Kenneth J Stevens

US Patent:

6624533, Sep 23, 2003

Filed:

Aug 4, 1999

Appl. No.:

09/368200

Inventors:

Allen K. Swanson - Deham MA
Kenneth A. Stevens - Wayland MA

Assignee:

Westerbeke Corporation - Avon MA

International Classification:

H02J 700

US Classification:

307 64, 307 46, 307 65, 307 66, 307 67, 307 80

Abstract:

A power controller for controlling an engine-driven generator includes a high voltage DC bus interconnecting various power modules. In electrical communication with the DC bus are: a bi-directional DC-DC converter constructed to transfer electrical power from the DC bus to a battery to charge the battery, and from the battery to the DC bus; a rectifier constructed to rectify electrical power from the generator and to supply the rectified power to the DC bus; an inverter constructed to convert DC bus electrical power to AC electrical power and to supply the AC power to an output connector; and an AC-DC constructed to convert AC electrical power, supplied via an input connector, to DC bus electrical power. The controller may be employed in a power supply on a mobile vehicle or boat, for example. The power modules of the controller cooperate in various combinations to provide a wide variety of power transfer functions.

US Patent:

57488380, May 5, 1998

Filed:

Aug 22, 1996

Appl. No.:

8/708271

Inventors:

Kenneth N. Stevens - Cambridge MA

Assignee:

Sensimetrics Corporation - Cambridge MA

International Classification:

G10L 902

US Classification:

395 27

Abstract:

A speech synthesizing method which uses glottal modelling to determine and transform ten or fewer high level parameters into thirty-nine low level parameters using mapping relations. These parameters are inputted to a speech synthesizer to enable speech to be synthesized more simply than with prior art systems that required 50 to 60 parameters to be inputted to represent any particular speech.

US Patent:

51058227, Apr 21, 1992

Filed:

Feb 16, 1988

Appl. No.:

7/156299

Inventors:

Kenneth N. Stevens - Cambridge MA
David M. Green - Gainsville FL
Robert A. Berkovitz - Belmont MA

Assignee:

Sensimetrics Corporation - Cambridge MA

International Classification:

A61B 500

US Classification:

128746

Abstract:

An apparatus for and method of applying a selected range of high frequency acoustic energy to the apical end of the eardrum of an ear canal at a predetermined, substantially absolute sound pressure level at any frequency in the range of interest. The selected range of frequencies is generated at a location remote from the ear canal and the sound pressure level of each frequency is varied at the time of generation in accordance with a calibration function to ensure the frequencies reaching the apical end of the eardrum are at the predetermined sound pressure level. The calibration function is calculated by transmitting an acoustic pulse of broad frequency spectrum into the ear canal, measuring the sound pressure of the transmitted acoustic pulse and reflection thereof adjacent the entrance of the ear canal, and removing from the spectrum of the measured sound pressure the destructive interference effects between the transmitted and reflected acoustic pulses. The resultant sound pressure level contains nonuniformities having information regarding the sound transmission characteristics of the ear canal and the acoustic pulse generation and transmission system from which the calibration function is calculated.