Patent ID: 6320622
Filing Date: 2001-11-20
Classification: H04N

Abstract:
A digital de-emphasis filter for a SECAM decoder and for converting a sequence of input image data into filtered image data, the filter comprising:a recursion register for storing an auxiliary value obtained from an input image data value;an arithmetic circuit configured to use the auxiliary value and a new image data value to generate a new auxiliary value and a filtered image data value;a device for storing and outputting a value representative of an estimated value of an achromatic value of a SECAM signal; anda first switch for applying the value output by said device into said recursion register to obtain a registered value at the beginning of each burst gate period of the SECAM signal;said arithmetic circuit configured to use the registered value and at least one value of the burst signal of the SECAM signal to output an estimated value that is updated using the value of the burst signal.