1. Joe Blubaugh Diana Mui David Sutherland Matthew Swallow
.das Autotünr.
Joe Blubaugh
Diana Mui
David Sutherland
Matthew Swallow

2. Fundamental Features
Analyzes the frequencies of an incoming sound data using a discrete Fourier transform (DFT).
Tunes six strings concurrently to predefined tuning settings.
User interface to traverse through settings with LEDs to indicate tuning status.
Records incoming sound data as a MIDI file.

3. Parallel Patented Products
Automatic string instrument tuner
Patent No. 5,767,429
System and method for automatically detecting a set of fundamental frequencies simultaneously present in an audio signal
Patent No. 6,140,568
Tuning apparatus for stringed instruments
Patent No. 4,889,029

4. Automatic string instrument tuner
Substantial Similarities
Uses a microphone as a signal pickup device.
Adjusts the tension of a string using a electrically controlled motor
Detects a sound signal and compares it to a reference value associated with a desired frequency.
User-defineable tuning setting.
Distinct Difference
Frequency analysis is done
through a signal conditioner
that uses the harmonic
signals rather than peak
detection.

5. System and Method for … Substantial Similarities
Identifies one or more fundamental frequencies simultaneously present in a signal.
Decomposes the signal into reference frequencies using peak detection.
Represents detected fundamental frequencies as well as durations and amplitudes as MIDI data.
Distinct Difference
The reference frequencies are stored and utilized as a sine wave table rather than as a table of frequency values.

6. Tuning apparatus for stringed…
Substantial Similarities
Uses a motor to tighten/loosen a peg determined by comparing the fundamental frequency of a string to a table of relative frequencies.
Has a visual indicator to show tuning status.
User-defineable tuning settings for strings.
Distinct Differences
Only tunes one string at a time
Signal is converted to a
square wave of the signal
frequency for analysis

7. Is It Infringement? “Yes” argument
Portions of the product is literally the same as described in the patents.
The same task is performed in substantially the same way.
“No” argument
There are differences between our product and the device in main functional aspects.