Speaker Output Correction with Displacement Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing speaker technologies face challenges in accurately correcting output characteristics without physical enlargement, especially for low-frequency reproduction, and cannot adapt to aging-related changes in transfer characteristics.
Innovation Solution
A speaker output characteristic correction system that uses a filter to apply a set filter transfer characteristic to audio signals, adjusts parameters based on displacement detection, and updates the transfer characteristic to match a target characteristic, incorporating a displacement detection unit and an input detection unit to adapt to changes in speaker parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the diameter of the speaker is increased to increase low-frequency sound pressure level, then the sound pressure level is improved, but the size, weight, and cost increase
Solution Approach 1:
The patent changes the electrical parameters of the speaker by convoluting inverse characteristics of transfer characteristics and required transfer characteristics into the audio signal. This allows the existing speaker to operate with modified electrical characteristics that compensate for its physical limitations, achieving enhanced low-frequency sound pressure level without increasing physical size or weight
Solution Approach 2:
The patent replaces the mechanical approach of increasing speaker diameter with an electrical signal processing approach. By applying inverse filter characteristics to the audio signal, the system achieves the desired acoustic output without relying on larger mechanical components
2Manufacturing precision
If inverse characteristics are calculated using pre-experiment with microphone to correct speaker characteristics, then the output characteristic correction is achieved, but it cannot accurately calculate inverse characteristics for each speaker with different characteristics or errors and cannot cope with aging-related changes
Solution Approach 1:
The patent introduces a feedback mechanism where the actual transfer characteristic of each speaker is measured and used to calculate the inverse characteristics. This feedback loop allows the system to adapt to individual speaker variations and aging-related changes, ensuring accurate correction for each specific speaker rather than using generic pre-calculated characteristics
Solution Approach 2:
The patent performs preliminary measurement of the actual transfer characteristic for each speaker before operation. By measuring and storing the specific characteristics of each speaker in advance, the system can calculate accurate inverse characteristics tailored to each individual speaker, preparing the correction parameters before actual use
Data Source
AI summary
A speaker output characteristic correction system for correcting an output characteristic of a speaker with respect to an audio signal output from a sound source device, includes a filter configured to supply to the speaker an output obtained by applying a set filter transfer characteristic to the audio signal output from the sound source device, a transfer characteristic setting unit configured to set a filter transfer characteristic of the filter, and a displacement detection unit configured to detect a displacement of a vibration of the speaker.