Adaptive signal receiving method and apparatus

Details Adaptive signal receiving method and apparatus Adaptive signal receiving method and apparatus

H - Electricity

04

M

379/21, 379/64

H04M 3/18 (2006.01) H04Q 1/457 (2006.01)

Patent

CA 1200031

- 22 - ADAPTIVE SIGNAL RECEIVING METHOD AND APPARATUS Abstract A tone receiver suitable for use in a telephone system and which adaptively narrows its amplitude sensitivity range defining valid tone signals on a per call basis in accordance with the amplitude of a first tone signal received on a call. The signal range adaptability improves signal echo rejection and spurious noise talkoff. A preferred embodiment is implemented by a programmed digital signal processor which increases the lower amplitude signal threshold in accordance with the amplitude of the first signal. An alternative embodiment adaptively attenuates the level of incoming signals before signal validation. A further improvement of both embodiments allows further amplitude range narrowing in response to any subsequent signal on a call which has an amplitude greater than that of any preceding signal in the call.

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