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    High quality detection in FM stereo radio signal
    1.
    发明授权
    High quality detection in FM stereo radio signal 有权
    FM立体声无线电信号中的高质量检测

    公开(公告)号：US09319159B2

    公开(公告)日：2016-04-19

    申请号：US14346946

    申请日：2012-10-01

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Jonas Engdegard ,  Heiko Purnhagen ,  Leif Sehlstrom

    IPC: H04H40/45 ,  G10L25/69 ,  H04B1/16 ,  G10L19/008

    CPC classification number: H04H40/45 ,  G10L19/008 ,  G10L25/69 ,  H04B1/1676

    Abstract: The present document relates to audio signal processing, in particular to an apparatus and a corresponding method for improving an audio signal of an FM stereo radio receiver. In particular, the present document relates to a method and system for reliably detecting the quality of a received FM stereo radio signal and for selecting an appropriate processing based on the detected quality. An apparatus (20) configured to estimate the quality of a received multi-channel FM radio signal is described. The received multi-channel FM radio signal is representable as a mid signal and a side signal, and the side signal is indicative of a difference between a left signal and a right signal. The apparatus (20) comprises a power determination unit configured to determine (101) a power of the mid signal, referred to as mid power, and a power of the side signal, referred to as side power; a ratio determination unit configured to determine (102) a ratio of the mid power and the side power, thereby yielding a mid-to-side ratio; and a quality determination unit configured to determine (105) a quality indicator of the received FM radio signal based at least on the mid-to-side ratio.

    Abstract translation: 本文件涉及音频信号处理，特别涉及用于改进FM立体声无线电接收机的音频信号的装置和相应的方法。 特别地，本文件涉及一种用于可靠地检测接收的FM立体声无线电信号的质量并且基于检测到的质量来选择适当的处理的方法和系统。 描述了被配置为估计所接收的多频道FM无线电信号的质量的装置（20）。 所接收的多声道FM无线电信号可以表示为中间信号和侧信号，并且侧信号表示左信号和右信号之间的差。 设备（20）包括功率确定单元，被配置为确定（101）被称为中间功率的中间信号的功率和被称为侧向功率的侧信号的功率; 比率确定单元，被配置为确定（102）中间功率和侧面功率的比率，从而产生中间到侧面的比率; 以及质量确定单元，被配置为至少基于中间到侧边比率来确定（105）所接收的FM无线电信号的质量指示符。

    Efficient and scalable parametric stereo coding for low bitrate audio coding applications
    3.
    发明授权
    Efficient and scalable parametric stereo coding for low bitrate audio coding applications 有权

    公开(公告)号：US10902859B2

    公开(公告)日：2021-01-26

    申请号：US16744586

    申请日：2020-01-16

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Fredrik Henn ,  Kristofer Kjorling ,  Lars Liljeryd ,  Jonas Roden ,  Jonas Engdegard

    IPC: G10L19/008 ,  G10L19/26 ,  G10L21/038 ,  G10L25/21

    Abstract: The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.

    Audio decoder with core decoder and surround decoder
    4.
    发明授权
    Audio decoder with core decoder and surround decoder 有权

    公开(公告)号：US10271142B2

    公开(公告)日：2019-04-23

    申请号：US15426867

    申请日：2017-02-07

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Heiko Purnhagen ,  Lars Villemoes ,  Jonas Engdegard ,  Jonas Roeden ,  Kristofer Kjoerling

    IPC: H04R5/00 ,  H04S5/00 ,  H04S3/02 ,  G10L19/16 ,  G10L19/032 ,  G10L19/02 ,  G10L19/26 ,  G10L19/008

    Abstract: A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.

    Efficient and scalable parametric stereo coding for low bitrate applications
    6.
    发明授权
    Efficient and scalable parametric stereo coding for low bitrate applications 有权

    公开(公告)号：US09865271B2

    公开(公告)日：2018-01-09

    申请号：US15458143

    申请日：2017-03-14

    Applicant: Dolby International AB

    Inventor： Fredrik Henn ,  Kristofer Kjoerling ,  Lars G. Liljeryd ,  Karl Jonas Roeden ,  Jonas Engdegard

    IPC: G10L19/008 ,  G10L19/26 ,  G10L21/038

    CPC classification number: G10L19/008 ,  G10L19/265 ,  G10L21/038 ,  G10L25/21

    Abstract: The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.

    Audio decoder for audio channel reconstruction
    9.
    发明授权
    Audio decoder for audio channel reconstruction 有权

    公开(公告)号：US10250985B2

    公开(公告)日：2019-04-02

    申请号：US15498389

    申请日：2017-04-26

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Heiko Purnhagen ,  Lars Villemoes ,  Jonas Engdegard ,  Jonas Roeden ,  Kristofer Kjoerling

    IPC: H04R5/00 ,  H04S5/00 ,  H04S3/02 ,  G10L19/16 ,  G10L19/032 ,  G10L19/02 ,  G10L19/008 ,  G10L19/26

    Abstract: A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.

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