Christopher S Perkins

US Patent:

20120288120, Nov 15, 2012

Filed:

May 13, 2011

Appl. No.:

13/107267

Inventors:

Michael Nussbaum - Newton MA, US
Zoran Coric - Framingham MA, US
Christopher J. Perkins - Shrewsbury MA, US
Timothy W. Sheen - Brighton MA, US

Assignee:

Bose Corporation - Framingham MA

International Classification:

H03G 3/00
H03F 99/00

US Classification:

381107, 381120, 381121

Abstract:

An apparatus for driving speakers includes user-configurable amplifier cells for driving selected speakers, a synchronous rectifier circuit, and a control system. Each cell connects between power rails. The rectifier circuit provides current on the rails for consumption by the cells. The current depends on the configuration. The control system implements a model of the rectifier circuit and cells and uses it to control an audio input signal in response to information concerning electrical outputs of the amplifier cells. This indirectly limits current drawn from the synchronous rectifier circuit.

US Patent:

20210391839, Dec 16, 2021

Filed:

Dec 9, 2020

Appl. No.:

17/116105

Inventors:

- Framingham MA, US
Robert John Currie - Framingham MA, US
Christopher J. Perkins - Shrewsbury MA, US
Thomas S. Daly - Northborough MA, US
Craig Small - Framingham MA, US

International Classification:

H03G 3/30
G06F 3/16
H04R 3/00
G06F 3/0481
H03F 3/183

Abstract:

A system for controlling the gain of an input signal in an audio signal amplifier. The system includes a user-operable gain control, and analog and digital circuit elements that together are configured to modify the gain of the input signal in response to the user-operable gain control.