Dynamic magnetic information storage or retrieval – Converting an analog signal to digital form for recording;...
Patent
1980-05-13
1982-09-07
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Converting an analog signal to digital form for recording;...
360 51, 360 73, G11B 500, G11B 509
Patent
active
043486991
ABSTRACT:
An apparatus for recording and/or reproducing a serial digitized analog signal controls the transport speed of a recording medium according to the sampling rate employed in digitizing the analog signal to produce a constant data density on the recording medium regardless of the sampling rate selected. The frequency of a fundamental clock signal establishes the sampling frequency during recording. A coded timing signal also recorded on the recording medium includes both a sync signal and a coded identity of the sampling frequency in use. During reproduction, the coded identity of the sampling frequency is used to select the same fundamental clock signal as was used during recording and the reproduced sync signal is phase compared with a reference signal derived from the fundamental clock signal to correspondingly control the speed and phase of transport of the recording medium. The fundamental clock signal may be manually varied during reproduction for pitch control of the reproduced analog signal.
REFERENCES:
patent: 3982277 (1976-09-01), Waylor
patent: 4222079 (1980-09-01), Onishi et al.
patent: 4224642 (1980-09-01), Mawatari et al.
Kanai Chiaki
Sonoda Takenori
Tanaka Masato
Tsuchiya Yoshikazu
Watanabe Nobuhiko
Canney Vincent P.
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
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