Method of encoding frequency coefficients in an AC-3 encoder
US6775587B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2003 |
| Grant date | Aug 10, 2004 |
| Priority date | — |
| Expiry date | Jan 14, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for encoding frequency coefficients in an AC-3 Encoder. The method includes: representing frequency coefficients in theform of a respective exponent and mantissa; coding the exponents; and shifting the mantissas to compensate for changes in the exponent values, wherein the exponents comprise an original exponent set (e0, e1, . . . en−1) which is mapped to a new exponent set (e0′, e1′, . . . , e′n−1) after coding, so as to satisfy: ∥e′i+1−e′i∥<D, where i=0, . . . , n−1 and D is a maximum allowed difference between two consecutive exponents, and e′i≦ei.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.