KR840002179A - Interference controller - Google Patents

Abstract

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Description

Interference controller

As this is a public information case, the full text was not included.

1 is an exemplary diagram of a two-stage echo control arrangement having first and second echo cancellers embodying the present invention. 2 and 3 illustrate exemplary embodiments of the present invention that include a near-end speech detector in a second echo canceller and a "rate of change" control unit that can inhibit the action of the first echo canceller. 4 is a view formed by combining the second and third degrees.

Claims (10)

In an interference controller for substantially canceling an interference signal of a first signal propagating along a transmission signal path of a near-end transmitter / receiver, an interference simulation signal is subtracted from the first signal in operation to generate an interference cancellation signal, and the interference The simulated signal is generated in response to the interference canceled signal and the input signal on the receiving path of the transmitter / receiver, adjustment to the generation of the interference simulated signal is prohibited when the first signal reaches a predetermined level, and the first signal is transmitted to the transmitter. Improvement of OR relationship to the interference controller, characterized in that the pre-interference cancel signal generated in response to the actual return interference signal and the input signal from the receiver. 2. The apparatus of claim 1, further comprising: means for generating an interference cancellation signal by subtracting the interference simulation signal from the first signal; means for generating an interference simulation signal in response to the input signal and the interference cancellation signal; Means for prohibiting adjustment of the first-mentioned response means when the first signal reaches a predetermined level in response to the first signal and means for generating the first signal by subtracting another interference simulation signal from the actual return interference signal; Means for receiving another interference simulation signal in response to the input signal and the first signal. A controller according to claim 2 adapted to receive a digital input signal and to transmit a digital interference cancellation signal, wherein the means for generating an interference simulation signal generates a plurality of N incremental delay sample values of the input signal to produce an interference simulation signal. Responsive to the input signal for synthesizing a plurality of N values as an interference canceling signal, and means for generating another interference simulation signal generate a plurality of M incremental delay sample values of the input signal to generate another interference simulation signal. And responsive to the input signal to combine the plurality of M values with the first signal. 4. The apparatus of claim 3, wherein the prohibiting means is responsive to the input signal to generate a plurality of N incremental delay sample values of the input signal, wherein the first signal is greater than a value that is one half of the maximum sample value of the plurality of N values. And comparing the plurality of N values with the first signal to prohibit the case. A plurality of (N-1) delay elements according to claim 3 or 4, wherein the means for generating the interference simulation signal comprises a plurality of (N-1) delay elements for forming a cross filter responsive to the input signal to generate a plurality of N values of the input signal, respectively. A plurality of N tap weight generators responsive to the interference canceled signal to generate respective ones of the plurality of N tap weight values, and each of the plurality of N sample values and each of the plurality of N tap weight values in response thereto; A plurality of N multipliers for generating respective products of the value, and means for summing the N product values to generate an interference simulation signal; Means for generating another interference simulation signal, each of a plurality of (M-1) delay elements and a plurality of M tap weight values forming a cross filter responsive to the input signal to generate values of the plurality of input signals; A plurality of M tap weight generators respectively responsive to the first signal to generate and a plurality of M multipliers for generating respective products of the respective values in response to each of the plurality of M tap weight values and each of the plurality of M tap weight values, respectively. And means for summing M-values to generate another interference simulation signal. 6. A controller as claimed in claim 2, 3, 4 or 5, comprising means for prohibiting adjustment of the means for generating another interference simulation signal as a predetermined interference cancellation degree. 6. A method as claimed in claim 2, 3, 4 or 5, for performing time differentiation thereon to generate an interference simulation rate and forbidding adjustment of means for generating another interference simulation signal when the simulation rate is less than a predetermined value. And means for responding to another interference simulation signal to compare the simulation rate with a predetermined value. In the controller according to the second, third, fourth or fifth aspect, to generate a plurality of M incremental delay sample values of an input signal, to compare the plurality of values with the first signal, and the first signal is a plurality of such plurality. Means for responsive to the input signal and the first signal to prohibit adjustment of the means for generating another interference simulation signal when the value of the maximum sample value is smaller than a predetermined weighted value. 6. The actual return interference according to claim 2, 3, 4 or 5, in order to prohibit the adjustment of the means for generating another interference simulation signal when the first signal is smaller than the predetermined weighted value of the actual return interference signal. Means for responding to the signal and the first signal. An interference controller as described herein with reference to FIGS. 1, 2 or 4, or 5 to 7 of the accompanying drawings. ※ Note: The disclosure is based on the initial application.