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DSP PROGRAMMING
SIGNAL PROCESSING
DIGITAL HARDWARE DESIGN ENGINEER

• DSP PROCESSORS / COMPONENTS:

  TI: TMS320C20/C25, C50/52/57, F240, LF2407, C548, VC5410, C6201
  Motorola: DSP56002, DSP56303, DSP56F805;
  ADI: ADSP2101
  Digital Filters, Correlators, Viterbi Decoders, MAC s, NCO s, etc.

• DIGITAL CIRCUIT COMPONENTS:

  Logic families: TTL, LSTTL, FAST, CMOS, HCMOS, ECL, etc.
  Memories: RAM s, ROM s, PROM s, EPROM s, FLASH, etc.
  Assorted Microprocessors, UART s, PAL s, ALU s, etc.

• ANALOG CIRCUIT COMPONENTS:

  A/D and D/A Converters, Active and Passive Filters, Analog Switches, Operational Amplifiers, Voltage Regulators, Oscillators, Comparators, Opto Isolators, LED/LCD Displays, Video Cameras, Monitors, Transistors, Rectifiers, SCR s, TRIAC s, Line Drivers/Receivers, Delta Sigma, etc.

• SOFTWARE:

  MATLAB ver-4/5 , C, DOS, Windows, Word, Excel, Coreldraw, etc.
  Assembly Language: Ass t uProcessors, Z-80, TMS320Cxxx / DSP56xxx
  DSP tools: Code Composer, Code Composer Studio, CodeWarrior P-CAD 2000 PCB layout , PROTEL Advanced Schematic ver 3.0
  Future-Net PC based schematic capture software pkg.
  PADS-PCB PC based printed circuit board layout pkg.

MSEE 1985 from University of Southern California - USC
Additional engineering courses taken in EEE program at USC
BSEE 1982 from California State University, Northridge - CSUN

Areas of interest: Communications, Digital Signal Processing DSP
Member of Tau Beta Pi, Member of IEEE
Registered Professional Engineer PE - State of California

I have had extensive experience as a hardware/software design engineer doing digital logic design and assorted signal processing programming tasks for various companies over the past several years. I have worked both as a permanent employee and, most recently, as a contract engineer both independently and through various contract houses .

My experience includes hardware and software design of dedicated high speed circuitry as well as microprocessor controlled embedded systems. In addition, I have designed both hardware and software to implement digital signal processing DSP functions including digital filtering FIR and IIR , signal modulation, demodulation, detection, analysis, synthesis, convolution, correlation, coding, etc. I am also familiar with low-frequency sub-microwave analog components / circuit design.

In addition to the above design experience, I also have strong problem solving and troubleshooting skills.

Academic coursework has included such topics as Linear System Theory, Digital Signal Processing, Communication Theory, Spectral Estimation, Error Correction Coding, etc. I am familiar with Laplace / Z / Fourier Transforms continuous and discrete time , FFT s, Digital Filtering, Sampling, Decimation, Interpolation, Multirate Signal Processing, etc.

• Continuation of signal processing software design tasks from a prior contract assignment with the same company to add new features to the companies vibration analysis equipment.
• Design work included assembly and C-code routines to implement multibank "tracking" filters these are independent, constant-Q, IIR bandpass filters with programmable center frequencies .
• Also designed multibank "broadband" filters similar but with wider passbands and programmable high and low band edges .
• Wrote code to compute RMS and average absolute value metrics from the above filter outputs.
• Implemented a large 2M word data acquisition buffer for signal analysis in the time domain.
• Added software functions for doing FFT averaging up to 128 averages for up to 128K FFT s in each of 4 independent channels .
• Averaging could be done either non-coherently FFT magnitude only or, coherently in vector form .
• Various "channel math" operations could be performed on the final averaged FFT results.

• Initially translated older 80251 assembly code files into newer C-code routines. Then developed both C and assembly code software for use in controlling a new Uninterruptable Power Supply UPS design. The code executed on a Motorola DSP56F805 DSP chip and was developed with the Metrowerks now Motorola CodeWarrior compiler tools.
• The design made extensive use of the DSP s internal peripherals PWM s, A/D s, Timers, etc. to save on external hardware.
• The design included software which implemented various closed loop control algorithms.

• Brief contract assignment to instruct one of the companies programmers on programming procedures for a LF2407 motor control DSP chip using a Spectrum Digital evaluation board.
• Developed skeleton code routines to demonstrate how to program the chip s PWM modules, Timers, Interrupt Vectors, burning internal FLASH memory, etc. for use in various designs.
• Wrote misc assembly code routines to help speed up the final code.

• Extensively debugged and documented legacy software written entirely in ADSP2101 assembly code for use in a digital receiver.
• Discovered and corrected several subtle design bugs embedded in the original assembly code to improve receiver performance.
• Provided detailed descriptions of the code s signal processing routines all previously undocumented .

• Brief contract to evaluate some existing PC based C-code software and then translate it into new C and/or assembly code routines to run on a VC5410 DSP processor.
• The application involved image compression/coding routines.
• After discovering several errors in the initial software and running some preliminary DSP test code on a VC5410 evaluation board, the company went out of business and the contract was never completed.

• Brief contract to evaluate a Spectrum "Daytona" dual C6201 DSP board for use in a GPS related project.
• Due to an internal company reorganization which resulted in their being acquired by another company, the contract was canceled.

• Translated old signal processing code originally designed to operate on the now obsolete TMS320C14 DSP processor to the newer TMS320F240 for a new line tracer pipe locator product.

• Extensively debugged and cleaned up existing DSP56002 signal processing code to vastly improve the performance of earlier company products for use in vibration analysis and rotor/prop balancing applications.
• Then, translated the entire design to run on a newer DSP56303 DSP processor.
• Added additional features to greatly enhance performance for an entirely new product line.
• Software design included both assembly as well as C code routines to implement large block floating point FFT s and various other signal processing functions such as digital decimation filtering, programmable time windowing, scaling, zooming, etc.

• Debugged a prototype TMS320C548 DSP controller board for a 100kW power protection system.
• Wrote C548 assembly code test routines.
• Designed an RS-232 interface to communicate with the DSP processor.
• Helped redesign and layout their next generation signal processor board.

• Designed assembly language DSP code algorithms for the TMS320C50 / C57 processors to implement various signal processing functions such as AGC, DTMF detection, FSK detection, FFT spectral analysis, tone detection, digital FIR/IIR bandpass, lowpass, notch filters, etc.
• Brief contract to design TMS320C50 assembly code interface routines to a PIC microcontroller as initial work for a new communications project.
• Designed digital hardware to generate test data sequences synchronized to the scan rate of a CCD camera and frame grabber board as a proof of concept for a new optical correlator design.
• Designed software to implement a realtime 20-channel multiplexed digital filter processor used to post-filter data from a bank of delta sigma A/D converters in an automotive test bed application. The routines were all written in assembly code for a TMS320C52 DSP processor.

• Taught various courses and labs in Electronics, DC Circuit Analysis, AC Circuit Analysis and Calculus.

Designed digital and analog circuits and directed digital design in Digital Systems Research Lab while working on the following projects:

• BIG VITERBI DECODER BVD : Designed digital and analog hardware to implement a programmable constraint length K max K=15 , rate 1/r r=2,3,4,5,6 Viterbi Decoder for the decoding of spacecraft data. Hardware design included both analog and digital gaussian noise sources, simulated data generators, programmable data encoders, SNR and Bit Error Rate BER estimation, Symbol Sync and Node Sync Correlation circuitry, internal self-test circuitry, etc.

• SHUTTLE IMAGING RADAR SIR-C : Designed a data demultiplexing system used to descramble information recorded on the Space Shuttle s high density data recorders, a multi-tape buffering unit used to make copies of the master tapes received from the shuttle and a high speed parallel- to-serial converter.

• GALILEO S-BAND PROJECT: Worked on contract to develop a multichannel RF 295 MHz test signal generator used to simulate the Spacecraft s transmitted S-band output signal. This was used as a test signal source for the rest of the project whose function was to maximize the return data rate from the spacecraft which was greatly diminished due to an antenna malfunction .

• MOBILE SATELLITE EXPERIMENT MSAT-X : Designed an all digital data modulator-demodulator 8-PSK modem using the TMS32020/C25 series of DSP processors. Design included a Z-80 controlled RS-232 interface to an IBM-PC for software development and downloading program code into the TMS32020/C25 processor boards. Designed both analog and digital filters to remove intersymbol interference by pulse shaping using square root, raised cosine pulse shapes the transmitted symbols.

• ADVANCED RECEIVER PROJECT: Designed electronics for an all digital receiver including an I/Q quadrature demodulator with decimation filtering and other assorted signal processing circuitry .

• SEARCH FOR EXTRATERRESTRIAL INTELLIGENCE SETI : Designed a 16 Megabyte dynamic RAM DRAM memory board for use in a 2-million point complex FFT spectrum analyzer.

• SYMBOL STREAM COMBINER SSC : Designed digital hardware to combine together symbol streams from several sources to increase the SNR of the received symbols when arraying several antennas together.

I am a very "hands-on" engineer and am at home working in a laboratory environment. I am familiar with most types of test equipment o-scopes, logic analyzers, etc. and have enjoyed designing, building, testing and troubleshooting various electronic circuits both for work and as a life long hobby.