SU365824A1 - ALL-UNION - Google Patents

Description

one

The device relates to the field of acoustic circuitry and is intended to be used for testing in the objective measuring devices.

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Functional generators for the length of the equivalent of damping but loudness are known, in which the speech signal passes through the tested traast, under the blink of a switch,: I1H is spirited in time and

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However, in known devices, the scaling time may be changed under the influence of temperature, feeding power, circuit aging, etc., from mepeium, which leads to the corresponding measurement error of equipotential damping.

In order to improve the accuracy of the measurement, in the proposed generator, between the generator control: the generator of the generator, the input converter of the fi tastor ti.p.

The drawing shows a block diagram of a conventional device.

The functional generator contains a controlled generator 1, a correction cable 2, a detector 3, an integrator 4, which form the feedback iKOHTyp. In addition, the generator includes a control unit 5.

In the initial state, the first and second oscillator / generates a constant frequency of 4000 Hz. The voltage of the constant amplitude from the output of the controlled oscillator / through the correction 1Y circuit 2 and the detector 3 is supplied

to the input of the integrator 4, built on the basis of the inhibited phase input, which is in a steady state, and its output voltage, which enters the input of the controlled generator, is constant.

The contacts of the relay of the control unit 5 are 1M: whips, the input circuit of the integrator 4 of the receiving part 1 meter rupture.

With the output; : a "quiescent state" circuit by starting the phase integrator, the voltage at its output begins to decrease at a rate dependent on the input voltage. Change ex. the integrator, in turn, causes a change in the frequency at the output of the controlled oscillator /, and

as a result, the amplitude of the signal at the output of correcting circuit 2 and detector 3 occurs, which accordingly leads to a change in voltage at the output of integrator 4, and therefore to a further change in frequency, and the speed of frequencies is proportional to 1 / A.

Thus, the frequency of the output signal is reduced from 4000 g // to the lower frequency, roughly equal to 200 Hz, in functional terms.

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The fantastran, having reached the lower threshold, automatically returns to its original state, and the mileage quotes.

During the frequency run, hiring from the moment the front | strone is sewn up to returning to the Initial state, it operates the relay of the control unit 5, which by its contacts turns on the receiver integrator for the time determined by the front-end integrator.

Phaitaspron cxeiMa allows you to set the measurement time with high accuracy, which increases the touch of measuring the knowledge of the zatuuh-luvstii valence, while the IB sabotage setting of the last running tone frequency can be in the order of magnitude.

Subject and d on and e and

F: un Kts1I101Nalnogo g-e ра rator for measuring s “k13I1vale1Nta attenuation on loudness, containing a controllable oscillator, the output of which is inclined, followed; characterized in that, in order to increase the accuracy, I31 is measured ", between (the INPUT of the controlled generator and the detector input is additionally introduced by an integrator of a type-south type).