Pseudo-Bass Generator Circuit for Overflow-Free Audio Signals
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Solution Overview
Problem
Pseudo-bass generators often experience overflow issues due to high amplitude fundamental components, leading to reduced sound quality in audio signals.
Innovation Solution
A pseudo-bass generator configuration that includes an absolute-value circuit, a clipping circuit, multipliers, and adders, where the first adder attenuates the fundamental component, and the relation between coefficients α and β is set to 0.95<α+β<1.25 to prevent overflow, ensuring sound quality is maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fundamental component has a large amplitude in pseudo-bass generation, then the bass perception is enhanced, but overflow occurs leading to distorted audio signal and reduced sound quality
Solution Approach 1:
The patent extracts and separately processes the fundamental component from the audio signal through HPF and LPF filtering. By isolating the fundamental component, the system can apply specific attenuation (multiplication by coefficient α) to prevent overflow while preserving the harmonic components needed for pseudo-bass generation. This extraction approach allows targeted control of the problematic fundamental component without affecting other signal elements.
Solution Approach 2:
The patent applies parameter changes by introducing two coefficients (α and β) that control the amplitude of the fundamental component and harmonics respectively. By adjusting these parameters according to the relation 0.95 < α + β < 1.25, the system dynamically controls signal levels to prevent overflow while maintaining audible bass perception. This parameter-based control transforms the fixed-amplitude problem into a可调 (adjustable) solution.
2Adaptability or versatility
If harmonic components are added to generate pseudo-bass, then bass perception below speaker bandwidth is achieved, but the complexity of the signal processing circuit increases
Solution Approach 1:
The patent segments the signal processing into distinct functional blocks: HPF for fundamental extraction, LPF for harmonic generation, absolute value circuit for rectification, clipping circuit for waveform shaping, and multiple adders for signal combination. This segmentation allows each component to perform a specific function efficiently, making the complex pseudo-bass generation process manageable and implementable with standard circuit elements.
Solution Approach 2:
The patent employs universal signal processing components that can serve multiple purposes. For example, the adders are used both for combining harmonic components and for adding the attenuated fundamental component back to the signal. The HPF and LPF together serve both to extract and to shape the signal for different processing stages. This multi-functionality reduces the total number of components needed while achieving the desired pseudo-bass generation.
Data Source
AI summary
An absolute-value circuit outputs the absolute value of a signal SIN′ that corresponds to an input signal SIN. A clipping circuit clips the signal SIN′ that corresponds to the input signal, to a positive limit value and to a negative limit value. A first multiplier multiplies the signal SIN′ that corresponds to the input signal, by a predetermined coefficient. A first adder subtracts the output signal of the first multiplier from the output signal of the clipping circuit. A second adder sums a signal that corresponds to the output signal of the first adder and a signal that corresponds to the output signal of the absolute-value circuit. A third adder sums the input signal SIN and a signal that corresponds to the output signal of the second adder.