Filter Generation Device S/N Ratio Measurement
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Solution Overview
Problem
The impulse response measurement process is burdened by disturbances such as background noise and power supply noise, requiring multiple measurements and synchronous additions to improve the S/N ratio, which is time-consuming and cumbersome for users.
Innovation Solution
A filter generation device and method that measures spatial acoustic transfer characteristics, generates filters based on these characteristics, and reduces user burden by adjusting the number of synchronous additions, using a dummy head for configuration measurement to increase additions and correct personal measurement data, thereby reducing measurement time and noise effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple synchronous additions are performed to improve S/N ratio, then measurement precision is improved, but measurement time increases and user burden increases
Solution Approach 1:
The system performs configuration measurement in advance using a dummy head to obtain reference transfer characteristics. This preliminary action allows the actual personal measurement to use fewer synchronous additions (e.g., 1-4 times) while still achieving accurate results by correcting with the pre-obtained reference data, thereby reducing measurement time and user burden.
Solution Approach 2:
The dummy head measurement serves as an intermediary reference that mediates between the actual personal measurement and the final transfer characteristics. By introducing this intermediate reference measurement, the system can achieve high precision with fewer actual measurements on the user, resolving the contradiction between measurement precision and time consumption.
2Measurement precision
If multiple synchronous additions are performed to attenuate noise, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The configuration measurement using a dummy head is performed in advance, preparing reference transfer characteristics before the actual personal measurement. This allows the user's measurement to be completed quickly with minimal synchronous additions (1-4 times), significantly reducing user burden while maintaining noise attenuation through the correction process using pre-obtained reference data.
3Manufacturing precision
If the number of synchronous additions is increased to improve transfer characteristic accuracy, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The system performs configuration measurement in advance to obtain reference transfer characteristics with high accuracy through multiple synchronous additions. This preliminary high-precision measurement enables the actual personal measurement to achieve sufficient accuracy with fewer additions, thereby improving overall measurement efficiency while maintaining transfer characteristic accuracy.
Solution Approach 2:
The dummy head measurement creates a reference copy of the transfer characteristics that can be used to correct and enhance the accuracy of the actual personal measurement. This copying approach allows the system to achieve high manufacturing precision in transfer characteristics without requiring multiple actual measurements on the user, thus improving productivity.
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 allows for accurate filter generation with reduced user burden, effectively attenuating noise and improving sound localization quality by stabilizing transfer characteristics and reducing the impact of disturbances.
Implementation Method 1
microphones placed on the listener's ears... record impulse sounds when driving speakers
Implementation Method 2
the impulse response measurement process carries out impulse response measurement a plurality of times under the same conditions and then performs synchronous addition of sound pickup signals picked up by microphones
Data Source
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AI summary
A processor (210) of a filter generation device according to this embodiment includes a first synchronous addition unit (213) that generates a first synchronous addition signal, a second synchronous addition unit (214) that performs synchronous addition of sound pickup signals acquired with a microphone worn on an object or a person other than a listener with a second number of synchronous additions larger than a first number of synchronous additions and thereby generates a second synchronous addition signal, a first transform unit (220) that transforms the first and second synchronous addition signals into frequency domain data so as to acquire first and second spectrums corresponding to the first and second synchronous addition signals, a first correction unit (222) that corrects data of a first spectrum in a correction band and thereby generates a third spectrum, and a first inverse transform unit (223) that inversely transforms the third spectrum into time domain data.