Portable sound projector

By using attitude sensors and acoustic processing units in portable acoustic devices and applying the technology of inverse head transfer function, the problem of volume change when the device rotates is solved, and the stability and consistency of sound quality is achieved.

JP2025049817APending Publication Date: 2025-04-04CEAR INC
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Patent Information

Application Number
JP2023158268
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-22
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

When the portable sound generator rotates, the volume between the frequency bands may change, causing the listener to feel uncomfortable sound quality changes when switching from stereo mode to mono mode.

Method used

The attitude sensor is used to detect the attitude change of the device, and a transfer function is applied through the acoustic processing unit to keep the acoustic characteristics of the acoustic signal to the fixed point in the real space unchanged. The transfer function includes inverse filtering of the head transfer function, which is stored in the table of each posture change.

Benefits of technology

Effectively reduces sound quality discomfort caused by changes in the equipment direction, ensuring that the acoustic characteristics remain consistent when the equipment posture changes.

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Abstract

To provide a portable sound projector that reduces the discomfort caused by changes in sound quality that occur when the orientation of the projector case is changed.SOLUTION: A portable sound projector 1 includes multiple speakers 21, 22 and an attitude sensor 3 that detects attitude changes of the housing. An acoustic processor 6 applies a transfer function H-1(ψ,θ) that maintains the acoustic characteristics of a sound wave signal that reaches a fixed point in real space to two or more channels of acoustic signals in response to the attitude change (ψ, θ) detected by the attitude sensor 3.SELECTED DRAWING: Figure 3
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