Sound outputting devices using digital displacement data for a P

Details Sound outputting devices using digital displacement data for a P Sound outputting devices using digital displacement data for a P

1992-07-14

1995-04-18

MacDonald, Allen R.

395 21, G10L 900

Patent

active

054085837

ABSTRACT:
Sound information is binarized by delta modulation or adaptive delta modulation. The resulting data is subjected to pulse wide modulation and the resulting data is delivered to a reproducing device, which detects a leading edge of a received signal pulse to produce a self operation timing clock to thereby reproduce a sound. When the reproducing device detects the absence of edges for a predetermined interval after the edge detection, it turns off a power source for an analog circuit to suppress power consumption.

REFERENCES:
patent: 4658369 (1987-04-01), Sugiura
patent: 4905003 (1990-02-01), Helferich

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