Title:
METHOD AND APPARATUS FOR IMPROVING CLASSROOM AMPLIFICATION SYSTEMS AND OTHER RF-TYPE AMPLIFICATION SYSTEMS
Document Type and Number:
WIPO Patent Application WO1998056106
Kind Code:
A3
Abstract:
An RF type amplification system that employs a cordless telephone. The amplification system includes a portable unit (87) and a base unit (82). Portable unit (87) includes: a microphone (151); a transmitter (160, 161) which generates RF signals containing voice and control signals; a processing unit (179); and antenna (168) for transmitting and receiving signals from the base unit (82). Base unit (82) includes an antenna (107), a receiver (108, 114, 115, 117). Control signals are identified and evaluated by a CPU (130). Voice signals are processed through a speech network (121) and provided to an audio power amplifier (147) which supplies it to speakers that audibly project the voice signals. Base unit (82) further includes a transmitter (133, 135) for generating RF signals containing control but no voice signals, that are transmitted to the portable unit (87), thereby effecting one-way transmission of voice signals and two-way transmission of control signals between portable unit (87) and base unit (82).
Inventors:
FRANKLIN DAVID (US)
STEELE MICHAEL (US)
STEELE MICHAEL (US)
Application Number:
PCT/US1998/011127
Publication Date:
April 15, 1999
Filing Date:
June 02, 1998
Export Citation:
Assignee:
AUDIOLOGICAL ENGINEERING CORP (US)
FRANKLIN DAVID (US)
STEELE MICHAEL (US)
FRANKLIN DAVID (US)
STEELE MICHAEL (US)
International Classes:
G09B5/10; G09B21/00; H04H20/61; H04H20/76; H04M1/72502; H04R25/00; H04W28/04; (IPC1-7): H04Q7/32; G08B3/10
Foreign References:
| US5818328A | 1998-10-06 | |||
| US5850601A | 1998-12-15 |
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