Patent · US Expired

Filtering of a receive frequency band

US6975847B1 · kind B1 · utility

2Cited by

7References

12Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Bernd Bienek · Oberhausen, DE
Edgar Bolinth · Rheydt, DE
Yusuf Kalayci · Duisburg, DE
Uwe Schwark · Hamburg, DE

Key dates

Filing date	Sep 16, 1999
Grant date	Dec 13, 2005
Priority date	—
Expiry date	Sep 16, 2019

Classification

Technology area (CPC H)Electricity
CPC primaryH04B1/30
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

The invention relates to the filtering of a subfrequency band out of a receive frequency band, in which a carrier frequency for prefiltering the receive frequency band and an intermediate frequency for demodulating the frequency band filtered out during the prefiltering and for generating a frequency baseband are inserted into the signal propagation path, in which the desired subfrequency band is filtered out of the frequency baseband by a post-filtering and in which the carrier frequency, the intermediate frequency and the post-filtering are matched to one another.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.