Speaker Transducer for Mobile User Input via Impedance
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Solution Overview
Problem
Mobile devices face challenges in providing intuitive and simple user input methods due to their small size, which complicates operations like muting audio during calls or music playback, and incorporating physical switches is difficult in shrinking devices.
Innovation Solution
Utilizing a speaker as a transducer to detect user input through changes in impedance and resonance frequency, allowing for commands like play, pause, mute, and volume control by monitoring voltage and current signals, enabling alternative input methods without additional physical switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If physical switches are built into the mobile device, then user input options are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The speaker is designed to perform multiple functions: it serves as both an audio output device and an input sensing device. By detecting changes in acoustic characteristics when covered or tapped, the speaker enables user input without requiring separate physical switches, thus reducing device complexity while maintaining ease of operation.
Solution Approach 2:
The speaker system detects user input through its own acoustic characteristics changing when covered or tapped. The monitoring circuit detects these changes in the speaker's own sound properties, allowing the speaker to serve as both the output device and the sensing mechanism, eliminating the need for additional dedicated input components.
2Ease of operation
If dedicated hardware buttons are added, then user input capability is improved, but device dimensions and thickness increase
Solution Approach 1:
The speaker serves dual purposes as both audio output and input sensing component. By utilizing the speaker's existing structure and acoustic properties for detecting user input (through covering or tapping), the device avoids adding separate hardware buttons that would increase thickness, thereby maintaining compact dimensions while improving user input capability.
3Device complexity
If touchscreen display is used for all interactions, then device simplicity is maintained, but operation complexity increases due to multiple steps required
Solution Approach 1:
The invention replaces complex multi-step touchscreen operations with simpler direct physical interactions. Instead of requiring users to navigate through multiple touchscreen menus and buttons to mute or control audio, users can simply cover or tap the speaker, providing direct and intuitive control that reduces operational complexity.
Solution Approach 2:
The speaker acts as an intermediary between the user and the audio control function. By detecting physical interactions (covering or tapping) on the speaker and translating them into control commands, the speaker provides a direct and simple interface that eliminates the need for complex touchscreen navigation sequences.
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
This approach allows for intuitive user input on mobile devices without the need for additional physical switches, enabling thinner and lighter designs while reducing power consumption by minimizing touchscreen interaction.
Implementation Method 1
A speaker's impedance and/or resonance frequency may be modified by placing an object in the radiation field of the speaker
Implementation Method 2
A speaker's resonance frequency may be modified by covering the housing of the speaker
Data Source
AI summary
Commands for modifying audio playback, such as to mute and unmute or pause and play audio, may be input to a mobile device by a user through interacting with the speaker in the device. The user input may be facilitated by monitoring a characteristic of the speaker and identifying signatures in the changing characteristics of the speaker that correspond with predetermined user activities. For example, a resonance frequency of the speaker may be monitored for a change resulting from a user placing a hand to cover the speaker output. When the resonance frequency change is detected, the audio playback may be muted. The speaker may continue to be monitored for a change indicating removal of the user's hand, and then audio playback may be unmuted.