• Design Proprietary audio algorithm and real-time simulation. ◦ Designed displacement control algorithm for speaker system. ◦ Designed Enhanced PEQ algorithm development and implementation. ◦ Designed Virtual Bass algorithm development and implementation. ◦ Developed real-time streaming model for algorithm test on OMAP-L137, L138. ◦ Implement algorithm with commercial product. (Brand name : Samsung) • Performed Dynamic Range Control simulation for problem solving. • Designed digital to analog convertor half band filter model matlab simulation. • Designed analog to digital convertor CIC decimation filter. • Designed instruction set for Application Specific Instruction Processor.

• Performed verification and simulation with Image preprocessing engine. (Samsung) • Executed performance analysis and test for DTMF and Call progress Tone generator. • Developed CID, DTMF engine using TI tms320c25 with FPGA and ASIC environment ◦ Firmware and RTL simulation for ASIC Mass production. (Brand name: Samsung) ◦ Developed DSP software and hardware verification tool chain. ◦ Firmware programing and simulation using assembly language. • Designed and developed DSP software Tool chain using C, MATLAB and PERL.

• Developed audio and speech for CDMA and WCDMA Modem chip. ◦ Reviewed ADSP2181 DSP architecture and simulation environment. ▪ Prepare simulation environment for Faraday’s FD216 DSP. ▪ Configured EVRC vocoder and GPS memory map for simultaneous running. ◦ Enhanced aacPlus codec with C level simulation and vector test. ◦ AMR-WB+ codec with C level simulation and vector test. ◦ Designed in-band droop compensation filter for sigma-delta A/D, D/A. ▪ CDMA, WCDMA, GPS, EDGE mode. ▪ Cascade frequency response simulation using MATLAB. ▪ Designed CIC filter and in-band droop compensation filter. ▪ Fixed point link simulation for SNR measurement. ◦ FR, HR, EFR, AMR vocoder for GSM terminal. ▪ Verified each vocoder with test vector. ▪ Merged EFR, AMR-NB vocoder. ◦ Implemented TTY/TDD function for EVRC ASM program on Teaklite DSP with fully automatic checking shell script environment. ▪ Programmed conformance testing tool for CYGWIN environment. ▪ Performance analysis with CER. (Character Error Rate). ▪ Automatic compare, report and generate OCTAVE code for performance measurement. ▪ Tools : C shell, PERL, gcc , OCTAVE, Teaklite DSP software. ◦ Designed a smoothing filter for Cellular phone. (Brand name : Samsung) ▪ Background noise rejection and remove discontinuous waveform. ◦ Designed G.712 filter for reject power noise and aliasing using MATLAB. ▪ Designed IIR filter and checked group delay, stability. ◦ Reviewed and debugging GPS DSP software on CEVAX-1620. ▪ ISR routine and board debugging. ◦ Field test for base band modem and audio. ▪ Analyzed noise injection test for voice and modem interoperability. ▪ Mobile originated and Mobile terminated call test. ▪ Cell boundary audio test. ◦ Designed PCM filter for CDMA phone. ▪ Implemented filter on Teaklite DSP for data path. ▪ Successfully developed on commercial cellular phone. (Brand name : LG) ◦ Ported General MIDI ,MP3, BSAC on ARM946E-S. ◦ Implemented AMR-WB on Teaklite DSP. ◦ Managed CDMA2000 EvDo Modem physical layer design team. ▪ Code coverage test for base band modem RTL. ▪ Reviewed CDMA2000 interoperability test specification. ▪ Successfully passed on Verizon wireless signaling test.

• Implemented MPEG4 BSAC audio decoder with 24-bit DSP. ( Nov’2003 ~ Mar’2004) ◦ Modified integer C model for DMB(Digital Multimedia Broadcasting) system. • Audio simulation and implementation for DVR product. (Aug’2003 ~ Oct’2003) • G.723.1 vocoder programming with Intel PXA250 processor. (May’2003 ~ July’2003) ◦ Optimized 30 ms frame boundary without FPU module. • DVR Client software with video compressing algorithm using MFC. (Feb’2003 ~ May’2003) • AAC, AMR data stream programming for real time operation on linux. (Nov’2002 ~ Feb’2003) • DMB(Digital Multimedia Broadcasting) system audio test. • Converting AMR vocoder from 16-bit DSP to 24-bit DSP. (June’2002 ~ Oct’2002) • G.723.1 vocoder programming and I/O porting with Strong ARM (SA-1110). (Mar~May’2002) ◦ Cross compilation x86 to ARM from G.723.1 fixed point C program. ◦ Embedded Linux environment. ( Package : Redhat series ) ◦ Optimized for real-time processing using C and ASM programming. • Implemented decoding Software for DVR (Digital Video Recorder) audio path from encoded MOTOROLA MC14LC5540 bit stream. (Feb’2002~Mar’2002) ◦ Modified g.723 (24 kbps,40kbps) to g.726 (16 kbps) ADPCM codec. ◦ I/O porting for DVR client software. • Converting G.723.1 vocoder from 16-bit DSP to 24-bit DSP. (Dec’2001~Jan’2002) • Implemented MPEG2 AAC decoder (ISO13818-7) with 24-bit DSP. (Sep’2001 ~ Dec’2001) ◦ 24 bit in-house DSP assembly coding. ◦ Successfully implemented in a real-time processing mode. • G.723.1 vocoder DSP implementation. ( Jul’2001 ~ Sep’2001 ) ◦ Part of Core block and I/O routine. ◦ Successfully implemented in a real-time processing mode. • AMR Vocoder assembly coding with an DSP chip for PDA terminal. (Oct’2000 ~ June’2001) • Teak-lite assembly code for an I/O routine on AMR vocoder. (June’2000 ~ Oct’2000) ◦ I/O routine program for a board test. • Implemented MPEG2 AAC decoder (ISO13818-7) with 16-bit DSP. (Oct’1999 ~ June’2000) ◦ In-house DSP assembly coding using a fixed-point c code. ◦ Successfully implemented in a real-time processing mode. ◦ Exhibited the system during the ISCAS2000 conference in Geneva. (May, 2000) • MP3 decoder (ISO11172-3) DSP implementation. (May’1999 ~ Sep’1999) ◦ In-house DSP assembly coding using a fixed-point c code. ◦ Translating in-house dsp into Motorola DSP56603 DSP assembly code. • IMT2000 Development Board Design. (Jan’1999 ~ Apr’1999) ◦ IMT2000 Test bed ARM7TDMI & OakDSP and I/O control FPGA Board design.

• IMT2000(CDMA2000) Modulator Design. (Nov’1997 ~ Nov’1998) • Digital AMPS Modem DSP Implementation. (Jun’1995 ~ Oct’1997) ◦ Designed a filter bank, channel codec, demodulator block. ◦ Modeling and simulation for extracting proper filter coefficients with Matlab. ◦ Mass production with dual-mode CDMA wireless phone. (brand name:ANYCALL) • System level verification for ASIC design. (Jan’1994 ~ Mar’1995) ◦ Developed a cell conversion program using c-shell. ◦ Real-time emulation with OSD(On screen display) processor and MPEG video circuit. • ASIC Center MVP. (1994) • KBPS Decoder ASIC ,OSD(On screen Display) Control Processor. (Aug’1992 ~ Jan’1994) • CVP(Color Video Printer) Control IC Design. (Jan’1992 ~ Jul’1992) • Advanced VCR project. (Jul’1990 ~ Dec’1991) ◦ Digital Image Modeling & Simulation. (Matlab, C) ◦ Worked at Samsung Electronics Princeton Lab in NJ.

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