Telephone echo canceller

Details Telephone echo canceller Telephone echo canceller

2007-08-21

2007-08-21

Singh, Ramnandan (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406080

Reexamination Certificate

active

10541417

ABSTRACT:
The invention relates to an echo canceling device and method for an arrangement for transmitting audio signals, in particular uttered speech with an echo filter for canceling echo. The echo filter is arranged between an input channel (1) and an output channel (4). The input channel (1) leads a first electrical input signal to a converter (2) for converting the electrical signal into a first audio signal. The output channel (4) transmits an electrical signal from a converter (3) which converts a second audio signal back into an electrical signal. In order to prevent non-linearly distorted echo in such an echo canceling device or method, a high-pass filter (8) is arranged in the input channel (1) which high-pass filter (8) has a cut-off frequency that is beyond the cut-off frequency of the high-pass behavior in the converter (2). The high-pass filter (8) is followed by a limiting element (9) which limits the amplitude of the input signal to the input range of the converter (2). By this means, non-linear behavior in the converter (2) is prevented so that non-linearly distorted echo cannot arise at all.

REFERENCES:
patent: 3781720 (1973-12-01), Mueller
patent: 5600714 (1997-02-01), Eppler et al.
patent: 5636323 (1997-06-01), Umemoto et al.
patent: 6282176 (2001-08-01), Hemkumar
patent: 7020278 (2006-03-01), Farrell et al.
patent: 2002/0154761 (2002-10-01), McLaughlin et al.
patent: WO 00/70853 (2000-11-01), None
patent: WO/00/70853 (2000-11-01), None
patent: WO 0070853 (2000-11-01), None

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