发明名称 |
Computationally efficient audio coder |
摘要 |
The present invention provides a computationally efficient technique for compression encoding of an audio signal, and further provides a technique to enhance the sound quality of the encoded audio signal. This is accomplished by including more accurate attack detection and a computationally efficient quantization technique. The improved audio coder converts the input audio signal to a digital audio signal. The audio coder then divides the digital audio signal into larger frames having a long-block frame length and partitions each of the frames into multiple short-blocks. The audio coder then computes short-block audio signal characteristics for each of the partitioned short-blocks based on changes in the input audio signal. The audio coder further compares the computed short-block characteristics to a set of threshold values to detect presence of an attack in each of the short-blocks and changes the long-block frame length of one or more short-blocks upon detecting the attack in the respective one or more short-blocks.
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申请公布号 |
US2004196913(A1) |
申请公布日期 |
2004.10.07 |
申请号 |
US20040466027 |
申请日期 |
2004.05.20 |
申请人 |
CHAKRAVARTHY K. P. P. KALYAN;RUTHRAMOORTHY NAVANEETHA K;PATWARDHAN PUSHKAR P;MOLNDAL BISHWARUP |
发明人 |
CHAKRAVARTHY K. P. P. KALYAN;RUTHRAMOORTHY NAVANEETHA K;PATWARDHAN PUSHKAR P;MOLNDAL BISHWARUP |
分类号 |
G10L19/00;G10L19/02;H04L25/02;(IPC1-7):H04B14/04;H04B1/10;H04J3/16 |
主分类号 |
G10L19/00 |
代理机构 |
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