Synaptics

Dual-Mic Far-Field Voice Processor SoC

CX20921
Standalone 2-Mic Far-Field Subsystem with Integrated Low-Power Wake-on-Voice (WoV)
Dual-Mic Far-Field Voice Processor SoC
OVERVIEW
The Synaptics CX20921 is a high-performance, far-field voice input processor System-on-Chip (SoC). The CX20921 is the first product in this category with an integrated voice trigger function that supports a low system power Wake-on-Voice (WoV) function. The device includes two 24-bit microphone Analog-to-Digital Converters (ADCs), a powerful dual core 32- bit hardware Digital Signal Processor (DSP), and integrated power management.

Combined with Synaptics AudioSmart® far-field voice input processing software suite, including Smart Source Pickup (SSP) noise suppression and full-duplex stereo Acoustic Echo Cancellation (AEC), the CX20921 is the ideal turnkey solution for adding voice control, voice search, and Voice over Internet Protocol (VoIP)/speakerphone functionalities to SmartTV, SetTop Box (STB), Smart appliances, digital assistants, and automotive hands-free control and communication systems.

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

 
BLOCK DIAGRAM
CX20921
 
KEY FEATURES
  • Low-power WoV mode with embedded third-party voice wake-up engine
  • Enables high-performance Automatic Speech Recognition (ASR) and excellent voice clarity with only two mics using Synaptics’ AudioSmart voice input processing software, which includes:
    • SSP noise suppression
    • Full-duplex stereo AEC
  • Compatible with multiple leading embedded and serverbased speech recognition vendors
  • Dual far-field, 24-bit, 106dB dynamic range ADCs with mic pre-amplifier:
    • Enables low mic gain for far-field signals without saturation for loud near field signals

APPLICATIONS
  • Voice-controlled Smart TV/STB
  • Smart Bluetooth/WiFi speaker
  • Voice interactive smart appliances
  • Internet of Things (IoT) devices
  • Automotive hands-free control/communication

*Synaptics Authorized Distributor
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