrical signals to acoustic signals；
Acoustic signals propagation module：The acoustic signals that the sound play device plays back are carried out through the sound wave channel
Propagate；
Acoustic information receives modular converter：The receiving terminal microphone receives the sound wave letter to come through sound wave transmission
Number, and acoustic signals are converted into corresponding analog or digital signal, the signal after changing is electric signal；
Signal demodulation module：Analog or digital signal after conversion is amplified receiving terminal processor and filtering process,
Finally restore the acoustic signals that transmitting terminal is sent out；
The acoustic signals restored are reduced successively according to the acoustic signals of different frequency with the 16 binary digits tables of comparisons
Spliced successively into one group of 4bit data, and by the data of obtained 4bit length, obtain receiving data；
Signal recombination module：Modulate signals into the reception data obtained in module and carry out channel decoding, decryption and error detection fortune
Calculate, so as to obtain the initial data of transmitting terminal transmission, sign off.
Preferably, described to send instruction from user to transmitting terminal input, the input of instruction passes through button or icon triggers
Input.
Preferably, the middle database preparation module includes：Using 16 system shift keying modulation technologies, from 1500Hz-
The sound wave of 16 frequency interval 70Hz~120Hz different frequency is chosen between 3400HZ audio frequency as acoustic signals,
Each acoustic signals duration is 20ms.
Preferably, the sound play device is loudspeaker or buzzer；The transmitting terminal is mobile phone, flat board, computer
Or audio card；The receiving terminal is mobile phone, flat board, computer or audio card.
Preferably, the sound wave channel in the acoustic signals propagation module is air, fixed or liquid transmissive medium.
The beneficial effects of the invention are as follows：
1st, telephone system can be broken through and use obstacle, used in telephone system or other speech ciphering equipments：The application sound wave
Signal frequency range, less than 3.4kHz, meets International Telecommunication Union's related specifications, uses this hair between 1.1kHz-3.2kHz
Bright acoustic signals can smoothly pass through telephone system and complete communication.
2nd, it is low for equipment requirements, it is strong without scrap build, compatibility：Will to equipment compared to the existing high frequency sound wave communication technology
Ask high, or even need upgrading or reforming equipment, the present invention is either high-end or low because the sound wave frequency used is less than 3.4kHz
The voice communication apparatus at end can all complete the transmission and reception of sound wave, and user uses existing equipment, without entering again to equipment
Row transformation and upgrade, low for equipment requirements, compatibility is strong, and it is small to promote cost.
3rd, sound attenuating is relatively weak, and propagation distance is slightly remote：Sound attenuating is suitable with people's acoustic attenuation, compared to existing high frequency sound
Communication techniques 10cm or so effective propagation path, intelligent terminal effective propagation path of the present invention are extended to 2-3 rice or so,
Non-directional requirement, without intelligent terminal is close together, under conditions of secure communication is ensured, user's use is more square
Just, application scenarios are greatly expanded.
5th, Consumer's Experience is good：The existing high frequency sound wave communication technology typically uses amplitude modulation or phasing technique, and frequency is dull sharp,
Similar noise, human ear experience is poor, easily causes user's auditory fatigue, influences Consumer's Experience, and the present invention is approached due to frequency of sound wave
People's acoustic frequency, human ear are easily accepted by, while have the switching of 16 different frequency sound waves, similar music, and Consumer's Experience is good.
Brief description of the drawings
Fig. 1 is a kind of low-frequency sound wave communication means flow chart of steps for penetrating telephone system of the present invention.
Fig. 2 is signal transmission and the shift process of a kind of low-frequency sound wave communication system for penetrating telephone system of the present invention
Figure.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of low-frequency sound wave communication means for penetrating telephone system, including transmitting terminal, channel of acoustic wave and
Receiving terminal, the sound play device are loudspeaker or buzzer；The transmitting terminal is mobile phone, flat board, computer or audio
Card；The receiving terminal is mobile phone, flat board, computer or audio card, and this method comprises the following steps：
S1：Using 16 system shift keying modulation technologies, from 16 frequencies of selection between 1100Hz-3400Hz frequency of sound wave
Frequency of sound wave of the rate interval more than 70 is more than or equal to 20ms as acoustic signals, each acoustic signals duration, this 16
The acoustic signals of different frequency correspond to 16 binary digits that a unique length is 4bit, these 16 binary digits scopes respectively
For 0000~1111, and make the acoustic signals of different frequency and 16 binary digits table of comparisons A are stored into database, to sound
16 binary digits of the coding of ripple signal are arbitrary, as long as can correspond.
Preferably, using 16 system shift keying modulation technologies, 16 are chosen between 1500Hz-3400HZ audio frequency
Individual frequency interval be 70-120Hz audio frequency be used as acoustic signals, each acoustic signals duration for more than or equal to
20ms。
In the present embodiment, using 16 system shift keying modulation technologies, selected between 1500Hz-3400HZ audio frequency
Taking the audio frequency that 16 frequency intervals are 100Hz, each acoustic signals duration is 20ms as acoustic signals.
S2：The transmitting terminal prepares initial data to be sent after receiving transmission instruction, then utilizes AES and letter
Road encryption algorithm carries out computing to sent initial data, obtains data to be sent；
Obtained data to be sent are grouped, are one group per 4bit, since low level, less than 4bit in packet count
0 is mended according to a high position；
S3：With reference to the table of comparisons A in S1, transmitting terminal processor by the data being divided into group in S2 one by one with table of comparisons A
This 4bit data comparison, the sound wave that the data to be sent of the packet are converted to corresponding different frequency successively drive letter
Number output, each acoustic drive signals duration is more than or equal to 20ms, and in this step, data to be sent are by mono- group of 4bit
Serial data be converted to a string of acoustic drive signals strings by different frequency, i.e., be converted to electric signal by acoustic drive signals；
S4：Transmitting terminal sound play device is after the acoustic drive signals that the processor sends over are received, by sound
Ripple drive signal is converted to acoustic signals and played back, and in this process, transmitting terminal sound play device completes electroacoustic conversion, will
Electric signal is converted to acoustic signals；
S5：The acoustic signals that the sound play device plays back are propagated through the sound wave channel；
S6：The receiving terminal microphone receives the acoustic signals to come through sound wave transmission, and acoustic signals are changed
For corresponding analog or digital signal, the signal after changing is electric signal；
S7：Analog or digital signal after conversion is amplified receiving terminal processor and a series of places such as filtering process
Reason, finally restores the acoustic signals that transmitting terminal is sent out；
S8：The acoustic signals restored are reduced into one group of 4bit data successively according to table of comparisons A, and will obtain
The data of 4bit length are spliced successively, and obtained serial data is referred to as receiving data,；
S9：The reception data that S8 is obtained carry out channel decoding, the computing such as decryption and error detection, are sent so as to obtain transmitting terminal
Initial data, sign off.
As shown in Fig. 2 the signal transmission of the present invention and transfer process are：Different frequency is can't come round to the idea in beginning-selection 16
16 acoustic signals of acoustic signals-make are saved in database-original data processing-with original 16 binary digits table of comparisons A
Acoustic drive signals-the acoustic signals for becoming data-data packet-to be sent and table of comparisons A corresponding conversions into respective frequencies are adjusted
System-corresponding acoustic signals；
Acoustic signals obtained above carry out propagating-being converted into the processing such as analog or digital signal-amplification filtering-sound wave letter
Number reduction-acoustic signals demodulate-is reduced into data to be sent-computing is decrypted in decoding-and obtains original transmission data-end.
From the audio that 16 frequency intervals of selection are 100Hz between 1500Hz-3400HZ audio frequency in the present embodiment
For frequency as acoustic signals, the technical principle and reason that each acoustic signals duration is 20ms are as follows：
The voice frequency range of people is：Man：80Hz-900Hz, female：80Hz-1100Hz, it is overlapping with people's acoustic frequency to avoid,
Interference is produced to acoustic communication.Interference is produced to acoustic communication to reduce voice to greatest extent, this patent is used for the sound wave to communicate
Voice frequency range is avoided in frequency selection, i.e., more than 1100Hz.
Telephone system requires that sound signal frequencies have to be lower than 3400Hz.Because phone system signal sample rate is 8k, reason
By can above transmit the acoustic signals that highest frequency is 4000Hz, for the consideration of the acoustic signals quality to transmission, international telecommunication
Alliance requires the frequency of sound wave of telephone system in below 3400Hz.Therefore the communication frequency of sound wave that this patent uses is less than
3400Hz.It is simultaneously guarantee signal transmission quality, the highest sound wave frequency that the frequency of sound wave that this patent uses requires with telecommunication union
Rate retains certain interval nargin.
For communication, the train of signal of a string of quantity fixations, the information content that individual signals carry is bigger, and communication efficiency is got over
Height, the information content of carrying are also bigger.For frequency shift keying (FSK) signal modulation mode, respectively from several specific frequencies
Signal, each signal carry 2 information.Such as 2 system FSK, 0 and 1 are represented respectively from the signal of 2 different frequencies, then each
Signal carries 2 information, and it 0 is exactly 1 not to be.For another example 4 system FSK, 00,01,10 are represented respectively from 4 different frequency signals,
11, then each signal carry 4 information.Ideally, the information letter that is The more the better, but taking simultaneously that individual signals represent
Number resource is also more.For the FSK of 1 1000 system, it is meant that need to take 1000 signal frequencies, while different frequencies
Certain frequency interval is required between rate signal, otherwise can produce severe jamming, if requiring each signal frequency interval
1000Hz, that is intended to take 1,000,000 signal frequencies, and this is very big waste for signal resource.Therefore it is single
The information that signal carries can not possibly infinitely increase.
For acoustic communication, because sound wave is easily done in transmitting procedure because of modulation error, transmission frequency deviation, noise
The factor such as disturb and producing frequency change causes to identify mistake, therefore it is required that acoustic signals frequency interval at least 70Hz, logical to ensure
Believe quality, signal frequency is at intervals of 100Hz in this patent.Between 1100Hz-3400Hz, it can only at most select 24 and conform to
The different frequency asked.In view of needing to avoid people's acoustic frequency while leaving enough interval nargin, with voice frequency interval
400Hz, the peak frequency interval 200Hz with telephone system requirement, therefore can only choose to 18 different frequencies, while for convenience
Data processing (18 frequency representatives, 18 information, it is necessary to 5bit, 5bit can represent 32 information, and actual only with 18, data
Processing is inconvenient), take 16 different frequencies (16 frequency representatives, 16 information, i.e. 4bit, 4bit can represent 16 information), base
In above-mentioned reason, therefore choose the acoustic signals of 16 frequencies of upper table.Certainly, also other can be chosen between 1100Hz-3400Hz
The acoustic signals of any 16 different frequencies, other case study on implementation are combined into using different coded systems.
The signal frequency that this patent uses belongs to low-frequency range, and the signal waveform cycle is longer, such as the 1600Hz signal waveform cycles
For 0.625ms, the 3100Hz signal waveform cycles are 0.323ms, thus need in the receive process of sound wave to establish stable state when
Between longer (acoustic signals that rigid connection receives have fluctuation, and stable acoustic signals are needed when identifying), generally require 3 signal weeks
Phase, when having a noise jamming, it is necessary to time it is longer.While in order to guarantee normal identification signal frequency, it is necessary to ensure adjacent letter
Number zero-crossing rate at least differ 4 times, that is, differ 2 signal periods, (each 2 zero-crossing rates of cycle).Such as 1600Hz and 1700Hz
Signal, at least need 20ms duration to can be only achieved 4 zero-crossing rates of difference, i.e. (1600Hz signals week 2 signal periods
Issue is that 32,1700Hz signal periods number is 34), to consider efficiency of transmission, and the single group letter of 4bit information is represented in this patent
Number duration uses 20ms.
Table 1 is the acoustic signals and 16 binary digits table of comparisons A of the different frequency of one of case study on implementation, is corresponded in table
Relation is as shown in the table：
Table 1
In addition, the generation principle of acoustic signals：Processor is according to signal frequency, within a corresponding signal period, only
Corresponding output port need to be set to high level and each half period of low level respectively, you can realize output single-frequency Digital Square-Wave
Signal.Such as 2000Hz acoustic signals, signal period 500us, corresponding output port is first set to low level, continued
250us, then output port is set to high level, continue 250us, that is, obtain the digital square-wave that frequency is 2000Hz, this letter
When number (electric signal) is transferred to buzzer, digital square-wave is converted to the sound wave that frequency is identical frequency by buzzer automatically to be believed
Number.
A kind of low-frequency sound wave communication system for penetrating telephone system, including transmitting terminal, channel of acoustic wave and receiving terminal, this is
System also includes with lower module：
Database preparation module：Using 16 system shift keying modulation technologies, from 1100Hz-3400Hz frequency of sound wave it
Between choose the frequency of sound wave of 16 frequency intervals more than 70 and be more than or equal to as acoustic signals, each acoustic signals duration
20ms, the acoustic signals of this 16 different frequencies correspond to 16 binary digits that a unique length is 4bit respectively, and these 16
Binary digits scope is 0000~1111, and the acoustic signals of different frequency and the storage of the 16 binary digits tables of comparisons are made to counting
According in storehouse；
Receive command module：The transmitting terminal prepares initial data to be sent after receiving transmission instruction, then utilizes and adds
Close algorithm and channel coding algorithm carry out computing to sent initial data, obtain data to be sent；
Data preparation module：Obtained data to be sent are grouped, are one group per 4bit, since low level, deficiency
4bit's mends 0 in a grouped data high position；
Signal modulation module：Compareed with reference to the acoustic signals of the different frequency in database preparation module with 16 binary digits
Table, transmitting terminal processor is by the 4bit data being divided into group in data preparation module acoustic signals with the different frequency one by one
With 16 binary digits table of comparisons data comparisons, the data to be sent of the packet are converted into the sound wave of respective frequencies therewith successively
Drive signal exports, and each acoustic drive signals duration is more than or equal to 20ms, in this step, data to be sent by
The serial data that mono- group of 4bit is converted to a string of acoustic drive signals strings by different frequency, and acoustic drive signals are electric signal；
Signal conversion module：Transmitting terminal sound play device drives letter receiving the sound wave that the processor sends over
After number, acoustic drive signals are converted into acoustic signals and played back, in this process, transmitting terminal sound play device completes electricity
Sound is changed, and converts electrical signals to acoustic signals；
Acoustic signals propagation module：The acoustic signals that the sound play device plays back are carried out through the sound wave channel
Propagate；
Acoustic information receives modular converter：The receiving terminal microphone receives the sound wave letter to come through sound wave transmission
Number, and acoustic signals are converted into corresponding analog or digital signal, the signal after changing is electric signal；
Signal demodulation module：Analog or digital signal after conversion is amplified receiving terminal processor and filtering process etc.
A series of processing, finally restore the acoustic signals that transmitting terminal is sent out；
The acoustic signals restored are reduced into one group of 4bit data successively according to frequency of sound wave and the data table of comparisons,
And spliced the data of obtained 4bit length successively, obtained serial data is referred to as receiving data；
Signal recombination module：The reception data that S8 is obtained carry out the computing such as channel decoding, decryption HE error detections, so as to obtain
The initial data that transmitting terminal is sent, sign off.
Wherein, the transmission instruction is inputted from user to transmitting terminal, and the input of instruction is defeated by button or icon triggering
Enter.
The middle database preparation module includes：Using 16 system shift keying modulation technologies, from 1500Hz-3400HZ's
The sound wave of 16 frequency interval 70Hz~120Hz different frequency is chosen between audio frequency as acoustic signals, each sound wave
Signal duration is 20ms.
The sound play device is loudspeaker or buzzer；The transmitting terminal is mobile phone, flat board, computer or audio
Card；The receiving terminal is mobile phone, flat board, computer or audio card.
Sound wave channel in the acoustic signals propagation module is air, fixed or liquid transmissive medium.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and changed.Therefore, the invention is not limited in embodiment disclosed and described above, to the one of invention
A little modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although used in this specification
Some specific terms, but these terms are merely for convenience of description, do not form any restrictions to the present invention.
Claims (10)
1. a kind of low-frequency sound wave communication means for penetrating telephone system, including transmitting terminal, channel of acoustic wave and receiving terminal, its feature
It is, this method comprises the following steps：
S1：Using 16 system shift keying modulation technologies, between 16 frequencies of selection between 1100Hz-3400Hz frequency of sound wave
It is more than or equal to 20ms as acoustic signals, each acoustic signals duration every the frequency of sound wave more than 70, this 16 differences
The acoustic signals of frequency correspond to 16 binary digits that a unique length is 4bit respectively, and the 16 binary digits scope is
0000~1111, and make different frequency acoustic signals and 16 binary digits table of comparisons A store into database；
S2：The transmitting terminal prepares initial data to be sent after receiving transmission instruction, then utilizes AES and channel to compile
Code algorithm carries out computing to sent initial data, obtains data to be sent；
Obtained data to be sent are grouped, are one group per 4bit, since low level, less than 4bit in grouped data height
Mend 0 in position；
S3：With reference to the table of comparisons A in S1, transmitting terminal processor by the 4bit data being divided into group in S2 one by one with the table of comparisons
Data comparison in A, the acoustic drive signals that the data to be sent of the packet are converted to respective frequencies therewith successively export,
Each acoustic drive signals duration is more than or equal to 20ms；
S4：Transmitting terminal sound play device drives sound wave after the acoustic drive signals that the processor sends over are received
Dynamic signal is converted to acoustic signals and played back；
S5：The acoustic signals that the sound play device plays back are propagated through the sound wave channel；
S6：The receiving terminal microphone receives the acoustic signals to come through sound wave transmission, and acoustic signals are converted to pair
The analog or digital signal answered, the signal after changing is electric signal；
S7：Analog or digital signal after conversion is amplified receiving terminal processor and filtering process, finally restores transmission
Hold the acoustic signals sent out；
S8：The acoustic signals restored are reduced into one group of 4bit data, and the 4bit that will be obtained successively according to table of comparisons A
The data of length are spliced successively, obtain receiving data；
S9：The reception data that S8 is obtained carry out channel decoding, decryption and error detection computing, so as to obtain the original of transmitting terminal transmission
Data, sign off.
A kind of 2. low-frequency sound wave communication means for penetrating telephone system as claimed in claim 1, it is characterised in that the hair
Instruction is sent to be inputted from user to transmitting terminal, the input of instruction passes through button or icon triggering input.
A kind of 3. low-frequency sound wave communication means for penetrating telephone system as claimed in claim 1, it is characterised in that the S1
Signal modulation step includes in step：Using 16 system shift keying modulation technologies, from 1500Hz-3400HZ audio frequency it
Between choose the sound wave of the different frequency that 16 frequency intervals are 70Hz~120Hz and continue as acoustic signals, each acoustic signals
Time is 20ms.
A kind of 4. low-frequency sound wave communication means for penetrating telephone system as claimed in claim 1, it is characterised in that the sound
Sound playing device is loudspeaker or buzzer；The transmitting terminal is mobile phone, flat board, computer or audio card；The receiving terminal
For mobile phone, flat board, computer or audio card.
A kind of 5. low-frequency sound wave communication means for penetrating telephone system as claimed in claim 1, it is characterised in that the S5
In sound wave channel be air, fixed or liquid transmissive medium.
6. a kind of low-frequency sound wave communication system for penetrating telephone system, including transmitting terminal, channel of acoustic wave and receiving terminal, its feature
It is, the system also includes with lower module：
Database preparation module：Using 16 system shift keying modulation technologies, selected between 1100Hz-3400Hz frequency of sound wave
Frequency of sound wave of 16 frequency intervals more than 70 is taken to be more than or equal to as acoustic signals, each acoustic signals duration
20ms, acoustic signals 16 binary digits that a corresponding unique length is 4bit respectively of this 16 different frequencies, described 16
Binary digits scope is 0000~1111, and the acoustic signals of different frequency and 16 binary digits table of comparisons A storages are made to counting
According in storehouse；
Receive command module：The transmitting terminal prepares initial data to be sent after receiving transmission instruction, is then calculated using encryption
Method and channel coding algorithm carry out computing to sent initial data, obtain data to be sent；
Data preparation module：Obtained data to be sent are grouped, are one group per 4bit, since low level, less than 4bit
Mend 0 grouped data is high-order；
Signal modulation module：With reference to the table of comparisons A of database preparation module, transmitting terminal processor is by data preparation module
With the data comparison in the table of comparisons A, the data to be sent of the packet are turned successively one by one for the 4bit data being divided into group
The acoustic drive signals output of respective frequencies therewith is changed to, each acoustic drive signals duration is more than or equal to 20ms；
Signal conversion module：Transmitting terminal sound play device is in the acoustic drive signals for receiving the processor and sending over
Afterwards, acoustic drive signals are converted into acoustic signals and played back；
Acoustic signals propagation module：The acoustic signals that the sound play device plays back are passed through the sound wave channel
Broadcast；
Acoustic information receives modular converter：The receiving terminal microphone receives the acoustic signals to come through sound wave transmission, and
Acoustic signals are converted into corresponding analog or digital signal, the signal after changing is electric signal；
Signal demodulation module：Analog or digital signal after conversion is amplified receiving terminal processor and filtering process, finally
Restore the acoustic signals that transmitting terminal is sent out；
The acoustic signals restored are reduced into one successively according to the acoustic signals and the 16 binary digits tables of comparisons of different frequency
Group 4bit data, and the data of obtained 4bit length are spliced successively, obtain receiving data；
Signal recombination module：Modulate signals into the reception data obtained in module and carry out channel decoding, decryption and error detection computing, from
And the initial data of transmitting terminal transmission is obtained, sign off.
A kind of 7. low-frequency sound wave communication system for penetrating telephone system as claimed in claim 6, it is characterised in that the hair
Instruction is sent to be inputted from user to transmitting terminal, the input of instruction passes through button or icon triggering input.
8. a kind of low-frequency sound wave communication system for penetrating telephone system as claimed in claim 6, it is characterised in that in described
Database preparation module includes：Using 16 system shift keying modulation technologies, selected between 1500Hz-3400HZ audio frequency
The sound wave for taking 16 frequency interval 70Hz~120Hz different frequency is as acoustic signals, each acoustic signals duration
20ms。
A kind of 9. low-frequency sound wave communication system for penetrating telephone system as claimed in claim 6, it is characterised in that the sound
Sound playing device is loudspeaker or buzzer；The transmitting terminal is mobile phone, flat board, computer or audio card；The receiving terminal
For mobile phone, flat board, computer or audio card.
10. a kind of low-frequency sound wave communication system for penetrating telephone system as claimed in claim 6, it is characterised in that described
Sound wave channel in acoustic signals propagation module is air, fixed or liquid transmissive medium.
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