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AUTOMATIC ALERT/VOICE ADJUSTMENT BASED UPON AMBIENT NOISE LEVEL

IP.com Disclosure Number: IPCOM000005672D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2001-Oct-25
Document File: 2 page(s) / 108K

Publishing Venue

Motorola

Related People

Lynne D. Klaczak: AUTHOR [+2]

Abstract

Pocket pagers as well as other types of portable receivers are required to operate in environments with various audio noise levels ranging from a quiet meeting room to a noisy industrial facility. At present, most of these products require the user to manually set the alert and/or voice volume level. Some improvements to this technology have been made in recent years such as ESCALERT (a patented Motorola pager feature), in which the alert tone is gradually increased from a low setting to the maximum level or until the user hears the alert and resets the radio. However, ESCALERT is used only on tone only and data functions, because with voice messages there is insufficient time between the start of an alert and the voice message to permit this gradual increase in volume level.

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MOlOROLA Technical Developments Volume 7 October 1987

AUTOMATIC ALERT/VOICE ADJUSTMENT BASED UPON AMBIENT NOISE LEVEL

by Lynne D. Klaczak and Leonard E. Nelson

   Pocket pagers as well as other types of portable receivers are required to operate in environments with various audio noise levels ranging from a quiet meeting room to a noisy industrial facility. At present, most of these products require the user to manually set the alert and/or voice volume level. Some improvements to this technology have been made in recent years such as ESCALERT (a patented Motorola pager feature), in which the alert tone is gradually increased from a low setting to the maximum level or until the user hears the alert and resets the radio. However, ESCALERT is used only on tone only and data functions, because with voice messages there is insufficient time between the start of an alert and the voice message to permit this gradual increase in volume level.

   The purpose of this invention is to monitor the ambient nose level present in the environment, and based upon this level, automatically adjust the volume level to ensure adequate alert tone and voice volume level for the person receiving the communication. As products become smaller and provide more complicated features, it is also important to minimize the number of radio control responsibilities. This invention will provide to the user the most effective and efficient alert tone and voice volume level for their environment.

   Shown in Figure 1 is a block diagram of the invention which can be used to adjust the volume level in a paging receiver as a function of the ambient noise level. At high ambient noise levels the digitally controlled electronic attenuator 4 is set for minimum attentuation, and,at low noise levels the attenuation is increased to keep the audio level comfortably above the ambient noise level, so far as is possible, over a wide range of conditions.

   Operation of the circuit can be explained by referring to Figures 1 and 2. In Figure 1 the antenna and receiver 1 pick up, amplify, and demodulate the RF signal to produce an audio output. The audio output of the receiver is routed to the paging decoder 2, typically a microcomputer, and to one side of a multiplexer switch 3. The paging decoder 2 examines the received audio information looking for a unique selective calling signal or ad- dress assigned to the pager. If the paging decoder recognizes its particular address, it will generate an alert tone and route the...