CX20921 AudioSmart Data Sheet

Introduction

Conexant Confidential

03/11/15

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Introduction

Overview

The CX20921 is a high-performance, far field voice input processor SoC. The CX20921 is the first product

in this category with an integrated voice trigger function that supports a low system power WoV function.

The device includes 24-bit microphone ADCs, a powerful dual core 32-bit hardware DSP, and integrated

power management. Combined with Conexant’s advanced far field AudioSmart software, the CX20921 is

the ideal turnkey solution for adding voice control, voice search, and VoIP functionalities to SmartTV, STB,

automotive hands-free systems, and Smart appliances.

The CX20921 device supports a microphone array with up to two synchronized ADCs and programmable

pre-amplifiers. Each pre-amplifier is paired with a dedicated bias supply to eliminate crosstalk. The entire

input path guarantees 106dB dynamic range, which maximizes speech-to-noise ratio with low boost and

prevents microphone saturation.

Conexant's proprietary far field AudioSmart software takes advantage of the built-in hardware to deliver a

superior voice interactive experience in the most challenging room environments. The voice processing

chain also supports multi-thread processing streams, which are independently optimized for voice

communication and automatic speech recognition.

When ADC and DSP are active in the WoV mode, the device consumes less than 70mW, which is well

below the 0.5W EC 1275/2008 requirement for standby power.