Arc-Shaped Pillar Measurement Device for Head-Related Transfer Function

The measurement system divides the frequency range into multiple bands and assigns different speakers to different frequency ranges. Each speaker is responsible for a specific frequency segment, allowing the system to cover the entire audible spectrum without requiring a single speaker to handle all frequencies, thereby reducing the number of speakers needed while maintaining measurement precision.

The patent introduces a temporal dimension by using multiple measurement positions arranged in an arc. Instead of requiring multiple speakers at different frequencies simultaneously, the system uses a single speaker that moves through different positions around the subject, capturing acoustic data from various angles and frequencies sequentially. This transforms a spatial-frequency problem into a time-based measurement approach.

The measurement system continuously captures acoustic data as the speaker moves through different positions around the subject without interruption. By maintaining continuous measurement action and using the rotatable chair to dynamically change the relative position between the speaker and subject, the system obtains comprehensive head-related transfer function data in a single continuous session, eliminating the need for multiple separate measurements and significantly reducing total measurement time.

The patent employs a rotatable chair that dynamically changes the position of the subject relative to the speaker during measurement. This dynamic repositioning allows the system to capture acoustic responses from multiple angles and frequencies in a single measurement cycle, transforming a static, time-consuming measurement process into a dynamic, efficient one that obtains comprehensive data quickly.

The measurement system uses an asymmetric arrangement where speakers are positioned at specific locations around the subject rather than uniformly in all directions. The speakers are arranged at angles that avoid direct line-of-sight reflections to the subject's ears, creating an asymmetric configuration that minimizes harmful reflections while still capturing sufficient acoustic data for accurate head-related transfer function measurement.

The patent exploits the natural reflection characteristics of the environment by carefully selecting speaker positions and measurement angles. Instead of trying to eliminate reflections, the system positions speakers and microphones such that useful reflected sounds provide additional information about the acoustic field, converting potential harmful reflections into beneficial measurement data that enhances the accuracy of the head-related transfer function.