Title:
PULSE CODE MODULATION RECORDER
Document Type and Number:
Japanese Patent JPS5228232
Kind Code:
A
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.
Inventors:
PIITAA FUANNCHIENGU CHIYUU
Application Number:
JP10252276A
Publication Date:
March 03, 1977
Filing Date:
August 27, 1976
Export Citation:
Assignee:
HEWLETT PACKARD YOKOGAWA
International Classes:
G11B20/10; G11B20/14; (IPC1-7): G06K1/12; G11B5/008