Encoding device, decoding device, encoding method and decoding method
US9384749B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2012 |
| Grant date | Jul 5, 2016 |
| Priority date | — |
| Expiry date | Mar 19, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/0388
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
By copying to a high-frequency band portion (extension band) a low-frequency band portion in which peaking has been set to a sufficiently low state, this encoding device is capable of preventing generation of a spectrum with overly high peaking in the high-frequency band portion, and of generating a high-quality extension band spectrum. This device comprises: a maximum value search unit which searches, in each of multiple sub-bands obtained by dividing the low-frequency band portion of an audio signal and/or music signal below a prescribed frequency, for the maximum value of the amplitude of a first spectrum obtained by decoding first encoded data, which is encoded data in the low-frequency band portion; and an amplitude normalization unit which obtains a normalized spectrum by normalizing, at the maximum values of the amplitude of each sub-band, the first spectrum contained in each sub-band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.