Title:
Identification of sound and like signals
United States Patent 3004104
US Patent References:
Carrier-wave transmission
- - 1724938

Composite set
- - 2116172

Communication system
- - 2335335

Two-way telephone and telegraph system
- - 2352918

Signaling system
- - 2376275


Inventors:
Frank, Hembrooke Emil
Publication Date:
10/10/1961
View Patent Images:
Download PDF 3004104 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
MUZAK CORP
Primary Class:
341/182
Other Classes:
360/60, 360/22, 381/98, 369/47.260, 455/39, 360/15
International Classes:
G01H3/00; G11B20/00
US Patent References:
2398755Communication system
2406034Carrier wave signaling system
2474191Tone control
2503701Simplexed line circuit system for remote-control systems
2580973Pulse signaling means
2636936Television secrecy system