公开(公告)号：EP3796313A1

公开(公告)日：2021-03-24

申请号：EP19803036.3

申请日：2019-05-07

申请人： Transtron Inc.

发明人： SATOMI Yuki

IPC分类号： G10L19/028 ,  G10L21/0208

摘要： There is provided an echo suppression device that allows adding a natural comfort noise even in an environment in which a change in ambient noise is large. An echo is removed from an input signal to generate an echo-removed signal, a noise signal included in the echo-removed signal is estimated to generate an estimated noise signal, and a noise signal included in the echo-removed signal is suppressed based on the estimated noise signal to generate a suppressed signal. A comfort noise is generated based on the estimated noise signal, and the comfort noise is superimposed on the suppressed signal.

公开(公告)号：EP3809601A1

公开(公告)日：2021-04-21

申请号：EP19818729.6

申请日：2019-06-05

申请人： Transtron Inc.

发明人： SATOMI Yuki

IPC分类号： H04B3/23 ,  H04M1/60

摘要： An echo is allowed to be effectively removed while a processing load on an arithmetic device is reduced. When a magnitude of a reference signal transmitted to a speaker is equal to or greater than a first threshold, a learning algorithm using nonlinear processing is selected. When the magnitude of the reference signal is smaller than the first threshold, a learning algorithm using linear processing is selected. The echo is learnt using the selected learning algorithm to remove an echo included in an input signal picked up by a microphone based on a learning result.

公开(公告)号：EP3633865A1

公开(公告)日：2020-04-08

申请号：EP18810819.5

申请日：2018-05-15

申请人： Transtron Inc.

发明人： SATOMI Yuki

IPC分类号： H04B3/20 ,  H04M1/60 ,  H04R3/02

摘要： A double-talk state can be accurately detected, and based on a detection result, echo can be appropriately suppressed. When a sound is output from a speaker and only the output sound is input to a microphone, a comparison is made, for each of different frequency bands, between a frequency mask generated based on a power spectrum or an amplitude spectrum for a learning signal transmitted through a transmitting signal path and a value of a power spectrum or an amplitude spectrum for an input signal input from the microphone, to detect whether there is a double-talk state. In a case of detecting that no signal is being transmitted through the transmitting signal path and that a signal is being transmitted through the receiving signal path, an echo suppressor is used to execute processing of suppressing an echo in the input signal.