Bass Extraction Routing for Multi-Speaker Build-Up Control
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Solution Overview
Problem
Current audio processing methods face challenges in efficiently managing low-frequency audio signals in complex playback environments with multiple speakers and channels, leading to bass build-up issues during amplitude panning and array processing.
Innovation Solution
A method involving bass extraction using low-pass filters to produce extracted low-frequency audio signals, followed by routing these signals to appropriate speakers, and applying high-pass filters to other audio signals, with a bass management process that limits amplitudes and combines signals to mitigate bass build-up, while considering the playback environment's speaker layout and channel configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If array processing methods duplicate signals in phase into nearby speakers, then sound coverage is improved, but bass build-up occurs
Solution Approach 1:
The patent extracts low-frequency signals from the audio signal before array processing is applied. By separating the bass content and routing it through a dedicated low-frequency management path rather than duplicating it with the full-band signal, the harmful bass build-up is prevented while maintaining the beneficial sound coverage from array processing.
Solution Approach 2:
The audio signal is segmented into different frequency bands, with low-frequency signals being processed separately from the rest of the audio spectrum. This segmentation allows the low-frequency content to be managed independently, preventing the bass build-up that occurs when full-band signals are duplicated in phase across multiple speakers.
2Adaptability or versatility
If the number of speakers is increased to improve audio reproduction quality, then sound coverage and immersion are enhanced, but bass build-up issues worsen
Solution Approach 1:
The low-frequency signals are extracted from the overall audio signal before distribution to multiple speakers. This extraction creates a separate management path for bass content, allowing the system to utilize multiple speakers for improved sound coverage and immersion without causing bass build-up, as the low-frequency content is controlled independently.
3Measurement precision
If low-pass filters are applied to extract bass signals, then bass management control is improved, but processing complexity increases
Solution Approach 1:
The low-frequency signal extraction is performed as a preliminary step before the main array processing and signal distribution. By applying the low-pass filter and separating the bass content early in the processing chain, the system achieves precise bass management control while simplifying subsequent processing steps, as the low-frequency management is already handled.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces bass build-up and improves sound reproduction by accurately routing low-frequency signals, enhancing the audio processing efficiency and quality in multi-channel, multi-speaker setups.
Implementation Method 1
applying a bass extraction process involving low-pass filters to the audio object signals, to produce extracted low-frequency audio signals
Implementation Method 2
applying high-pass filter to at least some of the audio object signals, to produce high-pass filtered audio signals
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Improved methods and devices for processing low-frequency audio data are provided. A bass extraction process may involve applying low-pass filters to received audio object signals, to produce extracted low-frequency audio signals. The bass extraction process may be performed prior to a process of rendering audio objects into speaker feed signals. A bass management process may involve routing the extracted low-frequency audio signals to the one or more speakers capable of reproducing low-frequency audio signals.