Zarlink ZL38015回声消除解决方案

        Zarlink公司的ZL38015是四路语音处理器硬件平台,集成了Zarlink的语音处理器(ZVP)DSP内核以及各种外设,包括2个PCM口,2048抽头滤波器的协处理器,两个辅助计时器和一个看门狗计时器,9个GPIO,UART,主/从SPI口和主/从顶时区块.

      固件ZLS38233包括了集成了DTMF收发器(Tx/Rx)的四路回声消除器(VCE).广泛应用在无线本地网基站,基于VoIP和无线PBX系统, 回声消除池,客户端设备(CPE),综合接入鹅1以及SOHO网关等.本文介绍了ZL38015和ZLS38233的主要性能,方框图以及VoIP网关应用方框图.

      The ZL38015 is a four channel Voice-Processor hardware platform designed to support advanced voice and digital signal processing applications available from Zarlink Semiconductor. 

      The ZL38015 platform integrates Zarlink’s Voice Processor (ZVP) DSP Core with a number of internal peripherals including: 2 PCM ports, a 2048 tap Filter Co-processor, 2 Auxiliary Timers and a Watchdog Timer, 9 GPIO pins, UART, Slave SPI and Master SPI ports and a master/slave timing block. 

      The firmware products and manuals available at the release of this data sheet is the ZLS38233: 4 Channel Voice Echo Cancellor (VEC) with integrated DTMF Transceiver (Tx/Rx). If these applications do not meet your requirements, please contact your local Zarlink Sales Office for the latest firmware releases.

      Features 

      100 MHz (200 MIPs) Zarlink voice processor with Butterfly hardware accelerator and breakpoint/interrupt controller
On-board Data (26 Kbytes), Instruction (24 Kbytes RAM and Boot (3 Kbytes) ROM
2048 tap Filter co-processor shared across up to 16 separate functions in 128 tap increments 
      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 
      Watchdog and 2 auxiliary timers 
      11 General Purpose Input/Output (GPIO) pins 
      General purpose UART port 
      Bootloadable for future Zarlink software upgrades 
      External oscillator or crystal/ceramic resonator 
      1.2 V Core; 3.3 V IO with 5 V-tolerant inputs 
      IEEE-1149.1 compatible JTAG port 
      Typical Applications 
      Wireless Local Loop base stations and controllers Voice telephony gateways Digital,  VoIP based and wireless PBX systems 
      Echo Canceller pools 
      Customer Premise equipment 
      Integrated access devices 
      SOHO gateways



图1. ZL38015方框图.
ZL38015数据表请见:
http://assets.zarlink.com/DS/zarlink_ZL38015_JUN_07.pdf
Building on five generations of voice echo cancellation expertise, the highly integrated
ZL38015 hardware and ZLS38233 firmware platform helps manufacturers
simplify design, speed time-to-market and lower costs of telecom equipment supporting
voice services over converging networks.
Supporting full-band echo cancellation and advanced algorithms, the ZLS38233
is a four-channel VEC with echo tail programmable up to 64 ms per channel.
The ZLS38233 firmware also integrates a range of features, including DTMF (Tx),
DTMF (Rx) and ALC (automatic level control) to support superior voice quality
and reduce bill-of-materials costs. Firmware is field-upgradeable for future product
revisions.
The ZL38015 voice processing platform is built on a voice optimized 100 MHz
(200 effective MIPS) DSP with an integrated 1024 tap filter co-processor, 16 KW
instruction and 8 KB data memory, hardware accelerators, SPI/UART/TDM interfaces,
multiprotocol TDM ports, flexible clocking scheme support and 10 GPIOs.

ZLS38233 Firmware Supporting High Quality Voice
Four-channel G.168 echo canceller with programmable echo tail length (maximum combined echo taillength of 256 ms)
PCM coding, U/A-Law ITU-T G.711 orsign magnitude Per-channel fax/modem G.164
2100 Hz or G.165 2100 Hz phase reversal tone disable
Fast reconvergence on echo path changes, fully programmable,convergence speeds
Patented advanced NLP with highquality subjective performance
G.169 ALC maintains loop gain through a programmable gain range from 0 db to –24 to 24 db
Four independent DTMF receivers (DTMF Rx)
Four independent programmable tone/DTMF generators (DTMF Tx)
ZL38015 Voice Processing Platform
100 MHz (200 MIPs) voice processor with butterfly accelerator
On-board data (26 Kbytes),instruction (24 Kbytes) RAM andBoot (3 Kbytes) ROM
2048 tap shared filter co-processorwith 128 tap increments
Flexible PCM ports support TDM protocol (ST BUS, GCI or McBSP framing or SSI modes)
10 GPIO pins
Bootloadable for future Zarlink software upgrades



图2.固件ZLS38233方框图

The ZL38015/ZLS38233 platform is a four-channel VEC with integrated DTMF transceiver designed for enterprise and residential gateway applications. Each channel of the ZL38015/ZLS38233 provides an integrated and upgradeable solution that meets
strict echo cancellation requirements, including G.168, G.164/ G.165, and G.169. The platform allows equipment manufacturers to lower BOM costs and reduce both  time-to-market and integration resources.
The rapid growth of VoIP services is driving demand for a new class of telecom equipment to ensure superior voice performance across converging networks. As illustrated below,
ZL38015/ZLS38233 VEC with integrated DTMF transceiver is well suited for converged network gateways that must deal with complex echo issues and seamlessly handle voice traffic with no discernable loss in quality for the end-user.

The ZLS38233 firmware implements Zarlink’s best-in-class VEC core competencies: a maximum of 256 ms (64 ms per channel) of G.168 compliant echo tail cancellation for converging networks, an advanced NLP improving voice quality with comfort noise injection; a G.169 ALC for effective automatic loop gain control; gain control at all ports; and fast convergence during double-talk.

The ZL38015 voice processing platform is built on a voice optimized 200 (effective MIPS) DSP with an integrated 1024 tap filter co-processor, 16 KW instruction and 8 KB data memory, hardware accelerators, SPI, UART and TDM interfaces, multiprotocol TDM ports, flexible clocking scheme support and 10 GPIOs. This platform ensures future scalability and feature improvement while providing flexibility and increased performance.



图3.VoIP网关应用方框图.

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