Universal sampling rate converter for digital audio frequencies
US7177812B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2000 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Jul 31, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0642
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method for conversion of input audio frequency data, at an input sample frequency, to output audio frequency data, at an output sample frequency. The input data is subjected to expansion to produce expanded data at an output sample frequency. The expanded data is interpolated to produce output data. In one embodiment of the invention the interpolation is effected by a process that also filters the output data. In another embodiment, the input data is sampled by an integer factor to produce expanded data, the expanded data is then interpolated to produce the output data. Also disclosed is a method of transition of a signal output, at one frequency, to a signal output at another frequency. The signal output at said one frequency is faded out over a period, and the signal output at said other frequency is faded in over that period. Both signal outputs are combined to produce the signal output over said period. Apparatus for effecting the methods is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.