Patent · US Expired

Production of a frequency control signal in an FSK receiver

US6081560A · kind A · utility

0Cited by

6References

10Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Manfred Biehl · Norderstedt, DE
Winfried Jansen · Ellerbek, DE
Ralf Gero Pilaski · Hamburg, DE

Key dates

Filing date	Oct 29, 1997
Grant date	Jun 27, 2000
Priority date	—
Expiry date	Oct 29, 2017

Classification

Technology area (CPC H)Electricity
CPC primaryH04L27/16
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

Circuit arrangement for generating a control signal. A circuit arrangement for generating a control signal for a controllable oscillator of a receiving device, is arranged to mix an FSK modulated input signal, having at least two predetermined input frequencies, with an oscillation, output by a controllable oscillator, so as to form an intermediate frequency signal, as well as to derive from the intermediate frequency signal a data signal whose instantaneous value is determined by the frequency of the intermediate frequency signal (intermediate frequency) and also a demodulator pulse signal whose frequency and/or phase is a measure of the frequency and/or phase of the intermediate frequency signal, from the intermediate frequency signal. The circuit arrangement includes a control signal generating branch for deriving the control signal from the demodulator pulse signal, an interrupt signal generating branch for deriving an interrupt signal from the data signal during the time intervals in which the data signal changes its value, and also an interrupt stage which suppresses the extraction of a value for the control signal from the demodulator pulse signal in response to the appearan…

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