H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/81
H04N 5/21 (2006.01)
Patent
CA 1194593
ABSTRACT OF THE DISCLOSURE A ghost cancelling system having a signal input terminal for receiving an input signal which includes desired and ghost signals, a transversal filter connected to the signal input terminal and responsive to the desired signal for forming a waveform corresponding to the ghost signal, the transversal filter including a weighting circuit and a memory having a storage capacitor for storing the weighting function for the weighting circuit, a subtracter connected between the signal input terminal and the transversal filter for subtracting an output of the transversal filter from the input signal, a ghost detector connected between the output terminal of the subtracter and the memory for detecting a level of the ghost signal to control the memory such that the weighting function changes in response to the detected level, a signal output terminal connected to the output terminal of the subtracter, a power responsive circuit for detecting the time when a power switch is turned on, and an activating circuit con- nected between the power responsive circuit and the storage capacitor for charging the latter during a predetermined period when the power switch is turned on.
422718
Saito Junya
Tsutsui Ichiro
Yamada Hisafumi
Gowling Lafleur Henderson Llp
Sony Corporation
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