RU2021129719A - ECHO CANCELING DEVICE, ECHO CANCELING METHOD AND ECHO CANCELING PROGRAM - Google Patents

Claims (27)

1. An echo cancellation device for suppressing the echo generated when an output voice signal arrives from a speaker into a microphone, comprising: a level control unit provided in the received signal path for transmitting the received signal from the far end to the speaker; an echo removal unit provided in the transmission path for transmitting a signal input from the microphone, the echo removal unit removing residual echo from the captured audio signal output from the microphone; And a double talk detection unit that determines whether the signals are in a double talk state, in which the signals are simultaneously transmitted to the transmitted signal path and to the received signal path, wherein the level adjusting unit includes a compressor that performs a compression process on a signal exceeding a first threshold among the received signals if the double talk detection unit detects a double talk state. 2. The echo cancellation device according to claim 1, wherein if the double talk detection unit does not determine the double talk state, the compressor performs a compression process on the signal exceeding the second threshold, which exceeds the first threshold, among the received signals. 3. An echo cancellation device according to claim 1 or 2, wherein the level adjuster includes a gain adjuster that adjusts the gain of the received signal, and the compressor adjusts the threshold such that the first threshold becomes small as the gain increases, and the compressor performs a compression process on the output signal from the gain adjuster. 4. The echo cancellation device according to claim 3, wherein the compressor increases the compression ratio as the gain increases. 5. The echo cancellation device according to any one of paragraphs. 1-3, in which the compressor changes the compression ratio based on the speaker distortion information. 6. The echo cancellation device according to any one of paragraphs. 1-5, further comprising: an echo canceller that performs a process for canceling an echo in a signal from which the residual echo has been removed by the echo canceller. 7. The echo cancellation device according to any one of paragraphs. 1-6, in which the compressor compares the value of the received signal with the third threshold for each frequency band, and if the double talk detection unit determines the double talk state, the compressor performs a compression process for the received signal with a value greater than the third threshold. 8. An echo cancellation method for echo cancellation in a near end terminal containing a speaker and a microphone, comprising: determining whether the signals are in a double talk state, wherein the signals are simultaneously transmitted to a transmit signal path for transmitting an input signal from a microphone and to a received signal path for transmitting a signal to a speaker; performing a compression process on a signal exceeding the first threshold among the received signals from the far end when determining the double talk state; outputting the signal after the compression process from the speaker; And removing residual echo from the captured sound output from the microphone. 9. Removable media that stores an echo cancellation program to suppress echo in a near-end terminal containing a speaker and a microphone, the echo cancellation program causing the computer to function as: a double talk detection unit that detects whether the signals are in a double talk state in which signals are simultaneously transmitted to a transmission signal path for transmitting a signal input from a microphone and to a received signal path for transmitting a signal to a speaker; a compressor that performs a compression process on a signal exceeding the first threshold among the received signals from the far end when determining the double talk state; And an echo removal unit that removes the residual echo from the captured audio signal output from the microphone.