Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1989-05-19
1992-06-09
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
360 27, 360 331, G11B 5035, G11B 502, H04N 578
Patent
active
051212668
ABSTRACT:
A reproducing circuit for use in a magnetic recording and reproducing apparatus having a recording circuit operable to record a video luminance signal in either a conventional recording mode or in a High-Band mode has a first automatic gain control circuit for holding a level of a reproduced FM signal at an input thereof constant, a recording mode determination circuit having an input connected to the first automatic gain control circuit and responsive to an output of the first automatic gain control circuit for determining which the first or second recording mode is used to record the FM signal under reproduction, a first equalizer circuit for equalizing the reproduced FM signal suitably for the first recording mode, a second equalizer circuit for equalizing the reproduced FM signal suitably for the second recording mode, a switch circuit for selecting an output of either the first equalizer circuit or the second equalizer circuit according to an output of the recording mode determination circuit, a second automatic gain control circuit for holding an output level of the switch circuit, whereby the recording mode of the signal undergoing reproduction is automatically determined and the characteristics of the reproducing circuit is changed automatically suitably.
REFERENCES:
patent: 4786986 (1988-11-01), Yamanushi et al.
Ito Yoichi
Ohtsuka Susumu
Yamanushi Fumihiko
Yoshioka Atsushi
Hitachi , Ltd.
Kim Won Tae C.
Psitos Aristotelis
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