초록 ▼

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

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.

대표청구항 ▼

An adaptive noise canceller, comprising: first means for receiving a primary signal having a first desired portion and a second undesired noise portion; second means for receiving, during each of a successive sequence of time intervals (n); a reference signal (r(n)) having a first crosstalk portion

An adaptive noise canceller, comprising: first means for receiving a primary signal having a first desired portion and a second undesired noise portion; second means for receiving, during each of a successive sequence of time intervals (n); a reference signal (r(n)) having a first crosstalk portion with a time-amplitude characteristic similar to that of said primary signal first portion and a second noise portion with a time-amplitude characteristic similar to that of said primary signal second portion; first summer means for subtracting from said primary signal, received from said first means, a noise reference signal (w(n)) to provide an output signal (S(n)) having said primary signal first portion and a second undesirable noise portion which is of reduced amplitude with respect to the amplitude of the primary signal second portion; first adaptive filter means having a reference input receiving said reference signal (r(n)) from said second means, a first error-control input receiving said output signal (S(n)), and a second error-control input receiving an estimation signal (S1(n)), for providing said noise reference signal (w(n)) responsive to a predetermined response pattern dependent upon the conditions of all of said signals then present at said reference input, said first error-control input and said second error-control input; second adaptive filter means having a reference input receiving said output signal (S(n)) and a single error-control input receiving an auxiliary signal (w1(n)) for providing said estimation signal (S1(n)) to said first adaptive filter means second error-control input; and second summer means for subtracting said estimation signal (S1(n)) from said reference signal (r(n)) to provide said auxiliary signal (W1(n)) to said second adapter filter means signal error-control input.