Multi-mode audio codec and CELP coding adapted therefore
    22.
    发明授权
    Multi-mode audio codec and CELP coding adapted therefore 有权
    因此,改变了多模式音频编解码器和CELP编码

    公开(公告)号:US08744843B2

    公开(公告)日:2014-06-03

    申请号:US13449890

    申请日:2012-04-18

    IPC分类号: G10L21/00 G10L19/00

    摘要: In an embodiment, bitstream elements of sub-frames are encoded differentially to a global gain value so that a change of the global gain value results in an adjustment of an output level of the decoded representation of the audio content. Concurrently, the differential coding saves bits. Even further, the differential coding enables the lowering of the burden of globally adjusting the gain of an encoded bitstream. In another embodiment, a global gain control across CELP coded frames and transform coded frames is achieved by co-controlling the gain of the codebook excitation of the CELP codec, along with a level of the transform or inverse transform of the transform coded frames. In another embodiment, the gain value determination in CELP coding is performed in the weighted domain of the excitation signal.

    摘要翻译: 在一个实施例中,子帧的比特流元素被差分地编码为全局增益值,使得全局增益值的改变导致音频内容的解码表示的输出电平的调整。 同时,差分编码保存位。 此外,差分编码能够降低全局调整编码比特流的增益的负担。 在另一个实施例中,跨CELP编码帧和变换编码帧的全局增益控制与CELP编解码器的码本激励的增益以及变换编码帧的变换或逆变换的级别一起共同实现。 在另一实施例中,在激励信号的加权域中执行CELP编码中的增益值确定。

    Audio encoder, audio decoder and audio processor having a dynamically variable warping characteristic
    23.
    发明授权
    Audio encoder, audio decoder and audio processor having a dynamically variable warping characteristic 有权
    具有动态可变翘曲特性的音频编码器,音频解码器和音频处理器

    公开(公告)号:US08682652B2

    公开(公告)日:2014-03-25

    申请号:US12305936

    申请日:2007-05-16

    IPC分类号: G10L19/00

    CPC分类号: G10L19/22 G10L19/022

    摘要: An audio encoder, an audio decoder or an audio processor includes a filter for generating a filtered audio signal, the filter having a variable warping characteristic, the characteristic being controllable in response to a time-varying control signal, the control signal indicating a small or no warping characteristic or a comparatively high warping characteristic. Furthermore, a controller is connected for providing the time-varying control signal, which depends on the audio signal. The filtered audio signal can be introduced to an encoding processor having different encoding algorithms, one of which is a coding algorithm adapted to a specific signal pattern. Alternatively, the filter is a post-filter receiving a decoded audio signal.

    摘要翻译: 音频编码器,音频解码器或音频处理器包括用于产生经滤波的音频信号的滤波器,该滤波器具有可变的翘曲特性,该特性可响应于时变控制信号而被控制,该控制信号指示小的或 无翘曲特性或较高翘曲特性。 此外,连接控制器以提供取决于音频信号的时变控制信号。 滤波后的音频信号可以被引入到具有不同编码算法的编码处理器中,其中之一是适用于特定信号模式的编码算法。 或者,滤波器是接收经解码的音频信号的后置滤波器。

    Apparatus and a method for decoding an encoded audio signal
    25.
    发明授权
    Apparatus and a method for decoding an encoded audio signal 有权
    用于解码编码音频信号的装置和方法

    公开(公告)号:US08275626B2

    公开(公告)日:2012-09-25

    申请号:US13004272

    申请日:2011-01-11

    IPC分类号: G10L19/00

    摘要: An apparatus for decoding an encoded audio signal having first and second portions encoded in accordance with first and second encoding algorithms, respectively, BWE parameters for the first and second portions and a coding mode information indicating a first or a second decoding algorithm, includes first and second decoders, a BWE module and a controller. The decoders decode portions in accordance with decoding algorithms for time portions of the encoded signal to obtain decoded signals. The BWE module has a controllable crossover frequency and is configured for performing a bandwidth extension algorithm using the first decoded signal and the BWE parameters for the first portion, and for performing a bandwidth extension algorithm using the second decoded signal and the bandwidth extension parameter for the second portion. The controller controls the crossover frequency for the BWE module in accordance with the coding mode information.

    摘要翻译: 一种用于解码具有根据第一和第二编码算法编码的第一和第二部分的编码音频信号的装置,分别用于第一和第二部分的BWE参数和指示第一或第二解码算法的编码模式信息包括第一和第二编码算法 第二解码器,BWE模块和控制器。 解码器根据编码信号的时间部分的解码算法来解码部分,以获得解码信号。 BWE模块具有可控的交叉频率,并且被配置为使用第一解码信号和第一部分的BWE参数来执行带宽扩展算法,并且用于使用第二解码信号和带宽扩展参数来执行带宽扩展算法 第二部分。 控制器根据编码模式信息控制BWE模块的交叉频率。

    Method for creating a representation of a calculation result linearly dependent upon a square of a value
    26.
    发明授权
    Method for creating a representation of a calculation result linearly dependent upon a square of a value 有权
    用于根据值的平方线性地创建计算结果的表示的方法

    公开(公告)号:US08037114B2

    公开(公告)日:2011-10-11

    申请号:US11762690

    申请日:2007-06-13

    IPC分类号: G06F15/00

    摘要: In the transition into the logarithmic range, not the entire bit width of the result linearly dependent upon the square of the value must be considered. Rather, it is possible to scale the result of a value with x bits such that a representation with less than x bits of the result is sufficient to receive the logarithmic representation based thereon. The effect of the scaling factor on the resulting logarithmic representation may be compensated for by adding or subtracting a correction value received by the logarithm function applied to the scaling factor to or from the scaled logarithmic representation without any loss of dynamics. This way, a method and an apparatus for creating a representation of a result linearly dependent upon a square of a value are provided so that the calculation is simple and/or possible with little hardware expenditure.

    摘要翻译: 在向对数范围的转换中,必须考虑线性依赖于该值平方的结果的整数位宽度。 相反,可以用x比特来缩放值的结果,使得具有小于x位的结果的表示足以基于此来接收对数表示。 缩放因子对所得到的对数表示的影响可以通过将由应用于比例因子的对数函数接收的校正值加到或从缩放的对数表示中减去而没有任何动态损失来补偿。 这样,提供了一种用于创建线性表示的方法和装置,该结果线性地取决于值的平方,使得在少量硬件消耗的情况下计算是简单的和/或可能的。

    Analysis filterbank, synthesis filterbank, encoder, de-coder, mixer and conferencing system
    27.
    发明授权
    Analysis filterbank, synthesis filterbank, encoder, de-coder, mixer and conferencing system 有权
    分析滤波器组,合成滤波器组,编码器,解码器,混频器和会议系统

    公开(公告)号:US08036903B2

    公开(公告)日:2011-10-11

    申请号:US11744641

    申请日:2007-05-04

    IPC分类号: G10L19/00 G10L19/14

    摘要: An embodiment of an analysis filterbank for filtering a plurality of time domain input frames, wherein an input frame comprises a number of ordered input samples, comprises a windower configured to generate a plurality of windowed frames, wherein a windowed frame comprises a plurality of windowed samples, wherein the windower is configured to process the plurality of input frames in an overlapping manner using a sample advance value, wherein the sample advance value is less than the number of ordered input samples of an input frame divided by two, and a time/frequency converter configured to provide an output frame comprising a number of output values, wherein an output frame is a spectral representation of a windowed frame.

    摘要翻译: 一种用于对多个时域输入帧进行滤波的分析滤波器组的实施例,其中输入帧包括多个有序输入样本,包括被配置为生成多个窗口化帧的加窗器,其中,窗口化框架包括多个窗口样本 其中,所述加权器被配置为使用样本提前值以重叠的方式处理所述多个输入帧,其中所述样本提前值小于输入帧除以2的有序输入样本的数量,并且时间/频率 转换器,被配置为提供包括多个输出值的输出帧,其中输出帧是窗口化帧的频谱表示。

    Audio Encoder and Audio Decoder
    29.
    发明申请
    Audio Encoder and Audio Decoder 有权
    音频编码器和音频解码器

    公开(公告)号:US20110173007A1

    公开(公告)日:2011-07-14

    申请号:US13004282

    申请日:2011-01-11

    IPC分类号: G10L19/00

    CPC分类号: G10L19/02 G10L19/022 H03M7/30

    摘要: An audio encoder for encoding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio signal, the audio encoder including a processor for deriving a coding context for a currently encoded coefficient of a current segment based on a previously encoded coefficient of a previous segment, the previously encoded coefficient representing a different time or frequency resolution than the currently encoded coefficient. The audio encoder further includes an entropy encoder for entropy encoding the current coefficient based on the coding context to obtain an encoded audio stream.

    摘要翻译: 一种用于对系数段进行编码的音频编码器,表示采样音频信号的不同时间或频率分辨率的系数段,音频编码器包括用于基于先前编码的当前段的当前编码系数导出编码上下文的处理器 前一段的系数,先前编码的系数表示与当前编码系数不同的时间或频率分辨率。 音频编码器还包括熵编码器,用于基于编码上下文对当前系数进行熵编码,以获得经编码的音频流。

    Audio Signal Synthesizer and Audio Signal Encoder
    30.
    发明申请
    Audio Signal Synthesizer and Audio Signal Encoder 有权
    音频信号合成器和音频信号编码器

    公开(公告)号:US20110173006A1

    公开(公告)日:2011-07-14

    申请号:US13004248

    申请日:2011-01-11

    IPC分类号: G10L19/00

    CPC分类号: G10L21/038 G10L19/02

    摘要: An audio signal synthesizer generates a synthesis audio signal having a first frequency band and a second synthesized frequency band derived from the first frequency band and comprises a patch generator, a spectral converter, a raw signal processor and a combiner. The patch generator performs at least two different patching algorithms, each patching algorithm generating a raw signal. The patch generator is adapted to select one of the at least two different patching algorithms in response to a control information. The spectral converter converts the raw signal into a raw signal spectral representation. The raw signal processor processes the raw signal spectral representation in response to spectral domain spectral band replication parameters to obtain an adjusted raw signal spectral representation.

    摘要翻译: 音频信号合成器生成具有从第一频带导出的第一频带和第二合成频带的合成音频信号,并且包括片生成器,频谱转换器,原始信号处理器和组合器。 补丁生成器执行至少两种不同的修补算法,每个修补算法生成原始信号。 补丁生成器适于响应于控制信息来选择至少两个不同的修补算法之一。 光谱转换器将原始信号转换为原始信号光谱表示。 原始信号处理器响应于频域谱带复制参数处理原始信号频谱表示,以获得经调整的原始信号频谱表示。