Sample rate converter
US5982305A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Sep 17, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0685
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A sample rate converter for converting a digital signal having a particular sample rate frequency into a signal having a different, specified sample rate frequency. The converter includes an interpolation function for increasing the sample rate frequency of the input signal by an interpolation factor (L), so as to produce an intermediate signal having an intermediate sample rate frequency. The intermediate signal is then filtered with a predefined single-stage, low-pass filter to eliminate high frequency noise introduced as a result of the interpolation. The filtered intermediate signal is then supplied to a decimation function, which extracts samples from the intermediate signal in accordance with a decimation factor (M), thereby producing an output signal having the desired sample rate frequency. The filter is configured so as to be optimized to provide the best conversion results for a plurality of critical input/output sample rate conversion pairs, which are used to define the filter cutoff frequency. The converter can be equipped with a single predefined filter, which is then used for all conversions, or the converter can be equipped with a plurality of predefined filters, and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.