Persistence and dynamic threshold based intermittent signal dete

Details Persistence and dynamic threshold based intermittent signal dete Persistence and dynamic threshold based intermittent signal dete

1996-08-06

1999-01-26

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704211, 704215, G10L 302

Patent

active

058647937

ABSTRACT:
A signal detector for detecting the presence of a intermittent signal component in a signal. The signal detector receives each of the signal strength samples during a corresponding iteration, and compares a threshold value with the received signal sample. The signal detector sets a counter to a pre-determined number if the sample compared is greater than the threshold value. The signal detector decrements the persistence counter if a corresponding sample is not greater than the threshold value. If the persistence counter is greater than a trigger value, the detector indicates the presence of a intermittent signal component or otherwise declares the absence of a intermittent signal component. The detector may indicate the presence of a intermittent signal component by a logical value of 1 and the absence by a logical value of 0. The threshold value is composed of two components; the intermittent signal component and the background signal component. Each of the components of the threshold is determined separately by using a tracker and a low pass estimator under a control signal obtained from previous decisions as to whether intermittent signal was present or absent.

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