Audience, a Silicon Valley start-up company that has modeled the function of the cochlea of the inner ear, plans on Monday to introduce an integrated circuit intended to improve the sound quality of cellphones.

The chip runs software that digitizes sound and represents it as a three-dimensional matrix, making it possible for the circuitry to identify and then suppress noise picked up by the cellphone microphone while leaving the speaker’s voice intact.

The company says the system has the ability to identify and block up to 25 decibels of extraneous sound.

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