Speaker Delay Correction Without Microphone Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional audio reproduction devices require prior measurement of sound characteristics using microphones to achieve flat frequency characteristics, making it difficult to automatically correct and optimize sound reproduction for different speaker devices.
Innovation Solution
An audio reproduction device that includes a signal amplifier, a characteristic measuring device, a structure analyzer, a delay characteristic calculator, a correction parameter generator, and a corrector to measure and correct the input signal based on the speaker device's characteristics, allowing for automatic calculation and application of correction parameters to achieve desired sound characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a measurement microphone is used to measure the reproduced sound from the speaker device, then the frequency characteristic can be made flat by calculating a correction parameter, but the operation becomes complex and requires external measurement tools and manual installation of correction parameters
Solution Approach 1:
The audio reproduction device performs self-measurement of its own output characteristics by analyzing the relationship between the input signal and the output signal from the speaker device. The correction parameter generation unit automatically generates correction parameters based on this self-measured data, eliminating the need for external microphones and manual measurement procedures. The device serves itself by using its own processing capabilities to measure and correct its output characteristics.
Solution Approach 2:
The invention introduces an analysis signal processing unit that acts as an intermediary between the input signal and the correction parameter generation. This unit processes the input signal and compares it with the measured output signal to derive correction parameters automatically, replacing the need for manual microphone-based measurement and parameter installation.
2Measurement precision
If manual measurement and correction parameter installation is performed, then accurate correction can be achieved, but the productivity and ease of use are reduced due to required manual work
Solution Approach 1:
The system automatically performs the entire measurement and correction process without requiring external tools or manual intervention. The correction parameter generation unit is integrated into the audio reproduction device itself, enabling it to self-correct its output characteristics by analyzing its own performance data and automatically generating and applying correction parameters.
Solution Approach 2:
The invention replaces the mechanical/manual process of microphone placement, sound measurement, and parameter installation with an automated signal processing system. The analysis signal processing unit uses digital signal processing techniques to automatically measure characteristics and generate correction parameters, substituting the manual mechanical process with an automated electronic system.
3Adaptability or versatility
If the audio reproduction device adapts to different speaker devices, then the frequency characteristic can be optimized for each device, but the device complexity increases due to need for measurement and correction functions
Solution Approach 1:
The audio reproduction device incorporates a universal correction system that can adapt to different types of speaker devices. The analysis signal processing unit and correction parameter generation unit are designed to work with various speaker configurations by automatically analyzing the specific characteristics of each connected device and generating appropriate correction parameters, making the system universally applicable across different speaker types.
Solution Approach 2:
The system achieves adaptability by dynamically changing correction parameters based on the measured characteristics of each speaker device. The correction parameter generation unit adjusts the parameters according to the specific frequency response and characteristics of the connected speaker, allowing the audio reproduction device to optimize its output for different devices without requiring hardware changes.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present disclosure provides an audio reproduction device that can produce a sound of a desired characteristic from an arbitrary speaker device. The 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.