Binaural Sound Signal Modulation for Stable Engine Sound Localization
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Solution Overview
Problem
Existing sound image localization technologies face challenges in stabilizing sound source localization, particularly in environments where interaural phase differences cannot be eliminated, leading to unstable sound image positioning in vehicle interiors.
Innovation Solution
A signal processing device and system that modulates sound signals using a modulation parameter based on interaural phase differences, incorporating a signal processor with a modulator and phase adjuster to adjust frequency shifts and phases, ensuring sound signals are in phase between ears, thereby stabilizing sound image localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase adjustment processing is performed to make sound signals in phase between ears, then sound image localization is improved, but the problem remains in environments where interaural phase differences cannot be eliminated
Solution Approach 1:
The patent changes the parameter being adjusted from phase to frequency. By performing frequency shift processing based on interaural time difference, the system transforms the sound signal parameters to achieve sound image localization without requiring phase alignment, thus resolving the contradiction between localization accuracy and stability in environments where phase differences cannot be eliminated
Solution Approach 2:
The patent replaces the traditional phase adjustment mechanism with a frequency shift mechanism. Instead of adjusting the phase of sound signals to achieve localization, the system uses frequency shifting based on interaural time difference, substituting one physical mechanism for another to achieve the same localization goal while improving reliability
2Measurement precision
If modulation processing is performed using interaural phase difference, then sound image localization is further improved, but device complexity increases
Solution Approach 1:
The patent makes the frequency shift amount adjustable based on different conditions (interaural time difference values). The same frequency shift processing mechanism serves multiple functions: it can adapt to different listening environments, compensate for varying interaural time differences, and maintain sound image localization accuracy across diverse scenarios, thereby justifying the processing complexity through enhanced versatility
Data Source
AI summary
A signal processing device includes: a processor; and a memory having instructions. The instructions, when executed by the processor, cause the signal processing device to perform operations. The operations include performing a modulation processing of modulating a sound signal by using a modulation parameter based on an interaural phase difference at a listening position of the sound signal.