Device for measuring speech intelligibility

FIELD: computation engineering.

SUBSTANCE: device has object-oriented measurement tract correction mode. The device has test signal generator as sequence of N frequencies distributed over N strip means to which the hearing spectrum is divided with pauses between the frequencies, unit for transmitting test signals, microphone, N-bandwidth signal/noise ratio measurement unit, and computation unit for treating intelligibility. Manual generation frequency switch and pause switch mode is introduced. Level measurement unit is mounted in front of the transmitter. Controllable frequency characteristic adjustment unit is introduced in front of the signal/noise ratio measurement unit.

EFFECT: high accuracy and reliability of measurements.

2 dwg

 

The technical field.

The invention relates to speech recognition, specifically to the measurement of speech intelligibility under extremely adverse conditions, the noise at low signal to noise, and is intended primarily to determine the degree of protection of premises against unauthorized leakage of acoustic speech information in real conditions.

The level of technology.

There are various ways of measuring the intelligibility of speech. The simplest, but least accurate to evaluate the intelligibility ratio given by the integral of the level of the acoustic signal and the measured integral of the noise level in the listening position. More accurate methods - expert hearing at the place of reception of 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 ("Acoustics", reference book edited by Maspoch. M.: Radio and communication, 1989; Pampelmuse, Adducing "Electro-acoustic paths with feedback". M: Communications, 1962; GOST In 20775-75. "The voice transmission over communication paths, equipped with privacy. Requirements for speech intelligibility. Method of measurement"; Annavasal, Affain "fundamentals of theory and calculation of information-measuring systems", M.: Mashinostroenie, 1991).

In h is particularly in the above-mentioned works Pampacancha, Adducing "Electro-acoustic paths with feedback", str-143 and GOST In 20775-75 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 conditions of weak signals, i.e. when the intelligibility of speech syllables less than 25%, as it depends, in particular, from intelligence experts, and most importantly - consuming and requires the participation of a large number of experts.

A more objective method based on the sequential 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 at the anti-shudder performance of the acoustic signal, when 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, as you know, the parasitic channels of transmission of acoustic 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, Addchance. "Electro-acoustic paths with feedback," GOST In 20775-75, Useful model # 27259, publ. 10.01.2003). They provide a measure of intelligibility in any ratio signal/noise purely technical means, without the use of expert listening.

The present invention relates to improvements in such devices. The most successful device for a utility model certificate No. 27259, publ. 10.01.2003, bull. No. 1,2003.

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 device-prototype - figure 1.

The device consists of series-connected generators 1 N frequency test signal, the acoustic emitter (speaker) 2, placed in the place of the actual location of the sound source signals, a receiver of acoustic signals (microphone) 3, placed at the listening position, N-band meter 4 signal to noise for each frequency test signals and transmitter 5 levels of speech understanding.

The device operates automatically and synchronizes a clock synchronizer.

The device operates as follows. After placement of the loudspeaker 2 in place of the actual location of the source of acoustic information, and microphone 3 - in the listening position (the place of the alleged leakage of acoustic information) include the device. Generator 1 generates a sequence of N frequencies, distributed at medium frequencies N bands, which are divided audible range, with pauses between frequencies. For this purpose, the generator 1 has a frequency selector and a switch output, controlled clock synchronizer. Speaker 2 emits these signals with pauses. Mick is open 3 converts the received signals into electric, meter 4 signal to noise determines the signal/noise ratio for each frequency of the test signal. This meter has an input N-band filter, switched synchronously with the switching frequency generation by management on the clock synchronizer. Thus, at the input of the transmitter 6 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 ratios performs calculation of the speech intelligibility. The calculation is made on the basis of known techniques and theories, the essence of which is that, first, the above measured values of signal to noise determine the coefficient of intelligibility on each of the N frequencies, 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 determine the coefficient verbal intelligibility of speech (see, for example, article Ana and others, "the Correlation theory of speech intelligibility", in J. "Questions of Radioelectronics", series "General electronics", 1995, issue 1. p.3-9 and Nebroski "Calculation and measurement of speech intelligibility", M: the ligature, 1962).

The described device 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 a little. The application of the described device for the control of these parameters is not always acceptable due to the insufficient accuracy of measurement. The total acoustic signal leakage can be formed and non-linear ways, so to ensure the reliability of measurements must be made is the real signal level in the transmission, which is very small at the point of reception. It is also known that the level of real total acoustic signal at the point of transfer (location, source protected information) depends not only on the radiation power, but also from the secondary acoustic signals reflected from elements of design space (walls, ceiling, window glass), from reverberation noise (Laurentin. "Acoustics", M.: Higher school, 1978, Chapter VII), vibration, magnetic and educated in other ways. This dependence is nonlinear and castotnozawisimaya,which significantly reduces the reliability of the measurements of the coefficient of intelligibility. Moreover, to exclude the above deviation of the actual level of acoustic radiation from a given in advance unsurveyed premise is fundamentally impossible. Moreover, the acoustic characteristics even in advance of the surveyed premises in the place of radiation can significantly change when the atmospheric temperature, day and night, the presence and movement of equipment, furniture, people and much more.

Listed secondary acoustic signals in the known devices affect substantially the results of the measurement of speech intelligibility by reducing their accuracy and reliability.

But they should not affect the measurement results.

The objective of the invention.

The present invention is to improve the accuracy and reliability of measurement of speech intelligibility.

The solution is the essence of the invention.

The problem is solved by the fact that in the known device for the measurement of speech intelligibility, containing connected in series generator test signal as a sequence of N frequencies distributed according to the average frequency N bands, which are divided audible range, with pauses between frequencies, the emitter of the test signal, the microphone, the N-band meter signal to noise and the transmitter, and the generator and N-band meter are synchronously control Jaimie clock synchronizer switches frequencies and bandwidths,

important changes and additions, namely:

- in generator test signal introduced to the manual mode switching frequency generation and pauses between them,

- directly in front of the radiator has a level meter, the output of which is connected to the comparator,

before measuring the signal to noise introduced adjustable offset frequency characteristics.

Disclosure of the invention.

The essence of the invention is to provide measurements of the source to calculate the signal to noise at a given level of each frequency N frequency acoustic test signal, because of possible deviations from the specified level due to reflections, resonances, non-linearity of the emitter, etc. in advance, before the beginning of measurements will be counted, measured and compensated in the place of reception (listening). This operation we called object correction, because it addresses mainly the specific distortion measurements associated with features of the objects (buildings).

The invention is illustrated a simplified structural diagram of the device presented in figure 2, where the following notation: 1 - generator N-frequency test signal, 2 - acoustic emitter 3 receiver of acoustic signals (microphone), 4 - N-band meter signal Shu is, 5 - the evaluator level of intelligibility, 6 - meter level of the acoustic signal at the site of radiation, 7 - comparator, 8 - adjustable offset frequency characteristics, 9 - input manual control of the generator.

The device consists of series-connected generator 1 N-frequency test signal, with the input 9 of manual control, the loudspeaker 2, placed in the place of the actual location of the sound source signals, a microphone 3, placed at the listening position, adjustable corrector 8 frequency characteristics, N-band meter 4 signal to noise and transmitter 5 level of speech intelligibility. Directly in front of the acoustic emitter 2 posted by meter 6 level of the acoustic signal, the output of which is connected to the comparator 7.

The device operates as follows.

Place the source of the acoustic test signal (speaker 2) at the point of placing the real source of the acoustic signal and the acoustic signal receiver (microphone 3) at the point of possible placement of the receiver of acoustic information. Before measuring the intelligibility of speech produced object correction of frequency response measurements, which switch the generator 1 in manual mode (9), and in turn generate generate the rum 1 and emitted by the loudspeaker 2 separate tone frequency N frequency test signal of a specified level. Meter 6 acoustic signal at each frequency measures the actual level of the acoustic signals directly at the place of their radiation. The measured level of the acoustic signal is compared with a given (estimated) level at this frequency by the comparator 7. After determining the deviation of the measured level from the predetermined adjustable corrector 8 changing the gear ratio at this frequency to compensate for the difference between specified and measured levels of the test signal in place of their real radiation. This procedure is repeated for each frequency of the test signal.

Then move to measuring the intelligibility of speech produced by the same prototype. Go to the automatic mode of the device. Generator 1 generates, emitter 2 emits N-frequency acoustic test signals to the specified level, which represent a sequence of N tone frequencies distributed according to the average frequency N bands, which are divided audible range, with pauses between frequencies. At the point of measurement microphone 3 accepts the received acoustic signals, as in the radiation test frequencies, and the pauses between them, transforming them into electrical signals. The received electrical signals are corrected by the corrector 8, after which they analiziruyut the I N bandpass filters, frequency, corresponding to the frequency of the test signal, measured the levels of received signals, and then determines the signal-to-noise ratio for each frequency of the test signal and calculate the speech intelligibility in the real background noise based on the correlation theory of speech intelligibility (see, for example, article Vchgetdate "the Correlation theory of speech intelligibility", in J. "Questions of Radioelectronics", series "General electronics", 1995, issue 1, p.3-9), which is the development aspect of speech intelligibility (Nebroski. "Calculation and measurement of speech intelligibility", M: Communications, 1962) and utility models of the Russian Federation No. 27259

The main difference of the claimed device from the prototype that is closest to the technical essence is the introduction of several new items and additional mode of operation of the generator to ensure the object the correction of the frequency characteristics of the tract measurements.

New in the invention is -

- introduction of manual control of the generator test signal,

- introduction of the level meter test signal directly to the spot of radiation test signals

- introduction device comparing the measured and the specified levels of the test signals,

- introduction of an adjustable offset frequency characteristics before measuring the relationship of the signal is noise.

Such a device it is not known from available information sources.

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

Industrial applicability.

The claimed device can be easily done as a circuit, and software. Circuit - means, well-developed industry, which follows from the above description of the exemplary embodiment. In particular, the manual control mode generator is provided, for example, by disabling a clock synchronizer. Measurement of the actual level of the acoustic signal can be performed by the level meter. Comparison with the specified level can be made visually (by comparison with the standard) or subtractive device. Adjustable offset frequency characteristics can be, in particular, the band-pass tone control.

The device is built on the FSUE "Informacoustica", successfully passed Metrology and certification tests and are already applied when measuring the ratio of 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 reliability and accuracy of measuring the intelligibility of speech. In particular, the guaranteed lower preventability signal-to-noise ratio was 10 dB below the zero level, the hearing threshold of the ear (2× 10-5PA), resulting in the value of intelligibility is reduced by 1.5 times. The measurement error was reduced by more than half due to the elimination of the influence of secondary sources of acoustic signals. The accuracy of determination of speech intelligibility in conditions of weak signal and high noise level allows guaranteed to establish the absence of channels of information leakage, because intelligibility is determined by the following normalized values of specified regulatory and methodological documentation.

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

Device for measuring the intelligibility of speech containing point to the location of the acoustic source signal connected in series generator test signal as a sequence of N frequencies distributed according to the average frequency N bands, which are divided audible range, with pauses between the frequency and the emitter of the test signal, and the measurement point contains one United microphone, N-band meter signal to noise and the transmitter intelligibility, and generator test signal and the N-band meter are synchronously controlled clock synchronizer switches frequencies generations and bandwidth characterized in that the generator test signal introduced to the manual mode switching frequency generation and pauses between them, directly in front of the radiator has a level meter, the output of which is connected to the comparator, and before measuring the signal to noise introduced adjustable offset frequency characteristics.



 

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