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标 题: ADI 诚聘 codec 优化工程师
发信站: 水木社区 (Tue Oct 31 17:49:56 2006), 站内
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:
gc.hr@
Summary:
Software (DSP) Developer for the uClinux Team. Ability to port applications and integrate with prototype hardware for ADI processors and converters and develop board support packages (BSP) using open source (GNU/uCLinux) tool chain environment for VoIP. The candidate must have excellent C/C++ and assembly coding skills, experience in and strong knowledge of media protocols (RTP, sRTP, SDP, 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 networking protocols including DHCP, DNS, FTP, NAT, PPP, PPPoE, RIP, SNMP, SNTP and others. Strong knowledge of call control protocols is desired - SIP in particular.
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 metrics and QOS.
· able to write a highly optimized code making use of the parallel instructions,
· have a thorough understanding of digital signal processing algorithms, such as adaptive filters, automatic gain control, VoIP , SPI, SSI, ESAI, I2C, noise Cancellation/reduction, spectral subtraction, sub banding, LMS, RLS, FFT, FIR, IIR etc.
· demonstrated knowledge of fixed point formats and constraints
· Good understanding of signaling and transport protocols in wireless networks that provide VOIP service.
· Build BSPs using uCLinux and GNU/Linux development environments. Implementation 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 embedded 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 or VoIP.
· C/C++ and assembly coding skills
· hands-on DSP software development experience in a commercially deployed product.
· good understanding of current wireline, wireless and VoIP codecs
· a good understanding of voice enhancement algorithms such as echo cancellation, 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 & development 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, implementation, debugging and developer testing
· Bachelors in EE or CS
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36m※ 来源:·水木社区
ne***net[点击查看]·[FROM: 137.71.23.*]