DC-Coupled Audio Output Circuit Without DC-Blocking Capacitors
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Solution Overview
Problem
Existing audio out units face challenges in providing clean power voltages to audio amplifiers, leading to noise and interference in audio signals due to polluted power sources.
Innovation Solution
A DC-coupled audio out unit is designed with regulators and voltage drive circuits that generate clean positive and negative power voltages, reducing noise and ripples to enable efficient amplification of audio signals without the need for DC-blocking capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If regulators are added to power terminals of audio amplifiers, then power quality is improved and noise is reduced, but device complexity increases
Solution Approach 1:
Voltage drive circuits are introduced as intermediary components between the power source and audio amplifiers. These circuits generate control voltages that drive the regulators, enabling clean power delivery without requiring complex direct regulator configurations. The intermediary voltage drive circuits simplify the overall system architecture while maintaining noise reduction effectiveness.
Solution Approach 2:
The power delivery system is segmented into distinct functional blocks: voltage drive circuits that generate control signals, regulators that clean the power, and audio amplifiers that process audio signals. This segmentation allows each component to be optimized independently and simplifies the overall system design by distributing complexity across modular elements.
2Device complexity
If DC-blocking capacitors are removed to reduce circuit complexity, then device complexity is reduced, but power quality requirements become more stringent
Solution Approach 1:
Power cleaning is performed in advance before signals reach the audio amplifiers. Regulators are positioned at the power terminals to pre-clean the power supply, eliminating the need for subsequent DC-blocking capacitors. This preliminary action ensures that clean power is delivered to amplifiers without requiring additional filtering components in the signal path.
Solution Approach 2:
The mechanical/electrical filtering function previously performed by DC-blocking capacitors is replaced by electronic voltage regulation. Instead of using capacitive blocking to remove DC components and noise, the system uses active regulators controlled by voltage drive circuits to electronically clean the power supply, achieving the same effect with different technological means.
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
The solution allows for the generation of clean audio output signals with common-mode DC voltage at 0V, eliminating the need for DC-blocking capacitors and reducing circuit complexity while ensuring high-quality audio output.
Implementation Method 1
The first regulator receives a power source voltage to provide a positive power voltage
Implementation Method 2
The second regulator receives the power source voltage to provide a negative power voltage
Implementation Method 3
The audio amplifier receives the positive power voltage and the negative power voltage and amplifies at least one input signal to generate an audio output signal
Data Source
AI summary
A DC-coupled audio out unit is provided, including at least one regulator and at least one audio amplifier. The regulator is coupled to at least one power terminal of the audio amplifier.