公开(公告)号：PH12015501694A1

公开(公告)日：2015-10-19

申请号：PH12015501694

申请日：2015-07-31

Applicant: QUALCOMM INC

Inventor： SRINIVASA ATTI VENKATRAMAN ,  VENKATESH KRISHNAN

IPC: G10L21/038 ,  G10L21/0264

Abstract: A particular method includes determining, based on an inter-line spectral pair (LSP) spacing corresponding to an audio signal, that the audio signal includes a component corresponding to an artifact-generating condition. The method also includes, in response to determining that the audio signal includes the component, adjusting a gain parameter corresponding to the audio signal. For example, the gain parameter may be adjusted via gain attenuation and/or gain smoothing.

公开(公告)号：PH12015501516A1

公开(公告)日：2015-09-21

申请号：PH12015501516

申请日：2015-07-03

Applicant: QUALCOMM INC

Inventor： SRINIVASA ATTI VENKATRAMAN ,  VENKATESH KRISHNAN ,  VIVEK RAJENDRAN ,  PIERRE VILLETTE STEPHANE

IPC: G10L19/07 ,  G10L21/0208 ,  G10L19/24 ,  G10L21/0216 ,  G10L21/0388

Abstract: A particular method includes determining, based on spectral information corresponding to an audio signal that includes a low-band portion and a high-band portion, that the audio signal includes a component corresponding to an artifact-generating condition. The method also includes filtering the high-band portion of the audio signal and generating an encoded signal. Generating the encoded signal includes determining gain information based on a ratio of a first energy corresponding to filtered high-band output to a second energy corresponding to the low-band portion to reduce an audible effect of the artifact-generating condition.

公开(公告)号：PH12015501671A1

公开(公告)日：2015-10-19

申请号：PH12015501671

申请日：2015-07-28

Applicant: QUALCOMM INC

Inventor： SRINIVASA ATTI VENKATRAMAN ,  VENKATESH KRISHNAN

IPC: G10L21/038

Abstract: A method includes receiving a first value of a mixing factor. The first value corresponds to a first portion of an audio signal received at an audio encoder. The method includes receiving a second value of the mixing factor. The second value corresponds to a second portion of the audio signal. The method also includes generating a third value of the mixing factor at least partially based on the first value and the second value and mixing an excitation signal with modulated noise based on the third value. Another method includes determining a first set of spectral frequency values corresponding to an audio signal and determining a second set of spectral frequency values that approximates the first set of spectral frequency values. A gain value corresponding to at least a portion of the audio signal is adjusted based on a difference between the first set and the second set.