Amplifier Clip Control for Speaker Protection and Sound Quality
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Solution Overview
Problem
Electronic musical instruments face the challenge of protecting speakers from distortion caused by high-level attack sounds, which can lead to permanent damage, and existing solutions fail to effectively manage clip values to prevent both speaker destruction and sound distortion.
Innovation Solution
An electronic device with a processor-controlled amplifier system that dynamically adjusts clip values based on current consumption thresholds, decreasing the clip value when current consumption exceeds a certain threshold and increasing it when it falls below another, using pre-defined tables to shape the output signal and prevent distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clip value is increased to protect the speaker from high-level attack sounds, then the speaker is protected from damage, but the attack sound becomes distorted
Solution Approach 1:
The clip value is changed dynamically based on the power consumption state of the amplifier. When power consumption exceeds a threshold, the clip value increases to protect the speaker; when power consumption decreases, the clip value decreases to restore sound quality. This dynamic adjustment resolves the contradiction between speaker protection and sound distortion prevention.
Solution Approach 2:
The clip value parameter is adjusted according to power consumption levels. By changing this parameter based on real-time power state, the system achieves both speaker protection during high-power conditions and sound quality preservation during normal operation, resolving the contradiction between reliability and harmful factors.
2Object-generated harmful factors
If the clip value is decreased to maintain sound quality during normal operation, then sound distortion is avoided, but the speaker becomes vulnerable to damage from sudden high-level sounds
Solution Approach 1:
The system monitors power consumption in advance and adjusts the clip value proactively. When power consumption approaches dangerous levels, the clip value is increased before speaker damage can occur. This preliminary action allows the system to maintain sound quality during normal operation while being prepared to protect the speaker when needed.
Solution Approach 2:
The system continuously monitors power consumption and uses this feedback to adjust the clip value. This closed-loop control ensures that the clip value is optimized for both sound quality and speaker protection based on real-time operating conditions, resolving the contradiction between these two requirements.
3Reliability
If a fixed high clip value is used to protect the speaker, then speaker protection is ensured, but the amplifier cannot output high-level sounds even during brief moments
Solution Approach 1:
Rather than using a fixed high clip value, the system dynamically adjusts the clip value based on power consumption. This allows the amplifier to maintain high output capability during normal operation while providing speaker protection when power consumption indicates a risk of damage, resolving the contradiction between reliability and productivity.
Data Source
AI summary
An electronic device includes: an amplifier configured to amplify an input signal and output an output signal obtained by shaping the amplified input signal; and at least one processor. The at least one processor is configured to: obtain a value indicating power supplied to the amplifier, control the amplifier in a first pattern such that a clip value for the output signal decreases, when detecting that the value is larger than a reference potential and that the value becomes larger than a first threshold larger than a second threshold from a state of being smaller than the second threshold; and control the amplifier in a second pattern such that the clip value for the output signal increases, when detecting that the value is larger than the reference potential and that the value becomes smaller than the second threshold from a state of being larger than the first threshold.