Sensicomm LLC - DSP design services.

Algorithms, software and hardware for sensors, signal processing, and communications.
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Examples of DSP algorithm, software, and hardware projects.

Projects are described here to a level of detail consistent with obligations to the client. In some cases that includes permission to release code and other documentation as open source.

FPGA/DSP projects

MHZ100Q mhz100q.sourceforge.net is an open source data acquisition project that includes a 4-channel, 100MHz A/D conversion PCB with buffer amplifiers and antialiasing filtering. It interfaces to Xilinx FPGA development boards by Digilent. The project also includes a standalone version that contains 2 A/D channels, an FPGA, and a USB interface. Firmware implemented in VHDL performs filtering and desampling to simulate lower sampling rates, and buffers blocks of data for transfer to a host PC via the USB interface.

Miscellaneous

Projects have been performed for various clients include

• Developed algorithms and hardware/software solution to correct the freuency response of a low-cost throat microphone. After correction the sound quality is comparable to a conventional microphone, but the noise rejection is much better.
• Data acquisition and digital filtering implemented in assembly/C for an Analog Devices TigerSharc processor.
• Software for speech noise reduction and bandwidth expansion.
• Demodulation of PSK, OFDM, and other modulation waveforms.

Self-funded projects (for which I can provide details) include:

• Some work on speech recognition in noise. robospeechrec. I'm using the Sphinx open source recognizer and plan to post many of my components as open source also.
• I recently completed an IEEE-sponsored course in advanced techniques for FPGA development. Some things being done for that course are described here.
• Implementaton of a Reed-Solomon encoder and decoder for the Analog Devices Blackfin processor. This software is now available under the GNU General Public License (GPL). Click here for more details.
• Implementation of an audio processing system using the Texas Instruments MSP430 processor. This unit runs on a single AA battery, is intended to perform data capture and digital filtering on an audio data stream.
• A voltage booster, to convert the output of a single NiMH or NiCd battery to 3.3 volts. Intended for the MSP430, but applicable to any 3.3 volt low power processor.
• A voice synthesizer implemented in the Cypress Programmable System-on-a-Chip (PSoC). More info: psoc.shtml
• An in-house project to implement data acquisition using an Anadigm Field Programmable Analog Array chip. projects/anadigm

Notes about installing Linux on my Acer 5253 laptop are here: linux/acer_5253/index.shtml.