Dynamic Speaker Signal Linearization Without Pilot Tone Interference

Solution Overview

Problem

Existing methods for operating dynamic speakers using a reference signal for linearization and current measurement interfere with the useful signal, leading to audible intermodulation effects and limiting the usable range of diaphragm deflection.

Innovation Solution

The reference signal is generated based on properties of the useful signal, allowing it to take over the function of the pilot tone, reducing or eliminating the need for a separate pilot tone, and adapting to the useful signal's amplitude, thereby expanding the diaphragm's usable range and minimizing intermodulation effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separate reference signal is applied in addition to the useful signal for linearization, then driving parameters can be linearized and current can be measured, but the diaphragm deflection range is reduced and intermodulation effects occur

Engineering Contradiction:

Improvelinearization accuracyVSAvoidintermodulation effects

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent merges the reference signal generation with the useful signal processing by using the useful signal itself (or a processed version thereof) as the reference signal. This eliminates the need for a separate pilot tone generator and removes the harmful intermodulation effects that arise from adding an independent reference signal to the useful signal.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The useful signal serves dual functions: it is both the signal to be reproduced and the reference signal for linearization and current measurement. This multi-functionality approach eliminates the need for dedicated pilot tones while maintaining the necessary measurement and control capabilities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a separate reference signal is applied in addition to the useful signal for linearization, then driving parameters can be linearized and current can be measured, but the usable range of diaphragm deflection is reduced

Engineering Contradiction:

Improvelinearization accuracyVSAvoiddiaphragm deflection range

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent merges the reference signal generation with the useful signal processing by using the useful signal itself (or a processed version thereof) as the reference signal. This eliminates the need for a separate pilot tone generator and removes the harmful intermodulation effects that arise from adding an independent reference signal to the useful signal.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The useful signal serves dual functions: it is both the signal to be reproduced and the reference signal for linearization and current measurement. This multi-functionality approach eliminates the need for dedicated pilot tones while maintaining the necessary measurement and control capabilities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If a separate reference signal is applied in addition to the useful signal for linearization, then current measurement is enabled, but the speaker cannot be used to full extent for reproducing the useful signal

Engineering Contradiction:

Improvecurrent measurement capabilityVSAvoiduseful signal reproduction efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent merges the reference signal generation with the useful signal processing by using the useful signal itself (or a processed version thereof) as the reference signal. This eliminates the need for a separate pilot tone generator and removes the harmful intermodulation effects that arise from adding an independent reference signal to the useful signal.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The useful signal serves dual functions: it is both the signal to be reproduced and the reference signal for linearization and current measurement. This multi-functionality approach eliminates the need for dedicated pilot tones while maintaining the necessary measurement and control capabilities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This approach enhances the speaker's ability to reproduce the useful signal by fully utilizing the diaphragm deflection and reduces intermodulation interference, improving sound reproduction quality.

Implementation Method 1

a voice coil of the speaker

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Implementation Method 2

sound generated by the useful signal

Methodology Applied

Scientific EffectSound wave generation: Sound

Data Source

PatentUS20260067620A1Method for operating a speaker

Publication Date: 2026.03.05 PARAGON GMBH & CO KGAA

AI summary

A method for operating a speaker, in particular a dynamic speaker, in which a reference signal for producing a pilot tone and a useful signal for producing sound by the speaker are processed. The reference signal is generated depending on a property of the useful signal. Advantageously, the reference signal is generated depending on an electrical property, preferably a voltage, a current, and/or a power, of the useful signal.