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    Sistemas y procedimientos de realización de filtrado para determinación de ganancia
    132.
    发明专利
    Sistemas y procedimientos de realización de filtrado para determinación de ganancia 未知

    公开(公告)号：ES2715847T3

    公开(公告)日：2019-06-06

    申请号：ES13753450

    申请日：2013-08-06

    Applicant: QUALCOMM INC

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

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

    Abstract: Un procedimiento que comprende: determinar, basándose en información espectral correspondiente a una señal de audio que incluye una parte de banda baja y una parte de banda alta, que la señal de audio incluye un componente correspondiente a una condición de generación de artefactos; filtrar la parte de banda alta de la señal de audio para generar una salida de banda alta filtrada basándose en una separación entre pares espectrales interlineal (LSP) asociada con la parte de banda alta de la señal de audio; y generar una señal codificada, en el que generar la señal codificada incluye determinar información de ganancia basándose en una relación de una primera energía correspondiente a la salida de banda alta filtrada a una segunda energía correspondiente a una señal de banda alta sintetizada generada basándose en la parte de banda baja y una señal de ruido modulado o la parte de banda baja para reducir un efecto audible de la condición de generación de artefactos.

    SYSTEM AND METHOD OF REDUNDANCY BASED PACKET TRANSMISSION ERROR RECOVERY
    135.
    发明专利
    SYSTEM AND METHOD OF REDUNDANCY BASED PACKET TRANSMISSION ERROR RECOVERY 未知

    公开(公告)号：CA2953604C

    公开(公告)日：2018-11-13

    申请号：CA2953604

    申请日：2015-07-27

    Applicant: QUALCOMM INC

    Inventor： KRISHNAN VENKATESH ,  RAJENDRAN VIVEK ,  SARKAR SANDIP ,  SUBASINGHA SUBASINGHA SHAMINDA ,  ATTI VENKATRAMAN S

    IPC: H04L1/18 ,  H04L1/00

    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.

    Method, apparatus, device, computer-readable medium for bandwidth extension of an audio signal using a scaled high-band excitation
    136.
    发明专利
    Method, apparatus, device, computer-readable medium for bandwidth extension of an audio signal using a scaled high-band excitation 未知

    公开(公告)号：NZ717786A

    公开(公告)日：2018-05-25

    申请号：NZ71778614

    申请日：2014-10-14

    Applicant: QUALCOMM INC

    Inventor： RAJENDRAN VIVEK ,  VILLETTE STEPHANE ,  ATTI VENKATRAMAN S ,  KRISHNAN VENKATESH

    IPC: G10L21/038 ,  G10L19/083

    Abstract: A method includes determining a first modeled high-band signal based on a low-band excitation signal of an audio signal, where the audio signal includes a high-band portion and a low-band portion. The method also includes determining scaling factors based on energy of sub-frames of the first modeled high-band signal and energy of corresponding sub-frames of the higher band portion of the audio signal. The method includes applying the scaling factors to a modeled high-band excitation signal to determine a scaled high-band excitation signal and determining a second modeled high band signal based on the scaled high-band citation signal. The method includes determining gain parameters based on the second modeled high-band signal and the high-band portion of the audio signal. At least one of the disclosed methods may reduce a dynamic range of gain information provided to an encoder by scaling a modeled high-band excitation signal that is used to calculate the gain information. Scaling the modeled high-band excitation signal in this manner may capture variations in the temporal characteristics from sub-frame-to-subframe and reduce dependence of the gain shape information on temporal changes in the high-band portion of an audio signal.

    Harmonic bandwidth extension of audio signals
    138.
    发明专利
    Harmonic bandwidth extension of audio signals 未知

    公开(公告)号：NZ721890A

    公开(公告)日：2018-02-23

    申请号：NZ72189015

    申请日：2015-02-10

    Applicant: QUALCOMM INC

    Inventor： RAJENDRAN VIVEK ,  SUBASINGHA SUBASINGHA SHAMINDA ,  ATTI VENKATRAMAN S ,  KRISHNAN VENKATESH

    IPC: G10L19/02 ,  G10L21/038 ,  G10L21/0272 ,  G10L25/81

    Abstract: The present application relates to super wideband coding techniques to improve the quality of a synthesized high-band portion of an audio signal. This is achieved by synthesizing a high-band portion using a non-linear function selected from multiple available non-linear processing functions based on audio characteristics of a low-band portion. An adjustment parameter is also calculated based on the first extended signal, the high-band signal, or both. The selected non-linear function may improve the correlation between a high-band portion of an input signal at an encoder and the synthesized high-band portion of the output signal at the decoder in both speech and non-speech (e.g., music) situations.

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