Audio Frequency Response Compensation Using Human Ear Characteristics
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Solution Overview
Problem
Existing methods for compensating frequency response in audio signals fail to account for individual human ear characteristics and environmental factors, resulting in uneven sound loudness response curves during actual use.
Innovation Solution
A method and device that preset multiple audio signals with different frequencies, calculate compensation gains and filtering coefficients based on minimum audible amplitudes, and adjust frequency response using compensation curves to generate a flat sound loudness response, aligning with human ear characteristics and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If frequency response adjustment is conducted in an anechoic room to achieve flat frequency response, then the frequency response characteristic is flat in the anechoic room, but the frequency response becomes uneven in user's rooms due to sound reflection and absorption from walls and household products
Solution Approach 1:
The patent applies preliminary action by pre-measuring the frequency response characteristics of the speaker in a controlled anechoic environment, then using these measurements to generate compensation curves that are applied in various user environments. The system performs frequency response measurement and compensation curve generation in advance, storing multiple compensation curves for different scenarios, so that when the user plays music, the appropriate compensation is already prepared and applied automatically.
Solution Approach 2:
The patent implements parameter changes by creating multiple compensation curves with different characteristics (e.g., different compensation amounts for low frequencies, mid frequencies, and high frequencies) and selecting/applying the appropriate curve based on the playback environment and user preferences. The system adjusts frequency response parameters dynamically by applying different compensation curves to adapt to various listening conditions.
2Manufacturing precision
If frequency response adjustment compensates only for speaker unevenness, then the speaker's frequency response is corrected, but human ear's unequal loudness perception across different frequencies remains uncorrected
Solution Approach 1:
The patent merges two compensation objectives into a unified approach: it combines speaker frequency response compensation with human ear equal-loudness contour compensation. The compensation curves are designed to simultaneously correct speaker unevenness and account for the human ear's varying sensitivity to different frequencies, particularly enhancing low frequency perception where the ear is less sensitive. This integrated compensation approach addresses both the speaker's deficiencies and the listener's physiological characteristics.
3Ease of manufacture
If conventional frequency response adjustment is used, then the process is simple and quick, but the sound loudness response curve obtained by user is uneven and sound quality is unsatisfactory
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing multiple compensation curves with different characteristics before the user actually uses the system. The complex work of measuring speaker response, analyzing frequency characteristics, and generating optimized compensation curves is performed in advance in a controlled environment. When the user plays music, the system simply selects and applies the appropriate pre-prepared compensation curve, making the user experience simple while achieving high precision sound quality.
Data Source
AI summary
The present disclosure provides a method for compensating frequency response of audio signal, the method includes: presetting n groups of audio signals with different frequencies, acquiring the minimum signal amplitude value heard by user in each group of audio signals; calculating by a preset gain algorithm to acquire corresponding compensation gain, according to the minimum signal amplitude value; for each group of audio signals, calculating by a preset filtering coefficient algorithm to acquire a corresponding filtering coefficient, according to the frequency of the audio signal, the compensation gain and a preset quality factor; generating a frequency response compensation curve of audio signal according to the filtering coefficient corresponding to the n groups of audio signals; and adjusting an acoustic frequency response of the audio signal according to the compensation curve, and outputting the adjusted audio signal. The present disclosure further provides a device for compensating frequency response of audio signal.