H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/81
H04N 5/21 (2006.01)
Patent
CA 2001484
A ghost canceller comprising means for deriving a digital first signal by converting the waveform of or extracting a signal of a predetermined period of time such as a pulse-like signal to be used for detecting a ghost, means for detecting the position in the time axis of a peak of the first signal and generating a signal having a reference waveform at the time corresponding to the detected position on the time axis of the peak, a subtracting means for obtaining a second signal by inputting the first signal and the signal having the reference waveform and subtracting the signal having the reference waveform from the first signal, a variable amplifier for controlling the value of the second signal data, means for obtaining a criterion function by calculating mean square value of the second signal data or averaging the sum of absolute values of the second signal data, an amplification factor setting means for setting an amplification factor corresponding to the value of the criterion function only in case where the value of the criterion function is less than the value .beta. times a minimum value of the criterion function ( .beta. is a predetermined value greater than 1) obtained prior to a predetermined time and means for setting the value of the criterion function as the minimum value of the criterion function only in case where the value of the criterion function is less than the minimum value thereof obtained prior to a predetermined time, wherein a ghost cancelling operation is performed by controlling a gain of a variable amplifier used to control the value of the second signal data by the amplification factor setting means.
Ebihara Kazuyuki
Ito Shigehiro
Kouguchi Tatsushi
Nishi Yuji
Robic
Victor Company Of Japan Ltd.
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