US 7,065,028 B2 · Method and device for generating a clock signal that is coupled to a reference signal

Abstract

In order to generate a clock signal (fT1) that is coupled to a reference signal (FBAS), especially to an analog video signal, a free-running clock pulse (fT1) is generated from a high-frequency clock pulse (f0) and the reference signal (FBAS) is digitized therewith. In addition, a second clock pulse (fT1) is generated from the high-frequency clock pulse (f0) and the phase deviation between the first clock pulse (fT2) and the second clock pulse (fT1) is determined. The digitized sampling values of the reference signal (FBAS) at the first clock frequency (fT1) are converted, according to the phase deviation determined, into corresponding digitized sampling values having the second clock frequency (fT1) and are used as a target specification for generating the second clock pulse (fT1) thus coupled to the reference signal.

Claims26

Dependent claims

A method for generating a clock signal coupled to a reference signal, comprising the steps:

a) supplying an operating clock signal (f0);
b) supplying a first clock signal (fT2);
c) supplying a sequence of sampling values of the reference signal at the frequency of the first clock signal (fT2);
d) supplying a second clock signal (fT1);
e) determining the phase deviation between the first clock signal (fT2) and the second clock signal (fT1);
and
f) converting the sampling values of the reference signal with the frequency of the first clock signal (fT2) to corresponding sampling values with the frequency of the second clock signal (fT1), the conversion being based on the phase deviation determined in step e), where the resulting sampling values of the reference signal are used in step d) as the target specification to generate the second clock signal (fT1) coupled with the reference signal.

4 more elements

Dependencies are inferred from the claim text.

Method and device for generating a clock signal that is coupled to a reference signal

Life of this patent

Method and device for generating a clock signal that is coupled to a reference signal

Life of this patent

Abstract

Claims26