Signal processing device and signal processing method
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Solution Overview
Problem
Existing systems that integrate loudspeakers and actuators in seats can cause uncomfortable vibrations to users, particularly when reproducing certain types of sound, as they often transmit vibrations and sound waves in the same frequency band to the user, leading to unpleasant experiences.
Innovation Solution
A signal processing device that separates the output of acoustic signals to loudspeakers and actuators by frequency bands, ensuring that vibrations and sound waves are optimized for specific areas of the body and frequency ranges, thereby reducing uncomfortable vibrations. This is achieved through the use of filters and strategic placement of loudspeakers and actuators within the seat, allowing for the output of specific acoustic signals to actuators and other signals to loudspeakers, including the use of ultrasonic signals for enhanced effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If acoustic signals are transmitted to both loudspeakers and actuators in the same frequency band, then the system can reproduce music with full frequency range, but uncomfortable vibrations occur to the user
Solution Approach 1:
The patent divides the frequency spectrum into distinct bands and assigns different output devices to different bands. Specifically, it separates the music signal into low-frequency components (for actuators) and high-frequency components (for loudspeakers), preventing overlapping frequency transmission that causes uncomfortable vibrations while maintaining comprehensive frequency coverage.
Solution Approach 2:
The patent applies different signal processing characteristics to different frequency bands. By tailoring the output characteristics of each frequency band to the appropriate device (actuators for low frequencies, loudspeakers for high frequencies), it optimizes the local quality of each frequency range while avoiding the harmful effects of simultaneous full-band transmission to both devices.
2Object-affected harmful factors
If all acoustic signals are output to loudspeakers, then vibration comfort is improved, but the immersive audio experience and physical sensation are reduced
Solution Approach 1:
The patent segments the audio signal processing into two distinct paths: one for vibration transmission through actuators and another for acoustic transmission through loudspeakers. This segmentation allows each device to operate in its optimal frequency range, providing both vibration comfort and immersive audio experience simultaneously.
Solution Approach 2:
The patent combines the output of loudspeakers and actuators to create a unified audio reproduction system. By merging the acoustic field from loudspeakers with the vibrational field from actuators, it delivers a comprehensive audio experience that engages both hearing and tactile sensation without causing uncomfortable vibrations.
3Productivity
If the system transmits vibrations and sound waves in the same frequency band, then equipment utilization is maximized, but user comfort deteriorates
Solution Approach 1:
The patent segments the frequency spectrum to assign different devices to different frequency ranges, ensuring both devices are actively utilized. This segmentation prevents frequency overlap that would cause uncomfortable vibrations while maintaining high equipment utilization by giving each device its optimal operating band.
Solution Approach 2:
The patent changes the frequency parameter of the signals transmitted to different devices. By transforming the signal characteristics (frequency content) based on the target device, it maximizes equipment utilization while avoiding the harmful effects of identical frequency transmission to both devices.
Data Source
AI summary
A signal processing device for reproducing a musical piece from one or more loudspeakers and one or more actuators that are provided in a seat includes: an obtainer that obtains data of a plurality of tracks that constitute the musical piece; and an outputter that outputs an acoustic signal included in data of a track among data of the plurality of tracks to the one or more actuators, and outputs an acoustic signal included in data of another track among the plurality of tracks to any loudspeaker among the one or more loudspeakers.