Speaker Delay Correction Without Microphone Calibration
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Solution Overview
Problem
Conventional audio reproduction devices require prior measurement of sound characteristics using microphones to achieve flat frequency reproduction, making it difficult to correct for speaker-specific characteristics without manual calibration.
Innovation Solution
An audio reproduction device that includes a signal amplifier, characteristic measuring device, structure analyzer, delay characteristic calculator, correction parameter generator, and corrector to automatically measure and correct the input signal based on the speaker's structure and desired delay characteristic, allowing for flat frequency reproduction without external measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual measurement with microphone is used to correct speaker characteristics, then frequency reproduction accuracy is improved, but operation complexity and calibration time increase
Solution Approach 1:
The audio reproduction device automatically measures its own output signal characteristics through internal processing, eliminating the need for external microphones and manual calibration operations. The device self-corrects speaker characteristics by analyzing its own supply signal and comparing it with expected frequency responses.
Solution Approach 2:
The invention extracts the measurement function from external equipment (microphone) and integrates it into the audio reproduction device itself, using internal signal processing to achieve what previously required separate external measurement tools.
2Measurement precision
If external microphone measurement is used to obtain speaker characteristics, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The audio reproduction device performs multiple functions using its existing components: it generates supply signals, measures its own output characteristics, analyzes frequency responses, and corrects speaker deviations all through internal processing, eliminating the need for dedicated external measurement equipment.
Solution Approach 2:
The invention combines the measurement function with the existing audio reproduction functionality, merging what were previously separate systems (audio amplifier and external measurement device) into a single integrated system that achieves both audio output and self-characterization.
Data Source
AI summary
An audio reproduction device includes: a signal amplifier that amplifies an input signal; a characteristic measuring device that obtains a characteristic of the speaker device based on a supply signal obtained by using, as the input signal, a measurement signal having a predetermined frequency characteristic; a structure analyzer that identifies a structure of the speaker device based on a result obtained by the characteristic measuring device; a delay characteristic calculator that calculates a delay characteristic of the speaker device according to the identified structure of the speaker device; a correction parameter generator that generates a correction parameter based on a difference between the delay characteristic calculated by the delay characteristic calculator and a target delay characteristic; and a corrector that corrects the input signal input to the signal amplifier based on the correction parameter generated by the correction parameter generator.