Patent · US Expired

Circuit and method of suppressing inter-station radio tuning noise

US4829592A · kind A · utility

4Cited by

13References

11Claims

0Family size

Assignee

Blaupunkt-Werke GmbH · DE

Inventors

Reinhard Wieschhoff · Hildesheim, DE
Peter Seibold · Bad Salzdetfurth, DE

Key dates

Filing date	Dec 24, 1985
Grant date	May 9, 1989
Priority date	—
Expiry date	Dec 24, 2005

Classification

Technology area (CPC H)Electricity
CPC primaryH03G3/348
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

To suppress tuning noise interferences, and particularly transients, such as whistles and the like, especially in FM receivers during returning of the receiver, an inter-station retuning muting circuit is, in accordance with the invention, modified by including therein a switchable filter (2) having a low-frequency cut-off (f.sub.g2) which is higher than the frequency of noise interference due to retuning of the receiver, the filter being switched to the higher frequency cut-off level for a period of time (T.sub.E) which exceeds the normal muting time (T.sub.E) of FM receivers.

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