Active Sound Generation with Variable Sampling for Smart Devices
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Solution Overview
Problem
Conventional active sound control (ASC) systems are not compatible with smart devices due to high computational requirements, and there is a need to reduce calculation load to enable sound effects on devices like smartphones while allowing personal preference adjustments.
Innovation Solution
An active sound generation device that operates on smart devices with a low sampling rate, using a low sampling rate generation part, processing frequency setting, and high sampling rate generation part to reduce computational load, allowing personal tone adjustments and compatibility with other applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active sound control is implemented using conventional ECU-based signal processing, then sound effect generation is achieved, but computational load becomes excessively high for smart devices
Solution Approach 1:
The signal processing is divided into two distinct stages: low sampling rate generation (sound effect creation) and high sampling rate conversion (output preparation). This segmentation allows computationally intensive operations to be performed at lower sampling rates, reducing overall computational load while maintaining audio quality.
Solution Approach 2:
The sampling rate parameter is dynamically adjusted based on operational needs. Low sampling rate is used during sound effect generation to minimize computation, while high sampling rate is applied only during the final conversion stage to ensure audio quality, thereby optimizing the balance between computational efficiency and sound quality.
2Measurement precision
If high sampling rate signal processing is used throughout, then audio quality is maintained, but computational requirements exceed smart device capabilities
Solution Approach 1:
The processing pipeline is segmented into quality-critical stages (high sampling rate conversion at output) and computation-intensive stages (low sampling rate generation). This allows the system to apply high sampling rate only where audio quality is most impacted, while performing bulk processing at lower rates for efficiency.
Solution Approach 2:
The sampling rate parameter is changed according to the processing stage: low sampling rate during sound effect generation for efficiency, and high sampling rate during final conversion for quality. This dynamic parameter adjustment optimizes both audio quality and processing efficiency.
3Device complexity
If fixed sampling rate processing is used, then system simplicity is maintained, but adaptability to different sound preferences and scenarios is limited
Solution Approach 1:
The system transitions from fixed sampling rate to dynamic sampling rate adjustment. The processing frequency setting part enables flexible switching between low and high sampling rates based on operational requirements, while the tone adjustment part allows real-time modification of sound characteristics, enhancing adaptability without significantly increasing system complexity.
Solution Approach 2:
Multiple parameters including sampling rate and tone characteristics are made adjustable. The processing frequency setting part controls sampling rate transitions, while the tone adjustment part modifies sound effect parameters, allowing the system to adapt to different user preferences and driving scenarios while maintaining a relatively simple architecture.
Data Source
AI summary
An active sound generation device is proposed to generate a sound effect in a vehicle interior. The active sound generation device includes: a low sampling rate generation part, generating a low sampling rate signal by lowering a sampling rate; a processing frequency setting part, setting the sampling rate of the low sampling rate generation part; a high sampling rate generation part, amplifying a sampling rate of the low sampling rate signal to generate a high sampling rate signal as the sound effect; and a speaker, outputting the sound effect.