Method and apparatus for magnetically recording and reproducing

Details Method and apparatus for magnetically recording and reproducing Method and apparatus for magnetically recording and reproducing

1976-06-16

1978-05-02

Lucas, Jay P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 43, G11B 509

Patent

active

040878406

ABSTRACT:
Disclosed are a method and an apparatus for magnetically recording and reproducing physiological information such as in an electrocardiogram. The ECG signal is pulse width modulated (PWM), and the transition points, or zero crossings are stored on magnetic tape. The original PWM signal is then reproduced from the output of the playback head by reacting to the simultaneous occurrence of zero crossings and large magnitude derivative signals. Also disclosed is the concept of automatically reacting to recorded audible information during the reconstruction of the original PWM signal.

REFERENCES:
patent: 3562724 (1971-02-01), Adler
patent: 3699554 (1972-10-01), Jones
patent: 3719934 (1973-03-01), Behr et al.
patent: 3761906 (1973-09-01), Finster et al.

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