Band-Split Overtone Processing for Natural Bass Enhancement
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Solution Overview
Problem
Existing acoustic signal-processing apparatuses fail to effectively generate overtones that enhance the feeling of bass sound without distorting the tone quality, particularly in small-sized speaker units, due to poorly structured overtone generation methods.
Innovation Solution
An acoustic signal-processing apparatus that divides low frequency components into multiple frequency bands, generates overtone components based on each band, and combines them in a way that meets specific conditions to ensure proper overtone formation, preventing distortion and ensuring the overtones fall within the speaker's reproducible frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If overtones are generated based on low frequency components without band division, then the feeling of bass sound is enhanced, but distortion occurs and tone quality degrades
Solution Approach 1:
The patent divides the low frequency component into multiple frequency bands (first, second, and third bands) and generates overtones for each band separately. This segmentation prevents distortion by processing each frequency range independently, allowing the system to enhance bass sound while maintaining tone quality.
2Ease of manufacture
If overtones are generated for all frequency bands, then bass sound feeling is maximized, but intermediate and high-pitched sounds are produced causing unnatural tone
Solution Approach 1:
The patent applies different overtone generation strategies to different frequency bands. The first band (lowest frequencies) generates overtones including both even and odd multiples, while the second and third bands generate only even multiples. This local differentiation ensures natural tone by preventing excessive high-pitched overtone generation in higher frequency ranges.
3Ease of manufacture
If multiple overtones are generated without selective combination, then bass sound enhancement is strong, but speaker becomes overloaded
Solution Approach 1:
The patent extracts and processes only specific overtone components from each frequency band. By selectively generating and combining only certain overtone multiples (even and odd for first band, even only for second and third bands), the system enhances bass sound while extracting unnecessary high-frequency components that would overload the speaker.
4Object-affected harmful factors
If band division is implemented for overtone generation, then distortion is reduced, but device complexity increases
Solution Approach 1:
The patent divides the low frequency component into three frequency bands and processes each band separately to reduce distortion. This segmentation approach manages complexity by organizing the processing into distinct, manageable stages for each band, making the overall complex processing systematic and implementable.
Data Source
AI summary
A band-dividing unit is operable to extract a low frequency component from an input signal in order to generate overtones based on the extracted low frequency component, and is further operable to divide the extracted low frequency component into signals that belongs to different frequency bands. Each of overtone-generating units is disposed for corresponding one of the different frequency bands, and is operable to generate overtones based on an output signal from corresponding one of band pass filters. An adder adds the generated overtones to the input signal that has passed through a delay. The resulting acoustic signal is sent to the outside through a high-pass filter. One overtone-generating unit designed for a higher frequency band among the different frequency bands is set to produce the same or fewer overtones than another overtone-generating unit suited for a lower frequency band thereamong does. This feature provides an array of continuous overtones with a less amount of calculation, while collectively generating the overtones at a lower frequency that falls within the range of a speaker reproducible band.