Texas Instruments Corporation

Sensorcom Limited

Kendall Castor-Perry

Tarik Zukic

Fred J Shipley

Ian Edmund Munro

A communication system comprises a transmitter unit () arranged to be carried by or located near a user, and an earpiece including a receiver unit (), the system operating with a carrier frequency of less than 100 kHz, preferably less than 30 kHz, most preferably in the range 14 to 20 kHz. The system employs vestigial sideband modulation by cutting off part of an upper sideband. The received signal is digitized and then sampled to an envelope-tracking sampled-data root-filter square detector () configured as a digital signal processor.

Communications system

A circuit for power amplification for an audio amplifier that reduces power supply noise amplified to the load. The circuit takes the prior art circuit's existing output coupling cap and power supply decoupling cap and connecting them in series from the power supply to ground. The output of the amplifier is then directly coupled to the load and the other side of the load is connected at the &ldquo;null point&rdquo; between the two capacitors.

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London, United Kingdom

Kendall Castor-Perry