Channel separating filter apparatus, PSK demodulator apparatus and PSK receiver apparatus each equipped with channel separating filter apparatus
US5999575A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1997 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Jan 17, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
There is disclosed a channel separating filter apparatus for separating a frequency-multiplexed signal comprised of channel signals into respective channel signals. A frequency-converting section frequency-converts the frequency-multiplexed signal into a plurality of channel signals, so that an average value of carrier wave frequencies of two channel signals which are located in the center of the frequency-multiplexed signal and are adjacent to each other becomes substantially zero, and then outputs the plurality of frequency-converted channel signals. Thereafter, a channel separating section separates the plurality of frequency-converted channel signals outputted from the frequency-converting section into respective channel signals each having only a frequency component of each channel signal, thereby separating the frequency-multiplexed signal into at least two channel signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.