Electroacoustic Converter Pulse Timing for Wireless Noise Suppression
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Solution Overview
Problem
Noise generated by electroacoustic conversion can disturb communication frequencies in electronic devices, such as smartphones, which perform wireless communication and audio playback.
Innovation Solution
An electronic device with a switching element unit that applies voltages to an electroacoustic converter based on pulse signals, and a delay circuit that introduces a delay in at least one of the pulse signals based on the communication frequency, to suppress noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If pulse signals are applied to drive the electroacoustic converter, then sound output is achieved, but noise is generated that disturbs communication frequency
Solution Approach 1:
The patent applies periodic pulse signals to drive the electroacoustic converter in a controlled manner. By using periodic pulsing rather than continuous operation, the system achieves sound output while creating predictable noise patterns that can be managed through synchronization with communication cycles.
Solution Approach 2:
The patent introduces a delay circuit that generates pulse signals in advance with predetermined timing relationships. The delay circuit creates pulse signals delayed by specific time periods (Td1, Td2) relative to communication frequency cycles, ensuring that high-power pulsing occurs during periods when communication is not occurring, thereby preventing noise interference.
2Power
If high power is applied to the electroacoustic converter, then sound quality improves, but noise interference with communication increases
Solution Approach 1:
The delay circuit generates pulse signals in advance with predetermined timing, delaying them by specific time periods (Td1, Td2) relative to communication frequency cycles. This preliminary timing arrangement ensures that high-power pulsing occurs during intervals when communication is not occurring, allowing high sound quality without communication interference.
Solution Approach 2:
The system uses periodic pulse signals with controlled duty ratios that correspond to communication cycles. By synchronizing the periodic pulsing with communication frequency cycles, the system delivers high power during non-communication periods while maintaining quiet operation during communication periods.
3Measurement precision
If pulse width modulation is used to control sound level, then audio fidelity improves, but noise generation increases
Solution Approach 1:
The patent employs pulse width modulation with periodic pulse signals where the duty ratio corresponds to communication cycles. This periodic PWM approach maintains audio fidelity through precise duty cycle control while synchronizing noise generation with non-communication periods, thereby reducing overall noise interference.
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
The solution effectively reduces electroacoustic noise by synchronizing the pulse signals with the communication frequency, thereby minimizing noise interference and improving sound quality in electronic devices.
Implementation Method 1
an electroacoustic converter, and a switching element unit that applies a voltage based on a direct-current power supply to one end of the electroacoustic converter
Data Source
AI summary
There is provided an electronic device including a switching element unit that applies a voltage based on a direct-current power supply to one end of an electroacoustic converter in response to a first pulse signal and applies a voltage based on the direct-current power supply to another end of the electroacoustic converter in response to a second pulse signal, and a delay circuit that generates a delay based on a communication frequency in at least one of the first pulse signal and the second pulse signal.