ZL38002 PRODUCT PROFILE
AEC with Noise Reduction for Digital Hands-Free CommunicationProduct Status: Production
Overview
The ZL38002 device is comprised of an acoustic echo canceller and the necessary control functions for operation. The ZL38002 guarantees clear signal transmission in both transmit and receive audio path directions to ensure reliable voice communication, even when low level signals are provided. The ZL38002 does not use variable attenuators during double-talk or single-talk periods of speech, as do many other acoustic echo cancellers for speakerphones. Instead, the ZL38002 provides high performance full-duplex operation similar to network echo cancellers. This results in users experiencing clear speech and uninterrupted background signals during the conversation and prevents subjective sound quality problems associated with "noise gating" or "noise contrasting".
The ZL38002 uses an advanced adaptive filter algorithm that is double-talk stable, which means that convergence takes place even while both parties are talking. This algorithm allows continual tracking of changes in the echo path, regardless of double-talk, as long as a reference signal is available for the echo canceller.
The echo tail cancellation capability of the acoustic echo canceller has been sized appropriately (112 ms) to cancel echo in an average sized office with a reverberation time of less than 112 ms.
Simplified Block Diagram
Features & Benefits
- 112 ms acoustic echo canceller
- Up to 12 dB of noise reduction
- Works with low cost voice codec. ITU-T G.711 or signed mag µ/A-Law, or linear 2's compliment
- Advanced NLP design - full duplex speech with no switched loss on audio paths
- Fast re-convergence time: tracks changing echo environment quickly
- Adaptation algorithm converges even during Double-Talk
- Designed for exceptional performance in high background noise environments
- Howling prevention stops uncontrolled oscillation in high loop gain conditions
- User gain control provided for speaker path (-24 dB to +21 dB in 3 dB steps)
- Adjustable gain pads from -24 dB to +21 dB at Xin, Sin and Sout to compensate for different system requirements
- AGC on speaker path
- Handles up to -6 dB acoustic echo return loss (with the appropriate gain pad settings)
- Idle channel noise suppression
- Each port may operate independently in companded format or linear format
- Bootloadable for future factory software upgrades
Technical Documents
Documentation
Packaging Outline Drawings
Product Previews
Tools & Software
Applications
Typical Applications
- Hands free car kits Full duplex speaker-phone for digital telephone
- Echo cancellation for video conferencing
- Security systems
- Intercom systems (door entry, elevator, and restaurant drive-through)
Packaging & Availability
Product Packaging & Availability
| Part Number |
Package Type |
Pin Count |
Lead-Free Option |
Shipping Option(s) |
Lead Time(wks) |
Status |
|---|---|---|---|---|---|---|
| ZL38002DGE1 | SSOP | 36 | Pb-free-Matte Tin | Tubes. Bake & Drypack | 8 Week(s) | Production |
| ZL38002DGF1 | SSOP | 36 | Pb-free-Matte Tin | Tape & Reel. Bake & Drypack | CONTACT ZARLINK | Production |
| ZL38002QDG | TQFP | 48 | Trays. Bake & Drypack | 26 Week(s) | Production | |
| ZL38002QDG1 | TQFP | 48 | Pb-free-Matte Tin | Trays. Bake & Drypack | 6-8 weeks | Production |
Packaging Information
Support
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