Sound Processing Device for Flexible Reproduction via Space-Adaptive Parameters
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Solution Overview
Problem
Existing sound processing technologies using head-related transfer functions (HRTFs) struggle to flexibly reproduce sound due to a fixed reference space, making it difficult to achieve desired sound reproduction.
Innovation Solution
A sound processing device that acquires parameters related to sound propagation from actual measurement data, adjusts these parameters based on the intended reproduction space, and generates new sound data for flexible reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed reference space is used for sound reproduction, then the sound reproduction process is simple, but the flexibility to reproduce desired sound in different spaces is poor
Solution Approach 1:
The patent applies dynamics by making the reference space adjustable rather than fixed. The sound processing device allows selection of different reference spaces (e.g., small room, medium room, large room, outdoor) based on the desired reproduction environment. This enables the system to adapt to different spatial requirements while maintaining a relatively simple processing framework by switching between pre-defined space configurations.
Solution Approach 2:
The patent utilizes parameter changes by modifying sound field parameters (such as reverberation time, reflection coefficients, and spatial characteristics) according to the selected reference space. The adjustment part changes these acoustic parameters to match the characteristics of different spaces, enabling flexible sound reproduction without requiring complete reprocessing for each space.
2Measurement precision
If HRTF acquired by dummy head microphone is used directly, then the processing is straightforward, but the sound reproduction does not match the listener's specific environment
Solution Approach 1:
The patent introduces an intermediary processing step between the dummy head microphone HRTF and the final sound output. The HRTF conversion part acts as a mediator that transforms the generic dummy head HRTF into a customized HRTF specific to each listener's head and ear characteristics. This intermediary processing enables accurate sound reproduction tailored to individual listeners while starting from a straightforward dummy head measurement.
Solution Approach 2:
The patent applies preliminary action by pre-acquiring HRTF data from a dummy head microphone and storing it for later use. This pre-acquired HRTF serves as a foundation that can be efficiently converted and customized for different listeners without requiring new measurements each time, thus balancing accuracy with processing efficiency.
Data Source
AI summary
There is provided a sound processing device that includes an acquisition part that acquires parameters relating to a way of sounding of sound from first sound data obtained by actual measurement, an adjustment part that adjusts the parameters in accordance with a space for reproduction, a synthesis part that generates third sound data from second sound data on the basis of parameters having been adjusted by the adjustment part, and an output part that reproduces the third sound data.