Research Summary (What I Do and Why It

1
Research Summary(What I Do and Why Its
Important)

• DMS Lab Meeting
• Todd Massengill

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A Tale of Two Projects

• Auditory Recognition
• Comparison of Analog and Digital processing
• Motivated by requirement for portable real-time
  sound recognition
• (NSF grant)

• AUV Obstacle Avoidance
• Optical and Acoustic obstacle avoidance
• Define signals and a common processing technique
• Requires low power and functionality
• (USTLab, OR Navy grant)

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How It All BeganAuditory Recognition

• Built a tunable discrete bank of bandpass filters
• Compared this with similar digital spectrum
  calculation (not filtering)
• Compared also with an analog VLSI filter bank
  (Paul Hasler, GA Tech)

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Results Comparing Digital and Analog

• Speaker and Context Independent Phoneme
  Recognition

Digital Discrete Analog Analog VLSI
42.22
58.33
39.72
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The Next StepAnalog VLSI Processing

• Ideally, each step in the recognition will move
  to Analog VLSI
• Preprocessing (filtering)
• Cepstrum (multiply, DCT)
• Hidden Markov Model

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How It EndsObstacle Avoidance

• Project goal
• Design low-power, dual-use signal processing for
  optical (image) and acoustic (sonar) data
• Create a custom imaging chip (photodiode IC)
• Work with USTLab to define the sonar signal
• Create a custom image processing chip
• Program a PIC microcontroller

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Current StatusSmoothing Chip (20x20)

• Fabricated with MOSIS 1.8?m process
• Tested using LabView
• Smoothing demonstrated in one dimension
• On-chip decoder needs to be re-designed for
  smoothing in two dimensions

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Current StatusImaging Chip (32x32)

• Fabricated with MOSIS 1.8?m process
• In Testing using LabView
• Need to find proper bias voltages and integration
  times
• Characterize response to varying light levels
• Verify coupling between imaging chip outputs and
  smoothing chip inputs

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Design Iteration and Demonstration

• Design Iteration
• Applied for grant from MOSIS for fabrication of
  smoothing and imaging chips on 0.5?m process
  (Jan. 22/28 2001)
• Demonstrate Imaging chip in a pool, capturing
  images of the USTLab AUV
• Demonstrate Smoothing chip with revised decoder
  and increased resolution (32x32)

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Acknowlegements

• Auditory Research
• NSF Award ECS-9907464
• Collaboration with Paul Hasler (GA Tech)
• AUV Obstacle Avoidance
• USTLab
• Academic Advisor
• Denise Wilson