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Light Sensitive Audio Gain Circuit

IP.com Disclosure Number: IPCOM000012064D
Original Publication Date: 2003-Apr-04
Included in the Prior Art Database: 2003-Apr-04
Document File: 2 page(s) / 29K

Publishing Venue

Motorola

Related People

Michael Calendine: AUTHOR [+3]

Abstract

Our design includes a photocell, or light-sensitive resistor, whose resistance varies directly with the amount of light incident on the cell. By incorporating this photocell resistor into the audio gain circuit, the volume of the speakerphone can be directly proportional to the amount of light surrounding the cell phone.

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Light Sensitive Audio Gain Circuit

Michael Calendine

Paul Faerber

Ryan Rye 

   

Abstract 

Our design includes a photocell, or light-sensitive resistor, whose resistance varies directly with the amount of light incident on the cell.  By incorporating this photocell resistor into the audio gain circuit, the volume of the speakerphone can be directly proportional to the amount of light surrounding the cell phone. 

Description

Problems Resolved: 

In general, if a cell phone is in a dark environment during normal user-operating hours (while they’re awake), it is most likely in the following surroundings:

a)       in a purse

b)       in a backpack

c)       in a suitcase or other piece of luggage

d)       being used in a dark environment that may be noisy (bar, nightclub, etc.)

e)       in unfamiliar surroundings at night (rental car, hotel room, etc.)

In these environments where visibility of the cell phone is low and the phone is either buried in luggage or on standby in a noisy environment, the conventional loudness of the ring tone may not be sufficient to alert the user to an incoming call.  Thus, in these situations, a louder ring would be able to alert the user quicker that an incoming call is present and/or would help prevent unanswered calls.

The Idea:

This idea describes a circuit whose audio gain to the speaker is inversely proportional to the amount of ambient light present around the unit.  In environments of little or no light, the phone alert tones would be louder, and vice versa in highly-li...