ADI 上海 诚聘 Codec优化工程师

发布时间：2006-11-02
工作地点：上海
信息来源：日月光华
职位类型：全职
职位描述
发信人: mulan (id外借中), 信区: Job 标 题: ADI 上海 诚聘 Codec优化工程师 发信站: 日月光华 (2006年11月02日11:06:25 星期四) Title: Codec Optimization Engineer Company: Analog Devices Inc. (Shanghai Rep.) ww***com[点击查看]bl***org[点击查看] Working address: 22F, 222 Hubin street, Shanghai, 200021, China Application Email: To: gc.hr@ Cc: aubrey.li@ Summary: Software (DSP) Developer for the uClinux Team. Ability to port applications an d integrate with prototype hardware for ADI processors and converters and deve lop board support packages (BSP) using open source (GNU/uCLinux) tool chain en vironment for VoIP. The candidate must have excellent C/C++ and assembly codin g skills, experience in and strong knowledge of media protocols (RTP, sRTP, SD P, RTCP, sRTCP, TLS/SSL, QOS, SIP), media mixing, and encoding methods (e.g. G .711, G.729). Must understand end-to-end transport issues for various networki ng protocols including DHCP, DNS, FTP, NAT, PPP, PPPoE, RIP, SNMP, SNTP and ot hers. Strong knowledge of call control protocols is desired - SIP in particula r. Required Skills: · Experience porting vocoders, on wireless as well as wireline networks, e.g. AMR, G.726, G.729, G.723.1 etc. · Thorough understanding of the vocoder algorithms, their voice quality metri cs and QOS. · able to write a highly optimized code making use of the parallel instructio ns, · have a thorough understanding of digital signal processing algorithms, such as adaptive filters, automatic gain control, VoIP , SPI, SSI, ESAI, I2C, nois e Cancellation/reduction, spectral subtraction, sub banding, LMS, RLS, FFT, FI R, IIR etc. · demonstrated knowledge of fixed point formats and constraints · Good understanding of signaling and transport protocols in wireless network s that provide VOIP service. · Build BSPs using uCLinux and GNU/Linux development environments. Implementa tion is done in fixed point C and assembly code, and further hand optimization is required for efficient use of memory and processing power · Experience in writing and automating test scripts for regressions · Ability to read schematics and hardware specifications as they relate to em bedded DSP. · The candidate will resolve the issues in real voice network to guarantee a successful deployment · 3-5 years experience with digital signal processing and speech processing o r VoIP. · C/C++ and assembly coding skills · hands-on DSP software development experience in a commercially deployed pro duct. · good understanding of current wireline, wireless and VoIP codecs · a good understanding of voice enhancement algorithms such as echo cancellat ion, noise suppression and gain control · Experience developing and deploying products using gcc/Linux · Experience in voice over packet system equipment company will be an asset · Solid technical skills / knowledge to drive solutions prototyping & develop ment across a wide range of technically diverse groups · Proficiency in IP network architecture and IP network routing protocols · Full cycle of software development including detailed analysis, design, imp lementation, debugging and developer testing · Bachelors in EE or CS