公开(公告)号：US20050171785A1

公开(公告)日：2005-08-04

申请号：US10485616

申请日：2003-06-24

申请人： Toshiyuki Nomura ,  Osamu Shimada ,  Yuichiro Takamizawa ,  Masahiro Serizawa ,  Naoya Tanaka ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Chong ,  Kim Kuah ,  Sua Neo

发明人： Toshiyuki Nomura ,  Osamu Shimada ,  Yuichiro Takamizawa ,  Masahiro Serizawa ,  Naoya Tanaka ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Chong ,  Kim Kuah ,  Sua Neo

IPC分类号： H03M7/30 ,  G10L19/00

CPC分类号： G10L21/038 ,  G10L19/032

摘要： An energy corrector (105) for correcting a target energy for high-frequency components and a corrective coefficient calculator (106) for calculating an energy corrective coefficient from low-frequency subband signals are newly provided. These processors perform a process for correcting a target energy that is required when a band expanding process is performed on a real number only. Thus, a real subband combining filter and a real band expander which require a smaller amount of calculations can be used instead of a complex subband combining filter and a complex band expander, while maintaining a high sound-quality level, and the required amount of calculations and the apparatus scale can be reduced.

摘要翻译： 新提供了用于校正高频分量的目标能量的能量校正器（105）和用于从低频子带信号计算能量校正系数的校正系数计算器（106）。 这些处理器执行用于校正仅对实数执行频带扩展处理时所需的目标能量的处理。 因此，可以使用需要较少量的计算的真实子带组合滤波器和实频扩展器来代替复数子带组合滤波器和复频带扩展器，同时保持高音质水平，并且所需的计算量 并且可以减少设备规模。

公开(公告)号：US20050080621A1

公开(公告)日：2005-04-14

申请号：US10491894

申请日：2003-07-30

申请人： Mineo Tsushima ,  Naoya Tanaka ,  Takeshi Norimatsu ,  Kok Chong ,  Kim Kuah ,  Sua Neo ,  Toshiyuki Nomura ,  Osamu Shimada ,  Yuichiro Takamizawa ,  Masahiro Serizawa

发明人： Mineo Tsushima ,  Naoya Tanaka ,  Takeshi Norimatsu ,  Kok Chong ,  Kim Kuah ,  Sua Neo ,  Toshiyuki Nomura ,  Osamu Shimada ,  Yuichiro Takamizawa ,  Masahiro Serizawa

IPC分类号： G10L19/08 ,  H03M7/30 ,  G10L19/02

CPC分类号： G10L21/038 ,  G10L19/02

摘要： A wideband, high quality audio signal is decoded with few calculations at a low bitrate. Unwanted spectrum components accompanying sinusoidal signal injection by a synthesis subband filter built with real-value operations are suppressed by inserting a suppression signal to subbands adjacent to the subband to which the sine wave is injected. This makes it possible to inject a desired sinusoid with few calculations.

摘要翻译： 宽带，高质量的音频信号以低比特率进行少量计算解码。 通过用实数值操作构建的合成子带滤波器伴随正弦信号注入的不需要的频谱分量通过将抑制信号插入到与正弦波被注入的子带相邻的子带来被抑制。 这样可以很少的计算注入所需的正弦波。

公开(公告)号：US20080040120A1

公开(公告)日：2008-02-14

申请号：US11890275

申请日：2007-08-03

申请人： Evelyn Kurniawati ,  Kim Kuah ,  Sapna George

发明人： Evelyn Kurniawati ,  Kim Kuah ,  Sapna George

IPC分类号： G10L19/00

CPC分类号： G10L19/032 ,  G10L19/002

摘要： Perceptual audio coder refers to audio compression schemes that exploit the properties of human auditory perception. The coder allocates the quantization noise below the masking threshold such that even with the bit rate limitation, the noise is imperceptible to the ear. These distortion and bit rate requirement makes the bit allocation-quantization process a considerable computational effort. One method includes incrementally adjusting a global gain according to a gradient. The gradient could be adjusted each time the number of bits used to represent a quantized value is counted. Another method includes limiting a rate controlling parameter to a predetermined number of loops. The method could also include deriving a global gain to ensure exit from the loop. Accordingly, embodiments of the present disclosure provide a fast and efficient method to derive the rate controlling parameter and can be applied to generic perceptual audio encoders where low computational complexity is required.

摘要翻译： 感知音频编码器是指利用人类听觉感知属性的音频压缩方案。 编码器将量化噪声分配到掩蔽阈值以下，使得即使使用比特率限制，噪声对耳朵也是不可察觉的。 这些失真和比特率要求使得比特分配量化处理相当大的计算量。 一种方法包括根据梯度递增地调整全局增益。 每次用于表示量化值的位数被计数时，可以调整梯度。 另一种方法包括将速率控制参数限制到预定数量的循环。 该方法还可以包括导出全局增益以确保退出循环。 因此，本公开的实施例提供了一种用于导出速率控制参数的快速和有效的方法，并且可以将其应用于需要低计算复杂度的通用感知音频编码器。