Multi-band digital receiving apparatus and method with bandwidth reduction
US5280636A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1991 |
| Grant date | Jan 18, 1994 |
| Priority date | — |
| Expiry date | Jun 13, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/66
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Multiple simultaneous uses of a multi-service digital receiver are made possible with a single practical analog-to-digital converter by translating the various service bands in frequency to form a single, generally continuous composite service band in which substantial frequency gaps between the different services are eliminated. Bandwidth requirements are further reduced by a bandfolding technique in which at least one service waveband is divided about an intermediate mixing frequency, the divided portions are overlapped so that they collectively occupy a sub-waveband with a smaller bandwidth than the original band, and the mixing frequency is chosen such that user-selected frequencies do not interfere with other active frequencies. Interference between non-selected active frequencies is permissible and simply ignored.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.