Echo suppression device, echo suppression method, and echo suppression program
AssigneeTranstron Inc.
InventorYuki Satomi
Life of this patent
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Abstract
A non-linear echo is allowed to be suppressed and voice deterioration is allowed to be suppressed. An echo suppression device for suppressing an echo generated by inputting a voice signal output from a speaker to a microphone includes a compressor on a receiving signal path for transmitting a signal of a receiving signal to the speaker. When a double-talk state has been detected, the compressor performs a compression process on a signal greater than a first threshold among the receiving signals.
Claims9
An echo suppression device for suppressing an echo generated by inputting a voice signal output from a speaker to a microphone, the echo suppression device comprising:
- a level adjustment unit provided on a receiving signal path for transmitting a signal of receiving signals from a far-end side to the speaker;
- an echo removal unit provided on a transmitting signal path for transmitting a signal input from the microphone, the echo removal unit removing a residual echo from a picked-up sound signal output from the microphone;
- and
- a double-talk detection unit that detects whether signals are in a double-talk state in which the signals are simultaneously transmitted to the transmitting signal path and the receiving signal path, wherein
- the level adjustment unit includes a compressor, which, when the double-talk detection unit has detected the double-talk state, performs a compression process on a signal greater than a first threshold among the receiving signals.
An echo suppression method for suppressing an echo in a near-end terminal including a speaker and a microphone, the echo suppression method comprising:
- detecting whether signals are in a double-talk state in which the signals are simultaneously transmitted to a transmitting signal path for transmitting a signal input from the microphone and a receiving signal path for transmitting a signal to the speaker;
- performing a compression process on a signal greater than a first threshold among receiving signals from a far-end side when the double-talk state has been detected;
- outputting a signal after the compression process from the speaker;
- and
- removing a residual echo from a picked-up sound signal output from the microphone.
A non-transitory computer readable storage medium having a stored program causing a computer to suppress an echo in a near-end terminal having a speaker and a microphone, the stored program causing the computer to:
- detect whether signals are in a double-talk state in which the signals are simultaneously transmitted to a transmitting signal path for transmitting a signal input from the microphone and a receiving signal path for transmitting a signal to the speaker;
- perform a compression process on a signal greater than a first threshold among receiving signals from a far-end side when the double-talk state has been detected;
- output a signal after the compression process from the speaker;
- and
- remove a residual echo from a picked-up sound signal output from the microphone.
Dependencies are inferred from the claim text.