Digital single-frequency tone detection in presence of aliases

Details Digital single-frequency tone detection in presence of aliases Digital single-frequency tone detection in presence of aliases

1996-07-25

1999-06-08

Sheikh, Ayaz R.

Boots, shoes, and leggings

379372, G06F 738

Patent

active

059109068

ABSTRACT:
The invention is a method for performing tone detection on a digital signal processor (DSP) that may be used in the presence of tone aliases caused by inadequate anti-aliasing filtering. The method involves processing an input signal at different sampling rates, and can be used with any tone detection algorithm. A tone is detected when it is present at each of the sampling rates. The method allows tone detection to be performed without the use of a proper anti-aliasing filter.

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