CN110011736A - A kind of sound wave safety communicating method and its equipment based on self-interference elimination - Google Patents
A kind of sound wave safety communicating method and its equipment based on self-interference elimination Download PDFInfo
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- CN110011736A CN110011736A CN201910229084.9A CN201910229084A CN110011736A CN 110011736 A CN110011736 A CN 110011736A CN 201910229084 A CN201910229084 A CN 201910229084A CN 110011736 A CN110011736 A CN 110011736A
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- 230000008030 elimination Effects 0.000 title description 3
- 238000003379 elimination reaction Methods 0.000 title description 3
- 238000005070 sampling Methods 0.000 description 2
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- 235000021307 Triticum Nutrition 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/10—Secret communication by using two signals transmitted simultaneously or successively
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
The invention discloses a kind of sound wave safety communicating methods eliminated based on self-interference.When transmitting terminal and receiving end establish connection, transmitting terminal sends information of acoustic wave to receiving end, receiving end carries out broadcast self-interference noise, the receiving end receives self-interference noise while receiving information of acoustic wave transmitted by transmitting terminal, self-interference noise is obtained from input information by attenuation coefficient, and subtract self-interference noise by input information and obtain information of acoustic wave, without carrying out encrypting and decrypting, operation is simple, and highly-safe, is conducive to the performance of raising system.
Description
Technical field
The present invention relates to the communications field, it is especially a kind of based on self-interference eliminate sound wave safety communicating method and its set
It is standby.
Background technique
Currently, more and more data tradition are completed by acoustic communication, such as sound wave in Alipay pair etc..In order to mention
The safety of high data, currently existing scheme generally use data key and are encrypted, but this method needs to carry out complexity
Encryption and decryption operation, significantly reduce the timeliness of communication, be unfavorable for user experience.
Summary of the invention
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide a kind of sound wave peaces eliminated based on self-interference
Full communication method and its equipment can generate interception facility in the case where not carrying out encryption and decryption to data in practical applications
Interference, prevents data to be ravesdropping.
Technical solution used by the present invention solves the problems, such as it is: in a first aspect, the present invention provides one kind based on certainly dry
Disturb the sound wave safety communicating method of elimination, comprising the following steps:
Connection is established in transmitting terminal and receiving end, and the transmitting terminal sends information of acoustic wave to receiving end, and the receiving end is external
Broadcast self-interference noise；
The receiving end obtains received input information, and the input information includes that information of acoustic wave and self-interference are made an uproar
Sound；
The receiving end removes self-interference noise, acquisition sound from the input information according to the attenuation coefficient obtained in advance
Wave information.
Further, the self-interference noise is white Gaussian noise.
Further, the information of acoustic wave is the carrier wave of 16FSK, and the frequency range of the information of acoustic wave is 15 to 19.5kHz.
Further, the power of the self-interference noise is greater than or equal to the power of the information of acoustic wave.
Further, the attenuation coefficient is obtained by following steps before the communication starts:
Chirp output signal is broadcasted in the receiving end, and obtains chirp input signal；
Fast Fourier Transform (FFT) is carried out to the chirp output signal and the chirp input signal, by acquired results
Ratio is set as attenuation coefficient.
Further, the self-interference noise in the receiving end is obtained from input information by the attenuation coefficient.
Further, from dry described in being subtracted in the information of acoustic wave of receiving end input information as acquired in the receiving end
It disturbs obtained by noise.
The one or more technical solutions provided in the embodiment of the present invention at least have the following beneficial effects: that the present invention adopts
With a kind of sound wave safety communicating method eliminated based on self-interference.When transmitting terminal and receiving end establish connection, transmitting terminal to
Receiving end sends information of acoustic wave, and receiving end carries out broadcast self-interference noise, and the receiving end is receiving sound transmitted by transmitting terminal
Self-interference noise is received while wave information, self-interference noise is obtained from input information by attenuation coefficient, and pass through input
Information subtracts self-interference noise and obtains information of acoustic wave.For compared with the prior art, the present invention is only needed without carrying out encrypting and decrypting
Self-interference information is subtracted in input information, operation is simple, and highly-safe, is conducive to the performance of raising system.
Detailed description of the invention
The invention will be further described with example with reference to the accompanying drawing.
Fig. 1 is the receiving end of the embodiment of the present invention and the catenation principle figure of transmitting terminal；
Fig. 2 is the time domain and frequency domain figure for the self-interference noise that the receiving end of the embodiment of the present invention generates；
Fig. 3 is the time domain and frequency domain figure of the chirp output signal of the embodiment of the present invention；
Fig. 4 is the time domain and frequency domain figure for the chirp input signal that the receiving end of the embodiment of the present invention receives；
Fig. 5 is the attenuation coefficient and sampling number relational graph of the receiving end of the embodiment of the present invention；
Fig. 6 is the self-interference noise time domain and frequency domain figure that the receiving end of the embodiment of the present invention receives；
Fig. 7 is the self-interference noise schematic diagram that the receiving end of the embodiment of the present invention is estimated to receive by attenuation coefficient；
Fig. 8 is that the self-interference noise that the receiving end of the embodiment of the present invention receives subtracts the difference after the self-interference noise of estimation
Value.
Specific embodiment
Currently, more and more data tradition are completed by acoustic communication, such as sound wave in Alipay pair etc..In order to mention
The safety of high data, currently existing scheme generally use data key and are encrypted, but this method needs to carry out complexity
Encryption and decryption operation, significantly reduce the timeliness of communication, be unfavorable for user experience.
Based on this, present invention employs a kind of sound wave safety communicating methods eliminated based on self-interference.In transmitting terminal and connect
When receiving end establishes connection, transmitting terminal sends information of acoustic wave to receiving end, and receiving end carries out broadcast self-interference noise, the receiving end
Self-interference noise is received while receiving information of acoustic wave transmitted by transmitting terminal, is obtained from input information by attenuation coefficient
Self-interference noise, and self-interference noise is subtracted by input information and obtains information of acoustic wave.For compared with the prior art, the present invention
Without carrying out encrypting and decrypting, it is only necessary to subtract self-interference information in input information, operation is simple, and highly-safe, is conducive to
The performance of raising system.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
It should be noted that each feature in the embodiment of the present invention can be combined with each other, in this hair if do not conflicted
Within bright protection scope.In addition, though having carried out functional module division in schematic device, shows patrol in flow charts
Sequence is collected, but in some cases, it can be shown in the sequence execution in the module division being different from device or flow chart
The step of out or describing.
Referring to Fig.1, the embodiment provides a kind of sound wave safety communicating methods eliminated based on self-interference, including
Following steps:
Connection is established in transmitting terminal and receiving end, and the transmitting terminal sends information of acoustic wave to receiving end, and the receiving end is external
Broadcast self-interference noise；
The receiving end obtains received input information, and the input information includes that information of acoustic wave and self-interference are made an uproar
Sound；
The receiving end removes self-interference noise, acquisition sound from the input information according to the attenuation coefficient obtained in advance
Wave information.
Wherein, in the present embodiment, the receiving end and transmitting terminal are preferably smart machine, and include loudspeaker and wheat
Gram wind, for broadcasting and receiving information.
Wherein, in the present embodiment, the receiving end is by the speaker announcement self-interference noise, certainly due to receiving end
Body can be realized removal self-interference noise, and for interception facility, received input information has merged information of acoustic wave
And self-interference noise, due to not in the attenuation coefficient for knowing self-interference noise, can not full filter self-interference noise, nothing
Method reconciles out useful information of acoustic wave from 0dB signal-to-noise ratio below, and receiving end can calculate self-interference according to attenuation coefficient
Noise, to realize safe communication.
With reference to Fig. 2, further, in another embodiment of the present invention, the self-interference noise is white Gaussian noise.
Wherein, the self-interference noise can be any form of noise, preferred white Gaussian noise in the present embodiment, due to
White Gaussian noise is easier to calculate in situation known to attenuation coefficient, and power bracket is greater than information of acoustic wave, is more advantageous to really
Protect the safety of communication.
Wherein, in the present embodiment, since the presence of man made noise makes listener-in's signal-to-noise ratio be reduced to 0dB hereinafter, from
And useful information of acoustic wave can not be obtained.Man made noise of the invention is the white Gaussian noise that receiving device oneself generates, and
Only to known to receiving end.The band logical white Gaussian noise of covering communication frequency is generated, as shown in Figure 2.
Further, in another embodiment of the present invention, the information of acoustic wave is the carrier wave of 16FSK, the sound wave letter
The frequency range of breath is 15 to 19.5kHz.
Wherein, in the present embodiment, the information of acoustic wave can be single carrier or multicarrier, pass through digital modulation technique
Obtain, the carrier wave of preferred 16FSK in the present embodiment, the frequency range of information of acoustic wave is 15 to 19.5kHz, be more advantageous into
The calculating of row white Gaussian noise.
Further, in another embodiment of the present invention, the power of the self-interference noise is greater than or equal to the sound
The power of wave information.
Wherein, the self-interference noise can be any power, and the power of preferably self-interference noise is greater than in the present embodiment
The power of information of acoustic wave, it can be ensured that realize that self-interference noise carries out all standing to information of acoustic wave, improve safety.
With reference to Fig. 3-Fig. 5, further, in another embodiment of the present invention, the attenuation coefficient is before the communication starts
It is obtained by following steps:
Chirp output signal is broadcasted in the receiving end, and obtains chirp input signal；
Fast Fourier Transform (FFT) is carried out to the chirp output signal and the chirp input signal, by acquired results
Ratio is set as attenuation coefficient.
Wherein, attenuation coefficient can obtain at any time, preferably obtain before communicating in the present embodiment, can accelerate be
The computational efficiency of system.
Wherein, in the present embodiment, before each communication, chirp output signal, institute are sent using the loudspeaker of receiving end
The chirp output signal of transmission is received by the microphone of receiving end, forms self-interference, and receiving end receives chirp input signal, is led to
The ratio crossed after calculating the two Fast Fourier Transform (FFT) obtains the attenuation coefficient at current time.Since self-interference channel is receiving end
The internal loopback of equipment communicates, and can be approximately considered channel is metastable during short.
For example, chirp output signal x (t) frequency in the present embodiment is 15.5kHz-19.5kHz, points are N in range
=8192, chirp input signal acquired in receiving end is y (t), carries out Fast Fourier Transform (FFT) to x (t) and y (t) respectively, obtains
Result X and Y out, then attenuation coefficient H=| X |/| Y |；Wherein, the relationship of x (t) and X and power as shown in figure 3, y (t) and Y with
The relationship of power is as shown in figure 4, the relationship of H and sampling number is as shown in Figure 5.
Further, in another embodiment of the present invention, the self-interference noise in the receiving end passes through the decaying
Coefficient is estimated from input information and is obtained.
Wherein, in the present embodiment, the input information received due to receiving end is the information of acoustic wave and Gauss of transmitting terminal
White noise, it is desirable to which demodulation show that information of acoustic wave must first remove white Gaussian noise, and the white Gaussian sound received is as shown in Figure 6；?
In the present embodiment, after obtaining the frequency selective attenuation coefficient between 15k-19.5kHz, white Gaussian noise is estimated,
If the white Gaussian noise generated is w (t), the white Gaussian noise of estimation is w^ (t), Wn(ejw) it is that the white Gaussian noise generated carries out
N point is removed after Fast Fourier Transform (FFT), estimates principle as shown in fig. 7, being obtained by the following formula:
With reference to Fig. 8, further, in another embodiment of the present invention, the information of acoustic wave of the receiving end is connect by described
It is subtracted in input information acquired in receiving end obtained by the self-interference noise.
If setting input information that receiving end receives as z (t), self-interference eliminate after signal are as follows: z^ (t)=z (t)-w
^(t).The result obtained is as shown in Figure 8.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to above-mentioned embodiment party above
Formula, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (7)
1. a kind of sound wave safety communicating method eliminated based on self-interference, which comprises the following steps:
Connection is established in transmitting terminal and receiving end, and the transmitting terminal sends information of acoustic wave, the receiving end overseas broadcast to receiving end
Self-interference noise；
The receiving end obtains input information, and the input information includes the information of acoustic wave and the reception that the transmitting terminal is sent
Hold the self-interference noise of broadcast；
The receiving end removes self-interference noise according to the attenuation coefficient obtained in advance from the input information, obtains sound wave letter
Breath.
2. a kind of sound wave safety communicating method eliminated based on self-interference according to claim 1, it is characterised in that: described
Self-interference noise is white Gaussian noise.
3. a kind of sound wave safety communicating method eliminated based on self-interference according to claim 1, it is characterised in that: described
Information of acoustic wave is the carrier wave of 16FSK, and the frequency range of the information of acoustic wave is 15 to 19.5kHz.
4. a kind of sound wave safety communicating method eliminated based on self-interference according to claim 1, it is characterised in that: described
The power of self-interference noise is greater than or equal to the power of the information of acoustic wave.
5. a kind of sound wave safety communicating method eliminated based on self-interference according to claim 1, which is characterized in that described
Attenuation coefficient is obtained by following steps before the communication starts:
Chirp output signal is broadcasted in the receiving end, and obtains chirp input signal；
Fast Fourier Transform (FFT) is carried out to the chirp output signal and the chirp input signal, by the ratio of acquired results
It is set as attenuation coefficient.
6. a kind of sound wave safety communicating method eliminated based on self-interference according to claim 1, it is characterised in that: described
Self-interference noise in receiving end is obtained from input information by the attenuation coefficient.
7. a kind of sound wave safety communicating method eliminated based on self-interference according to claim 6, it is characterised in that: described
The information of acoustic wave of receiving end is subtracted in the input information as acquired in the receiving end obtained by the self-interference noise.
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| CN2019102067333 | 2019-03-19 | ||
| CN201910206733 | 2019-03-19 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201301788A (en) * | 2011-06-20 | 2013-01-01 | Arbl Co Ltd | Ultrasonic remote control device |
| CN103618575A (en) * | 2013-12-11 | 2014-03-05 | 厦门大学 | Automatic real-time frame synchronization method of frequency-modulated hydro-acoustic communication system |
| CN103903368A (en) * | 2014-04-10 | 2014-07-02 | 福建联迪商用设备有限公司 | POS terminal equipment and sound wave payment system and method |
| CN104297112A (en) * | 2014-11-05 | 2015-01-21 | 上海理工大学 | Measuring method and measuring device for liquid drop particles in wet-steam region |
| US20150117157A1 (en) * | 2013-10-31 | 2015-04-30 | King Abdullah University Of Science And Technology | Integrated passive and wireless sensor |
| CN106877941A (en) * | 2015-12-10 | 2017-06-20 | 中国科学院声学研究所 | A kind of acoustic communication countermeasure set and method |
| CN109302239A (en) * | 2018-06-19 | 2019-02-01 | 长沙世邦通信技术有限公司 | A kind of short distance sound wave communication method of antinoise and distortion |
-
2019
- 2019-03-25 CN CN201910229084.9A patent/CN110011736A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201301788A (en) * | 2011-06-20 | 2013-01-01 | Arbl Co Ltd | Ultrasonic remote control device |
| US20150117157A1 (en) * | 2013-10-31 | 2015-04-30 | King Abdullah University Of Science And Technology | Integrated passive and wireless sensor |
| CN103618575A (en) * | 2013-12-11 | 2014-03-05 | 厦门大学 | Automatic real-time frame synchronization method of frequency-modulated hydro-acoustic communication system |
| CN103903368A (en) * | 2014-04-10 | 2014-07-02 | 福建联迪商用设备有限公司 | POS terminal equipment and sound wave payment system and method |
| CN104297112A (en) * | 2014-11-05 | 2015-01-21 | 上海理工大学 | Measuring method and measuring device for liquid drop particles in wet-steam region |
| CN106877941A (en) * | 2015-12-10 | 2017-06-20 | 中国科学院声学研究所 | A kind of acoustic communication countermeasure set and method |
| CN109302239A (en) * | 2018-06-19 | 2019-02-01 | 长沙世邦通信技术有限公司 | A kind of short distance sound wave communication method of antinoise and distortion |
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