Sound Field Volume Correction for Changing Room Acoustics
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Solution Overview
Problem
Conventional sound field control devices fail to consistently achieve intended sound field effects due to variations in reproduction environments, such as differences in speaker arrangement and room acoustics, leading to either overpowering or weak sound field effects.
Innovation Solution
A sound field control device that adjusts the volume of sound field effect sounds based on the reproduction environment by calculating and correcting the ratio of direct sound to total sound energy, using stored sound field effect information and acoustic data to simulate desired acoustic conditions, and limits the volume correction to prevent excessive sound field effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sound field effect volume is increased to enhance the immersive experience, then the practical value of the sound field effect function is improved, but the sound field effect sounds become harsh and interfere with listening
Solution Approach 1:
The patent dynamically adjusts the volume parameter of sound field effect sounds based on the measured proportion of direct sound in the reproduction environment. By changing this parameter according to environmental conditions, the system achieves optimal sound field effect strength without causing harshness or listening interference.
Solution Approach 2:
The system measures the actual proportion of direct sound in the reproduction environment and uses this feedback information to automatically adjust the volume of sound field effect sounds. This closed-loop control ensures that the sound field effect is appropriately balanced with the direct sound, preventing harshness while maintaining immersion.
2Object-affected harmful factors
If the sound field effect volume is decreased to avoid harshness, then the listening comfort is improved, but the practical value of the sound field effect function is reduced
Solution Approach 1:
The system adjusts the volume parameter of sound field effect sounds based on the measured direct sound proportion in the reproduction environment. This dynamic parameter adjustment ensures that the sound field effect remains audible and practical while avoiding harshness, thus maintaining both listening comfort and functional value.
Solution Approach 2:
By continuously measuring the proportion of direct sound and using this feedback to adjust the sound field effect volume, the system automatically finds the optimal balance between listening comfort and practical value, ensuring the sound field effect is neither too weak nor too harsh.
3Device complexity
If the sound field effect is adjusted without considering reproduction environment variations, then the device complexity is reduced, but the consistency of sound field effect across different environments deteriorates
Solution Approach 1:
The system automatically measures the proportion of direct sound in the reproduction environment and self-adjusts the volume of sound field effect sounds without requiring manual intervention. This self-service approach maintains device simplicity while achieving consistent sound field effects across different reproduction environments.
Solution Approach 2:
The system uses feedback from environmental measurement (direct sound proportion) to automatically adjust sound field effect parameters, eliminating the need for complex manual adjustment processes while ensuring consistent performance across varying reproduction environments.
Data Source
AI summary
A sound field control device has an input part through which an audio signal is input. A storage part stores a first factor obtained by calculating a proportion of energy of direct sound in total energy of sound collected in an adjustment environment within a predetermined time. A sound field generation part generates a sound field effect sound from the audio signal input through the input part, and outputs the sound field effect sound at a volume corresponding to the first factor. A calculation part calculates a second factor which represents a ratio of an energy of a direct sound to an energy of sound which is collected in a reproduction environment and which contains the direct sound. A correction part corrects the volume of the sound field effect sound based on a ratio between the first factor and the second factor.