Signal encoding method, signal encoding apparatus, signal decoding method, signal decoding apparatus, and recording medium
US5778339A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1995 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Jul 18, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/0212
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In this invention, an approach is employed to carry out blocking of an input signal to transform the blocked signals into spectrum signals to divide the spectrum signals into a plurality of units to normalize them thereafter to implement variable length encoding to all or a portion of the spectrum signals to output the variable-length encoded signals along with normalization coefficient and the number of re-quantization bits of each unit, wherein an upper limit is provided with respect to the number of bits per each block of a signal to be encoded and outputted to compulsorily change, in a block for which the number of bits above the upper limit is required, normalization coefficient of at least one unit thereafter to re-quantize and entropy-encode a corresponding signal to output the encoded spectrum signal, thereby permitting hardware scale to be smaller as compared to the conventional apparatus without depending upon unevenness of the number of bits by variable length encoding. In addition, efficient encoding and decoding can be carried out in a form such that influence from a viewpoint of the hearing sense is small.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.