发明授权
- 专利标题: Speech coding system and method including spectral quantizer
- 专利标题(中): 语音编码系统及方法包括频谱量化器
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申请号: US114659申请日: 1998-07-13
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公开(公告)号: US6094629A公开(公告)日: 2000-07-25
- 发明人: Mark Lewis Grabb , Steven Robert Koch , Glen William Brooksby , Richard Louis Zinser, Jr.
- 申请人: Mark Lewis Grabb , Steven Robert Koch , Glen William Brooksby , Richard Louis Zinser, Jr.
- 申请人地址: PA King of Prussia
- 专利权人: Lockheed Martin Corp.
- 当前专利权人: Lockheed Martin Corp.
- 当前专利权人地址: PA King of Prussia
- 主分类号: G10L19/06
- IPC分类号: G10L19/06
摘要:
A speech coding system and associated method relies on a speech encoder and a speech decoder. The encoder includes a spectral quantizer for computing line spectral frequencies (LSFs) for respective frames of speech and for quantizing the LSFs to obtain a minimum bit representation of a spectral envelope of each respective frame of speech. For even numbered frames of speech the LSFs are quantized using a vector quantization technique. For odd numbered frames of speech samples the LSFs are quantized using a dynamic bit allocation (DBA) method. The dynamic bit allocation method determines an interpolation factor for interpolating between the LSFs of the previous and next frames. According to the dynamic bit allocation method the most perceptually important LSFs are represented by relatively more bits, while the least perceptually important LSFs are represented by relatively fewer bits. The system and associated method thereby reduces an overall bit rate required to represent, transmit or store the speech samples.
公开/授权文献
- US4914797A Axially centering apparatus for fusion-bonding optical fibers 公开/授权日:1990-04-10