Low pass digital filter implemented in a modem of a television system
US6307903A · kind A · utility
7Cited by
13References
43Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1999 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Jul 26, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0232
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A low pass digital filter using cascade polyphase recursive digital signal processing circuit. The filter in the receive direction may contain a re-sampling Hogenauer filter followed by an equalizer filter to correct for its non-flat pass-band spectral response. The output of the spectral equalizer may be processed by a poly-phase re-sampling filter to reduce the sample rate. A clean-up filter may insert two stop-band spectral intervals in the frequency response of the earlier stages. The filter in the receive direction may be implemented by using similar components in the reverse order.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.