SU73332A1 - Method for partial compensation of residual non-stationary processes - Google Patents

Description

A method is proposed for partial compensation of non-stationary residual processes arising when receiving acoustic or seismic signals by electro-acoustic or electromechanical devices.

The presence of non-stationary processes prevents an increase in the transmission rate and selectivity of reception. If a certain ratio between the transmission rate and the selectivity of reception is not observed, the distortion of received signals is greater than the separation of 1) Their signals with each other (“signal rush”), which makes it difficult, and the reading makes it impossible to monitor and unscramble.

1l of compensation for residual iestasia niaro-processes it is proposed to wrap the pair from the output of the receiving device through two parallel channels, and then fold differentially. In one of the channels, the shift of the sigial in time is created (the delay time is equal to the most permissible duration of residual unstable ion oscillations) and the output voltage amnlity is set equal to the instantaneous value of the surge, but the receiving output of the other channel after a time equal to the overhead time. Thus, at the output of the system, the signal is received undistorted, and the residual unsteady oscillations, due to the opposite of the phases passing through both voltage channels, are partially compensated for the GOT.

Ma FIG. A schematic diagram of the device is shown, where 1 and 2 are input, and 3 and 4 are output terminals of the device, 5-potentiometer for setting the amplitude ratio and 6-element delay delay, hp. Jungle is a series of links of the low-pass filter, consisting of inductance and capacitance. The addition of oscillations, propagating uiihs to both channels,) | 1 occurs in the second winding of the transformer 7. Low frequency 4) Ilter 6 creates a phase difference between the load vectors at the input and output, but does not introduce phase distortions, since the angle of phase shift is proportional to frequency

FIG. 2 shows a graphical construction explaining the action. A sinusoidal signal whose quadrangle envelope, with a frequency o and duration of T 0.05 s, is received

time constant: -,, 05 sec. (-decrement

receiver attenuation). Consistently with the receiver included compensation circuit.

Curve a depicts a signal at the receiver output, a curve b-on the terminals of the primary winding of a transformer connected to the channel without delay, a curve on the terminals of the primary winding connected to the channel with a delay, a curve on the secondary winding of the transformer.

Thus, a system is obtained, as it were, with varying attenuation; during a signal build-up, the attenuation is small (corresponds to the attenuation of the receiver), when the amplitude decreases (residual transient oscillations), the attenuation instantaneously increases dramatically.

PRE; i mete and z ob 5 etheni

The method of partial compensation of residual unsteady processes arising from the reception of acoustic or seismic signals by electroacoustic and electromechanical equipment, which differs in tsm that the output voltages of these devices fold differentially after passing through two parallel channels, in one of which the signals are shifted in time by several the hundredths of a second and the output voltage altitude value is set to the instantaneous value of the voltage that is received at the output of another channel ithout time equal to the delay time.