ZL38AMB

Overview

Simplified Block Diagram

Typical Applications

• IP Camera HD Voice 2 way audio 

Features & Benefits

• DSP with voice specific Hardware Accelerators
• Dual ΔΣ DACs with output sampling up to 48 kHz and internal output drivers
• 4 Single-Ended or 2 Differential Output Amps
• Two Digital Microphone inputs supporting up to 4 Microphones
• Two TDM ports shared between PCM and Inter-IC Sound (I2S)
• Provide sample rate conversion and synchronous TDM bus operation
• SPI Slave port for host processor interface
• Master SPI ports for serial Flash interface
• 14 General Purpose Input/Output (GPIO) pins
• General purpose UART port
• Boots from SPI, UART, or Flash allowing easy firmware updates
• Can run unattended (controllerless), self booting into a configured operational state
• Ultra low power standby mode

Firmware Overview

Microsemi AcuEdge™ Technology ZLS38AMB - Firmware for IP Camera

• Far Field Microphone Processing
• Microphone Beamforming
• Sound Location Estimation
• Wideband and Narrowband Acoustic Echo Cancellation (for up to 3 microphones)
• Full duplex operation supports AEC (up to 256 ms) in Narrowband (8 kHz sampling) or Wideband (16 kHz sampling) operation
• Non-linear echo cancellation provides higher tolerance for speaker distortions
• Advanced Noise Reduction reduces background noise from the near-end speech signal using Psycho-Acoustic techniques
• Signal mixing
• 48 kHz stereo music record and playback with 16 kHz voice processing
• Howling detection/cancellation
• Prevents oscillation in AEC audio path
• Various encoding/decoding options:
• 16-bit 2’s complement (linear)
• G.711 A/μ law
• G.722
• Comfort noise generation
• 48 kHz bypass mode