Wideband audio signal encoding apparatus that divides wide band audio data into a number of sub-bands of numbers of bits for quantization based on noise floor information
US6449596B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1999 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Jun 7, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/667
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A wide band audio signal encoding apparatus, a wide band audio signal decoding apparatus, a wide band audio signal encoding and decoding apparatus and a wide band audio signal recording medium, each having a low bit rate, a wide band, a low distortion factor and a wide dynamic range are provided. Wide band audio data is divided into signal data of a predetermined natural number N of sub-bands, and the number of bits for quantization for sub-sampling is determined based on noise floor information of the above wide band audio data. The signal data of the N sub-bands are sub-sampled by the respective numbers of bits for quantization, and encoded data obtained by multiplexing the signal data of the sub-sampled N sub-bands are recorded on a wide band audio signal recording medium. Therefore, both he characteristics of an extremely wide dynamic range and a wide band can be concurrently achieved at a relatively low bit rate per channel. This arrangement allows the achievement of recording and reproduction of an extremely transparent natural sound extending to an ultrahigh frequency region, and a recording medium for recording a signal of the above wide band audio data and a reproduction s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.