Title:
COMMUNICATION SYSTEM
Document Type and Number:
WIPO Patent Application WO1987003501
Kind Code:
A3
Abstract:
PCT No. PCT/GB86/00762 Sec. 371 Date Jun. 2, 1988 Sec. 102(e) Date Jun. 2, 1988 PCT Filed Dec. 15, 1986 PCT Pub. No. WO87/03501 PCT Pub. Date Jun. 18, 1987.An audio signal and a selected one of a plurality of sub-audio tones are transmitted to a plurality of receiving each being capable of being conditioned by first, second or third selected sub-audio tones so that either all receivers, or only a select group of all of the receivers or only an intended group are the receivers accept the transmitted audio signal, there being as many selectable second sub-audio signals as there are groups and as many selectable third sub-audio signals as there are receivers.
Inventors:
LEATHER TERENCE HENRY (GB)
NAYLOR FRANK RAYMOND (GB)
GRADWELL PAUL STEPHEN (GB)
NAYLOR FRANK RAYMOND (GB)
GRADWELL PAUL STEPHEN (GB)
Application Number:
PCT/GB1986/000762
Publication Date:
August 13, 1987
Filing Date:
December 15, 1986
Export Citation:
Assignee:
LEATHER TERENCE HENRY (GB)
NAYLOR FRANK RAYMOND (GB)
GRADWELL PAUL STEPHEN (GB)
NAYLOR FRANK RAYMOND (GB)
GRADWELL PAUL STEPHEN (GB)
International Classes:
A42B1/12; A63B71/06; A63B69/00; A63B69/12; H04B5/00; (IPC1-7): A63B69/00
Foreign References:
| DE2221767A1 | 1973-11-15 | |||
| DE1184252B | 1964-12-23 | |||
| DE2817195A1 | 1979-10-31 |
Other References:
See also references of EP 0281564A1
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