Abstract: A public address system including a wireless IR microphone for picking up a sound and converting it to an IR light signal including an audio signal representative of said sound and adapted for being transmitted to an IR sensor; an IR sensor including an IR photo detector for receiving said IR light signal and a first receiver for extracting said audio signal and a first transmitter transmitting it to a base station; a base station including a second receiver for receiving said audio signal from said IR sensor and a processor for processing said audio signal to provide a processed audio signal and a second transmitter transmitting it to a loud speaker; and a loud speaker unit for receiving said processed audio signal and converting it to a processed sound signal for being presented to an audience, wherein said IR sensor and loudspeaker unit are integrated into a sensor-speaker assembly.

Abstract: This invention relates to a system for amplifying a sound in an auditory environment. The system comprises a microphone for transforming said sound to an electric sound signal; a band-pass filtering means connecting to said microphone and outputting a filtered sound signal; and an amplifier amplifying said filtered sound signal and outputting a filtered and amplified sound signal to a loudspeaker. The band-pass filtering means comprises a passive first filter having a first bandwidth and first gain, an active second filter having a second bandwidth and a second gain larger than said first gain, and an active third filter having a third bandwidth and a third gain larger than said second gain.

Abstract: A classroom sound amplification system adapted for providing information aiding at diagnosing possible erroneous or inappropriate conditions or configuration of the system is disclosed. The system comprises a microphone device converting a voice to a sound signal and connecting to a sound processing device processing the sound signal and generating a processed sound signal, and a speaker device connecting to the sound processing device and converting the processed sound signal to a processed voice. The microphone device, the sound processing device, the speaker device and one or more A/V-devices are connected to or form part of the control device allowing the control device to collect operational information concerning the operation and/or status of devices of the system by monitoring predefined operational a parameters at various points in time.

Abstract: A classroom sound amplification system adapted for providing information aiding at diagnosing possible erroneous or inappropriate conditions or configurations of the system is disclosed. The system comprises a microphone device converting a voice to a sound signal and connecting to a sound processing device processing the sound signal and generating a processed sound signal, and a speaker device connecting to the sound processing device and converting the processed sound signal to a processed voice. The sound processing device may further comprise a feedback cancellation unit identifying acoustical feedback in the sound signal and removing the acoustical feedback in the sound signal. Communication with the parts of the system carried by a moving person may be wireless.

Abstract: This invention relates to a wireless classroom sound amplification system. The system comprises a microphone device converting a voice to a sound signal and connecting to a sound processing device processing the sound signal and generating a processed sound signal, and a speaker device connecting to the sound processing device and converting the processed sound signal to a processed voice. The sound processing device further comprises a feedback cancellation unit identifying acoustical feedback in the sound signal and removing the acoustical feedback in the sound signal.

Abstract: This invention relates to a sound system and method for processing acoustical sound. The sound system comprises a microphone for converting an acoustical sound to an electrical sound signal, a processor for processing the sound signal and for generating a processed sound signal, and a speaker for converting the processed sound signal to a processed acoustical sound.

Abstract: This invention relates to a system for amplifying a sound in an auditory environment. The system comprises a microphone for transforming said sound to an electric sound signal; a band-pass filtering means connecting to said microphone and outputting a filtered sound signal; and an amplifier amplifying said filtered sound signal and outputting a filtered and amplified sound signal to a loudspeaker. The band-pass filtering means comprises a passive first filter having a first bandwidth and first gain, an active second filter having a second bandwidth and a second gain larger than said first gain, and an active third filter having a third bandwidth and a third gain larger than said second gain.