Device for automatically controlling the asymmetry of a signal

Details Device for automatically controlling the asymmetry of a signal Device for automatically controlling the asymmetry of a signal

H - Electricity

04

N

352/32.1

H04N 5/781 (2006.01) H04N 5/91 (2006.01)

Patent

CA 1134034

PHN.8795 30-7-1977 ABSTRACT When a colour television signal is recorded on a video disc and said signal is read a complication arises owing to the asymmetry which is produced in the signal by the various process steps. This gives rise to spurious components whose influence should be minimized by a suitably selected coding system. The invention proposes a device with which the influence of this asymmetry is automatically reduced. This device comprises two separator stages for supplying two sub-signals which respectively represent the rising and falling edges of the information signal. The phase relationship between these two sub- signals is controlled with the aid of a phase shifter. The control signal required for this is produced with theaid of a detector which responds to an asymmetry component in the information signal. The two corrected sub signals are subsequently recombined to the information signal. 14

303632

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