Feedback Control in an Actuated Acoustic Guitar using Frequency Shifting

Companion page to the JAES paper

Aalto University - School of Electrical Engineering

First four chords of main chord progression from "Where is my Mind"[1] as recorded from a dynamic microphone on axis 20 cm away from the guitar's sound hole.

Baseline, loop gain = -3dB	.wav
Baseline, loop gain = 0 dB (unstable)	.wav
With an upwards frequency shift of 3 Hz, loop gain = 0 dB	.wav
With an upwards frequency shift of 3 Hz, loop gain = 3 dB	.wav

[1] Charles Thompson. Where is my mind? [Recorded by The Pixies], 1988. On Surfer Rosa [CD], Elektra, 2003.