Patent · US Expired

Radio receiver with an intermodulation detector

US5483694A · kind A · utility

14Cited by

11References

13Claims

0Family size

Assignee

Blaupunkt-Werke GmbH · DE

Inventors

Stefan Bartels · Bienenbüttel, DE
Jurgen Kasser · Bad Salzdetfurth, DE
Djahanyar Chahabadi · Hildesheim, DE

Key dates

Filing date	Dec 8, 1993
Grant date	Jan 9, 1996
Priority date	—
Expiry date	Dec 8, 2013

Classification

Technology area (CPC H)Electricity
CPC primaryH04B1/109
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

In a radio receiver with an input circuit which can be supplied with received signals, with a mixer for deriving an IF signal, and with an IF filter, the passband range corresponds to a usable signal range of the received signal, the received signals are amplitude-modified with an auxiliary signal for detecting intermodulation, in the course of which sidebands are generated outside of the useful signal range. The amplitudes of at least one sideband generated by modulation with the auxiliary signal and of the received carrier are compared in the IF signal. In case of deviations from a ratio based on the modulation factor during modulation with the auxiliary signal, a signal indicating the presence of intermodulation is derived.

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