Decoding and recoding composite digital television signals

Details Decoding and recoding composite digital television signals Decoding and recoding composite digital television signals

H - Electricity

04

N

352/18, 352/50,

H04N 5/76 (2006.01) H04N 9/804 (2006.01) H04N 11/04 (2006.01) H04N 11/16 (2006.01)

Patent

CA 1154536

ABSTRACT OF THE DISCLOSURE A decoder-recoder arrangement for decoding a composite digital television signal for recording on a digital video recorder and for subsequently recoding the reproduced signal, the arrangement comprising a decoder including filters for separating two chrominance components from the composite digital television signal, demodulators for demodulating the chrominance components, sample rate reducers for reducing the sample rates of the demodulated chrominance components, interpolators for interpolating samples into the sample-reduced demodulated chrominance components to restore the sample rate to the original value, modulators for remodulating the interpolated chrominance components, an adder for adding together the modulated interpolated chrominance components, and a subtractor for subtracting the output of the adder from the input composite digital television signal; and a recoder including interpolators for interpolating samples into said sample-reduced demodulated chrominance components to restore the sample rate to the original sample value, modulators for modulating the interpolated chrominance components obtained from the interpolators, an adder for adding together the outputs of the modulators, and a further adder for adding the output of the adder to the output of the subtractor of the decoder to derive the original composite digital television signal.

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