Audio Processing Device Stereo Emphasis Floor Noise Reduction
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Solution Overview
Problem
Existing audio processing methods using non-directional microphones for stereo audio collection face challenges in maintaining low-frequency components while minimizing noise, particularly floor noise, which can be intrusive and affect the stereo feeling.
Innovation Solution
An audio processing device with low-pass filters, amplification units, and control mechanisms that selectively amplify low-frequency components and adjust noise levels to emphasize stereo feeling while reducing floor noise, utilizing a combination of low-pass filters, amplifiers, and a low-frequency component determination unit to optimize signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If low-frequency component level is adjusted to maintain stereo feeling, then low-frequency signal quality is improved, but floor noise increases
Solution Approach 1:
The audio signal is segmented into different frequency components using low-pass filters (LPF1, LPF2, LPF3), allowing separate processing of low-frequency components from the original stereo signals and their sum. This enables selective enhancement of desired low-frequency content while filtering out noise components.
Solution Approach 2:
A monophonic low-frequency signal is introduced as an intermediary element. This low-frequency component, derived from the sum of left and right channels, serves as a mediator that can be independently controlled and mixed with the stereo signals to enhance low-frequency presence without directly amplifying noise in the original channels.
2Measurement precision
If stereo feeling emphasis processing is performed, then directional characteristics are improved, but low-frequency component is greatly damped
Solution Approach 1:
The invention merges the original stereo signals with an additional monophonic low-frequency signal. By combining these separate signal sources through addition units, the system restores low-frequency components that were damped during stereo emphasis processing while preserving the enhanced stereo feeling.
Solution Approach 2:
The system dynamically adjusts the mixing ratio between the stereo signals and the monophonic low-frequency signal based on signal levels and noise conditions. This dynamic control allows optimal balance between maintaining stereo feeling and preserving low-frequency content across different audio scenarios.
Data Source
AI summary
An audio processing device includes first and second LPFs for outputting low-frequency components of a first right channel signal and a first left channel signal; a first subtracter for subtracting an output signal of the second LPF from the first right channel signal, thereby outputting a second right channel signal; a second subtracter for subtracting an output signal of the first LPF from the first left channel signal, thereby outputting a second left channel signal; a third LPF for outputting a low-frequency component of a signal obtained by addition of the first right channel signal and the first left channel signal; a first amplifier for amplifying an output signal of the third LPF; and adders for adding up the second right channel signal and an output signal of the first amplifier and to add up the second left channel signal and the output signal of the first amplifier.