HRTF Audio Processing With Measurement-Environment Sound Pressure Matching
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Solution Overview
Problem
Existing stereophonic technologies using HRTF can accurately localize sound sources but fail to reproduce the correct sound pressure, leading to discrepancies between headphone playback and the original sound environment, particularly in movie production where standardized sound pressure is crucial.
Innovation Solution
An information processing apparatus records sound pressure reproduction data alongside HRTF data to ensure that the playback sound pressure matches the measurement environment, using a system that includes HRTF file generation and headphone volume adjustment to replicate the sound pressure of a movie theater in a home playback setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If HRTF playback processing is used to localize sound sources, then sound direction localization is improved, but sound pressure reproduction deteriorates
Solution Approach 1:
The patent segments the sound reproduction process into two independent components: HRTF-based directional localization and separate sound pressure control. By recording and reproducing playback sound pressure data alongside HRTF data, the system can independently adjust sound pressure levels for each frequency band without interfering with the directional localization achieved through HRTF processing.
Solution Approach 2:
The patent applies parameter changes by introducing playback sound pressure data that contains frequency-dependent gain information. This allows the system to modify the amplitude parameters of the playback sound across different frequency bands to match the sound pressure characteristics of the measurement environment, while preserving the spatial parameters established by HRTF processing.
2Ease of operation
If headphone volume is arbitrarily adjusted for comfortable listening, then ease of operation is improved, but sound pressure accuracy deteriorates
Solution Approach 1:
The patent performs preliminary action by pre-measuring and recording the playback sound pressure data in the measurement environment before actual use. This recorded data contains the precise gain information needed to reproduce accurate sound pressure levels. When playing back through headphones, the system applies these pre-calculated gains to automatically restore the original sound pressure accuracy without requiring manual volume adjustments by the user.
3Stability of the object's composition
If standardized sound pressure is maintained in movie theaters, then sound pressure consistency is improved, but adaptability to different playback environments deteriorates
Solution Approach 1:
The patent uses copying by recording the playback sound pressure data from the standardized movie theater measurement environment and storing it alongside HRTF data. This creates a digital copy of the theater's acoustic characteristics that can be reproduced on any playback device. The system applies this copied sound pressure information to headphone playback, enabling accurate reproduction of the standardized theater sound pressure without physically being in the theater environment.
Data Source
AI summary
The present technology relates to an information processing apparatus, an information processing method, and a program capable of reproducing a sound pressure of a playback sound in a measurement environment. An information processing apparatus according to one aspect of the present technology records sound pressure reproduction data used to reproduce sound pressure of a speaker as a sound pressure when outputting a playback sound obtained by playback processing using transfer characteristics of sound in a measurement environment where the speaker is installed from an output apparatus prepared in a playback environment together with transfer characteristic data representing the transfer characteristics. The present technology can be applied to a system that performs audio mixing of contents such as movies.