METHOD AND APPARATUS FOR IMPROVING CLASSROOM AMPLIFICATION SYSTEMS AND OTHER RF-TYPE AMPLIFICATION SYSTEMS

摘要

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).