SU1251306A1 - Device for detecting tone period of complex signal - Google Patents

Abstract

The invention relates to a pulse technique, can be used in oscillation conversion devices. The purpose of the invention is to increase the reliability of operation with simultaneous expansion of functionality - it is achieved by introducing a peak detector 7 and an adder 8 into the device. In addition, the device contains an operational amplifier 1, resistors 2, 4 and 5, an input signal bus 3, a reference signal bus 6. The introduction of a peak detector and an adder ensures that the comparator triggers the trigger amplitude over the maximum amplitude of the input signal. In this case, the period of the signal with the highest amplitude, i.e. period of the fundamental tone of a complex signal. 1 il. (Lu jv co o o5 o and on

Description

The invention relates to pulsed tsxx and can be used in oscillation conversion devices.

The aim of the invention is to increase the reliability of work with simultaneous expansion of functionality.

The drawing shows a structural electrical circuit of the device.

The device contains an operational yci -: - line 1, the inverting input of which is connected via the first resistor 2 to the 3 input signal, the non-inverting input is connected to the first output of the second resistor 4, the output and non-inverting input of the operational amplifier are connected via the third resistor 5, 1 6 of the reference signal , peak detector 7, adder 8, the output of which is connected to the second output of the second resistor 4, the first input with H1INE 6 of the reference signal, the second input with the output of the peak detector 7, the nerves and the input of which is connected to L1ina 3 V. I drove.

The device works as follows.

When a complex signal is applied to the busbar 3, a voltage appears at the output of the detector 7 of the peak level equal to the maximum value of the input signal (the charge-discharge time states; ia of the detector's output capacitance are chosen equal to 5 ... JT, where T - the average period of the input signal), the output signal of the detector 7 is fed to the first input of the adder 8, the second input of which is connected to the reference signal bus 6, the output of the sum of the armature results in summing the voltage different from the voltage of the peak detectorand

0.05 ... 0.1 L BX, where Uii.N is the maximum swing of the input signal. The output signal of the adder 8 is fed to the inverter input usg; the detector 1, to the inverting input of which an input signal is given. Thus, the amplifier compares the inlet of the pus signal with a constant reference level, and with the change in the normalization level of the input signal the voltage level coming from the output of the s.Mmator.

Due to the introduction of a nickel detector and adder, the comparator triggers the trigger threshold of the maximum amplitude of the input signal, thereby isolating the period of the signal with the largest amplitude, i.e. period of the fundamental tone of a complex signal.

Formula ai:, of) p in geni

The device is in (1 division of the period of the main 0 tone with; 1 signal containing an operational amplifier; an inverting input K (the primary is connected via the first resistor to the input signal bus; the non-inverting input is connected to the first output of the second resistor, the output and the inverting operative input of the pion the amplifier is connected via a third resistor, oriopHOi bus signal o. characterized by a test circuit that, with respect to reliability of operation with simultaneous expansion of functionality, a peak detector, sum.mator, whose output is connected, is introduced into it. dinene with the second output of the second resistor, the first input from the shiyuy reference signal, the second input from the output of the peak detector, the first input of which is connected to the bus) sig} | ala.

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Claims (1)

A device for extracting the period of the main drive of a complex signal, containing an operational amplifier, the inverting input of which is connected through the first resistor to the input signal bus, the non-inverting input is connected to the first output of the second resistor, the output and the non-inverting input ^{25 of the} operational amplifier are connected through the third resistor, the reference signal bus. characterized in that, in order to increase the reliability of work while expanding the functionality, a peak detector, an adder, the output of which is connected to the second of the second resistor, the first input of the reference signal, the second input by the output with the bus with the output of the peak detector, the first input are introduced into it which is connected to the input signal bus.