发明名称 |
High efficiency encoding device and a noise spectrum modifying device and method |
摘要 |
An apparatus and method for processing an input digital signal in which an input digital audio signal at an input terminal 11 is supplied via a one-block delay unit 17 to a difference unit 20, an output of which is processed by a noise-shaping circuit 21 and restored by a near-instantaneous compressor 26, a near-instantaneous expander 27 and an accumulator 28 so as to be fed back to the difference unit 20 to find a difference between a signal of a directly preceding sample and a signal of the current sample. The noise shaping circuit 21 modifies the spectrum of the quantization noise by taking aural characteristics, such as equal-loudness characteristics or masking characteristics, into account for diminishing the level of the quantization noise as perceived by the ear. The noise level as perceived may be reduced in a manner desirable for the sound quality without changing the existing format.
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申请公布号 |
US5757938(A) |
申请公布日期 |
1998.05.26 |
申请号 |
US19950439089 |
申请日期 |
1995.05.08 |
申请人 |
SONY CORPORATION |
发明人 |
AKAGIRI, KENZO;AKUNE, MAKOTO |
分类号 |
G10L21/02;G10L19/00;H03G7/00;H03M7/30;H04B1/66;H04B14/04;H04R3/04;(IPC1-7):H03G5/00 |
主分类号 |
G10L21/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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