Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1984-07-02
1987-03-10
Krass, Errol A.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
364724, 364574, 358 36, 358340, 375103, 375 14, 381 71, 381 94, H03F 1266, H03K 5159, G06F 738, H04B 320
Patent
active
046495053
ABSTRACT:
A two-input crosstalk-resistant adaptive noise canceller receives a primary input signal including a desired speech signal portion and an undesired noise signal portion and also receives a reference input signal having a reference noise input portion and a crosstalk speech portion. The canceller has first and second summer means and first and second adaptive filter means. The first summer means provides a canceller output signal which is the difference between the primary input signal and the first adaptive filter output signal. The canceller output signal is applied to the reference input of the second adaptive filter and to one of a pair of error-control inputs of the first adaptive filter. The second error-control input of the first adaptive filter is provided by the signal at the output of the second adaptive filter, which receives a single error-control input signal from the output of the second summer means. The second summer provides an output signal which is the difference between the reference input signal and the second adapter filter output signal. With the correlation bias between the desired primary input (speech) signal and the crosstalk (speech) signal in the reference input substantially reduced, the canceller output signal is then related substantially only to the primary input desired signal.
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"Adaptive Noise Cancelling: Principles and Applications" B. Widrow et al., Proc. IEEE, vol. 63, pp. 1692-1716, (Dec. 1975).
Koch Steven R.
Silverstein Seth D.
Zinser, Jr. Richard L.
Davis Jr. James C.
Dixon Joseph L.
General Electric Company
Krass Errol A.
Krauss Geoffrey H.
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