OPEN ACOUSTIC DEVICE

Smart overview of the Invention

The open acoustic device is designed to enhance user comfort and listening experience by addressing the limitations of traditional in-ear devices. It features a fixing structure that secures the device close to the user's ear without obstructing the ear canal. This design ensures comfort during prolonged use while allowing ambient noise to be perceived naturally. The device includes a sophisticated noise reduction system that utilizes a microphone array, signal processor, and speaker to minimize environmental noise interference.

Components and Functionality

Key components of the device include a first microphone array, a signal processor, and a speaker. The microphone array captures environmental noise, which is then processed by the signal processor to determine a primary route transfer function. This function helps estimate the noise signal at the user's ear canal, enabling the generation of a noise reduction signal. The speaker outputs an acoustic wave based on this signal to effectively cancel out the unwanted noise, enhancing audio clarity for the user.

Technical Field and Background

The technology falls within the acoustic field, focusing on open acoustic devices that do not block the ear canal. Unlike in-ear devices that can be uncomfortable over long periods, open acoustic devices offer a more comfortable alternative without compromising on sound quality. However, these devices often face challenges in effectively reducing environmental noise, which this invention aims to overcome by improving noise reduction capabilities.

Noise Reduction Mechanism

The device employs an advanced noise reduction mechanism that involves determining the direction of noise sources using multiple microphones in the array. The signal processor calculates a primary route transfer function based on environmental parameters and uses this to estimate and counteract the noise at the ear canal with an opposing acoustic wave. This method allows for effective noise cancellation across various frequency ranges, significantly improving user experience.

Implementation and Benefits

Implementation involves strategically placing the device near the user's ear using a non-intrusive fixing structure. The innovative use of signal processing allows for precise noise reduction, particularly effective in frequencies between 150 Hz and 2000 Hz, achieving a reduction depth of 5 dB to 25 dB. This capability enhances both music listening and call experiences by minimizing external interference while maintaining user comfort.