Expandable Display Audio Filtering for Motor Noise Interference
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Solution Overview
Problem
Electronic devices with expandable displays face the challenge of motor-induced noise interference with the microphone when changing display states, which can disrupt audio communication or recording.
Innovation Solution
Implementing a filter to remove the frequency of motor-induced noise from the microphone signal, adjusting pulse width modulation (PWM) to avoid overlapping with human voice frequencies, and applying filters specific to the display state changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a motor is used to change the display state, then the display can be expanded or contracted automatically, but motor-induced noise interferes with the microphone
Solution Approach 1:
The patent detects motor operating frequencies and uses this information to identify and filter out motor noise from microphone signals. The harmful motor noise is converted into a detectable pattern that can be systematically removed through frequency-based filtering, allowing both motor-driven display control and clear audio capture to coexist
Solution Approach 2:
The patent introduces a signal processing intermediary system that sits between the microphone and the audio output. This intermediary detects motor operating states and applies frequency filtering to remove motor noise while preserving voice signals, effectively mediating between the motor's mechanical function and the microphone's audio capture function
2Productivity
If the motor operates at high frequency to quickly change display state, then productivity is improved, but motor noise frequency may overlap with human voice frequency
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors motor operating frequency and adjusts PWM duty cycles accordingly. When motor noise frequency approaches voice frequency ranges, the system reduces motor operating frequency or adjusts PWM timing to create frequency separation, ensuring both fast display response and accurate audio capture
Solution Approach 2:
The patent dynamically changes motor operating parameters (frequency and PWM duty cycle) based on real-time conditions. By adjusting these parameters, the system optimizes the balance between display state change speed and audio signal quality, preventing motor noise from overlapping with human voice frequencies while maintaining productivity
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
Effectively reduces motor noise interference, ensuring clear audio communication and recording by filtering out motor noise frequencies, allowing seamless operation of expandable displays in electronic devices.
Implementation Method 1
Implementing a filter to remove the frequency of motor-induced noise from the microphone signal
Implementation Method 2
adjusting pulse width modulation (PWM) to avoid overlapping with human voice frequencies
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
An electronic device according to various embodiments of the present disclosure may comprise a motor, a microphone, an expandable and/or reducible display, and a processor, wherein the processor: identifies whether the display is in an expanded state when a call is received; identifies whether the display has been configured to be reduced when the display is in the expanded state; drives the motor to reduce the display and applies a first filter to a sound received via the microphone when the display has been configured to be reduced; and applies a second filter different from the first filter to a sound received via the microphone when the display is reduced.