Noise Detection Device Using Multi-Frequency Sine Sweep Analysis
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Solution Overview
Problem
Existing noise detection methods, such as step frequency sweep tests, are inadequate for accurately identifying noise in audio signals with complex frequencies and irregular amplitude variations, leading to incomplete noise correction and user-specific noise determination issues.
Innovation Solution
A noise detection device and method that uses a key audio signal with multiple frequencies and irregular amplitude variations, processed by an input-output circuit, measurement circuit, and processing circuit to compare the output audio signal with a qualified signal, determining noise presence through audio analysis and comparison.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a step frequency sweep test is used to detect noise, then the testing process is simple, but it can only test audio signals of a single frequency and cannot accurately detect noise in complex frequency signals
Solution Approach 1:
The patent changes the frequency parameter from a single frequency (step frequency sweep) to multiple frequencies simultaneously (sine sweep signal covering 20Hz-20kHz). This allows the detection system to evaluate noise across the entire audible spectrum rather than requiring multiple sequential single-frequency tests, thereby improving measurement precision while maintaining operational simplicity.
2Adaptability or versatility
If an artificial listening manner is used to determine noise, then the detection process is flexible, but hearing senses of different people and different listening environments affect the noise determination
Solution Approach 1:
The patent replaces the mechanical/biological listening system (human ears and subjective judgment) with an electronic detection system consisting of a speaker, microphone, and signal processing circuit. This substitution eliminates the variability introduced by different human hearing senses and listening environments, providing consistent and objective noise determination across all testing scenarios.
3Ease of manufacture
If the audio signal is corrected by step frequency sweep test, then the correction process is straightforward, but the audio signal with complex frequency and irregular amplitude variation may still have noise
Solution Approach 1:
The patent employs a sine sweep signal that periodically varies in frequency over time, covering the entire audible range from 20Hz to 20kHz. This periodic frequency modulation allows the detection system to systematically evaluate noise characteristics across all frequencies, enabling comprehensive noise correction that addresses complex frequency signals and irregular amplitude variations that single-frequency tests would miss.
Data Source
AI summary
A noise detection method includes: inputting a key audio signal with multiple frequencies to an audio device to be tested; measuring a first output audio signal emitted by the audio device to be tested; performing an audio analysis on the first output audio signal to generate a measurement signal; and comparing the measurement signal with a qualified signal to generate a comparison result, and determining whether the first output audio signal has noise based on the comparison result.