Binaural Beat Sound Output Device Stereo Field Preservation
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Solution Overview
Problem
Conventional binaural beat devices suffer from a sense of rejection and monotony due to the conversion of stereo audio signals to mono, leading to a deteriorated sound quality and loss of stereo sense, as they fail to effectively apply binaural beats to specific frequency bands without causing a beat phenomenon.
Innovation Solution
A binaural beat sound output device and method that includes a sound source input unit, mono conversion unit, frequency control unit, and output audio generation unit, which analyze and shift specific frequency bands to generate stereo output signals, allowing for user-controlled brain wave induction while maintaining a stereo sound field, using a brain wave sensor and heart rate sensor to adjust frequency shifts and reproduction speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stereo audio signals are converted to mono signals to generate binaural beats, then brain wave induction is achieved, but sound quality deteriorates and stereo sense is lost
Solution Approach 1:
The patent divides the audio signal processing into separate left and right channel treatments. Instead of converting the entire stereo signal to mono, it processes each channel independently to generate binaural beats, preserving the stereo structure while achieving brain wave induction effects.
Solution Approach 2:
The patent applies binaural beat generation locally to specific frequency bands within the stereo signal rather than globally to the entire signal. This allows selective modification of certain frequency components while maintaining the overall stereo sound quality and spatial characteristics.
2Reliability
If frequency shift is applied to generate binaural beats, then desired brain wave states are induced, but beat phenomenon causes sense of rejection and monotony
Solution Approach 1:
The patent dynamically adjusts the frequency shift amounts and binaural beat parameters based on the input music signal characteristics and desired brain wave state. This dynamic adaptation prevents monotony by varying the beat patterns while maintaining effective brain wave induction.
Solution Approach 2:
The patent changes multiple parameters including frequency shift amounts, beat frequencies, and signal mixing ratios to optimize both brain wave induction effectiveness and auditory comfort. By adjusting these parameters, it minimizes the beat phenomenon while maintaining the desired neurological effects.
3Loss of information
If stereo sound source is maintained to preserve sound field, then sound quality is improved, but effective binaural beat application becomes difficult
Solution Approach 1:
The patent operates in the frequency domain rather than simply mixing time-domain signals. By applying frequency shifts and processing in the spectral domain, it can maintain stereo spatial information while effectively generating binaural beats through precise frequency manipulation.
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
The solution provides an improved sound field that minimizes the beat phenomenon and suppresses sound quality deterioration, allowing for effective induction of desired brain wave states without the sense of rejection or monotony, while maintaining a stereo sound source and preventing distortion.
Implementation Method 1
A binaural beat is the principle of inducing a desired brain wave to the brain using a difference between two frequencies... the brain combines these two sounds with each other in the brain to accept a difference of 1 Hz
Implementation Method 2
generating a first stereo output signal by removing the specific frequency band of the first stereo sound source signal and adding the specific frequency band of the first mono sound source signal
Data Source
AI summary
The present invention relates to a binaural beat sound output device having an improved sound field and a method therefor and, more specifically, to: a brainwave sound output device using binaural beats, which receives music desired by a user and applies binaural beats to a specific frequency band thereof, so that the device can provide the music through a stereo sound source while inducing a desired brainwave state by the stereo sound source, and thus can improve the sound field without the sense of rejection or monotony to the music; and a method therefor.