Acoustic Timbre Enhancement of Guitar Pickup Signal with Digital Filters
The objective of this thesis was to study and develop ways to digitally enhance the timbre of guitar pickup signals. The basis for this work was natural sounding reinforcement of an undersaddle pickup signal. A problem typically encountered in a live performance situation is that the microphones often used in acoustic guitars do not capture the effect of the hollow body of the acoustic guitar. As a consequence, the audible timbre of the microphone output sounds unnatural, compared to the air-radiated sound. A solution to this problem is to use a properly designed digital filter. A proper digital filter is able to synthesize the effect of a hollow guitar body to the undersaddle pickup signal. First, this thesis discusses the behaviour of the acoustic and electric guitar, and microphones typically used in them. Based on this, the signal paths of the system are...