Dynamic magnetic information storage or retrieval – Head – Core
Patent
1977-03-30
1979-09-25
Konick, Bernard
Dynamic magnetic information storage or retrieval
Head
Core
360 67, 360 27, 1791003D, 179 15AV, 333 14, 325 62, G11B 700, H04B 164
Patent
active
041692195
ABSTRACT:
An information signal is compressively encoded for application to a limited amplitude transmission channel, such as a cinemagraphic film, by generating a gain control signal which represents the information signal level, delaying the information signal until the gain control signal has been substantially generated, and using the gain control signal to control encoding of the delayed information signal. The encoded information signal may be transmitted by itself with a similar delay step employed to decode it after reception, or the gain control signal may be transmitted along with the information signal and employed in the decoding operation, thereby avoiding the need for a delay step in the decoding process. In the latter case the gain control signal may be encoded along with the information signal, and employed in a feedback control loop for the encoding process.
The invention also includes apparatus designed to perform the disclosed method.
REFERENCES:
patent: 2221681 (1940-11-01), Schlegel
patent: 3379839 (1969-04-01), Bennett
patent: 3518578 (1970-06-01), Oppenheim
patent: 3619511 (1971-11-01), Ishikawa
patent: 3631365 (1971-12-01), Dolby
patent: 3769611 (1973-10-01), Scaggs
patent: 3879674 (1975-04-01), Dragon
patent: 3885111 (1975-05-01), Ishigami
Faber Alan
Konick Bernard
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