Method and apparatus for synchronizing highly compressed enhancement layer data
    21.
    发明授权
    Method and apparatus for synchronizing highly compressed enhancement layer data 失效
    用于同步高度压缩的增强层数据的方法和装置

    公开(公告)号:US08462702B2

    公开(公告)日:2013-06-11

    申请号:US12737408

    申请日:2009-07-14

    申请人: Peter Jax Sven Kordon

    发明人: Peter Jax Sven Kordon

    摘要: Multimedia application data formats often use data packets and may contain packetized hierarchical layers with a base layer (BL) and one or more enhancement layers (EL). Packets that comprise variable length coded data typically provide padding bits, which can be used for adding checksum information. The checksum information refers to both, the decoded base layer and decoded enhancement layer packet data, and is used for detecting synchronization loss between the layers. Though the packets provide different individual amounts of padding bits, this variable amount of bits per packet is sufficient for adding check-sum information for synchronization related purposes. This allows e.g. out-of-sync detection even if the enhancement layer encoding provides no overhead information for synchronization, in particular no packet headers and no packet synchronization words.

    摘要翻译: 多媒体应用数据格式通常使用数据分组,并且可以包含具有基本层(BL)和一个或多个增强层(EL)的分组分层。 包含可变长度编码数据的数据包通常提供填充位,可用于添加校验和信息。 校验和信息是指解码的基本层和解码的增强层分组数据,并且用于检测层之间的同步丢失。 虽然分组提供不同的单独填充比特量,但是每个分组的这个可变比特量足以添加用于同步相关目的的校验和信息。 这允许例如 即使增强层编码不提供用于同步的开销信息,特别是没有分组报头,也没有分组同步字,所以不同步检测。

    Method and apparatus for encoding and decoding an audio signal using adaptively switched temporal resolution in the spectral domain
    22.
    发明申请
    Method and apparatus for encoding and decoding an audio signal using adaptively switched temporal resolution in the spectral domain 有权
    在频谱域中使用自适应切换的时间分辨率对音频信号进行编码和解码的方法和装置

    公开(公告)号:US20090012797A1

    公开(公告)日:2009-01-08

    申请号:US12156748

    申请日:2008-06-04

    IPC分类号: G10L19/00

    CPC分类号: G10L19/0212 G10L19/022

    摘要: Perceptual audio codecs make use of filter banks and MDCT in order to achieve a compact representation of the audio signal, by removing redundancy and irrelevancy from the original audio signal. During quasi-stationary parts of the audio signal a high frequency resolution of the filter bank is advantageous in order to achieve a high coding gain, but this high frequency resolution is coupled to a coarse temporal resolution that becomes a problem during transient signal parts by producing audible pre-echo effects. The invention achieves improved coding/decoding quality by applying on top of the output of a first filter bank a second non-uniform filter bank, i.e. a cascaded MDCT. The inventive codec uses switching to an additional extension filter bank (or multi-resolution filter bank) in order to re-group the time-frequency representation during transient or fast changing audio signal sections. By applying a corresponding switching control, pre-echo effects are avoided and a high coding gain and a low coding delay are achieved.

    摘要翻译: 感知音频编解码器通过从原始音频信号中消除冗余和不相关性来利用滤波器​​组和MDCT来实现音频信号的紧凑表示。 在音频信号的准静止部分期间,为了实现高编码增益,滤波器组的高频分辨率是有利的,但是该高频分辨率与通过产生瞬态信号部分期间成为问题的粗略时间分辨率相耦合 声音预回声效果。 本发明通过在第一滤波器组的输出顶部施加第二非均匀滤波器组(即级联MDCT)来实现改进的编码/解码质量。 本发明的编解码器使用切换到附加的扩展滤波器组(或多分辨率滤波器组),以便在瞬变或快速改变的音频信号部分期间重新分组时间 - 频率表示。 通过应用相应的切换控制,避免了前回波效应,实现了高编码增益和低编码延迟。

    Method and Apparatus for Encrypting Encoded Audio Signal
    23.
    发明申请
    Method and Apparatus for Encrypting Encoded Audio Signal 有权
    用于加密编码音频信号的方法和装置

    公开(公告)号:US20090122992A1

    公开(公告)日:2009-05-14

    申请号:US12227192

    申请日:2007-05-03

    IPC分类号: H04L29/06

    摘要: Advanced solutions for encrypting multi-layer audio data are required, ie. audio data that comprise a base layer and one or more enhancement layers. A method for encrypting such an encoded audio signal comprises separating the base layer into two sections, encrypting the side information within frames of the second section of the base layer, and encrypting at least a part of the data of the enhancement layer, wherein the encrypted section of the base layer and the encrypted enhancement layer require different decryption keys for decryption. Thus, free preview zones are possible to implement.

    摘要翻译: 需要用于加密多层音频数据的高级解决方案,即。 包括基础层和一个或多个增强层的音频数据。 一种用于加密这样的编码音频信号的方法,包括将基本层分为两部分,对基本层的第二部分的帧内的边信息进行加密,以及加密增强层的数据的至少一部分,其中加密 基层和加密增强层的一部分需要不同的解密密钥进行解密。 因此,可以实现免费的预览区域。

    Method and apparatus for encrypting encoded audio signal
    24.
    发明授权
    Method and apparatus for encrypting encoded audio signal 有权
    用于加密编码音频信号的方法和装置

    公开(公告)号:US08345870B2

    公开(公告)日:2013-01-01

    申请号:US12227192

    申请日:2007-05-03

    IPC分类号: H04N7/167 H04L29/06

    摘要: Advanced solutions for encrypting multi-layer audio data are required, ie. audio data that comprise a base layer and one or more enhancement layers. A method for encrypting such an encoded audio signal comprises separating the base layer into two sections, encrypting the side information within frames of the second section of the base layer, and encrypting at least a part of the data of the enhancement layer, wherein the encrypted section of the base layer and the encrypted enhancement layer require different decryption keys for decryption. Thus, free preview zones are possible to implement.

    摘要翻译: 需要用于加密多层音频数据的高级解决方案,即。 包括基础层和一个或多个增强层的音频数据。 一种用于加密这样的编码音频信号的方法,包括将基本层分为两部分,对基本层的第二部分的帧内的边信息进行加密,以及加密增强层的数据的至少一部分,其中加密 基层和加密增强层的一部分需要不同的解密密钥进行解密。 因此,可以实现免费的预览区域。

    Method and apparatus for encoding and decoding an audio signal using adaptively switched temporal resolution in the spectral domain
    25.
    发明授权
    Method and apparatus for encoding and decoding an audio signal using adaptively switched temporal resolution in the spectral domain 有权
    在频谱域中使用自适应切换的时间分辨率对音频信号进行编码和解码的方法和装置

    公开(公告)号:US08095359B2

    公开(公告)日:2012-01-10

    申请号:US12156748

    申请日:2008-06-04

    IPC分类号: G10L19/02

    CPC分类号: G10L19/0212 G10L19/022

    摘要: Perceptual audio codecs make use of filter banks and MDCT in order to achieve a compact representation of the audio signal, by removing redundancy and irrelevancy from the original audio signal. During quasi-stationary parts of the audio signal a high frequency resolution of the filter bank is advantageous in order to achieve a high coding gain, but this high frequency resolution is coupled to a coarse temporal resolution that becomes a problem during transient signal parts by producing audible pre-echo effects. The invention achieves improved coding/decoding quality by applying on top of the output of a first filter bank a second non-uniform filter bank, i.e. a cascaded MDCT. The inventive codec uses switching to an additional extension filter bank (or multi-resolution filter bank) in order to re-group the time-frequency representation during transient or fast changing audio signal sections. By applying a corresponding switching control, pre-echo effects are avoided and a high coding gain and a low coding delay are achieved.

    摘要翻译: 感知音频编解码器通过从原始音频信号中消除冗余和不相关性来利用滤波器​​组和MDCT来实现音频信号的紧凑表示。 在音频信号的准静止部分期间,为了实现高编码增益,滤波器组的高频分辨率是有利的,但是该高频分辨率与通过产生瞬态信号部分期间成为问题的粗略时间分辨率相耦合 声音预回声效果。 本发明通过在第一滤波器组的输出顶部施加第二非均匀滤波器组(即级联MDCT)来实现改进的编码/解码质量。 本发明的编解码器使用切换到附加的扩展滤波器组(或多分辨率滤波器组),以便在瞬变或快速改变的音频信号部分期间重新分组时间 - 频率表示。 通过应用相应的切换控制,避免了前回波效应,实现了高编码增益和低编码延迟。