Dual-Feedback Loudspeaker Amplifier for Low-Noise Audio Linearity
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Solution Overview
Problem
Conventional loudspeaker power amplifiers face challenges in reducing inherent noise and improving linearity, particularly in the audio frequency range.
Innovation Solution
A digital loudspeaker power amplifier with a configuration of two inputs and two outputs, featuring first and second feedback circuits with active amplification circuits, and smoothing circuits to enhance amplification and reduce noise, utilizing a combination of active and passive negative feedback to improve stability and reduce distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If active amplification circuits are used in feedback loops, then inherent noise and distortion are reduced, but device complexity increases
Solution Approach 1:
The patent implements dual feedback loops with active amplification circuits that feed back a portion of the output signal to the input. This feedback mechanism reduces inherent noise and distortion by continuously correcting deviations from the desired output, directly addressing the harmful factors while managing complexity through structured feedback architecture
Solution Approach 2:
The active amplification circuits in the feedback loops dynamically adjust amplification parameters to optimize noise reduction. By changing amplification factors and frequency responses, the system reduces inherent noise while maintaining manageable complexity through parameter optimization rather than structural complexity
2Power
If high amplification is maintained across all frequencies, then audio frequency amplification is improved, but stability decreases due to high-frequency oscillations
Solution Approach 1:
The patent applies different amplification characteristics to different frequency ranges. The active amplification circuits are designed to provide high amplification specifically in the audio frequency range while reducing amplification at higher frequencies, creating local quality variations that maintain stability without sacrificing audio performance
Solution Approach 2:
The amplification characteristics of the active amplification circuits are made frequency-dependent, allowing the system to dynamically adjust its response. The circuits provide high amplification where needed (audio frequencies) and reduce amplification where it causes problems (high frequencies), achieving both power and stability through dynamic behavior
3Object-affected harmful factors
If smoothing circuits are added to reduce noise, then output signal quality is improved, but device complexity increases
Solution Approach 1:
The patent combines smoothing circuits with the feedback loops and active amplification circuits into an integrated system. Rather than adding smoothing as a separate standalone component, it merges multiple functions (amplification, feedback, and smoothing) into a unified architecture, reducing overall device complexity while maintaining noise reduction benefits
Solution Approach 2:
The active amplification circuits serve multiple functions simultaneously: they provide signal amplification, implement feedback control, and work with smoothing circuits to reduce noise. This multi-functionality reduces the need for separate dedicated components, thereby managing device complexity while achieving noise reduction
Data Source
AI summary
A loudspeaker power amplifier comprising a digital amplifier is provided. The amplifier has a negative input and a positive input as well as a negative output and a positive output. The power amplifier further comprises a first feedback circuit from the positive output to the negative input, and a second feedback circuit from the negative output to the positive input. The first and the second feedback circuit each have a first and a second amplification circuit.