Sound Signal Processing Device Noise Detection Control
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Solution Overview
Problem
Existing noise detection systems in conference systems fail to accurately distinguish composite noise from voice signals, leading to inappropriate switching between output and block states, resulting in noise release into conference halls.
Innovation Solution
A sound signal processing device with an input part, noise detection part, and control part that uses bandpass filtering, frequency component determination, and temporal change determination to differentiate between voice and noise signals, ensuring precise noise detection and preventing misclassification of composite noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If noise detection is performed using autocorrelation coefficients for different frequency ranges, then impulsive noise can be detected, but composite noise cannot be detected accurately
Solution Approach 1:
The patent divides noise detection into multiple frequency range segments (low range, high range, and bandpass range) and applies different detection methods to each segment. This segmentation allows the system to handle different types of noise appropriately for each frequency characteristic, resolving the contradiction between detecting simple impulsive noise and more complex composite noise.
Solution Approach 2:
The patent changes the detection parameters by introducing bandpass filtering with specific frequency characteristics that differ from conventional low-pass and high-pass filters. By adjusting the center frequency and bandwidth parameters of the bandpass filter, the system can adaptively detect composite noise that was previously undetectable by fixed-frequency-range detectors.
2Object-affected harmful factors
If noise detection blocks output during voice signal presence, then noise release is prevented, but voice signals may be incorrectly blocked
Solution Approach 1:
The patent introduces an output switching part that acts as an intermediary between the noise detection part and the output part. This intermediary component receives control signals from the noise detection part and selectively switches the output state, allowing precise control over when noise is blocked and when voice signals are permitted to pass through, thereby preventing both noise release and false voice blocking.
3Ease of manufacture
If conventional filtering is used, then simple noise can be filtered, but composite noise with specific frequency characteristics cannot be filtered effectively
Solution Approach 1:
The patent designs a bandpass filter that serves multiple functions: it filters composite noise with specific frequency characteristics while also working in conjunction with conventional low-pass and high-pass filters. This multi-functional filtering approach maintains implementation simplicity while significantly improving composite noise detection capability.
Data Source
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AI summary
The present invention provides a sound signal processing device that precisely detects various kinds of noises and that does not block output of voice signals even when detecting noise during the output of the voice signals. The sound signal processing device according to the present invention comprises: an input part 10; an input signal determination part 20 that determines whether an input signal from the input part is present; a noise detection part 30 that detects noise included in the input signal from the input part; an output part 80 that outputs the input signal as an output signal; an output switching part 52 that performs switching between an output state in which the output part outputs the output signal and a non-output state in which the output part does not output the output signal; and a control part 60 that controls the switching performed by the output switching part. The control with the control part for switching includes first control that controls the switching based on a determination result r1 from the input signal determination part and a detection result r2 from the noise detection part, and second control that controls the switching based on the determination result from the input signal determination part. One of the first control and the second control is selected based on a state of the output switching part.