Browse Prior Art Database

MOTOR DEACTIVATION VIA AMBIENT VIBRATION SENSING

IP.com Disclosure Number: IPCOM000006229D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2001-Dec-17
Document File: 2 page(s) / 87K

Publishing Venue

Motorola

Related People

Charles Hahs: AUTHOR [+2]

Abstract

Current pagers contain a microprocessor for receiving and processing radio signals and generating the information display. The receiver amplifies and demodulates the incoming signal, and the decoder compares it to the code number assigned to the pager. If the incoming signal and code number coincide, the decoder alerts the user. The alerting mode is pre- selected by the User, and can be a combination of visual and audible, or visual and silent (vibration) modes.

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MOTOROLA INC. Technical Developments Volume 13 July 1991

MOTOR DEA'CTIVATION VIA AMBIENT VIBRATION SENSING

by Charles Hahs and Stefan Peana

  Current pagers contain a microprocessor for receiving and processing radio signals and generating the information display. The receiver amplifies and demodulates the incoming signal, and the decoder compares it to the code number assigned to the pager. If the incoming signal and code number coincide, the decoder alerts the user. The alerting mode is pre- selected by the User, and can be a combination of visual and audible, or visual and silent (vibration) modes.

  Selection of the silent mode results in higher CUT- rent drain than the audible or visual alert modes and therefore results in shorter battery life. To increase battery life, it is desirable to minimize the use of the silent mode, therefore a microprocessor is used to select the alert mode based on the environmental inputs. An accelerometer is built into the pager to sense the pager motion and inform the microprocessor when the pager is being worn.

PROPOSED APPROACHES

  By giving the microprocessor the capability to select the alert mode based on environmental inputs (pager motion sensed by an accelerometer) additional current drain can be saved as described below.

APPROACH #I

  When a message is received, the microprocessor checks the accelerometer output. When motion is pre- sent the silent mode is activated. When motion is absent the silent mode is deactivated. When the out- put is low and the pager is within the preprogrammed time (ex: 9 a.m. to 5 p.m.) the microprocessor switches from the silent mode to an audible mode or the message is stored into the memory. If the message is stored the reminder function is used to alert the user.

  The micropro...