Turntable Base Speaker System Vibration Cancellation

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Solution Overview

Problem

Existing speaker systems for turntables often experience feedback, resonance, and audio-disruptive noise when a turntable is placed near or directly atop a speaker system, particularly due to sympathetic vibrations and phase differences in sound waves, which are exacerbated by the design of phonographs with built-in speakers.

Innovation Solution

A base speaker system configured with internal and external portions, featuring a power input, phono input, built-in phono preamp, woofers, tweeters, and a power amplifier, with low-frequency transducers on opposing sides to cancel vibrations and mix stereo channels to mono signals at low bass frequencies for effective vibration cancellation, while maintaining stereo separation for frequencies above.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If speakers are enclosed to isolate sound waves, then sound cancellation is reduced, but sympathetic vibration of the speaker enclosure still produces buzzing noise

Engineering Contradiction:

Improvesound cancellationVSAvoidbuzzing noise from sympathetic vibration

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent applies passive radiators that convert the harmful sympathetic vibrations into beneficial acoustic output. The passive radiators are driven by air pressure changes in the sealed enclosure rather than direct electrical signals, transforming the vibration problem into a useful sound reproduction mechanism that cancels out the buzzing noise.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the operational parameters of the speaker system by using passive radiators that respond to air pressure changes rather than direct electromagnetic drive. This parameter change allows the system to operate in a regime where vibrations are converted into useful acoustic output rather than harmful noise.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If turntable is placed near or directly atop speaker system, then self-contained phonograph setup is achieved, but feedback and resonance occur due to sympathetic vibrations

Engineering Contradiction:

Improveself-contained phonograph setupVSAvoidfeedback and resonance

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The passive radiators convert the harmful sympathetic vibrations from the turntable into beneficial acoustic output. By using air pressure changes to drive the passive radiators, the system transforms the vibration feedback problem into a useful sound reproduction mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent introduces air pressure changes as an intermediary between the turntable vibrations and the acoustic output. The passive radiators are driven by these pressure changes rather than direct mechanical coupling, creating a mediator that prevents direct vibration transmission while still producing useful sound.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Power

If speaker volume is increased, then audio output is improved, but buzzing sound from sympathetic vibration worsens

Engineering Contradiction:

Improveaudio outputVSAvoidbuzzing sound

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The passive radiators convert the harmful high-volume sympathetic vibrations into beneficial acoustic output. As volume increases, the air pressure changes drive the passive radiators more effectively, transforming the buzzing noise into useful sound reproduction.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the response characteristics of the speaker system by using passive radiators that respond to air pressure changes. This allows the system to increase volume without proportionally increasing sympathetic vibration noise, as the passive radiators operate in a different regime than traditional electromagnetic drivers.

Inventive Principle:

Principle #35Parameter changes

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 effectively eliminates feedback and resonance, providing a stable and noise-free audio experience by canceling vibrations and minimizing surface vibrations, allowing for a self-contained phonograph setup without the need for external isolation.

Implementation Method 1

The base speaker system is configured to eliminate audio-disruptive noise... low-frequency transducers on opposing sides to cancel vibrations

Methodology Applied

Scientific EffectDestructive interference: Interference

Implementation Method 2

a buzzing sound may occur, which is produced by sympathetic vibration of the speaker enclosure

Methodology Applied

Scientific EffectSympathetic vibration: Resonance

Data Source

PatentUS12035119B2Base speaker system for use with turntable that eliminates feedback, resonance, and other audio-disruptive noise

Publication Date: 2024.07.09 ANDOVER AUDIO LLC

AI summary

A base speaker system for use with a turntable that eliminates feedback playback while playing vinyl records is described. The base speaker system for use with the turntable prevents feedback, resonance, or other audio-disruptive noise that typically occurs when a turntable is placed near to a speaker system. Moreover, the base speaker system may be a standalone model that receives a turntable thereon or may be configured as a cabinet assembly for a built-in setup.