H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/86
H04N 5/04 (2006.01) H04N 5/12 (2006.01)
Patent
CA 1152634
PHF. 80-502 -20- ABSTRACT This circuit comprises a phase comparison stage and a synchronising control stage. The phase comparison stage includes a reference oscillator, a frequency divider connected to the output of the oscillator and whose output signals constitute the useful line deflection drive signals, as well as a phase comparator comprising a logic circuit and a counter. The logic circuit receives synchronising signals and the counter, which is connected to the output of the oscillator produces a signal which is representative of the phase deviation detected in control stage, the latter comprising a state detector for detect- ing the synchronised state, in which the phase deviation detected is below a limit value or the unsynchronised state division ratio of the frequency divider. This fre- quency divider comprises a counter, an adder, and a decoder the output signal of which is stabilised by means of a stabilising stage. The circuit consists for the major part of digital circuits.
368597
Decraemer Alain
Pernot Jean-Michel
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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