SU1406538A1 - Method of checking identity of parameters of matrix electric devices - Google Patents

Abstract

The invention serves to increase the reliability of the control, the parameters of the matrix electrical devices. For this, a sequence of electrical impulses (I) of constant duration with frequency is formed. N, where F is the sound frequency, N is the number of elements in the monitored device. The formed sequence is transformed into sound pressure and perceived as a sound stimulus. The latter corresponds in loudness to the degree of difference between the parameter of an element and the height of the current - the number of defective elements. The device that implements the method contains a source of light 1, a capacitor 2, an analog switch 4, a counter 5, a generator 6 clocks And, a power amplifier 7, an electroacoustic former 8 and a frequency setting organ 9. A feature of the method is the use of the effect of smoothing pulses of acoustic pressure in the ear, in which the magnitude of the pulses is proportional to the value of some parameter of each of the elements of the matrix. This feature allows us to quickly identify the presence of defective electrical devices in the matrix, to assess their number and the degree of difference in their parameters compared with other devices. ramie. 1 37 p. files, 2 Sh1. s / s

Description

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The invention relates to methods for monitoring parameters of semiconductor and electrical devices of the matrix type and can be used in the manufacture of electronic equipment.

The aim of the invention is to increase the reliability of control by introducing a quantitative and qualitative assessment of the error when using the psychoacoustic smoothing effect in the ear.

This goal is achieved by the fact that, in the method of controlling the identity of the parameters of matrix electric devices, a sequence of electric pulses of constant duration is formed with a frequency determined by the ratio

 (kHz),

where f is the pulse frequency; F - sound frequency; N is the number of elements in the controlled device,

which then transform the sound pressure pulses and. perceive them as a sound stimulus, corresponding in loudness to the degree of difference between the parameter of an element and the height of the current — the number of defective elements.

FIG. Figure 1 shows a diagram of a device that allows the proposed method to be implemented; in fig. 2 - graphs of the signals at the output of the switches.

The device contains a light source 1, a capacitor 2, the device under test 3, for example a photodetector matrix, an analog switch 4, a counter 5, a generator of 6 clock pulses, a power amplifier 7, an electro-acoustic converter 8 (loudspeaker, a frequency setting organ 9

The outputs of each of the photodetectors of the matrix 3 are alternately connected to the input of the amplifier 7 through a switch 4 controlled by a generator 6 clock pulses through a counter 5. A frequency setting body 9 connected to the regulating inputs of the generator 6 provides for adjusting the frequency of the generator according to the auditor's individual hearing sensitivity (controller). The output of the amplifier 7 power is connected to the input of the electro-acoustic transducer 8.

The device works as follows.

The light from the light source 1 through the capacitor 2 uniformly illuminates the test photoreceiver matrix 3. In this case, the input action, in this case light, is converted into an electrical signal in each of the elements of the monitored device. The generator 6 generates pulses arriving at the counter 5, the parallel code from the outputs of which controls the operation of the switch 4, i.e. alternately connects the outputs of the photodiodes of the matrix 3 to the input of the power amplifier 7, thus forming a sequence of electrical pulses.

Photo receivers are polled in turn from first to last, then the cycle repeats. The pulses at the switch output correspond to the amplitude of the emf produced by photodiodes under the action of light. The pulses are amplified to the required level by amplifier 7 and fed to an electro-acoustic transducer 8 having a low inertia, for example, a piezoelectric or dynamic tweeter. The acoustic pressure pulses, in the spectrum of which there is a frequency of the audible frequency range, are perceived by the operator as the tone of the sound frequency in accordance with the physiological characteristics of the person’s hearing. This determines the choice of the sampling frequency of the photodiode array, based on the maximum sensitivity of a person's hearing to it, for example, I kHz. Let it be necessary to check the line of photodetectors of 50 elements, the frequency of repetition of polling cycles F take 1 kHz. With the complete identity of the elements, there will be a sequence of rectangular pulses of the same duration and amplitude, and a frequency of 50 kHz, which is higher than the frequency range of human frequencies.

The sequence of unipolar rectangular pulses formed at the output of the switch, in the case of the identity of all elements, contains a constant component

1 1 D f l e (t),

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Vj, is the pulse duration;

T is the period of the following pulses. E is the amplitude of the pulses; a - zero harmonic amplitude

Where

Amplitude of the nth harmonic 2 Pu / g

a „- Se (t) cosnw tdt

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Thus, the expression for the pulse train (Fig. 2b) is written as

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e (t) E (Vf, t cosnw, t) lowest frequency

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those. the smallest frequency in the signal spectrum is outside the audio range and is not perceived. human hearing.

In the event that one or several devices differ from the others, the sequence of pulses at the output of the switch (Fig. 2a) can be represented as the sum of two sequences: the spectrum of the sequence, similar to Fig. 2b, and the spectrum of a sequence of pulses following with a frequency nF (Fig. 2c), where n is the number of defective devices (in Fig. 2). Obviously, in this case, the signal spectrum falls within the sound range and is perceived by a person as a tone with frequency nF.

If the number of defective photodetectors is 2, 3, 4, etc., the frequencies of 2, 3 and 4 frequencies will be present in the spectrum of the sound pressure pulses. kHz, i.e. Possible quantitative and qualitative (since the volume of the sound stimulus depends on the degree of identity of the parameters of photodetectors in the matrix) device evaluation.

Similarly, you can control

To identify the identity of the parameters of individual sections in the battery pack or dry battery, where the chemical reaction energy acts as an external influence.

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Claims (2)

1. A method of controlling the identity of the parameters of the matrix electric devices, which consists in supplying an input effect to each of the elements of the matrix electric device in the nominal operating mode, register the resulting output signals, form a sequence of electrical pulses, characterized in that, in order to increase reliability of control, maintain a constant duration of electrical impulses in sequence, and the repetition rate is equal to , where f is the frequency of electric pulses of constant duration; N is the number of elements in the controlled matrix electric device; F is the frequency of the sound range; electrical impulses are converted into a sound pressure signal using a pyhoacoustic smoothing effect in hearing and by the presence of an audible sound signal, the presence of nonidentical elements in a controlled matrix electric device is judged. 2. The method according to claim 1, that is, the fact that by the volume of the audible sound signal is judged the degree of difference of the monitored parameter from the specified value, and by the tone height - the number of defective elements in the matrix electrical appliance. and but P p p p p p p p p p p p p r p five 1 П П П П П П П П П П .. na Phie.g