Multi-channel sonic receiver with combined time-gain control and

Details Multi-channel sonic receiver with combined time-gain control and Multi-channel sonic receiver with combined time-gain control and

1982-03-01

1983-03-29

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

73900, 343 5SM, 367900, G01S 1502, G01S 752

Patent

active

043785964

ABSTRACT:
In a receiver for pulsed ultrasonic beams, it is sometimes desirable to translate the received signal to a lower carrier frequency by a heterodyne process. It is also often desirable to vary the receiving channels' gain during the period when signals are being received from a single transmitted pulse, to compensate for the attenuation of later-arriving signals from a greater distance. To get both the heterodyne and the time-gain control functions in a prior-art receiver of N channels requires 2 mixers in each channel, or 2N mixers. According to the invention, the heterodyne and the time-gain control signals are combined in one master mixer and fed to all the channel mixers. The only N+1 mixers are required.

REFERENCES:
patent: 2798949 (1957-07-01), Scholz
patent: 2984741 (1961-05-01), Bronstein et al.
patent: 3987403 (1976-10-01), Smith

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