Multichannel Audio Bass Enhancement Using Compression Feedback
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Solution Overview
Problem
Conventional audio processing methods fail to effectively enhance bass response in multichannel audio signals without causing speaker distortion, especially at higher volumes, due to the limitations of speakers and the counteracting effects of multiband compression and limiter systems.
Innovation Solution
A method and system for audio signal compression and enhancement that utilize feedback from smart amplifiers and multiband limiters to dynamically route audio content between channels, applying bass enhancement and compression in a frequency-dependent manner to prevent distortion and improve volume and intelligibility, while considering the power handling characteristics of speakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If equalization-type bass enhancement is applied to boost low frequency content, then bass response is improved, but speaker distortion occurs at high volume levels
Solution Approach 1:
The patent implements a feedback mechanism where compression feedback from the multiband limiter is used to dynamically control the bass enhancement processing. The system monitors the amount of compression applied in different frequency bands and adjusts the bass enhancement accordingly, reducing or disabling it when compression indicates approaching distortion thresholds.
Solution Approach 2:
The bass enhancement is made dynamic rather than static. The system continuously adapts the bass enhancement parameters based on real-time feedback from the multiband limiter, changing the degree and type of bass enhancement applied according to the current audio signal characteristics and speaker loading conditions.
2Reliability
If multiband compression is applied to prevent speaker distortion, then speaker protection is improved, but bass enhancement effects are counteracted and overall playback volume is reduced
Solution Approach 1:
The system performs bass enhancement on the audio signal before it enters the multiband limiter. By applying bass enhancement preliminarily and then using the limiter's compression feedback to control subsequent processing, the system ensures bass content is enhanced while the limiter prevents distortion by attenuating only when necessary.
Solution Approach 2:
The system changes processing parameters dynamically based on feedback. When the multiband limiter applies compression in certain bands, the bass enhancement parameters are adjusted to compensate, maintaining bass response while respecting the compression applied to prevent distortion.
3Reliability
If broadband limiting is applied to ensure speakers do not distort, then speaker protection is improved, but spectral imbalance occurs at higher volumes
Solution Approach 1:
The patent divides the audio signal into multiple frequency bands using a multiband limiter rather than applying broadband limiting. This segmentation allows different compression thresholds and characteristics to be applied to different frequency ranges, preventing spectral imbalance while still protecting speakers from distortion.
Solution Approach 2:
Different frequency bands are treated with different compression characteristics. The multiband limiter applies localized compression only where and when needed in each frequency band, rather than uniformly across the entire spectrum, preserving spectral balance while preventing distortion.
4Stability of the object's composition
If hybrid timbre preservation limiting is applied to preserve timbre, then timbre consistency is improved, but bass enhancement is reduced and overall volume is limited
Solution Approach 1:
The system uses compression feedback from the timbre preservation limiter to dynamically control bass enhancement. When the limiter applies less aggressive limiting to preserve timbre, the bass enhancement can be increased accordingly, and vice versa, optimizing both timbre consistency and bass response based on real-time conditions.
Data Source
AI summary
In some embodiments, a method for performing at least one of enhancement, decoding, or rendering of a multichannel audio signal in response to compression feedback or feedback from a smart amplifier. For example, the compression feedback may be indicative of amount of compression applied to each of multiple frequency bands, of the audio signal or an enhanced audio signal generated in response thereto. The enhancement (e.g., bass enhancement) may include dynamic routing of audio content of the input audio signal between channels of an enhanced audio signal generated in response thereto. The enhancement and compression may be performed on a per speaker class basis. Other aspects are systems (e.g., programmed processors) and devices (e.g., devices having physically-limited bass reproduction capabilities, such as, for example, a notebook or laptop computer, tablet, soundbar, mobile phone, or other device with small speakers) configured to perform any embodiment of the method.