U.S. Philips Corporation

Frank Volmari

Hartmut S Harlos

A method for the analog/digital conversion and an arrangement for the analog-to-digital conversion of an analog signal, particularly a picture signal, into a digital signal by at least two analog-to-digital converters which are clocked by at least two phase-shifted clock signals and whose output signals are combined to a digital picture signal by a multiplexer is disclosed. In order to achieve an individual adaptation to different characteristics of the analog-to-digital converters, each analog-to-digital converter is preceded by an automatic gain control circuit and a clamping stage, which clamps the picture signal at a given amplitude value, the analog signal being applied to the automatic gain control circuit and the clamping stage.

Method and arrangement for the analog/digital conversion of a picture

A method and arrangement for steepening the edges of a color signal, in which a control signal is generated which is obtained by differentiation, rectification and subsequent differentiation of the rectified first differentiation, and is temporarily assigned to the color signal, and in which, in dependence upon the control signal, chrominance values of reference pixels of the color signal are copied on edge pixels of the color signal in such a way that the chrominance values of reference pixels preceding the edge pixels are copied on the edge pixels in the case of a positive control signal and the chrominance values of reference pixels following the edge pixels are copied on the edge pixels in the case of a negative control signal, false chrominance values of pulses which are steepened are prevented in that a chrominance value of a reference pixel is copied on an edge pixel only when the values of the control signal in the assigned region between the reference pixel and the edge pixel do not have a zero crossing.

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Rellingen, Germany

Frank Volmari