Human Body Sound Transmission via Destructive Interference
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Solution Overview
Problem
Conventional sound transmission systems using the human body as a propagation medium require separate transmitters and receivers, limiting convenience and mobility, as the audio signal can only be heard when the receiver is attached to the body, and the sound may not be discreet.
Innovation Solution
A sound transmission system employing two signal transmitters generating high-frequency signals with opposite phases, which combine with audio signals and are transmitted through the human body, utilizing destructive interference to eliminate the high-frequency components around the ears, allowing the audio signal to be heard without additional receivers, and enhancing mobility and security by preventing sound from spreading into the air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a receiver is attached to the human body to receive the transmitted electric signal, then the audio signal can be heard, but the system becomes complex and mobility is limited
Solution Approach 1:
The invention extracts and eliminates the high-frequency carrier signal from the human body through destructive interference, leaving only the audio signal to be heard. This removes the need for a separate receiver device, simplifying the system and enhancing mobility
Solution Approach 2:
The transmitter is designed to perform multiple functions: it modulates the audio signal onto a high-frequency carrier, transmits it through the body, and the same transmitter structure enables the demodulation process through interference cancellation, eliminating the need for separate receiver hardware
2Reliability
If the audio signal is transmitted through the human body, then security is improved, but the sound quality and stereo effects are degraded
Solution Approach 1:
The invention creates localized destructive interference zones specifically around the ear area where the carrier signal cancels out, while preserving the audio signal integrity. This localized approach maintains sound quality and stereo effects in the critical listening region while still providing secure transmission through the body
Solution Approach 2:
The high-frequency carrier signals induce vibrations in the human body tissues, and through controlled interference, these vibrations cancel the carrier component while allowing the audio-frequency vibrations to reach the ear, maintaining audio fidelity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables users to receive audio signals directly through the human body without additional receivers, increasing mobility and security by ensuring the sound is only perceivable to the intended user, while maintaining sound quality and sterophonic effects.
Implementation Method 1
The high frequency signals among the combined signals output by the first and second signal transmitters are eliminated by interference around the ears of the human body
Data Source
AI summary
The present invention relates to a sound transmission system using a human body as a propagation medium. The transmission system includes a first signal transmitter and a second signal transmitter respectively generating signals having frequencies corresponding to each other, the first and second signal transmitters being coupled to the human body, wherein the first and second signal transmitters respectively generate high frequency signals having an opposite phase to each other, and the respective signal transmitters combine the audio signals and the high frequency signals to transmit the combined signals to the human body. The respective signal transmitters combine the generated audio signals and high frequency signals, adjust an output phase of the combined signals, and transmit the combined signals through the human body.