Dynamic magnetic information storage or retrieval – Head – Core
Patent
1979-04-11
1980-09-09
Olms, Douglas W.
Dynamic magnetic information storage or retrieval
Head
Core
360 38, 358 8, H04S 100, H04N 576
Patent
active
042219302
ABSTRACT:
In systems which process frequency modulated carrier waves, such as video disc systems, video tape recorder/playback systems and radio systems, there are occasions where the FM signal suddenly drops to a low level. In the case of FM audio signals, these sudden drops result in objectionable tics and pops in the demodulated audio output. The apparatus described herein reduces these objectionable noises by utilizing a variable impedance in connection with a deemphasis circuit in the main signal path. Upon the occurrence of a signal dropout, a defect indication signal is provided to the variable impedance device. The deemphasis circuit has an overall time constant which includes the variable impedance device and which varies in accordance with the detected signal dropouts so as to provide a substantially smooth demodulated output signal whereby tics and pops, in the output audio signal, are substantially removed.
REFERENCES:
patent: 3909518 (1975-09-01), Baker
patent: 3912858 (1975-10-01), Kenney
patent: 3925811 (1975-12-01), Kenney
patent: 4119812 (1978-10-01), Fox
patent: 4158855 (1979-06-01), Thomas et al.
Phillips Technical Revue, vol. 33 No. 7, pp. 181-185, 1973.
Olms Douglas W.
RCA Corporation
Tripoli J. S.
Whitacre E. M.
LandOfFree
FM Defect compensation apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with FM Defect compensation apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FM Defect compensation apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2225355