H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/20
H03D 3/00 (2006.01) H03G 5/24 (2006.01)
Patent
CA 1190289
ABSTRACT The threshold level for demodulating an FM signal, for instance a television picture signal, has been improved or lowered by adaptively restricting the bandwidth of the signal using an adaptive bandpass filter, and therefore, the picture quality and/or S/N ratio of the demodulated television signal has been improved. The adaptive bandpass filter has enough bandwidth when the signal level is sufficiently higher than the threshold level, but is narrow when the signal level is close to or lower than the threshold level. The bandwidth of the adaptive bandpass filter is adjusted according to the total power of the input FM signal and C/N (ratio of the carrier-signal to noise) ratio. The improvement of the threshold level is almost 2 dB.
400870
Konishi Yoshihiro
Ohta Tomozo
Tsutsumi Yoshio
Borden Ladner Gervais Llp
Nippon Hoso Kyokai
Oki Electric Industry Co. Ltd.
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