Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1982-02-22
1984-09-25
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
360 44, G11B 509
Patent
active
044738510
ABSTRACT:
Digital data is recorded onto a cassette tape by utilizing an audio cassette tape recorder under the control by a microprocessor. The microprocessor assigns "0" digital data bit a time sequence of a shorter pulse of a single period (T.sub.1) and having a duty cycle of 50% and a longer pulse of a single period (T.sub.2) and having a duty cycle of 50%. Assigned to "1" data bit is a time sequence of a single period of T.sub.2 pulse and a single period of T.sub.1 pulse. An analog signal applied to the recording unit of the audio cassette tape recorder initiates a gradual increase in its level at a point of transition from the low level L to the high level H of either T.sub.1 or T.sub.2 pulse, and returns to a start level at a point of transition from the H to the L level and also initiates a gradual decrease in the level. In this manner, a waveform conversion is performed. As a result of such waveform conversion, a signal reproduced from the cassette tape has a waveform which can be easily determined to represent either one of the binary data bits. The use of pulses having duty cycles of 50% as reference waves minimizes a level fluctuation in the reproduced signal which may be caused by a time constant of the reproducing unit of the tape recorder.
REFERENCES:
patent: 2954267 (1960-09-01), Canepa
patent: 3789139 (1974-01-01), Negishi
patent: 4340913 (1982-07-01), Cave
Kawai Taneichi
Nagura Nobuyoshi
Aisin Seiki Kabushiki Kaisha
Canney Vincent P.
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