Embedded systemsSoftware Defined RadiosEngine ControllersCommunications

Design and implementation of software for Nervve's Visual Search Solution.Implement Software for image file conversion.Full stack development for a desktop Image search application.

We are creating the next generation of 3D images from the last generation of imaging technology. We have the capability to take ordinary x-rays and create three dimensional images that rival the 3D images created by expensive CT systems. Doctors love the 3D from CT scans but because our system uses existing x-ray equipment and existing x-ray pictures (radiographs), we can generate these 3D images for a fraction of the cost and with no need to purchase any additional capital equipment.Responsibilities: - Development of SW product to analyze Dental Radiographs. - Responsible for requirement writing, product design, task estimation, software implementation and test.- Software design and implementation including - User Interface using FLTK/VTK - Database management using SQLite - Image processing algorithms- Developed processes for SW development - Source management with Perforce - Automatic build environments - Source code review - Defect tracking with Bugzilla

Embedded software developmentQNX operating system

Application development with Dialogic Host Media Processing (HMP) including VoIP and some Video.Developed embedded SW for VoIP Media Gateway product line. As lead developer for audio/media processing responsibilities included, system design, task estimation, software implementation and unit test. Provide development support for SIP and SDP processing including codec negotiations. Host to Media interfaces included Telogy, Mindspeed, HMP, CAPI.Lead investigator for customer issues involving audio and other media over VoIP and TDM: determined root causes such as echo cancellation, AGC, VAD, Jitter, other Network and TDM issues.Worked with customers and DSP vendor to resolve DSP related issues. Worked with DSP vendors to implement new features including V.34 FAX over T.38.Developed and presented several training sessions for customer support and sales.Developed processes for SW Development, including source management with ClearCase, build environments for embedded systems, and peer review of source code.

Designed the LearnTone application for the IP Gateway products that allows the Gateway to automatically learn new call progress tones.Designed and implemented a PBX connectivity test application for the IP Gateway products allowing the Gateway to test its connections to the PBX including transfers and MWI. Served as the main contact with DSP vendor during implementation of requested new DSP features, including enhanced voice and tone detections.Worked with a team to successfully port and expand a voice mail application from the InSkins voice mail products to Mitel’s IPBX platforms. New features included Unified Messaging Interface, Visual Voice Mail, voice mail networking, and adding several new languages for prompts.Developed and taught a training program on DTMF detection.

Voice Technologies Group hired me to implement the DSP subsystem for their embedded voicemail systems. My tasks include the selection of the DSP and overseeing the hardware design. The DSP chosen was Analog Device’s 2181 fix point DSP. Software responsibilities included writing all the code that ran on the DSP, along with the host to DSP interface code. DSP Algorithms written included propriety ADPCM encode/decode, tone/DTMF detection and generation, echo cancellation, caller ID, others. Most of the DSP algorithms were modeled in MATLAB then written in C. During profiling, critical routines were ported to assembly for efficiency. This DSP subsystem was successfully used in three generations of the voicemail, plus variations were ported to other products. The success of the voicemail demonstrates my ability to write, maintain, and enhance reliable embedded DSP code.Worked as lead DSP engineer on a product team interfacing to a Motorola DSP subsystem to implement a 56K modem using Motorola supplied DSP code. Addition DSP code for non modem telephony tasks, including voice record and playback, was implemented.Developed methods to test and verify voice and data paths, which led to patent “6,631,339 - Data Path Evaluation System and Method”. This method allowed for quick analysis and isolation of data path errors.Worked with a team to develop an automated telephony interface detection system. This work led to patent “7,197,137 B1 – Interface Class Discovery Method and Device”

Developed DSP based solutions for the company telecommunication needs. This included a 1200 bps modem, DTMF generation and detection, and ADPCM speech processing. After evaluating the company’s needs built a demonstration board based on the TNS32OCI7 DSP processor from TI.Using a structure approach to software design based on the CADRE Teamwork CASE tool, developed code for 1200 bps modem and DTMF generation and detection. Demonstrated the code for the modem and DTMF for management.

Designed and implemented several DSP hardware designs on a large array processing system. My responsibilities included the development and implementation of subsystems that performed Analog to Digital Conversion, digital IF demodulation, channel matching, and pulse compression. Since this was the first time digital IF demodulation and channel matching were attempted on such a system, I was responsible for investigating the theory and developing the implementation. Assembled and programmed a dual channel receiver testbed to collect and analyze data for channel matching techniques to be used. The testbed consisted of analog and digital hardware controlled by a PC. The testbed was used successfully to collect and analyze data in several field tests. Results for these field tests contributed to the design of the resulting channel matching subsystem.Simulated hardware using MATLAB and C and analyzed the fixed precision effects of the implemented system.Designed an arbitrary wave form generator to generate system and test waveforms used with in the system.

As a DSP engineer designed an implemented a Continuous Variable Slope Delta Modulation algorithm and other DSP routines such as FFT on an TMS320C10 development boardDesigned a TMS320C10 board for the PC-AT bus.As a test developer designed interfaces to an Analog Circuit Tester and a Genrad board level tester for production testing of digital and analog boards.

Work in the Manufacturing Test Group developing tests for large printed circuit boards.Developed Thermal Image analyzer for locating shorts in finished printed circuit boards. This included a synthesized voice output system.Developed system for finding opens in large traces using Time Domain Reflectometry.