Loudness Adjustment via Frequency Domain Signal Processing
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Solution Overview
Problem
Existing loudness adjustment methods fail to accurately match the adjusted loudness with human auditory characteristics and result in inconsistent loudness across different multimedia resources due to neglecting frequency response variations in playback devices.
Innovation Solution
A method and device that convert sound signals into frequency domain signals, acquire a second frequency domain signal based on the device's frequency response information, and adjust the sound signal to achieve a target loudness, ensuring consistency across multiple multimedia resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If loudness adjustment is performed only through sound amplitude or energy without considering frequency response, then the adjustment process is simple, but the adjusted loudness cannot completely match with the auditory characteristics of human beings
Solution Approach 1:
The patent transforms the loudness adjustment from simple amplitude scaling to frequency-domain processing by changing the parameter space. It converts sound signals to frequency domain using FFT, applies frequency-weighted loudness calculation based on human auditory characteristics (equal-loudness contours), and performs adjustment in the frequency domain before inverse transformation, thereby achieving accurate perceptual loudness matching.
2Adaptability or versatility
If loudness adjustment is performed without considering device frequency response, then the adjustment method is universal, but the loudness of sounds heard by the user may be different on different devices
Solution Approach 1:
The patent introduces device-specific frequency response characteristics into the loudness adjustment process. It obtains the frequency response of the current playback device, calculates device-specific loudness values by weighting the frequency domain signal according to both human auditory characteristics and device characteristics, and performs targeted adjustment for each device type, thereby ensuring consistent perceived loudness across different devices.
3Ease of operation
If only the loudness adjustment in a single multimedia resource is considered, then the adjustment is straightforward, but the loudness of multiple multimedia resources may also be inconsistent
Solution Approach 1:
The patent implements a feedback-based loudness normalization system. It calculates the loudness value of each multimedia resource based on frequency domain analysis and human auditory characteristics, compares it with a reference or target loudness level, and determines the appropriate gain adjustment to bring the resource's loudness into alignment with the reference level, thereby ensuring consistency across multiple resources.
Data Source
AI summary
The present application relates to a loudness adjustment method and apparatus, and an electronic device and a storage medium, mainly relating to the technical field of multimedia. The method comprises: converting a sound signal of a multimedia resource into a first frequency domain signal; acquiring a second frequency domain signal based on the first frequency domain signal and frequency response information of a current electronic device, wherein the second frequency domain signal is used for reflecting the loudness of the first frequency domain signal when same is played on the current electronic device; and adjusting the loudness of the sound signal based on the second frequency domain signal and a target loudness, so as to obtain a target sound signal of the multimedia resource.