ZL38004

Overview

Simplified Block Diagram

Typical Applications

• Hands-free car kits
• Full duplex speaker-phone for digital telephone
• Echo cancellation for video conferences
• Intercom Systems
• Security Systems

Features & Benefits

• 100 MHz (200 MIPs) voice processor with hardware accelerator
• Dual ΔΣ ADCs with input buffer gain selection programmable to either 8 or 16 kHz sampling
• Dual ΔΣ DACs with output sampling of 8, 16, 44.1 and 48 kHz
• 2048 tap Filter co-processor shared across up to 16 separate functions in 128 tap increments
• Dual function Inter-IC Sound (I2S) or Secondary TDM port
• Primary PCM port supports TDM (ST BUS, GCI or McBSP framing) or SSI modes at bit rates of 128, 256, 512, 1024, 2048, 4096, 8192 or 16384 Kb/sec
• Separate slave (microcontroller) and master (Flash) SPI ports, maximum clock rate = 25 MHz
• 11 General Purpose Input/Output (GPIO) pins
• Programmable tail length range from 16 ms to 256 ms

Firmware Overview

Microsemi AcuEdge™ Technology ZLS38502 - Firmware for Enhanced Hands-free Speaker- Phones

• Selectable Acoustic and Line Echo Cancellers (AEC & LEC) with patented Psycho acoustic Noise Reduction
• Narrow band (8 kHz sampling) and Wide band (16 kHz sampling) operation
• Programmable echo tail cancellation length from 8 to 256 ms
• AEC and Noise Reduction bypass for handset operation
• Psycho acoustic Noise reduction - up to 20 dB for white noise and up to 30 dB in a typical car environment
• Non-linear Echo Controller
• 16/22 band equalizer in the Sout and Rout path
• Handles up to 6 dB line echo return loss measured from Sout to Rin
• Programmable Tone Generator to generate, DTMF, SF, MT and tone ringer
• No divergence due to double-talk (patented Adaption Control)
• Programmable gain at R_in, S_in and S_out to accommodate system requirements
• User gain control provided on speaker range (Rout) from -21 dB to +24 dB in 0.375 dB steps
• Superior voice quality with patented Non-Linear Processor (NLP)
• Patented Clipping Compensation
• Patented Narrow-band signal divergence protection
• Patented Anti-howling - prevents oscillation in echo canceller audio path
• Speaker path AGC (R_out)
• G.169 ALC in the Sin to S_out path

Microsemi AcuEdge™ Technology ZLS38503 - Firmware for Voice Prompting and Messaging

• Voice recording (messaging) and playback (voice prompting)
• DTMF receiver
• Tone Generator (preprogrammed DTMF + user defined tones)
• Burst mode
• Optional twist
• Caller ID detection (Type 2)
• Call progress tone detection
• VAD
• Easy file manage
• Requires very few microprocessor resources