U.S. Philips Corporation

Dieter Gutsmann

Siegfried Bohme

Hermann Treber

A method of and an arrangement for suppressing noise in a digital signal obtained by sampling an analog signal, more specifically a television signal, provide that always for two successive sample values, depending on their difference value, the second sample value is replaced by the preceding one if a predeterminable difference value is fallen short of.

Method of and arrangement for suppressing noise in a digital signal

A circuit arrangement for identifying the transmission standard of a color television signal, having a chrominance subcarrier upon which chrominance information is modulated and color synchronising pulses, includes circuitry (14, 21, 24, 25) for determining the frequency of the chrominance subcarrier which, in those cases in which a given standard of the color television signal can unambiguously be concluded from the determined chrominance subcarrier frequency of the color television signal to be decoded, the decoder is immediately switched to the decoding of this signal of this standard, and in addition includes circuitry (23, 22) which determine the vertical deflection frequency of the television signal and ascertain whether the chrominance subcarrier has a line-sequentially alternating phase, and that in those cases in which the determined chrominance subcarrier frequency cannot unambiguously be assigned to a given standard, these information components are also used for identifying the standard of the color television signal to be decoded and for adjusting the decoder to this standard, in addition to the chrominance subcarrier frequency.

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Hamburg, Germany

Dieter Gutsmann