Headset Noise-Based Pulsed Attenuation Circuit
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Solution Overview
Problem
Headsets with talk-through functionality face challenges in distinguishing between speech sounds and sudden, loud environmental noises, leading to false triggering of audio compressors, which can disrupt communication by momentarily attenuating speech sounds.
Innovation Solution
Incorporating an audio circuit that compresses signals from talk-through microphones in response to peaks exceeding predetermined voltage levels with rapid rate of change, using a timing circuit to control the duration of compression, and employing a pulsed attenuator to preemptively address sudden noise events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If audio compression is applied to reduce sudden loud noises, then the impact of environmental noise is reduced, but speech sounds are also attenuated due to false triggering
Solution Approach 1:
The patent applies different compression characteristics to different portions of the audio signal by detecting the rate of change (slope) of the input signal. Speech signals with gradual changes pass through uncompressed, while sudden noise peaks with rapid changes are compressed. This local differentiation based on signal characteristics resolves the contradiction by treating different signal types differently.
Solution Approach 2:
The patent dynamically changes the compression parameter (amount of attenuation) based on the detected rate of change of the input signal. When the slope exceeds a threshold indicating sudden noise, compression is applied; when the slope is gradual indicating speech, no compression is applied. This parameter adjustment based on signal characteristics resolves the false triggering problem.
2Object-affected harmful factors
If audio compression is triggered by loud sounds, then environmental noise is attenuated, but communication is disrupted due to momentary attenuation of speech
Solution Approach 1:
The patent distinguishes between speech and noise based on the local characteristic of rate of change. By applying compression only to signal portions with rapid changes (noise) and not to portions with gradual changes (speech), communication continuity is maintained while noise attenuation is achieved.
Solution Approach 2:
The system continuously monitors the rate of change of the audio signal and uses this feedback to control the compression activation. This real-time feedback mechanism ensures that compression is applied only when necessary (sudden noise detected) and released immediately when speech is detected, maintaining communication ease.
3Measurement precision
If fast-onset noise detection is implemented, then sudden environmental sounds are identified, but false triggering occurs from electrical noise with similar characteristics
Solution Approach 1:
The patent uses the rate of change (slope) parameter to distinguish between genuine sudden noises and electrical noise. By setting an appropriate threshold for the rate of change, the system can differentiate between acoustic events of interest and electrical interference, improving detection reliability while maintaining precision.
Data Source
Figure 1a~1b
Figure 2a
Figure 2b
AI summary
A headset having a talk-through microphones incorporates an audio circuit that compresses a signal representing sounds detected by the talk-through microphones in response to the audio circuit detecting the onset of a peak (positive and/or negative) in the signal that exceeds a predetermined voltage level (positive and/or negative voltage level, perhaps a predetermined magnitude of voltage from a zero voltage level), and that does so with a rate of change in voltage level that exceeds a predetermined rate of change in voltage level, the degree of compression possibly being a compression to or near a zero amplitude (perhaps to or near a zero voltage level) and the duration of the compression possibly being controlled by a timing circuit set to a predetermined period of time that may be retriggerable while amidst the predetermined period of time.