Pulse code modulation recording and/or reproducing system

Details Pulse code modulation recording and/or reproducing system Pulse code modulation recording and/or reproducing system

1975-08-27

1977-04-12

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

040179036

ABSTRACT:
A system for high-density data recording at low tape speeds receives a unipolar signal representing encoded digital data and transforms it to a bipolar signal having a constant pulse width. The low-frequency response required of the system is minimized because the power spectrum of the signal is altered through a time domain transformation. The narrow bandwidth enables the use of very low tape speeds at high bit packing densities. Tape speeds of 15/32 ips or less at densities about 20 thousand (k) bits per inch (BPI) are possible. The spectrum of the transformed code has no direct current (DC) component which eliminates the need for a base line compensator in the reproducing portion of the system.

REFERENCES:
patent: 3108265 (1963-10-01), Moe
patent: 3641524 (1972-02-01), Norris
patent: 3852809 (1974-12-01), Coker, Jr.
patent: 3921210 (1975-11-01), Halpern

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