Active noise-reduction earphone using a 3-level digital signal

Active Noise Cancelling Technology.

This technology utilizes a three-level digital signal to reduce loop delay, either using a three-level PWM (pulse width modulation) signal or a three-level PDM (pulse density modulation) signal. This reduces loop delay, thereby increasing the frequency range for active noise reduction in earphones receiving digital audio signals.

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Key Features :

• Uses a three-level digital signal.
• Attenuation is achieved by reducing loop delay.
• This effect increases the peak frequency of noise signals from 500 Hz to over 2,500 Hz.
• This allows you to eliminate ambient noise in subways and airports, allowing you to hear only the desired audio signal.

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