Sampling frequency converter for converting a lower sampling frequency to a higher sampling frequency and a method therefor
US4903019A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1988 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Aug 23, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0685
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A converter converts time-sequential input digital data Q.sub.i having a sampling frequency f.sub.m to time-sequential digital data P.sub.j having a sampling frequency f.sub.n (f.sub.n :f.sub.m =n:m, n>m, n, m; an integer), which comprises a time axis compressing converter 6 receiving the time-sequential input digital data Q.sub.i, adding (n-m) dummy data D.sub.K every m received input data Q.sub.i and outputting the combined data at the frequency f.sub.n and a single transversal type digital filter 12 for performing filter processing on output data from the time-axis compressing converter 6 in which tap coefficient data .beta..sub.k is sandwiched at the cycle of 1/f.sub.n. The tap coefficient data is selected to nullify dummy data D.sub.K which periodically appears, based on impulse response data obtained by sampling a sampling function for the sampling frequency f.sub.m with a frequency of the least common multiple of the sampling frequencies f.sub.n and f.sub.m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.