H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/80
H04B 1/04 (2006.01) H04L 7/027 (2006.01) H04L 27/233 (2006.01) H04L 27/18 (2006.01)
Patent
CA 1235460
13 ABSTRACT: An arrangement for recovering a clock signal of frequency 1/T from an angle-modulated carrier signal having a modulation index m = 0.5 comprises a frequency doubler, a circuit for generating a clock signal component from the frequency-doubled signal, a clock filter for selecting the generated clock signal component and a pulse shaper for producing a clock pulse signal. The arrangement produces a reliable clock signal within a very short time after the start of the signal reception, because the fre- quency doubler comprises a hard limiter, a first bandpass filter connected thereto and having a Q ? 10, a balanced modulator connected to the limiter and to the first band- pass filter and a second bandpass filter having a Q ? 10 tuned to twice the carrier frequency 2fc; and because the generating circuit comprises a frequency converter for converting the frequency-doubled signal to a frequency band around a carrier frequency fo of the order of twice the clock frequency 2/T, a bandstop filter tuned to frequency fo and having a Q ? 10 and a squaring circuit connected to the band stop filter. The arrangement is attractive for use in receivers for radio communication systems which require a very fast acquisition of the correct clock phase.
485714
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
LandOfFree
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