Audio Driver Frequency Response Measurement With Simultaneous Band Output
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Solution Overview
Problem
Existing methods for measuring the frequency response of multiple audio output drivers in headphones or similar devices require time-sharing sound output and measurement, leading to noticeable silence in unmeasured drivers, prolonged measurement time, and potential discomfort due to strange noises.
Innovation Solution
A signal processing device with an output control section, frequency analysis section, and frequency response compilation section generates multiple audio outputs with different frequency bands simultaneously, allowing for concurrent frequency response measurement without noticeable silence or discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time-sharing sound output and measurement is used for each driver, then measurement can be performed sequentially, but measurement time becomes considerably long
Solution Approach 1:
The patent merges the sound output functions of multiple drivers with their measurement processes into a simultaneous operation. Multiple drivers output sounds with different frequency bands at the same time, and the measurement system collects and analyzes the combined sound signals, allowing frequency response measurement of all drivers to be completed in parallel rather than sequentially.
Solution Approach 2:
The patent segments the frequency spectrum into different frequency bands and assigns each band to specific drivers. By using frequency division multiplexing, the system can distinguish which driver produced which frequency component in the combined sound signal, enabling independent measurement of each driver's frequency response even when they operate simultaneously.
2Measurement precision
If time-sharing measurement is used for each driver, then individual driver measurement is possible, but other drivers become silent making measurement noticeable to user
Solution Approach 1:
The patent combines the sound output of multiple drivers during measurement, so that when one driver is being measured, other drivers simultaneously output sounds in different frequency bands. This prevents any driver from being silent during measurement, making the measurement process imperceptible to the user who experiences continuous audio output.
Solution Approach 2:
The patent changes the frequency band parameters of different drivers during measurement. Each driver outputs sound in a specific frequency range, and the measurement system identifies which driver corresponds to which frequency band. This parameter differentiation allows simultaneous measurement while maintaining continuous sound output across all frequency ranges.
3Measurement precision
If sequential driver measurement is performed, then each driver can be measured independently, but strange noise occurs due to D/A conversion switching
Solution Approach 1:
The patent maintains continuous sound output and D/A conversion operation for all drivers throughout the measurement process. By keeping the D/A converters continuously active and all drivers continuously outputting sound in their respective frequency bands, the system eliminates the abrupt switching between drivers that causes strange noises during sequential measurement.
Data Source
AI summary
Disclosed is a technology that, in a case where the frequency response of multiple audio output drivers is measured, shortens the time of measurement while making it difficult for a user to notice that the frequency response is being measured, and reduces the user's sense of discomfort caused by the measurement. A signal processing device according to the disclosed technology includes an output control section, a frequency analysis section, and a frequency response compilation section. The output control section causes multiple audio output drivers disposed in an audio output device to generate multiple audio outputs with different combinations of output frequency bands of sound signals that are to be outputted respectively from the audio output drivers. The frequency analysis section makes a frequency analysis of a collected-sound signal upon generation of each of the multiple audio outputs, and obtains the frequency response of each of the multiple audio outputs. The frequency response compilation section compiles the frequency response of each of the audio output drivers from the frequency response of each of the audio outputs that is obtained by the frequency analysis section.