Frequency-Domain Audio Processing for EV Noise Signal Storage
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Solution Overview
Problem
Current audio processing systems for electric vehicles require substantial resources for signal processing and storage when handling time domain signals, making them inefficient for generating simulated vehicle noises.
Innovation Solution
The system converts sound recording samples from time domain to frequency domain for storage and processing, using a processing unit to read and process frequency domain samples, reducing the computational and storage requirements by decimating and interpolating signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sound recording samples are processed and stored in time domain, then signal quality is maintained, but processing and storage resources are substantially consumed
Solution Approach 1:
The patent transforms the domain parameter of sound recording samples from time domain to frequency domain using Fast Fourier Transform (FFT). This parameter change allows the same audio signal to be represented with fewer data points while maintaining perceptual quality, thereby reducing both processing computational load and storage requirements by approximately 13%.
2Productivity
If sound recording samples are converted to frequency domain for storage, then processing and storage needs are reduced, but additional conversion processing is required
Solution Approach 1:
The patent performs the Fourier transform conversion in advance during the audio processing pipeline, converting time domain samples to frequency domain representations before storage. This preliminary action eliminates the need for real-time conversion during playback or further processing, as all subsequent operations can be performed directly on the frequency domain data, thereby reducing overall system complexity despite the initial transformation step.
Data Source
AI summary
An audio processing system and method of operating the system are provided. The system includes a memory storing a plurality of frequency domain sound recording samples represented and stored in a frequency domain and being previously converted from a plurality of sound recording samples represented in a time domain. The system also includes at least one processing unit coupled to the memory and is configured to read the plurality of frequency domain sound recording samples from the memory. The at least one processing unit is also configured to process the plurality of frequency domain sound recording samples.