SU792174A1 - Apparatus for analysis of electric signal shape - Google Patents

Description

signal shifting register 3, decoder 4; amplifier 5 with automatic gain control, bandpass filters b, rectifiers 7, smoothing filters 8, adder 9

The device works as follows.

The analyzed signal is fed to the input of the amplifier 5, which maintains a constant signal amplitude at its output if the voltage at its input varies within the specified limits. The output signal of amplifier 5 is fed to the inputs of bandpass filters b and delta modulator 1. Delta module 1 performs analog-to-digital conversion based on the determination of the sign of the signal increment at its signal input over the period of the clock signal. In this case, a positive increment corresponds to a pulse, and a negative one to the absence of a pulse at the output of the delta modulator.

In the initial state in all bits of the shift register 3 recorded

ABOUT

Delogic output signal

encoder 4 is missing. The clock inputs of the delta modulator 1 and shift register 3 receive tat pulses from the output of generator 2. The frequency of these pulses is determined by the voltage at the control input of the generator 2.

The signal received at the input of the delta modulator 1 is compared with the approximate voltage generated within the delta modulator in the previous clock interval. In accordance with the sign: a comma defined in each increment at the output of the delta modulator 1, a sequence of logical 1 and O is formed, forming the code word of the input signal, which is sequentially entered into the shift register 3 by clock pulses. 4. If a signal of the same form, but with a different amplitude and a different time scale, arrives at the input of the device, the TB amplitude of the signal at the output of amplifier 5 remains unchanged. The voltage at the output of the adder 9 varies, as with a changed time scale of the signal the average value of the spectrum frequency changes and at one of the inputs of the adder 9 a voltage appears that is greater or less than the voltage at the initial time scale of the signal . The frequency of the clock pulses varies in proportion to the change in the duration of the input signal and the ratio of the duration of the input signal

the delta modulator 1 to the period-pulse pulses remains unchanged. The code word entered into the shift register 3 and the signal at the output of the decoder 4 do not change. The device is characterized by increased noise immunity to changes in the amplitude and time scale of the input signal.

Claims (2)

1. USSR author's certificate number 167680, cl. G 05 B 23/00, 1962. ABOUT 2. Copyright certificate of the USSR. Application No. 2582351/21, cl. G 01 R 29/02, 1978 (prototype).