Signal processing system comprising a signal source, a signal pr

Details Signal processing system comprising a signal source, a signal pr Signal processing system comprising a signal source, a signal pr

1983-06-23

1985-05-21

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

H03G 330

Patent

active

045189277

ABSTRACT:
A signal processing system comprising a signal source (CAM), a signal processing unit (CPU) and connecting cables (CC1-CC5) having different lengths. A series circuit comprising a switchable signal attenuator (ATT), a low-noise, non-controlled signal amplifier (AMP2) and a AGC-signal amplifier (AMP1) is present to compensate for the variable cable losses. A change-over input (ST) of the signal attenuator (ATT) is coupled to a change-over circuit (ATS) which has a locking input (LT) and a measuring signal input (DT). The measuring signal input (TD) is coupled directly to a signal detection circuit (DET). A second output of the signal detection circuit is coupled to the locking input (LT), through a time signal generator (TSG). After a time delay of several dozen seconds, locking is effected, and the signal attenuator (ATT) can no longer switch-over during the normal signal processing operation and impermissible sudden signal amplitude changes are prevented.

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