Decoding of composite television signals

Details Decoding of composite television signals Decoding of composite television signals

H - Electricity

04

N

H04N 5/21 (2006.01) H04N 5/205 (2006.01) H04N 9/64 (2006.01) H04N 17/02 (2006.01)

Patent

CA 2094381

2094381 9304563 PCTABS00020 A broadcast system is provided in which the effects of differential distortions on composite television signals are reduced. At predetermined intervals, the broadcast signal includes a test signal having high frequency components at least three average video signal levels. In a suitably equipped receiver, following demodulation by the receivers vision demodulator (20), a test signal is identified by a test signal detector (34). Measurement apparatus (24) then measures the distortion of the test signal at a number of different average video signal levels, calculates the correction required to minimise the effect of distortion at each measured signal level, and stores the corrections in a memory (28) at address locations derived from the demodulated signal by a filter circuit (32). The stored corrections are applied to an interpolator (40) which derives further corrections for other average video signal levels, the derived corrections being applied to subsequently received television signals by a controllable equaliser (38).

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