Method and apparatus of performing sample rate conversion of a multi-channel audio signal
US8089377B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2007 |
| Grant date | Jan 3, 2012 |
| Priority date | — |
| Expiry date | Nov 2, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H20/48
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus are disclosed for performing sampling rate conversion of an audio signal from a first sampling rate to any of a plurality of higher sampling rates using a single set of low-pass filter coefficients. Sampling rate conversion is accomplished by effectively up-sampling, low-pass filtering, and down-sampling the audio signal to generate interpolated output samples of a second digital audio signal at any of a plurality of sampling rates. The sampling rate conversion process includes storing a fixed set of filter coefficients as a plurality of phased subsets of filter coefficients, applying samples of the audio signal to the phased subsets in a rotational manner to generate filtered samples of the audio signal, and selecting and linear interpolating between certain filtered samples to generate samples of the second digital audio signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.