公开(公告)号：US06795740B1

公开(公告)日：2004-09-21

申请号：US09516387

申请日：2000-03-01

申请人： Ke Chiang Chu ,  Hong Kaura ,  James Peter Hoddie

发明人： Ke Chiang Chu ,  Hong Kaura ,  James Peter Hoddie

IPC分类号： G06E1700

CPC分类号： H03G3/3089 ,  H03G7/007 ,  H03G11/008

摘要： The invention is a method, apparatus and computer readable program for eliminating overflow and underflow by re-adjusting or rectifying the audio levels of an audio signal in those portions where overflow/underflow occurs. In a first preferred embodiment a single stage scale down solution is provided in starting and end points of the overflow/underflow areas in the audio signal are detected, and a number of discrete sampling points along the audio signal curve between these two points are adjusted by a predetermined multiplier in order to reduce the positive level (in the case of overflow) or negative level (in the case of underflow) of each discrete sampling point. Using the single stage scale down solution of the present invention, a new audio signal is created having no overflow/underflow, yet maintaining the former generally smooth shape of the audio signal waveform and signal characteristics, without completely clipping the audio levels. In a second preferred embodiment a multi-stage scale down solution is provided in which the overflow/underflow is divided into sections, such that the discrete sampling points in one section may be adjusted by a first multiplier in order to reduce their audio levels; while discrete sampling points in another, section may be adjusted by a second multiplier (which is preferably different than the first multiplier) in order to reduce their audio levels. Accordingly, a new audio signal is constructed with reduced overflow/underflow, yet maintaining a generally smooth signal curve and characteristics, without completely clipping the audio levels.

摘要翻译： 本发明是一种用于通过在发生溢出/下溢的部分中重新调整或整流音频信号的音频电平来消除上溢和下溢的方法，装置和计算机可读程序。在第一优选实施例中，单级缩小解决方案是 检测在音频信号中的溢出/下溢区域的起点和终点中设置的，并且通过预定的乘数来调整沿着这两个点之间的音频信号曲线的多个离散采样点，以便减少正的水平（在 溢出的情况）或每个离散采样点的负电平（在下溢的情况下）。 使用本发明的单级缩小方案，创建了没有上溢/下溢的新的音频信号，并且保持了音频信号波形和信号特性的前者大致平滑的形状，而没有完全限制音频电平。在第二 优选实施例提供了一种多级缩小的解决方案，其中溢出/下溢被分成多个部分，使得一个部分中的离散采样点可以被第一乘法器调整以便降低它们的音频电平; 而另一部分中的离散采样点可以由第二乘法器（其优选地与第一乘法器不同）来调整，以便降低它们的音频电平。 因此，新的音频信号被构造为具有减少的溢出/下溢，但是在没有完全限制音频电平的情况下保持大致平滑的信号曲线和特性。

公开(公告)号：US08442838B2

公开(公告)日：2013-05-14

申请号：US13031963

申请日：2011-02-22

申请人： Shyh-Shiaw Kuo ,  Hong Kaura ,  William G. Stewart

发明人： Shyh-Shiaw Kuo ,  Hong Kaura ,  William G. Stewart

IPC分类号： G10L19/00 ,  G10L19/02

CPC分类号： G10L19/035

摘要： A hybrid audio encoding technique incorporates both ABR, or CBR, and VBR encoding modes. For each audio coding block, after a VBR quantization loop meets the NMR target, a second quantization loop might be called to adaptively control the final bitrate. That is, if the NMR-based quantization loop results in a bitrate that is not within a specified range, then a bitrate-based CBR or ABR quantization loop determines a final bitrate that is within the range and is adaptively determined based on the encoding difficulty of the audio data. Excessive bitrates from use of conventional VBR mode are eliminated, while still providing much more constant perceptual sound quality than use of conventional CBR mode can achieve.

公开(公告)号：US07895045B2

公开(公告)日：2011-02-22

申请号：US12610615

申请日：2009-11-02

申请人： Shyh-shiaw Kuo ,  Hong Kaura ,  William G. Stewart

发明人： Shyh-shiaw Kuo ,  Hong Kaura ,  William G. Stewart

IPC分类号： G10L19/00 ,  G10L19/02

CPC分类号： G10L19/035

摘要： A hybrid audio encoding technique incorporates both ABR, or CBR, and VBR encoding modes. For each audio coding block, after a VBR quantization loop meets the NMR target, a second quantization loop might be called to adaptively control the final bitrate. That is, if the NMR-based quantization loop results in a bitrate that is not within a specified range, then a bitrate-based CBR or ABR quantization loop determines a final bitrate that is within the range and is adaptively determined based on the encoding difficulty of the audio data. Excessive bitrates from use of conventional VBR mode are eliminated, while still providing much more constant perceptual sound quality than use of conventional CBR mode can achieve.

摘要翻译： 混合音频编码技术包括ABR或CBR和VBR编码模式。 对于每个音频编码块，在VBR量化循环满足NMR目标之后，可以调用第二量化循环来自适应地控制最终比特率。 也就是说，如果基于NMR的量化循环导致不在特定范围内的比特率，则基于比特率的CBR或ABR量化循环确定在该范围内的最终比特率，并且基于编码难度自适应地确定 的音频数据。 消除了使用常规VBR模式的过多比特率，同时仍然提供比使用常规CBR模式可以实现更多的恒定的感知音质。

公开(公告)号：US20100049532A1

公开(公告)日：2010-02-25

申请号：US12610615

申请日：2009-11-02

申请人： Shyh-Shiaw Kuo ,  Hong Kaura

发明人： Shyh-Shiaw Kuo ,  Hong Kaura

IPC分类号： G10L19/00

CPC分类号： G10L19/035

摘要： A hybrid audio encoding technique incorporates both ABR, or CBR, and VBR encoding modes. For each audio coding block, after a VBR quantization loop meets the NMR target, a second quantization loop might be called to adaptively control the final bitrate. That is, if the NMR-based quantization loop results in a bitrate that is not within a specified range, then a bitrate-based CBR or ABR quantization loop determines a final bitrate that is within the range and is adaptively determined based on the encoding difficulty of the audio data. Excessive bitrates from use of conventional VBR mode are eliminated, while still providing much more constant perceptual sound quality than use of conventional CBR mode can achieve.

摘要翻译： 混合音频编码技术包括ABR或CBR和VBR编码模式。 对于每个音频编码块，在VBR量化循环满足NMR目标之后，可以调用第二量化循环来自适应地控制最终比特率。 也就是说，如果基于NMR的量化循环导致不在特定范围内的比特率，则基于比特率的CBR或ABR量化循环确定在该范围内的最终比特率，并且基于编码难度自适应地确定 的音频数据。 消除了使用常规VBR模式的过多比特率，同时仍然提供比使用常规CBR模式可以实现更多的恒定的感知音质。

公开(公告)号：US07634413B1

公开(公告)日：2009-12-15

申请号：US11067080

申请日：2005-02-25

申请人： Shyh-shiaw Kuo ,  Hong Kaura

发明人： Shyh-shiaw Kuo ,  Hong Kaura

IPC分类号： G10L19/00 ,  G10L19/02

CPC分类号： G10L19/035

摘要： A hybrid audio encoding technique incorporates both ABR, or CBR, and VBR encoding modes. For each audio coding block, after a VBR quantization loop meets the NMR target, a second quantization loop might be called to adaptively control the final bitrate. That is, if the NMR-based quantization loop results in a bitrate that is not within a specified range, then a bitrate-based CBR or ABR quantization loop determines a final bitrate that is within the range and is adaptively determined based on the encoding difficulty of the audio data. Excessive bitrates from use of conventional VBR mode are eliminated, while still providing much more constant perceptual sound quality than use of conventional CBR mode can achieve.

摘要翻译： 混合音频编码技术包括ABR或CBR和VBR编码模式。 对于每个音频编码块，在VBR量化循环满足NMR目标之后，可以调用第二量化循环来自适应地控制最终比特率。 也就是说，如果基于NMR的量化循环导致不在特定范围内的比特率，则基于比特率的CBR或ABR量化循环确定在该范围内的最终比特率，并且基于编码难度自适应地确定 的音频数据。 消除了使用常规VBR模式的过多比特率，同时仍然提供比使用常规CBR模式可以实现更多的恒定的感知音质。

公开(公告)号：US20110145004A1

公开(公告)日：2011-06-16

申请号：US13031963

申请日：2011-02-22

申请人： Shyh-Shiaw Kuo ,  Hong Kaura ,  William G. Stewart

发明人： Shyh-Shiaw Kuo ,  Hong Kaura ,  William G. Stewart

IPC分类号： G10L19/00

CPC分类号： G10L19/035

摘要： A hybrid audio encoding technique incorporates both ABR, or CBR, and VBR encoding modes. For each audio coding block, after a VBR quantization loop meets the NMR target, a second quantization loop might be called to adaptively control the final bitrate. That is, if the NMR-based quantization loop results in a bitrate that is not within a specified range, then a bitrate-based CBR or ABR quantization loop determines a final bitrate that is within the range and is adaptively determined based on the encoding difficulty of the audio data. Excessive bitrates from use of conventional VBR mode are eliminated, while still providing much more constant perceptual sound quality than use of conventional CBR mode can achieve.

摘要翻译： 混合音频编码技术包括ABR或CBR和VBR编码模式。 对于每个音频编码块，在VBR量化循环满足NMR目标之后，可以调用第二量化循环来自适应地控制最终比特率。 也就是说，如果基于NMR的量化循环导致不在特定范围内的比特率，则基于比特率的CBR或ABR量化循环确定在该范围内的最终比特率，并且基于编码难度自适应地确定 的音频数据。 消除了使用常规VBR模式的过多比特率，同时仍然提供比使用常规CBR模式可以实现更多的恒定的感知音质。