CN106713611A - Mobile phone dial voice encryption system and encryption method - Google Patents
Mobile phone dial voice encryption system and encryption method Download PDFInfo
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- CN106713611A CN106713611A CN201611012747.4A CN201611012747A CN106713611A CN 106713611 A CN106713611 A CN 106713611A CN 201611012747 A CN201611012747 A CN 201611012747A CN 106713611 A CN106713611 A CN 106713611A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72448—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions
- H04M1/72454—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions according to context-related or environment-related conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
- H04K3/82—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
- H04K3/825—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection by jamming
Abstract
The invention discloses a mobile phone dial voice encryption system and encryption method, which is characterized in that the encryption method comprises the following steps: storing 12 key audios and irregular frequency audios in advance; monitoring the call voice to obtain an analog signal; judging whether a keyword exists; if so, monitoring a dial input operation to obtain operation audios; calling the 12 key audios, and judging whether the frequency of the operation audios is the same as that of the 12 key audios; if so, calling the irregular frequency audios, randomly mixing the irregular frequency audios with the operation audios to obtain mixed random audios, and finally outputting the random audios; the encryption system comprises a monitoring unit, a keyword judging unit, a storage unit, an operation audio judging unit, an audio mixing unit and a mixed audio output unit; the mobile phone dial voice encryption system and encryption method disclosed by the invention has the beneficial effects that the key audios are mixed and interfered to protect the privacy of a user; a low-frequency signal interferes the key rate of the user, so that the others are difficult to identify the key operation; and the system is intelligent, simple and convenient.
Description
Technical field
Present invention design audio encryption technical field, more particularly, to a kind of handset dialing disk of random audio mixing interference
Voice Encryption system and encryption method.
Background technology
We frequently encounter a kind of situation, i.e. client service center of mobile phone dialing bank call handle business in life.And
Dial deposit card center or credit card centre in this case, often run into such case, such as " input bank card number " " please be defeated
Enter identification card number " " trading password please be input " " asking input inquiry password " etc., we often think situation about being peeped in nobody
Under, information is exactly safe.
In fact, in the phone, each of which of numeral 0~9 is transmitted with two different single audio frequencies, used 8
Individual frequency is divided into two groups of high frequency band and low-frequency band, and low frequency carries four frequencies:679Hz, 770Hz, 852Hz and 941Hz；High frequency band
Also there are four frequencies：1209Hz, 1336Hz, 1477Hz and 1633Hz.Each numeral is by each frequency in high and low frequency band
Constitute, such as 1 uses two frequencies of 697Hz and 1209hz.Such 8 frequencies form 16 kinds of different two-frequency signals, telephone set
Each button audio is different.For people intentionally after button audio is distinguished, input content can be learnt completely, to
Existence information is divulged a secret risk for family.
In previously with respect to the case of audio encryption, the mobile phone with voice encryption and identification function
（CN200510027701.5）, a kind of mobile phone with voice encryption and identification function of the disclosure of the invention, including data signal
Processor, micro controller unit, base band, memory bank；After digital signal processor, micro controller unit initialization, data signal
First to the voice signal sampling of input handset, the data of acquisition send micro controller unit, micro controller unit to processor
Coded signal is obtained simultaneously, then by micro controller unit to voice signal sampled data and coded signal overlap-add procedure, micro-control
The information of device unit overlap-add procedure processed is stored in memory bank；And compare storage information with the preceding primary information stored in mobile phone,
Answer signal is sent between digital signal processor and base band and connect mobile phone, answer signal is sent if differing and is refused if identical
Mobile phone is connected absolutely.The invention is simple to operate while high safety due to the voice encryption technology on mobile phone using comparative maturity.
In addition in the GSM voice encryption systems based on OFDM in 2013（CN201320162194.6）, the utility model relates to
And a kind of GSM voice encryption systems based on OFDM, including transmitting end module and reception end module, launch end module and receiving terminal
Module is respectively arranged at transmitting terminal mobile phone and receiving terminal mobile phone；Transmitting end module include A/D modular converters, AMBE compression modules,
Encrypting module, OFDM modules, RPE-LTP compression modules and Interleaved Coded Modulation device, the practicality use OFDM module modulation transmissions
Mode is encrypted to GSM voices, realizes the voice secure communication of succinct, quick, safe, inexpensive GSM；Treatment
Postpone small, sound articulation high, strong security.
Existing patented technology is encrypted mainly for voice call above, and present invention aim to opponent in call
The audio and button operation this behavior that machine input through keyboard is produced are encrypted.
The content of the invention
When the present invention is for current mobile phone communication transacting business, there is the risk for being stolen and distinguishing in mobile phone key dialing tone,
When being intended to detect that user there may exist input through keyboard behavior, the encryption interference of irregular frequency random audio is opened, and used
The ultralow frequency interference close with user key-press speed is extraneous to obtain finger key frequency, so as to the input information for preventing user is let out
It is close.
The present invention is achieved by the following technical solutions：
Handset dialing disk Voice Encryption method, it is characterised in that comprise the following steps：
Step S1, prestores irregular frequency audio and 12 button audios；
Step S2, monitors call voice, obtains the analog signal of call voice；
Step S3, judges to whether there is keyword in the call voice；
If judged result is no, return to step S2；
If the determination result is YES, step S4 is performed；
Step S4, input operation of the monitoring users to dial obtains the operation audio that user input operation is produced；
Step S5, calls 12 button audios, judge it is described operation audio frequency whether with keypad tone any one described
The frequency of frequency is identical；
If judged result is no, return to step S4；
If the determination result is YES, step S6 is performed；
Step S6, calls the irregular frequency audio, and the irregular frequency audio is mixed at random with the operation audio,
Obtain mixed random audio；
Step S7, exports the random audio.
Further, the step S3 specifically includes following steps：
Step S301）Prestore an at least keyword speech characteristic parameter；
Step S302）The analog signal to the call voice is carried out at pre-filtering treatment, sampling processing and A/D conversion successively
Reason, obtains an at least data signal；
Step S303）The data signal is pre-processed, the short signal of at least adding window of a frame sequence is obtained；It is described pre-
Treatment includes preemphasis treatment and adding window sub-frame processing；
Step S304）The short signal is analyzed, the speech characteristic parameter of call voice is extracted；
Step S305）The contrast speech characteristic parameter and the keyword speech characteristic parameter for judging call voice；If institute
The speech characteristic parameter for stating call voice is matched with any keyword speech characteristic parameter, then be judged as YES；If the call language
The speech characteristic parameter of sound is all mismatched with each keyword speech characteristic parameter, then be judged as NO.
Further, the step S304 specifically includes following steps：
Step S3041）The frequency spectrum of the short signal is converted into the non-linear spectrum based on Mel frequency markings；
Step S3042）The non-linear spectrum is transformed on cepstrum domain.
Further, the 12 button audios for prestoring are touch-tone signal.
Further, in step S1 ~ step S6, the interference of low frequency signal is added to user's finger key-press rate；It is described
Low frequency signal frequency is one in interval [0.0,1.0）The random value of Hz.
Handset dialing disk Voice Encryption system includes monitoring unit 1, is used to monitor call voice, obtains the mould of call voice
Intend signal, and the input operation to monitoring users to dial, obtain the operation audio that user input operation is produced；
Keyword judging unit 2, is used to judge whether there is keyword in the call voice；
Memory cell 3, prestores 12 button audios and irregular frequency audio；
Operation audio judging unit 4, is used to call 12 button audios, judge the operation audio frequency whether with times
The frequency of one button audio is identical；
Audio mixing unit 5, is used to call the irregular frequency audio, by the irregular frequency audio and the operation sound
The random mixing of frequency, obtains mixed random audio；
Mixed audio output unit 6, is used to export the random audio.
Further, the keyword judging unit 2 includes：
Keyword feature parameter storage unit 201, be used to prestore an at least keyword speech characteristic parameter；
AD conversion unit 202, to the analog signal of the call voice is carried out successively pre-filtering treatment, sampling processing and
A/D conversion process, obtains an at least data signal；
Pretreatment unit 203, is used to pre-process the data signal, obtains the letter in short-term of at least adding window of a frame sequence
Number；The pretreatment unit includes preemphasis processing unit and adding window sub-frame processing unit；
Speech characteristic parameter extraction unit 204, is used to be analyzed the short signal, extracts the phonetic feature of call voice
Parameter；
Speech characteristic parameter comparison unit 205, is used to contrast the speech characteristic parameter and the key wordses of the call voice
Sound characteristic parameter；If the speech characteristic parameter of the call voice is matched with any keyword speech characteristic parameter, it is judged as
It is；If the speech characteristic parameter of the call voice is all mismatched with each keyword speech characteristic parameter, it is judged as NO.
Further, the speech characteristic parameter extraction unit 204 includes：
Frequency spectrum conversion unit 2041, is used to for the frequency spectrum of the short signal to be converted into the non-linear spectrum based on Mel frequency markings；
Frequency spectrum converting unit 2042, is used to be transformed into the non-linear spectrum on its cepstrum domain.
Further, the 12 button audios for prestoring are touch-tone signal；The default irregular sound
The random audio frequency that frequent rate is mixed with each other including two or more.
Further, the handset dialing disk Voice Encryption system also includes
Low frequency cell, is used to generate the extraneous identifying user finger key operation of low frequency signal interference.
Further, the final output frequency of the handset dialing disk Voice Encryption system is user key-press speed and low frequency
Signal frequency and frequency or difference frequency.
Compared with prior art, the beneficial effects of the invention are as follows：Various random audios are applied with frequently to mobile phone keypad tone frequency
The mixing interference of rate, even if keypad tone is trapped, due to not knowing how that decryption can not know corresponding key mapping, so as to people
Privacy and property serve protective effect；Key-press rate is disturbed with the ultra-low frequency signal of 1Hz or so, makes extraneous hardly possible
To distinguish that user key-press is operated；System intelligent, the special sound information that control unit is received according to supervising device judges whether
Memory cell is enabled, judges whether to call the random audio in memory cell to open interference according to the audio information specific for receiving,
It is simple and convenient.
Brief description of the drawings
Fig. 1 is overall structure block diagram of the invention；
Fig. 2 is the structured flowchart of keyword judging unit in the present invention；
Fig. 3 is flow chart of the invention；
Fig. 4 is the flow chart of step S3 in the present invention.
Specific embodiment
Present pre-ferred embodiments are given below in conjunction with the accompanying drawings, to describe technical scheme in detail.
Mixing of the present invention by being applied with various random audio frequencies to mobile phone keypad tone frequency is disturbed, and realizes dialling mobile phone
Dialer Voice Encryption, as shown in figure 1, handset dialing disk Voice Encryption method, the encryption method includes：
Step S1, prestores 12 button audios and irregular frequency audio；
Step S2, monitors call voice, obtains the analog signal of call voice；
Step S3, judges to whether there is keyword in the call voice；
If judged result is no, return to step S2；
If the determination result is YES, step S4 is performed；
Step S4, input operation of the monitoring users to dial obtains the operation audio that user input operation is produced；
Step S5, calls 12 button audios, judge it is described operation audio frequency whether with keypad tone any one described
The frequency of frequency is identical；
If judged result is no, return to step S4；
If the determination result is YES, step S6 is performed；
Step S6, calls the irregular frequency audio, and the irregular frequency audio is mixed at random with the operation audio,
Obtain mixed random audio；Step S7, exports the random audio.
Further, the step S3 specifically includes following steps：
Step S301）Prestore an at least keyword speech characteristic parameter；
Step S302）The analog signal to the call voice is carried out at pre-filtering treatment, sampling processing and A/D conversion successively
Reason, obtains an at least data signal；
Step S303）The data signal is pre-processed, the short signal of at least adding window of a frame sequence is obtained；It is described pre-
Treatment includes preemphasis treatment and adding window sub-frame processing；
Step S304）The short signal is analyzed, the speech characteristic parameter of call voice is extracted；
Step S305）Contrast the speech characteristic parameter and the keyword speech characteristic parameter of the call voice；If described logical
The speech characteristic parameter of language sound is matched with any keyword speech characteristic parameter, then be judged as YES；If the call voice
Speech characteristic parameter is all mismatched with each keyword speech characteristic parameter, then be judged as NO.
Further, the step S304 specifically includes following steps：
Step S3041）The frequency spectrum of the short signal is converted into the non-linear spectrum based on Mel frequency markings；
Step S3042）The non-linear spectrum is transformed on cepstrum domain.
Further, the 12 button audios for prestoring are touch-tone signal.
Further, the random audio frequency that the default irregular audio frequency is mixed with each other including two or more.
Further, in step S1 ~ step S6, the interference of low frequency signal is added to user's finger key-press rate.
Further, the low frequency signal frequency is one interval [0.0,1.0）The random value of Hz.
A kind of handset dialing disk Voice Encryption system, it is characterised in that it includes
Monitoring unit, is used to monitor call voice, obtains the analog signal of call voice；To monitoring users to the defeated of dial
Enter operation, obtain the operation audio that user input operation is produced；
Keyword judging unit, is used to judge whether there is keyword in the call voice；
Memory cell, prestores 12 button audios and irregular frequency audio；
Operation audio judging unit, be used to call 12 button audios, judge it is described operation audio frequency whether with times
The frequency of one button audio is identical；
Audio mixing unit, is used to call the irregular frequency audio, by the irregular frequency audio and the operation sound
The random mixing of frequency, obtains mixed random audio；
Mixed audio output unit, is used to export the random audio.
Further, the keyword judging unit includes
Keyword feature parameter storage unit, be used to prestore an at least keyword speech characteristic parameter；
AD conversion unit, pre-filtering treatment, sampling processing and A/D are carried out to the analog signal successively to the call voice
Conversion process, obtains an at least data signal；
Pretreatment unit, is used to pre-process the data signal, obtains the short signal of at least adding window of a frame sequence；
The pretreatment unit includes preemphasis processing unit and adding window sub-frame processing unit；
Speech characteristic parameter extraction unit, is used to be analyzed the short signal, extracts the phonetic feature ginseng of call voice
Number；
Speech characteristic parameter comparison unit, the speech characteristic parameter for being used to contrast the call voice is special with the keyword voice
Levy parameter；If the speech characteristic parameter of the call voice is matched with any keyword speech characteristic parameter, it is judged as YES；If
The speech characteristic parameter of the call voice is all mismatched with each keyword speech characteristic parameter, then be judged as NO.
Further, the speech characteristic parameter extraction unit includes
Frequency spectrum conversion unit, is used to for the frequency spectrum of the short signal to be converted into the non-linear spectrum based on Mel frequency markings；
Frequency spectrum converting unit, is used to be transformed into the non-linear spectrum on its cepstrum domain.
Further, the 12 button audios for prestoring are touch-tone signal.
In the phone, each of which of numeral 0~9 is transmitted with two different single audio frequencies, 8 frequencies used
It is divided into two groups of high frequency band and low-frequency band, low frequency carries four frequencies:679Hz, 770Hz, 852Hz, and 941Hz；High frequency band also has
Four frequencies：1209Hz, 1336Hz, 1477Hz and 1633Hz.Each numeral is by each frequency structure in high and low frequency band
Into such as 1 uses two frequencies of 697Hz and 1209Hz.Such 8 frequencies form 16 kinds of different two-frequency signals.
Further, the random audio frequency that the default irregular audio frequency is mixed with each other including two or more.
Further, the handset dialing disk Voice Encryption system also includes
Low frequency cell, is used to generate the extraneous identifying user finger key operation of low frequency signal interference.
Further, the final output frequency of the handset dialing disk Voice Encryption system is user key-press speed and low frequency
Signal frequency and frequency or difference frequency.
Embodiment
The sound of mobile phone key is dual-tone multifrequency (DualToneMulti Frequency, DTMF) signal, a string of phone numbers
The numeral of repetition is likely to occur in code, its frequency spectrum is so resulted in and is overlapped, or be that different numerals is also possible to contain
There is identical frequency component, if so whole string keypad sounds are brought into analysis, being possible to analyze the phone number come like that
Code is not complete, or even basic just analysis does not reach its corresponding electric ring number code.So traditional analysis mobile phone key sound dual-tone multifrequency
Method is the sound for intercepting and storing each button in advance, and then the keypad tone that each is received is analyzed respectively again, is looked for
Go out its corresponding dial key.
Therefore hinder the keypad tone maximally effective practice of analysis is that the keypad tone that each is received is carried out at interference respectively
Reason so that the external world cannot obtain corresponding dial key.
Specific implementation step is as follows:
Step S1, prestores 12 button audios and irregular frequency audio；
Step S2, monitors call voice, obtains the analog signal of call voice；
Step S3, judges to whether there is keyword in the call voice；
Step S301）Prestore " please be input into " this keyword speech characteristic parameter；
Step S302）The analog signal to the call voice is carried out at pre-filtering treatment, sampling processing and A/D conversion successively
Reason, obtains data signal；
Step S303）Preemphasis treatment and adding window sub-frame processing are carried out to the data signal, adding for an at least frame sequence is obtained
The short signal of window；
Step S304）Short signal after treatment is analyzed, the speech characteristic parameter of keyword " please be input into " is found；
Step S305）Contrast the speech characteristic parameter and the keyword speech characteristic parameter of the call voice；The call
The speech characteristic parameter of voice is matched with the speech characteristic parameter of " please be input into ", is judged as YES, and performs step S4；
Step S4, monitoring unit continues to receive the audio-frequency information that mobile phone sends, and now user presses 4 number keys, that is, generate low frequency and be
770Hz, high frequency is the double-audio signal of 1209Hz,
Control unit now calls 12 mobile phone key audios in data storage cell, audio-frequency information that mobile phone sends and 12 by
Key sound frequency is common to be input into DCU data control unit；
Step S5, DCU data control unit persistently to audio-frequency information and 12 keypad tone frequency ratios pair, judges audio frequency and 12 successively
Whether the low-and high-frequency of individual button audio coincide,
Judged result is coincide with the audio of button 4 of storage, jumps to step S6,
Step S6, built-in random audio frequency when memory cell is opened, it is assumed that the audio is 2 groups of circulations of fixed frequency signal
Combination, intercycle is Ns, and frequency is respectively 300Hz and 600Hz, and data cell calls irregular audio in memory cell frequently
Rate, the irregular audio frequency is mixed with S5 steps by the audio frequency verified,
The irregular audio frequency is used in mixed way for 2 kinds of different frequencies, finally gives new random audio,
Mixing preferably take and frequency or difference frequency mode, such as 4 number keys for 770Hz and 1209Hz double-audio signal, by with
Frequency is converted to the double-audio signal that cycle Ns, 1070Hz/1509Hz and 1370Hz/1809Hz replace change,
After completing mixed once, then retract to step S4, user does not carry out input operation for a period of time, and monitoring unit have received
External noise, control unit calls 12 mobile phone key audios in memory cell, audio-frequency information that mobile phone key sends and 12
Button audio is input into control unit jointly；
Step S5, control unit continues to audio-frequency information and 12 keypad tone frequency ratios pair, judges that audio frequency is pressed with 12 successively
Whether the low-and high-frequency of key sound frequency coincide,
Because the audio being input into is noise, it is not inconsistent with 12 pairs of double-audio signals being previously stored, authentication failed, retracts to step S5
Start to rejudge,
Data decryptor unit continues to receive second input of audio-frequency information user completion that mobile phone sends, and presses 8 number keys, generates
Low frequency 852Hz, the double-audio signal of high frequency 1336Hz,
DCU data control unit now calls 12 mobile phone key audios in data storage cell, the audio-frequency information and 12 that mobile phone sends
Individual button audio is input into DCU data control unit jointly；
DCU data control unit judges audio frequency and 12 keypad tones successively persistently to audio-frequency information and 12 keypad tone frequency ratios pair
Whether the low-and high-frequency of frequency coincide,
Judged result is coincide with the audio of button 4 of storage, jumps to step S6,
Step S6, control unit calls the irregular audio frequency in memory cell, the irregular audio frequency and S5 steps
In by verify audio frequency mixed,
The irregular audio frequency is that 2 kinds and above different random audio frequency are used in mixed way, and finally gives new random sound
Frequently,
Mixing preferably take with frequency mode, 8 number keys for 852Hz and 1336Hz double-audio signal, by with frequency be converted to the cycle
Ns, 1152Hz/1636Hz and 1452Hz/1936Hz replace the double-audio signal of change,
Frequency V is used during step S1 ~ S6, one interval [0.0,1.0）Button of the low frequency of change at random to user in Hz
Speed S is disturbed, and key-press rate is changed into random frequency,
User key-press speed is generally S=1.2 times/second, that is, 1.2Hz, by being changed into V=S ± V after random low-frequency interference, i.e.,
It is interval（0.2,2.2）Random rates in Hz, have impact on it is extraneous for user whether operating handset button judgement.
Disturbed the beneficial effects of the present invention are the mixing that various random audio frequencies are applied with to mobile phone keypad tone frequency, just
Calculate keypad tone to be trapped, due to not knowing how that decryption can not know corresponding key mapping, so as to privacy and property to people
Serve protective effect；Key-press rate is disturbed with the ultra-low frequency signal of 1Hz or so, makes the external world be difficult to distinguish user key-press
Operation；System intelligent, the special sound information that control unit is received according to supervising device judges whether to enable memory cell, root
Judge whether to call the random audio in memory cell to open interference according to the audio information specific for receiving, it is simple and convenient.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
Present invention specific implementation is confined to above-mentioned these explanations.For general technical staff of the technical field of the invention,
Without departing from the inventive concept of the premise, some simple deduction or replace can also be made, the present invention should be all considered as belonging to
Protection domain.
Claims (11)
1. handset dialing disk Voice Encryption method, it is characterised in that comprise the following steps：
Step S1, prestores irregular frequency audio and 12 button audios；
Step S2, monitors call voice, obtains the analog signal of call voice；
Step S3, judges to whether there is keyword in the call voice；
If judged result is no, return to step S2；
If the determination result is YES, step S4 is performed；
Step S4, input operation of the monitoring users to dial obtains the operation audio that user input operation is produced；
Step S5, calls 12 button audios, judge it is described operation audio frequency whether with keypad tone any one described
The frequency of frequency is identical；
If judged result is no, return to step S4；
If the determination result is YES, step S6 is performed；
Step S6, calls the irregular frequency audio, and the irregular frequency audio is mixed at random with the operation audio,
Obtain mixed random audio；
Step S7, exports the random audio.
2. handset dialing disk Voice Encryption method according to claim 1, it is characterised in that the step S3 is specifically included
Following steps：
Step S301）Prestore an at least keyword speech characteristic parameter；
Step S302）The analog signal to the call voice is carried out at pre-filtering treatment, sampling processing and A/D conversion successively
Reason, obtains an at least data signal；
Step S303）The data signal is pre-processed, the short signal of at least adding window of a frame sequence is obtained；It is described pre-
Treatment includes preemphasis treatment and adding window sub-frame processing；
Step S304）The short signal is analyzed, the speech characteristic parameter of call voice is extracted；
Step S305）The contrast speech characteristic parameter and the keyword speech characteristic parameter for judging call voice；If institute
The speech characteristic parameter for stating call voice is matched with any keyword speech characteristic parameter, then be judged as YES；If the call language
The speech characteristic parameter of sound is all mismatched with each keyword speech characteristic parameter, then be judged as NO.
3. handset dialing disk Voice Encryption method according to claim 2, it is characterised in that the step S304 is specifically wrapped
Include following steps：
Step S3041）The frequency spectrum of the short signal is converted into the non-linear spectrum based on Mel frequency markings；
Step S3042）The non-linear spectrum is transformed on cepstrum domain.
4. handset dialing disk Voice Encryption method according to claim 1, it is characterised in that 12 for prestoring
Button audio is touch-tone signal.
5. handset dialing disk Voice Encryption method according to claim 1, it is characterised in that
In step S1 ~ step S6, the interference of low frequency signal is added to user's finger key-press rate；The low frequency signal frequency is
One in interval [0.0,1.0）The random value of Hz.
6. a kind of handset dialing disk Voice Encryption system, it is characterised in that including：
Monitoring unit（1）, it is used to monitor call voice, the analog signal of call voice is obtained, and to monitoring users to dialling
The input operation of dialer, obtains the operation audio that user input operation is produced；
Keyword judging unit（2）, it is used to judge whether there is keyword in the call voice；
Memory cell（3）, prestore 12 button audios and irregular frequency audio；
Operation audio judging unit（4）, be used to call 12 button audios, judge it is described operation audio frequency whether with
The frequency of any one button audio is identical；
Audio mixing unit（5）, it is used to call the irregular frequency audio, by the irregular frequency audio and the operation
Audio mixes at random, obtains mixed random audio；
Mixed audio output unit（6）, it is used to export the random audio.
7. handset dialing disk Voice Encryption system according to claim 6, it is characterised in that the keyword judging unit
（2）Including：
Keyword feature parameter storage unit（201）, be used to prestore an at least keyword speech characteristic parameter；
AD conversion unit（202）, pre-filtering treatment, sampling processing are carried out to the analog signal successively to the call voice
With A/D conversion process, an at least data signal is obtained；
Pretreatment unit（203）, it is used to pre-process the data signal, obtain the adding window of an at least frame sequence in short-term
Signal；The pretreatment unit includes preemphasis processing unit and adding window sub-frame processing unit；
Speech characteristic parameter extraction unit（204）, it is used to be analyzed the short signal, the voice for extracting call voice is special
Levy parameter；
Speech characteristic parameter comparison unit（205）, it is used to contrast the speech characteristic parameter and the keyword of the call voice
Speech characteristic parameter；If the speech characteristic parameter of the call voice is matched with any keyword speech characteristic parameter, judge
It is yes；If the speech characteristic parameter of the call voice is all mismatched with each keyword speech characteristic parameter, it is judged as NO.
8. handset dialing disk Voice Encryption system according to claim 7, it is characterised in that the speech characteristic parameter is carried
Take unit（204）Including：
Frequency spectrum conversion unit（2041）, it is used to for the frequency spectrum of the short signal to be converted into the non-linear spectrum based on Mel frequency markings；
Frequency spectrum converting unit（2042）, it is used to be transformed into the non-linear spectrum on its cepstrum domain.
9. handset dialing disk Voice Encryption system according to claim 6, it is characterised in that 12 for prestoring
Button audio is touch-tone signal；The random audio that the default irregular audio frequency is mixed with each other including two or more
Frequency.
10. handset dialing disk Voice Encryption system according to claim 6, it is characterised in that also include
Low frequency cell, is used to generate the extraneous identifying user finger key operation of low frequency signal interference.
11. handset dialing disk Voice Encryption systems according to claim 6, it is characterised in that the handset dialing disk sound
The final output frequency of sound encryption system be user key-press speed and low frequency signal frequency and frequently or difference frequency.
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| CN201611012747.4A Pending CN106713611A (en) | 2016-11-17 | 2016-11-17 | Mobile phone dial voice encryption system and encryption method |
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