Audio Gain Switching Using Differential Gain Decay to Reduce Noise
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Solution Overview
Problem
Conventional audio signal processors experience noise when switching gain values due to disruption of the waveform sequence, with existing solutions failing to address this issue effectively.
Innovation Solution
An audio signal processor incorporating a difference detecting circuit, gain switching circuit, differential gain value changing circuit, and gain control circuit to gradually adjust the differential gain value over time when switching between total gain values, maintaining waveform continuity and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the gain value is switched abruptly from the first total gain value to the second total gain value, then the response speed is improved, but noise occurs due to waveform sequence disruption
Solution Approach 1:
The patent applies dynamics by transitioning the gain value from abrupt switching to gradual adjustment. The differential gain value is decreased step-by-step over time after switching, creating a dynamic transition process that maintains waveform continuity and eliminates noise while still achieving responsive gain changes.
Solution Approach 2:
The patent applies preliminary action by preparing the differential gain value adjustment in advance. The system detects the differential gain value immediately upon switching and begins the gradual decrease process, proactively preventing noise before it can occur due to waveform disruption.
2Object-generated harmful factors
If the differential gain value is decreased gradually as time passes, then noise is reduced by maintaining waveform continuity, but the response time for gain switching is extended
Solution Approach 1:
The patent applies partial action by implementing a time-limited gradual decrease of the differential gain value. The gain transition occurs over a predetermined time period rather than indefinitely, achieving noise reduction during the critical transition phase while limiting the total time penalty for gain switching.
Data Source
AI summary
An audio signal processor includes a difference detecting circuit, a gain switching circuit, a differential gain value changing circuit, and a gain control circuit. The difference detecting circuit detects a differential gain value being a first total gain value being a gain value to be switched and a second total gain value being the gain value that has been switched. The gain switching circuit switches the first total gain value to the second total gain value. The differential gain value changing circuit decreases the differential gain value as time passes. The gain control circuit corrects an inputted signal with the differential gain value that decreases as time passes.