U.S. Philips Corporation

Rolf-Dieter Gutsmann

Hartmut Hackmann

Walter H Demmer

Otto L Warmuth

Leo Warmuth

Siegfried Bohme

Jens Rennert

Kurt-Joachim Johannes

Detlef Deutschmann

For a method of encoding digital data of arbitrary data rates of at least one data signal for jointly transmitting the encoded data with a digital picture signal, as well as a data encoder for such data, a flexible adaptation to different data formats is provided in which, in the encoding of data, at least parts of the edges of data bits of the data signal are replaced by synthetically generated amplitude values constitutes edges which are within the bandwidth limitations predetermined for the encoded data bits.

Digital encoding method and apparatus for replacing part of the data signal with synthetically generated amplitude values

At least a first and a second digital signal, both in parallel form, are converted to a single serial signal and transmitted from a digital color decoder to a signal processing unit so as to avoid picture disturbances in the signal processing unit. The first digital signal is dependent on the instantaneous value of a clock frequency used in the decoder for processing a digital color picture signal, and the second digital signal is dependent on the instantaneous value of a chrominance subcarrier frequency generated in the decoder and used for color decoding.

Data transmission method

The invention relates to a digital low-pass filter which effects a frequency reduction by a factor which is equal to the ratio w/2 between the frequency of the input signal and the frequency of the output signal, wherein w is an odd integer. The input signal is applied to m series-arranged registers. The input signal of the first and the output signals of all the registers are multiplied by coefficients. A change-over switch precedes an input of each multiplier, the change-over switch switching the coefficients symmetrically. The switching instants are always symmetrical relative to a reference sampling instant. The filter is particularly suitable for use in video signal processing, to reduce negative influences of an analog-to-digital converter.

Digital low-pass filter with improved frequency reduction characteristics

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Hamburg, Germany

Rolf-Dieter Gutsmann