公开(公告)号：US20190052959A1

公开(公告)日：2019-02-14

申请号：US15761448

申请日：2016-09-19

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Cornelis Pieter JANSE ,  Leonardus Cornelis Antonius VAN STUIVENBERG

IPC分类号： H04R3/04 ,  G10L21/0232 ,  G10L21/038

摘要： An audio signal processing apparatus comprises a receiver (403) receiving an audio signal sampled at a first sampling frequency, the audio signal having a maximum frequency below half the first sampling frequency by a first frequency margin. A tilter bank (405) generates subband signals for the digital audio signal using overlapping sub-filters. A first frequency shifter (407) applies a frequency shift to at least one subband of the set of subbands and a decimator (409) decimates the subband signals by a N decimation factor resulting in a decimated sampling frequency being at least twice a bandwidth of each of the overlapping sub-filters. The frequency shift for a subband is arranged to shift the subband to a frequency interval being a multiple of a frequency interval from zero to half the decimated sample frequency. The subband may be individually processed and the processed subbands may subsequently be combined to generate a full band output signal.

公开(公告)号：US20180122399A1

公开(公告)日：2018-05-03

申请号：US15120130

申请日：2015-03-02

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Cornelis Pieternella JANSE ,  Leonardus Cornelis Antonius VAN STUIVENBERG ,  Patrick KECHICHIAN

IPC分类号： G10L21/0232 ,  G10L21/04 ,  G10L25/18 ,  H04R3/00

CPC分类号： G10L21/0232 ,  G10L21/0208 ,  G10L21/04 ,  G10L25/18 ,  G10L2021/02087 ,  G10L2021/02165 ,  G10L2021/02166 ,  H04R3/005

摘要： A noise suppressor comprises a first (401) and a second transformer (403) for generating a first and second frequency domain signal from a frequency transform of a first and second microphone signal. A gain unit (405, 407, 409) determines time frequency tile gains in response to a difference measure for magnitude time frequency tile values of the first frequency domain signal and magnitude time frequency tile values of the second frequency domain signal. A scaler (411) generates a third frequency domain signal by scaling time frequency tile values of the first frequency domain signal by the time frequency tile gains; and the resulting signal is converted to the time domain by a third transformer (413). A designator (405, 407, 415) designates time frequency tiles of the first frequency domain signal as speech tiles or noise tiles; and the gain unit (409) determines the gains in response to the designation of the time frequency tiles as speech tiles or noise tiles.