DR. DONALD RAYMOND WHITE, DC, RN
Chiropractic at Canyon Rd, Beaverton, OR

6370245, Apr 9, 2002

Dec 12, 1997

08/989816

Donald R. White - Aloha OR

Konetics, Inc. - Portland OR

H04M 162

37939004, 37938803, 37939003

Full duplex circuits provide a bi-directional signal path at one port for transmit and receive signals and also provide separation between the transmit and receive signals at their respective ports. To accomplish this, the circuits employ amplifiers arranged in either a bilateral T hybrid or balanced impedance configuration. One application is in a transducer interface, where a single transducer is used as both a speaker/ear phone and a microphone. Another application is in a telephone line interconnect, where the telephone line interface simultaneously transmits and receives electrical signals representing audio data, e. g. , voice data. The transducer interface drives a receive signal onto a transducer to create audio output while simultaneously generating a transmit signal from audio input. The telephone line interconnect drives a transmit signal through a transformer to send the transmit signal to a telephone line while simultaneously transferring a receive signal from the telephone line. In both applications, the circuits provide a bi-directional signal path (simultaneous transmit and receive signals) at one port and achieve separation of the transmit and receive signals at respective transmit and receive ports.

5907538, May 25, 1999

Feb 18, 1997

8/801525

Donald R. White - Beaverton OR

H04B 156

370276

A full duplex communication circuit uses a transducer as both a microphone and speaker/earphone to provide full duplex communication without acoustical feedback. The circuit uses a novel amplifier configuration to apply a signal received from a remote source to the transducer without loading it. The output of the transducer has a combined transmit and receive signal. To eliminate feedback of the receive signal in the output of the transmit signal, an audio processing circuit (analog) takes this combined signal and simultaneously compresses the receive signal and expands the transmit signal to produce a transmit signal that is 35-40 dB greater than the receive signal at the output.

2002018, Dec 12, 2002

Jun 7, 2001

09/878151

Masahisa Masuda - Westlinn OR, US
Donald White - Beaverton OR, US

H04R025/00

381/380000, 381/151000, 381/374000

A headset includes earpieces for attaching to ears of an operator. A band has opposite ends that connect to the two earpieces and extends in a forward direction from the two earpieces. The band then either extends downwardly below the chin or extend backwards in back of the neck. In one implementation, the headset is used for two-way communications with one earpiece containing a microphone and the other earpiece containing a speaker.

7072476, Jul 4, 2006

Jan 13, 2003

10/342102

Donald R. White - Beaverton OR, US
Masahisa Masuda - Westlinn OR, US

Matech, Inc. - Portland OR

H04R 1/10

381 74, 381328, 381 711, 370276

A headset includes two earpieces. One earpiece acts as a microphone, and the other earpiece acts as an earphone. Isolated from background noise and vibrations due to bone conduction, the microphone earpieces convert voice sounds from the air column in the external ear canal into electrical signals. Other embodiments of the invention address feedback problems and achieve improved performance relative to existing full duplex communication devices. In another embodiment of the invention a headset includes a band having opposite ends that extend in a forward direction from the two earpieces. The band then either extends downwardly or backwards.