CONVERSION OF TONAL CHARACTER OF AURAL SIGNALS
United States Patent 3476863
US Patent References:
Quadrature axis-crossing counter
- - 3094666


Inventors:
Campbell, Donald J.
Publication Date:
11/04/1969
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Assignee:
CHICAGO MUSICAL INSTR CO
Primary Class:
84/681
Other Classes:
327/58
International Classes:
G10L21/00; G10H1/00; H03K5/01




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