Method for measuring maximal legibility of speech

FIELD: technology for measuring maximally possible legibility of speech under extremely unfavorable conditions, in the noise, for low signal/noise ratios, and is meant mainly for determining protection of objects during loss of speech information through several leaking channels simultaneously.

SUBSTANCE: in accordance to method, in receipt point K receivers of other signal types, formed by acoustic testing signals, for example, electric, magnetic, vibro-acoustic signals, are positioned, acoustic and aforementioned K signal types formed in receipt position at all N frequencies of testing signal and in pauses between same, are received and measured separately, on basis of results of measurements signal/noise ratios are determined at each frequency of testing signal by each one of acoustic and K other types of received signals, at each frequency of testing signal greatest one of signal/noise relations are selected, measured by acoustic and K other types of received signals, then - speech legibility grade is calculated on basis of greatest signal/noise ratios.

EFFECT: increased trustworthiness of speech legibility measurements.

2 dwg

 

The technical field

The invention relates to speech recognition, specifically to the measurement of the maximum possible speech intelligibility under extremely adverse conditions, the noise at low signal to noise, and is intended primarily to determine the degree of protection against leakage of voice data across multiple leak paths simultaneously, i.e. in real terms.

The level of technology

There are various ways of measuring the intelligibility of speech. Popular expert listening in place of receiving acoustic signals, composed of specially selected phrases, words or syllables (programs)that are emitted in the place of generation of the speech, with subsequent processing of the results to determine the intelligibility (Pampelmuse, Adducent, "Electro-acoustic paths with feedback", - M.: Communication, 1969; GOST 71-53-85 "Measuring the intelligibility of speech or touchtone method"; GOST In 20775-75. "The voice transmission over communication paths, equipped with privacy. Requirements for speech intelligibility. Method of measurement"). These papers described this method of measurement used in this apparatus and methods of mathematical processing. The method is technically simple, but not reproducible and accurate in terms of weak acoustic signals, depending on the intelligence experts, and most importantly - TRU is oemar and requires the participation of a large number of experts.

A more objective method based on coherent acoustic radiation of separate tonal components of the audible spectrum in the transmission and determining any experts of their threshold of audibility in the receive location, and actually receive location can only be microphones connected via amplifiers with headphones experts (Nebroski, "Calculation and measurement of speech intelligibility" - M.: Communication, 1962). The acoustic radiation level of each component is increased to the threshold of hearing her an expert. Recorded radiation levels mathematically processed taking into account the curve of human audibility and thus determine the minimum level of the speech signal to obtain a given speech intelligibility at the receiving location. The information, of course, can also be used to determine the maximum level of the acoustic signal, wherein in the predetermined acceptance speech is guaranteed to be legible, i.e. provided with a certain level of protection against leakage of acoustic information. However, this method is time-consuming, because it requires the participation of many experts and time. In addition, the estimate of intelligibility is not on the real level of acoustic signals, and those that meet the threshold of hearing at the specified location. This is often unacceptable because the AK is known, parasite transmission channels of audio information (walls, floors, Windows, furniture, doors etc) usually unevenly attenuate frequency components of speech and the protection of information from leakage, calculated according to the results of the above measurements may not correspond to actual.

Currently, the most common instrumental methods based on the tonal method of speech intelligibility (e.g., Pampelmousse, Adducent, "Electro-acoustic paths with feedback" - M.: Communication, 1969, GOST In 20775-75, Useful model # 27259). They provide a measure of intelligibility in any ratio signal/noise purely technical means, without the use of expert listening. Most modern device patent for useful model №27259, publ. 10.01.2003. It is the closest to the claimed method according to most of the essential features and, therefore, selected as a prototype.

Below is a detailed description of the prototype method.

The method involves placing a source of the acoustic test signal at the point of placement of the source speech signal, and receiver - in point to the location of the receiver unauthorized leakage of acoustic information. Emit a sequence of tonal sound frequency specified level with pauses between them, and the frequency of the radiation is raspredelenie on the mid frequencies N bands, which is divided audible range of speech. During the radiation of each frequency receiver test signal through a bandpass filter tuned to this frequency, and take measure of the total acoustic signal is formed at the place of reception on this frequency and acoustic noise in this band. While paused, the same receiver receive and measure the signal noise in this band. According to the results of measurements determine the power value of a received signal of this tonal frequency, on the basis of independent linear summation of the capacities of the signal and noise determine signal/noise ratio on this tone frequency. Then the procedure is repeated on the next tone frequency, then the next, until you have defined the relation signal/noise at all tone frequencies of the test signal. In certain respects, the signal/noise at all tone frequencies of the test signal to compute the intelligibility of the speech signal on the real background noise on the basis of known techniques (see, for example, article Ana and others, "the Correlation theory of speech intelligibility" in the journal "electronics", series "General electronics", 1995, issue 1, p.3-9; Nebroski "Calculation and measurement of speech intelligibility", - M.: Communication, 1962).

In other words, the essence of the method, like most other instrumental methods ISM is rhenium intelligibility, is a series of radiation at the point of transfer N test tone acoustic oscillations in the speech frequency range, the acoustic received signals at a given point of reception, the N-band measure of signal to noise for all N frequencies of the test signals and the subsequent calculation of the coefficient of intelligibility - known methods. The essence of the method is illustrated in figure 1 - example of a simplified structural diagram of the method where: 1 - generator N frequency test signal, 2 - acoustic emitter (speaker), 3 - receiver of acoustic signals (microphone), 4 - N-band meter signal to noise ratio, 5 - evaluator level of speech intelligibility.

The device consists of series-connected generator 1 of the test signal, the loudspeaker 2, placed in the place of the actual location of the sound source signals, a microphone 3, placed at the listening position, N-band meter 4 signal to noise ratio on each of the N frequencies of the test signals and the transmitter are 5 levels of speech understanding.

The device operates as follows. After placement of the speaker 2 and the microphone 3 in these locations include the device. Generator 1 generates an acoustic test signal to the specified level, consisting of posledovatel the values of N frequencies, posted by average frequency N bands, which are divided audible range of speech. Speaker 2 emits the specified signals. Microphone 3 converts the signals received at the specified radiation and in the pauses between) into electricity. During pause this receiver accept and measure only the noise in this band. According to the results of measurements determine the power value of a received signal of this tonal frequency, on the basis of independent linear summation of the capacities of the signal and noise determine signal/noise ratio on this tone frequency. These operations produces N-band meter 4 signal to noise for each frequency of the test signal. Thus, at the input of the transmitter 5 level of intelligibility in turn receives the measured ratio of signal to noise for all N emitted frequencies. The transmitter 5 level of intelligibility on the measured signal to noise makes calculation of speech intelligibility. The calculation is made on the basis of known relationships and theories, the essence of which is that initially above the measured signal to determine the noise intelligibility coefficients for each frequency of the test signal. In certain respects, the signal/noise ratio calculates the ratio of speech intelligibility in the real background noise on the basis of known techniques (see, for example, article A.A. is Kolesnikova and other "The correlation theory of speech intelligibility" in the journal "electronics", 1995, issue 1, p.3-9; Nebroski "Calculation and measurement of speech intelligibility", M.: Communication, 1962).

Them determine the average (arithmetic mean) value of the coefficient of intelligibility. Then at a certain average value of the coefficient of intelligibility and known curve verbal intelligibility from the value of the coefficient of intelligibility define verbal intelligibility of speech (see, for example, article Vchgetdate and other "Some methodological approaches to the evaluation of protective efficacy of verbal information" in the magazine "Special technique", 2000, No. 4, p.39-45).

The described method is widely used for measuring the intelligibility of speech, i.e. to determine the quality of listening. Currently, however, no less significant problem was the fight against eavesdropping, i.e. reducing the legibility in places of possible information leakage, prevent unauthorized listening. In this case (unlike the problem of determining the quality of listening) the ratio signal/noise is small and the attacker is difficult to parse the speech signal. As is known, in such cases, eavesdropping use not only the acoustic, but also all other possible channels of information leakage, catching the processing, in particular, magnetic and electric fields generated by reinforcement systems, and vibro-acoustic fluctuations associated with its work. The signals of these channels may in some cases be more legible than acoustic. In such cases, the application of the described method for controlling the intelligibility of speech is not acceptable, it does not reflect possible level of speech intelligibility.

Naturally, the above-described acoustic measurement method can be modified and adapted for measuring the intelligibility of speech over other possible channels of information leakage, the most significant of which are magnetic, electric and acoustic vibration channels. Then we can estimate the maximum level of intelligibility, as the greatest of all these channels. However, this detection method does not reflect the real level of protection of verbal information from unauthorized eavesdropping, because when you use to listen to recordings of signals of all possible leak paths possible further joint processing of these records to extract speech information. For example, in the textbook Aghajanova, Ali and other "noise Immunity of information systems management", M: MAP "World book", 1993, describes the optimal discriminator two deterministic signals,the maximum likelihood estimation of the parameter signal with the initial phase and optimal signal processing for models of the useful signal with a random initial phase in the form of a quadrature signal processing. This may allow you to get the level of intelligibility, greater than the maximum in any of the individual channels. This possibility stems from the fact that, as you know, each channel of information leakage castotnozawisimaya, respectively, of the frequency dependence of the signal to noise of different channels. The ratio signal/noise will be different in the same frequency band by different channels of leakage. Based on this hypothetically possible the most sensitive, the most efficient way of increasing the intelligibility of speech, providing separation was obtained for analysis of the signals from each channel into several frequency bands and the enumeration of all possible combinations of signals of the frequency bands of the channels between them for superior intelligibility. The implementation of such a way of eavesdropping, of course, requires a lot of time, sophisticated equipment, but nevertheless it is possible.

For the evaluation of protection for sound amplification equipment in such a multi-method eavesdropping (which, to our knowledge, yet nowhere hardware is not implemented, but is quite feasible) required methods of measurement for maximum intelligibility, taking into consideration its limits. We called it the dimension maximum intelligibility".

The known method is the prototype of such measurements can not provide.

Task invented the I

The present invention is to increase the reliability of the measurement of speech intelligibility.

The solution is the essence of the invention.

The problem is solved by the fact that in the known method for measuring the intelligibility of speech, providing for the placement of the source of acoustic test signal at the point of placement of the source speech signal, and the receiver of the acoustic signal at the receiving end of verbal information, coherent radiation N-frequency acoustic test signal to the specified level with pauses frequencies, and the frequency of the radiation is distributed at medium frequencies N bands, which are divided audible range of speech, reception and measurement of acoustic signals generated in the receiving location for all N frequencies of the test signal and the pauses between them, determine the results of measurements of the ratio signal/noise on each the frequency of the test signal, the subsequent calculation of the level of speech intelligibility by certain signal to noise made significant changes and additions, namely:

- at the point of reception is additionally place To receivers of other types of signals generated acoustic test signal and, for example, electrical, magnetic, vibroacoustic signals

- accept and measured separately To these types of signals is s, educated at the place of reception for all N frequencies of the test signal and the pauses between them,

- determine the results of measurements of the signal-to-noise ratio for each frequency test signal To each of kinds of received signals,

- choose at each frequency of the test signal is the largest signal to noise ratio, measured by acoustic and other types of received signals,

and calculate the level of speech intelligibility by the highest ratio of signal to noise.

Disclosure of inventions

The essence of the invention is to provide measurements of intelligibility when the largest of all types of received signals ratios of signal to noise in each frequency band. When unauthorized eavesdropping conditions for obtaining maximum intelligibility, even in theory, may not be the best. Thus, we define the maximum speech intelligibility.

An example of a simplified block diagram of a device that implements the described method, are presented in figure 2, where the following notation: 1 - generator N-frequency test signal, 2 - acoustic emitter (speaker), 3 - receiver of acoustic signals (microphone), 4 - N-band meter signal to noise ratio, 5 - evaluator level of intelligibility, 6 - magnetic signals, 7 - receiver electrical signal is 8 - the receiver vibroacoustic signals, 9 - switch type signal, 10 - device selecting the highest signal-to-noise ratio, 11 - clock synchronizer.

The device consists of series-connected generator 1 of the test signal, the loudspeaker 2, placed in the place of the actual location of the source of speech signals, a microphone 3, the receivers 6, 7, 8 magnetic, electric and vibroacoustic signals, placed at the listening position, the switch 9 type of signal, the N-band meter 4 signal to noise, the device 10 selecting the highest signal-to-noise and transmitter 5 levels of speech understanding.

The operation of the device is synchronized such synchronizer 11.

The method is implemented as follows.

Place the source of the acoustic test signal (speaker 2) at the point of placement of the source speech signal, and the acoustic receivers 3, magnetic, 6, 7 electric and vibroacoustic 8 signals at the receiving end of verbal information.

Generate (1) and radiate (2) test acoustic signal of a given level, which is often a sequence of tonal frequencies distributed according to the average frequency N bands, which are divided audible range, with pauses between frequencies. This radiation and pause at each frequency is Ilichevsky repeat K+1=4 times. Alternately, when the switch 9 are (2, 6, 7, 8) and is measured at the point of reception of the received acoustic, magnetic, electric and acoustic vibration signals in the radiation and in the pauses between them, share them narrowband filters at frequencies corresponding to the frequencies of the test signal, measure the levels of received signals, for each type of signals (often acoustic, magnetic, electric and acoustic vibration) define the signal-to-noise ratio for each frequency of the test signal (4). Narrowband filters 4 meter switch synchronously with a change in frequency of the test signal 1 synchronizer 11. Then the device selection 9 is chosen for each frequency of the test signal (i.e. each band of the audible spectrum with the highest signal-to-noise ratio. Thus, at the input of the transmitter 5 level of intelligibility in turn receives the highest signal/noise for all N emitted frequencies. The transmitter 5 level of intelligibility on the measured signal to noise makes calculation of speech intelligibility. The calculation is made on the basis of known relationships and theories, the essence of which is that initially above the measured signal to determine the noise intelligibility coefficients for each frequency of the test signal. Them according to which averaged the second (average) value of the coefficient of intelligibility. Then at a certain average value of the coefficient of intelligibility and known curve verbal intelligibility from the value of the coefficient of intelligibility determine the maximum verbal intelligibility of speech (see, for example, article Vchgetdate and other "Some methodological approaches to the evaluation of protective efficacy of verbal information" in the magazine "Special technique", 2000, No. 4, p.39-45).

The main differences of the claimed method from the prototype:

- at the point of reception - additional accommodation To receivers of other types of signals generated acoustic test signals such as electrical, magnetic, vibroacoustic signals

- reception and measurement of separately specified For other types of signals received by the receiving location for all N frequencies of the test signal and the pauses between them,

- determination based on measurements of signal to noise for each frequency test signal for each of the other types of received signals,

the choice for each frequency of the test signal is the greatest of the ratio signal/noise ratio, measured by acoustic and other types of received signals,

- calculation of the level of speech intelligibility by the highest ratio of signal to noise.

This way we are not aware of the available sources of information is AI

The combination of the above differences is the creative achievement of the inventor, it is not obvious for the expert.

Industrial applicability

The claimed method is easily implemented as a circuit or programmatically. Circuit - means, well-developed industry, which follows from the above description of the example execution.

In particular, to receive acoustic signals by microphone, magnetic signals from a magnetic antenna (see, for example, Patent RF №2152624 "measuring the tension of a magnetic component of an alternating electromagnetic field, the electric signal is an electric antenna (see, for example, patent RF №2152623, vibroacoustic signals piezoelectric transducer (see, for example, Ikkalasida and other "fundamentals of hydro-acoustics and sonar station, Leningrad: Sudostroenie, 1970).

Select the highest value of signal to noise can be performed, for example, on the basis of the scheme OR schemes of remembering.

Other components of the method of generating a sequence of N test signals, radiation, N-way measurement of signal to noise, the calculation of the level of intelligibility is repeatedly implemented in the known methods of measurement of intelligibility (see, for example, testimony 27259 for a utility model publ. 10.01.2003 in bull. No. 1 for 2003).

The claimed method d is litvan at FSUE "Informacoustica", successfully passed Metrology and certification tests and is already used in the measurements, the maximum speech intelligibility. Any practical difficulties associated with the use of the invention, is not met.

Actually received benefits before the prototype consist in increasing the accuracy of the level measurement of speech intelligibility. Measured guarantee really potentially maximum intelligibility, taking into account the use of a listening face all the possible leakage of verbal information. In particular, maximum intelligibility measured in the testing process when used in addition to the acoustic channel of only one magnetic channel was higher than 5 dB than measured by the method of the prototype. This inaccuracy in the practice invalid.

The achieved accuracy of the determination of speech intelligibility enables you to securely install the absence of channels of information leakage, because intelligibility is determined based on the use of all possible leakage paths and the most efficient processing of their signals.

Thus, in our opinion, the claimed technical solution meets all the criteria applicable to the invention, - it is new, not obvious and industrially applicable.

The method of measuring the maximum time is orciuoli speech, providing for the placement of the source of acoustic test signal at the point of placement of the source speech signal, and the receiver of the acoustic signal at the receiving end of verbal information, coherent radiation N-frequency acoustic test signal to the specified level with pauses between the radiation frequency, and the frequency of the radiation is distributed at medium frequencies N bands, which are divided audible range of speech, reception and measurement of acoustic signals generated in the receiving location for all N frequencies of the test signal and the pauses between them, determine the results of measurements of the ratio signal/noise for each frequency of the test signal, the subsequent calculation of the level of speech intelligibility on certain the signal to noise ratio, characterized in that at the point of reception is additionally place To receivers of other types of signals generated acoustic test signal, such as electrical, magnetic, vibroacoustic signals, receive and measure separately acoustic and specified To the types of signals generated in the receiving location for all N frequencies of the test signal and the intervals between them, are determined by the results of measurements of the signal-to-noise ratio for each frequency test signal for each of the acoustic and other types adopted the x signal, choose for each frequency of the test signal is the greatest of the ratio signal/noise ratio, measured by acoustic and other types of received signals, and then calculates the level of speech intelligibility by the highest ratio of signal to noise.



 

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