Audio Filter Parameter Smoothing for Continuous Playback
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Solution Overview
Problem
Conventional audio processing devices interrupt audio playback when adjusting filter parameters, leading to abnormal sounds and compromised quality due to the need for a mute circuit during parameter changes.
Innovation Solution
An audio processing device and method that utilize a filter and output circuit to gradually adjust parameters, reducing signal changes and maintaining continuous playback by controlling the filter's transfer function to prevent abnormal sounds during parameter modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mute circuit is configured to stop the speaker from outputting the audio signal during parameter changes, then abnormal sounds are prevented, but audio playback is interrupted
Solution Approach 1:
The patent applies parameter changes by gradually adjusting the filter parameters (bandwidth, center frequency, response gain) through multiple intermediate steps rather than making abrupt changes. This gradual parameter transition prevents abnormal sounds while maintaining continuous audio playback, resolving the contradiction between preventing abnormal sounds and maintaining playback continuity.
Solution Approach 2:
The patent implements dynamic adjustment of filter parameters during audio playback by continuously updating parameters in small increments. The system dynamically balances between allowing parameter changes to improve audio quality and maintaining continuous playback, eliminating the need for mute circuits while preventing abnormal sounds.
2Adaptability or versatility
If filter parameters are adjusted to change bandwidth, center frequency or response gain, then audio quality can be customized, but abnormal sounds occur during parameter changes
Solution Approach 1:
The patent systematically changes filter parameters (bandwidth, center frequency, response gain) in controlled increments through multiple update cycles. This approach maintains audio feature adaptability while preventing abnormal sounds by avoiding abrupt parameter transitions that would cause audible artifacts.
Solution Approach 2:
The patent maintains continuous audio signal processing throughout parameter adjustments by continuously updating the filter parameters without interrupting the audio stream. This ensures both audio feature adaptability and continuous normal sound output without abnormal artifacts.
3Duration of action of moving object
If the output circuit continuously generates the output audio signal during parameter changes, then audio playback remains continuous, but abnormal sounds may be produced
Solution Approach 1:
The patent continuously updates filter parameters in small incremental steps while the output circuit continuously generates the audio signal. This controlled parameter evolution allows continuous playback without producing abnormal sounds, as the gradual changes remain imperceptible to human hearing.
Solution Approach 2:
The patent maintains uninterrupted audio signal generation and processing throughout the entire parameter adjustment process. The output circuit continuously converts the filtered audio signal to output, ensuring both playback continuity and absence of abnormal sounds through smooth parameter transitions.
Data Source
AI summary
An audio processing device is disclosed. The audio processing device includes a filter and an output circuit. The filter is configured to receive an audio signal to generate a filtered audio signal, wherein the filter includes a plurality of parameters that are adjustable for changing a bandwidth, a center frequency or a gain of response of the filter. The output circuit is configured to receive the filtered audio signal to generate an output audio signal to a speaker. When the parameters of the filter are changed, the filter reduces changes in the audio signal caused by the parameters, and the output circuit continuously receives the filtered audio signal to generate the output audio signal for the speaker to play without interruption.