Single Transducer Alerting System with Mode Switching

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Solution Overview

Problem

Communication devices face challenges in reducing size while maintaining functionality, as traditional two-transducer systems occupy valuable space, and single transducers used in both speaker and microphone modes risk harming users if not properly managed.

Innovation Solution

An alerting system utilizing a single transducer and an electromechanical switch that couples the transducer to different components of the device depending on the operating mode, ensuring safe and efficient audio conversion in both speaker and microphone modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a single transducer is used for both speaker and microphone functions, then device size is reduced, but user safety is compromised due to risk of ear damage

Engineering Contradiction:

Improvedevice sizeVSAvoidear damage risk

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The transducer's operational state is dynamically changed based on usage context. The system switches between speaker mode (lower power) and microphone mode (higher power) to adapt the transducer's output characteristics to the current operational requirements, thereby preventing ear damage while maintaining compact size

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters of the single transducer based on the detected mode. In speaker mode, the transducer operates at lower power levels safe for ear proximity, while in microphone mode it operates at higher power levels appropriate for distance operation, thus resolving the safety issue

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If traditional two-transducer system is used, then user safety is maintained, but device size increases

Engineering Contradiction:

Improveear damage riskVSAvoiddevice size

Core Design Contradiction:

Object-affected harmful factorsVSVolume of moving object

Solution Approach 1:

A single transducer is designed to perform multiple functions (both speaker and microphone operations) by changing its operational parameters. This multi-functionality eliminates the need for separate transducers while maintaining safety through mode-appropriate power levels

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The speaker and microphone transducer functions are merged into a single transducer component. The system combines these previously separate functions into one unified component that can operate in different modes, thereby reducing device size while implementing safety controls

Inventive Principle:

Principle #5Merging (Combining)

3Measurement precision

If transducer operates in high power mode, then microphone sensitivity is improved, but ear safety is compromised

Engineering Contradiction:

Improvemicrophone sensitivityVSAvoidear damage risk

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The transducer's power output is dynamically adjusted based on the operational mode. The system detects whether it is functioning as a speaker or microphone and automatically adjusts the power level accordingly, achieving high sensitivity when needed while preventing ear damage

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables smaller, thinner communication devices with increased functionality by using a single transducer that can operate in multiple modes without harming the user, as the transducer is safely coupled to different components based on the mode of operation, optimizing space and reducing the risk of ear damage.

Implementation Method 1

One transducer performs the function of a microphone (to convert the audio voice of a caller into electrical impulses) and another transducer performs the function of an earpiece (to convert the electrical impulses into audible sound)

Methodology Applied

Scientific EffectElectromagnetic transduction:

Implementation Method 2

One transducer performs the function of a microphone (to convert the audio voice of a caller into electrical impulses)

Methodology Applied

Scientific EffectAcoustic transduction:

Data Source

PatentUS7605686B2Alerting system for a communication device

Publication Date: 2009.10.20 MOTOROLA SOLUTIONS INC

AI summary

An alerting system (202) for a communication device (100) is provided. The alerting system is designed to operate in a plurality of operating modes. The alerting system includes a transducer (204) and an electromechanical switch (106). The transducer transforms electrical impulses into vibrations. The electromechanical switch couples the transducer to a first component (206) of the communication device in a first operating mode. Further, the electromechanical switch couples the transducers to a second component (208) of the communication device in a second operating mode.