Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1984-12-19
1987-01-13
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 33, 307351, 307355, 328147, 328150, G11B 2110, H03K 5153
Patent
active
046370030
ABSTRACT:
A high frequency signal detection device to be used in an information playback system for playing back signals from a record medium having a plurality of record tracks, includes first and second positive peak hold circuits having different time constant and a negative peak hold circuit. A difference circuit is provided to generate a difference signal between output signals of the first positive peak hold circuit and the negative peak hold circuit and an output signal of the difference circuit is compared with an output signal of the second positive peak hold circuit, to produce a high frequency signal detection signal. Thus, a very accurate detection signal is produced irrespective of the polarity of the input signal and whether or not the envelope of the high frequency signal is symmetric.
REFERENCES:
patent: 3893180 (1975-07-01), Braun et al.
patent: 4093832 (1978-06-01), Isaacson et al.
patent: 4156202 (1979-05-01), Takahashi
patent: 4219152 (1980-08-01), Couch et al.
patent: 4241455 (1980-12-01), Eibner
Garland Steven R.
Pioneer Electronic Corporation
Psitos Aristotelis M.
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