SILENT MODE ALERT FUNCTION RECOGNITION VIA MODULATION OF PULSATING VIBRATIONS
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-13
Mechanical vibrations are commonly used as silent alert means in pagers. Most of the existing art electrical vibrators used in pagers are driven to produce uninterrupted vibrations. This serves the purpose of alerting the user that a message has been received, but the user must then observe a display or listen to audible alerts to determine the source of the message. The utilization of the modulation of a wntinuous vibrator for energy conservation purposes has been previously disclosed.