Digital time signal filtering method and device for transmission channel echo correction
US5768165A · kind A · utility
6Cited by
5References
12Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 8, 1995 |
| Grant date | Jun 16, 1998 |
| Priority date | — |
| Expiry date | Sep 8, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0213
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method for filtering a time signal (e(t)) sampled in blocks of N samples (e(n),e(k)) uses a transfer function defined in the frequency domain by LN samples (H(K)). The transfer function is filtered by a time window (g1) of width N, and a frequency subsampling of ratio N is performed to give a partial transfer function defined over N samples (H1(k)). The method enables the complexity of circuits operating in real time to be optimized. The technique is particularly suitable for correcting long echoes in television picture receivers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.