Filter combination for sampling rate conversion
US6137349A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1998 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Jul 2, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0621
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A filter combination for sampling rate conversion is disclosed comprising a series combination of: an input low-pass filter (1) whose attenuation characteristic (tp1) has at least one first attenuation value (a1) in the vicinity of one-half and 1.5 times the frequency of a digitization clock (f1); a time-invariant interpolation filter (2) for increasing the number of samples from that of the first data sequence (d1) by an integral factor whose attenuation characteristic (tp2) has at least one second attenuation value (a2) in the vicinity of the frequency of the digitization clock (f1) and essentially at least one third attenuation value (a3) in the region between one-half and 1.5 times the frequency of the digitization clock; and a time-varying interpolation filter (3) for interpolating a data sequence (d5) provided at the output of the time-invariant interpolation filter (2), the attenuation characteristic (tp3) of the time-varying interpolation filter (3) having at least one fourth attenuation value (a4) in the vicinity of twice the frequency of the digitization clock (f1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.