Audio Power Noise Filtering With Multi-Stage LDO and Bead Circuit

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Solution Overview

Problem

Hi-Fi audio systems are vulnerable to power line noise, which deteriorates the quality of audio signals due to the lack of effective noise removal mechanisms.

Innovation Solution

A device with a noise removing unit that stepwise removes noise components from the power source terminal, utilizing a combination of beads, capacitors, and low drop out (LDO) regulators to transfer clean power to the converting and amplification units, and includes a mute unit with dual FETs to manage pop noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If power line noise is present in the audio system, then the audio signal quality deteriorates, but adding noise removing units increases device complexity

Engineering Contradiction:

Improveaudio signal qualityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The power supply path is segmented into multiple stages, with separate noise removing units (first, second, third, fourth) placed at different locations between the power source terminal and the converting/amplification units. Each unit handles specific noise components at different stages of power delivery, dividing the noise removal function into manageable segments that collectively improve audio signal quality without overwhelming complexity.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If multiple noise removing units are used to effectively remove power noise, then noise removal effectiveness improves, but the device complexity increases

Engineering Contradiction:

Improvepower noise removal effectivenessVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The noise removing units act as intermediary components between the power source terminal and the audio processing units (converting and amplification units). These intermediaries filter and condition the power signal, removing noise components before they can affect the sensitive audio circuitry. The use of multiple intermediary units at different stages provides progressive noise removal, effectively reducing power noise impact while maintaining a structured and organized device architecture.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Effectively removes power noise from the audio signal, enhancing the quality of the audio output by minimizing interference and ensuring high-quality sound reproduction.

Implementation Method 1

The primary noise removing unit uses a bead for removing high-frequency noise

Methodology Applied

Scientific EffectElectromagnetic filtering: Filter (electronic)

Implementation Method 2

The secondary noise removing unit uses a capacitor having a serial equivalent resistance value lower than a predetermined value

Methodology Applied

Scientific EffectElectrical filtering: Filter (electronic)

Implementation Method 3

The tertiary noise removing unit uses a low drop out (LDO) regulator

Methodology Applied

Scientific EffectVoltage regulation:

Data Source

PatentUS10819304B2Apparatus for discarding power noise, and apparatus for converting audio signal

Publication Date: 2020.10.27 MEEWANG INC

AI summary

Embodiments provide a device for removing noise of a power source and an apparatus for converting an audio signal, which remove a noise component which comes from a power source terminal of an audio signal converting apparatus stepwise and transfer power to a converting unit and an amplification unit included in the audio signal converting apparatus from a power source terminal to remove power noise.