公开(公告)号：US10230411B2

公开(公告)日：2019-03-12

申请号：US15127469

申请日：2014-04-30

Applicant: MOTOROLA SOLUTIONS, INC

Inventor： Jian Han ,  Charles H Carter ,  Jesus F Corretjer ,  Meng-Ge Duan ,  Yi Gao ,  Cheah Heng Tan

IPC: H04B1/10 ,  G10L21/0364 ,  H04M9/08 ,  G10L21/02 ,  G10L25/21 ,  G10L25/78 ,  H04B1/00

Abstract: A method and apparatus for distinguishing voice signals that are played together over the same speaker employs spectral reshaping of one or more of the audio signals. The spectral reshaping shifts modifies the timber of the voice signal while not modifying the pitch of the voice signal. Additional techniques can be used to further distinguish voice signals, such as dynamic gain offset and frequency shifting. After processing one or more signals to spectrally reshape them, they can be played over the same speaker. A user hearing the resulting acoustic signal will be more able to distinguish between the multiple voice signals being played.

公开(公告)号：US10127916B2

公开(公告)日：2018-11-13

申请号：US15127422

申请日：2014-04-24

Applicant: MOTOROLA SOLUTIONS, INC

Inventor： Yi Gao ,  Qing Yan

IPC: G10L19/06 ,  G10L19/26 ,  G10L19/00 ,  G10L25/87 ,  G10L19/16 ,  G10L19/02 ,  G10L25/75 ,  G10L21/02

Abstract: A method and apparatus for enhancing audio processing between a transmit radio (230) and a receive radio (240) are provided. Digitized audio frames (202) are applied to parallel inputs of both a vocoder encoder (204) and a trill encoder 212 of the transmit radio (230). The vocoder encoder (204) generates voice bits which are communicated over a voice bits channel (206) to a vocoder decoder (208) of the receive radio (240). Trill encoder (212) generates signaling bits which are communicated over a signaling bits channel (214) to a trill decoder (216) of the receive radio (240) for recovery of trill information (218). At the receive radio (240), a decoded audio signal (209) generated from the vocoder decoder (208), and the recovered trill information (218) are both provided as inputs to a trill reconstructor stage (220) to generate a recovered audio signal (222) having a reconstructed trill.

公开(公告)号：US09749021B2

公开(公告)日：2017-08-29

申请号：US14653776

申请日：2012-12-18

Applicant: MOTOROLA SOLUTIONS, INC

Inventor： Yi Gao ,  Lu-Ming Chen ,  William M Kushner ,  Yu Liu ,  Li Xiao

IPC: H04B7/015 ,  G10L21/0208 ,  G10L21/0232 ,  H04M9/08

CPC classification number: H04B7/015 ,  G10L21/0208 ,  G10L21/0232 ,  G10L2021/02082 ,  H04M9/082

Abstract: Embodiments of an acoustic feedback suppressor determine the energy in each of a plurality of frequency bands of frames of an audio signal. The energy in each of the plurality of frequency bands is compared to characteristic of human voice to determine that a present frame contains content that is not likely human voice and exhibits a characteristic of feedback. Upon determining that feedback is occurring, an adaptive gain reduction is applied to the band in which feedback is suspected to be occurring.