Audio processing method, audio processing apparatus, and recording reproduction apparatus capable of outputting voice having regular pitch regardless of reproduction speed
US6360198B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1999 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | May 6, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A reproduction part reproduced at a changeable speed ratio r. An A/D conversion part A/D converts, based on sampling frequency fi, an audio signal reproduced at a speed different from that upon recording. A block data division part divides audio data based on an attribute possessed by the audio data. An audio data connection part successively interpolates or thins out the divided audio data based on a ratio of 1/r. A D/A conversion part D/A converts the interpolated or thinned-out audio data based on sampling frequency fo. If a relation of fi/fo=r/c is satisfied, the audio signal is outputted as a sound of high quality constantly synchronized with an image signal and having a pitch which does not change irrespective of the changeable speed ratio r at which the image signal is reproduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.