Telecommunications – Receiver or analog modulated signal frequency converter – Squelch
Patent
1992-05-22
1994-11-29
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Squelch
455225, 455296, 375 99, 375104, H04B 110
Patent
active
053697910
ABSTRACT:
An apparatus and method for discriminating and suppressing noise within an incoming signal which provide a first signal processing unit for processing the incoming signal to generate a first iteration signal representing average difference signal level of the incoming signal; a second signal processing unit for processing the first iteration signal to generate a second iteration signal representing specified aspects of the first iteration signal; a prediction unit for generating a predicted value for the second iteration signal from earlier samples of the second iteration signal; a logic unit for determining a threshold difference between the second iteration signal and the predicted value, the logic unit generating a logic output having a first value when the threshold difference exceeds a predetermined threshold value and having a second value when the threshold difference does not exceed the predetermined threshold value; and a muting unit for muting signals which is operatively connected to receive the incoming signal and the logic output, the muting unit responds to the logic output to mute the incoming signal when the logic output is at one value and to not mute the incoming signal when the logic output is at the other value.
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Asghar Safdar M.
Bartkowiak John G.
Advanced Micro Devices , Inc.
Urban Edward F.
Wisler Mark D.
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