Projects

This page lists the projects I was involved in during my stay at Hughes Software Systems. For my course projects click here.

Personal Multimedia Appliance
    Description: PMA is a Video Conferencing solution over SpaceWay, a next generation satellite system by Hughes Network Systems. I was involved in

• Video Mixing and Video Stiching for H.263 and H.264
• Video Transcoding (to and from H.264)
• Audio Mixing for G.722

GSM-AMR Firmware for TI TMS320C62x, HSS
    Description: GSM-AMR is the adaptive multi-rate vocoder for GSM. I was involved in the firmaware development of the codec for TI TMS320C62x platform

• 'C' optimization to minimize MIPS and memory requirement using C-refining techniques like word-wide optimization and loop-unrolling.
• Writing hand assembly code employing optimal scheduling and pipelining techniques.

Voice Codec Performance Analysis (VCPA), HSS.
    Description: VCPA is a testbed for performance analysis of coice codecs. It compares the performance on basis of various attributes of a vocoder - error handling, packet concealment techniques, computational complexity, and most importantly the speech quality. For comparison of speech quality the ITU-T P.862 standard for objective comparison was used. The work involved

• Understanding Speech Coding and familiarize with various coding standards like G.729, G.726, GSM-FR, GSM-EFR, LPC10 and MELP.
• Understanding Psycho-Acoustic-Domain Objective Speech Quality (OSQ) measures like P.862, EMBSD and MNB and evaluating their relative performance in different scenarios.
• Designing a VCPA system to evaluate performance of various speech coding standards.
• Identifying test-cases on which the codec performance can be based and implementing them in C.
• Evaluate performance of G.729, G.726, GSM-FR and GSM-EFR in the test-scenarios identified above.

OASIS Project, June 2001, Hughes Software Systems (HSS).
    Title: FSK based Caller-ID system
    Description: The work involved:

• Understanding modem design principles and implementing V.23 modem.
• Designing FSK Based Caller-ID system.
• Implementing (in C) the Transmitter part of the system and porting it on to TMS320C5410 platform.
• Understanding Software Development Life Cycle (SDLC) and other Quality Processes.

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