公开(公告)号：US20150279384A1

公开(公告)日：2015-10-01

申请号：US14672868

申请日：2015-03-30

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman S. Atti ,  Venkatesh Krishnan

IPC: G10L19/02

CPC classification number: G10L19/08 ,  G10L19/0212 ,  G10L19/24 ,  G10L21/038

Abstract: A method includes receiving, at a vocoder, an audio signal sampled at a first sample rate. The method also includes generating, at a low-band encoder of the vocoder, a low-band excitation signal based on a low-band portion of the audio signal. The method further includes generating a first baseband signal at a high-band encoder of the vocoder. Generating the first baseband signal includes performing a spectral flip operation on a nonlinearly transformed version of the low-band excitation signal. The first baseband signal corresponds to a first sub-band of a high-band portion of the audio signal. The method also includes generating a second baseband signal corresponding to a second sub-band of the high-band portion of the audio signal. The first sub-band is distinct from the second sub-band.

Abstract translation: 一种方法包括在声码器处接收以第一采样率采样的音频信号。 该方法还包括在声码器的低频带编码器处产生基于音频信号的低频带部分的低频带激励信号。 该方法还包括在声码器的高频带编码器处生成第一基带信号。 生成第一基带信号包括对低频带激励信号的非线性变换版本执行频谱翻转操作。 第一基带信号对应于音频信号的高频带部分的第一子带。 该方法还包括产生对应于音频信号的高频带部分的第二子带的第二基带信号。 第一个子带与第二个子带不同。

公开(公告)号：US20150279382A1

公开(公告)日：2015-10-01

申请号：US14671757

申请日：2015-03-27

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman S. Atti ,  Venkatesh Krishnan

IPC: G10L19/02 ,  G10L19/12

CPC classification number: G10L19/02 ,  G10L19/12 ,  G10L19/20 ,  G10L21/038

Abstract: A particular method includes encoding a first frame of an audio signal using a first encoder. The method also includes generating, during encoding of the first frame, a baseband signal that includes content corresponding to a high band portion of the audio signal. The method further includes encoding a second frame of the audio signal using a second encoder, where encoding the second frame includes processing the baseband signal to generate high band parameters associated with the second frame.

Abstract translation: 特定的方法包括使用第一编码器对音频信号的第一帧进行编码。 该方法还包括在编码第一帧期间产生包括对应于音频信号的高频带部分的内容的基带信号。 该方法还包括使用第二编码器对音频信号的第二帧进行编码，其中编码第二帧包括处理基带信号以产生与第二帧相关联的高频带参数。

公开(公告)号：US20150106084A1

公开(公告)日：2015-04-16

申请号：US14509676

申请日：2014-10-08

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman S. Atti ,  Venkatesh Krishnan

IPC: G10L21/0216

CPC classification number: G10L21/0216 ,  G10L19/0208 ,  G10L19/087 ,  G10L21/038 ,  G10L25/78

Abstract: A method includes generating a high-band residual signal based on a high-band portion of an audio signal. The method also includes generating a harmonically extended signal at least partially based on a low-band portion of the audio signal. The method further includes determining a mixing factor based on the high-band residual signal, the harmonically extended signal, and modulated noise. The modulated noise is at least partially based on the harmonically extended signal and white noise.

Abstract translation: 一种方法包括基于音频信号的高频带部分生成高频残留信号。 该方法还包括至少部分地基于音频信号的低频带部分产生谐波扩展的信号。 该方法还包括基于高频带残留信号，谐波扩展信号和调制噪声来确定混合因子。 调制噪声至少部分地基于谐波扩展的信号和白噪声。

公开(公告)号：US20140214413A1

公开(公告)日：2014-07-31

申请号：US14026765

申请日：2013-09-13

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman S. Atti ,  Vivek Rajendran ,  Venkatesh Krishnan

IPC: G10L19/26

CPC classification number: G10L19/265 ,  G10L19/06 ,  G10L19/09 ,  G10L19/26 ,  G10L21/0216 ,  G10L2019/0011 ,  G10L2021/02168

Abstract: A method of processing an audio signal includes determining an average signal-to-noise ratio for the audio signal over time. The method includes, based on the determined average signal-to-noise ratio, a formant-sharpening factor is determined. The method also includes applying a filter that is based on the determined formant-sharpening factor to a codebook vector that is based on information from the audio signal.

Abstract translation: 处理音频信号的方法包括确定音频信号随时间的平均信噪比。 该方法包括基于确定的平均信噪比，确定共振峰 - 锐化因子。 该方法还包括将基于所确定的共振峰 - 锐化因子的滤波器应用于基于来自音频信号的信息的码本矢量。

公开(公告)号：US20130185084A1

公开(公告)日：2013-07-18

申请号：US13719701

申请日：2012-12-19

Applicant: Qualcomm Incorporated

Inventor： Vivek Rajendran ,  Venkatesh Krishnan ,  Daniel J. Sinder

IPC: G10L19/008

CPC classification number: G10L19/04 ,  G10L19/005 ,  G10L19/008 ,  G10L19/09 ,  G10L19/107 ,  H04L1/0009 ,  H04L1/0014 ,  H04L1/007 ,  H04L1/08

Abstract: Compressibility-based reallocation of initial bit allocations for frames of an audio signal is described. Applications to redundancy-based retransmission of critical frames (e.g., for fixed-bit-rate modes of speech codec operation) are also described.

Abstract translation: 描述了对音频信号的帧的初始位分配的基于压缩性的重新分配。 还描述了用于关键帧冗余重传（例如，对于固定比特率模式的语音编解码器操作）的应用。

公开(公告)号：US20180268839A1

公开(公告)日：2018-09-20

申请号：US15987840

申请日：2018-05-23

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman Atti ,  Venkatesh Krishnan

IPC: G10L21/0216 ,  G10L21/038 ,  G10L19/02 ,  G10L19/087 ,  G10L25/78

CPC classification number: G10L21/0216 ,  G10L19/0208 ,  G10L19/087 ,  G10L21/0208 ,  G10L21/038 ,  G10L25/78

Abstract: A method includes generating a high-band residual signal based on a high-band portion of an audio signal. The method also includes generating a harmonically extended signal at least partially based on a low-band portion of the audio signal. The method further includes determining a mixing factor based on the high-band residual signal, the harmonically extended signal, and modulated noise. The modulated noise is at least partially based on the harmonically extended signal and white noise.

公开(公告)号：US09984699B2

公开(公告)日：2018-05-29

申请号：US14750784

申请日：2015-06-25

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman S. Atti ,  Venkatesh Krishnan

IPC: G10L19/26 ,  G10L19/04 ,  G10L21/038

CPC classification number: G10L19/265 ,  G10L19/04 ,  G10L21/038

Abstract: A method includes generating a first signal corresponding to a first component of a high-band portion of an audio signal. The first component has a first frequency range. The method includes generating a high-band excitation signal corresponding to a second component of the high-band portion of the audio signal. The second component has a second frequency range differs from the first frequency range. The high-band excitation signal is provided to a filter having filter coefficients generated based on the first signal to generate a synthesized version of the high-band portion of the audio signal.

公开(公告)号：US09899032B2

公开(公告)日：2018-02-20

申请号：US15422856

申请日：2017-02-02

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman Atti ,  Venkatesh Krishnan

IPC: G10L19/16 ,  G10L19/06 ,  G10L19/035 ,  H03G3/30 ,  G10L19/00

CPC classification number: G10L19/167 ,  G10L19/032 ,  G10L19/035 ,  G10L19/06 ,  G10L21/038 ,  G10L2019/0003 ,  H03G3/301 ,  H03G3/3089

Abstract: A method of performing gain adjustment in an electronic device includes determining a first set of spectral frequency values and determining a second set of spectral frequency values. The first set of spectral frequency values corresponds to a high-band portion of an audio signal received at the electronic device. The second set of spectral frequency values approximates the first set of spectral frequency values in the high band portion of the audio signal. The method includes estimating a spectral distortion corresponding to a difference between the first set of spectral frequency values and the second set of spectral frequency values and adjusting, based on the spectral distortion, a gain value corresponding to at least a portion of the audio signal. The method also includes transmitting an encoded bitstream that includes information corresponding to the adjusted gain value and the second set of spectral frequency values.

公开(公告)号：US20170301364A1

公开(公告)日：2017-10-19

申请号：US15636501

申请日：2017-06-28

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman ATTI ,  Vivek Rajendran ,  Venkatesh Krishnan

IPC: G10L19/26 ,  G10L19/06 ,  G10L21/0216 ,  G10L19/09 ,  G10L19/00

CPC classification number: G10L19/265 ,  G10L19/06 ,  G10L19/09 ,  G10L19/26 ,  G10L21/0216 ,  G10L2019/0011 ,  G10L2021/02168

Abstract: An apparatus includes a first calculator configured to determine a long-term noise estimate of the audio signal. The apparatus also includes a second calculator configured to determine a formant-sharpening factor based on the determined long-term noise estimate. The apparatus includes a filter configured to filter a codebook vector to generate a filtered codebook vector. The filter is based on the determined formant-sharpening factor, and the codebook vector is based on information from the audio signal. The apparatus further includes an audio coder configured to generate a formant-sharpened low-band excitation signal based on the filtered codebook vector.

公开(公告)号：US09762355B2

公开(公告)日：2017-09-12

申请号：US14809098

申请日：2015-07-24

Applicant: QUALCOMM Incorporated

Inventor： Venkatesh Krishnan ,  Vivek Rajendran ,  Sandip Sarkar ,  Subasingha Shaminda Subasingha ,  Venkatraman S. Atti

IPC: H03M13/00 ,  H04L1/08 ,  H04L1/00 ,  H04L1/18

CPC classification number: H04L1/08 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/008 ,  H04L1/1812 ,  H04L1/1835

Abstract: A device includes a receiver, a buffer, a transmitter, and an analyzer. The receiver is configured to receive a plurality of packets that corresponds to at least a subset of a sequence of packets. Error correction data of a first packet of the plurality of packets includes a partial copy of a second packet of the plurality of packets. The analyzer is configured to determine whether a particular packet of the sequence is missing from the buffer, and to determine whether a partial copy of the particular packet is stored in the buffer. The analyzer is also configured to send, via the transmitter, a retransmit message to a second device based at least in part on determining that the buffer does not store the particular packet and that the buffer does not store the partial copy of the particular packet.