Inversion of Loudspeaker Dynamics and Room Acoustics
Master Thesis, Uppsala University, Report
UPTEC F 99010, Feb 1999.
Within the new undergraduate course
Adaptive Signal Processing Project course,
one of the projekt tasks which can be chosen
is to investigate ways to
compensate for the dynamics of loudspeakers,
and if possible also to invert some of the room acoustics.
This master thesis project
verified the basic ideas, hardware and software tools.
The specifications of this project are to study how a PC could be
used for compensating an audio system and what problems there
are, so that a laboratory course can be launched where the students
have to compensate for room acoustics and stereo dynamics.
The results of using the filtered-x LMS algorithm to compensate
for a stereo are presented by compensating for two different sets of
equipment. Due to the limitations of the equipment used, real time
adaptation has not been attempted and audio evaluation of the
solutions found has not been possible.
The results obtained suggest
that a fast computer and a good microphone system will allow for
good adaptive compensation of the stereo. Some further research
will be needed for successful compensation of room acoustics.
- Thesis Advisor:
- Mikael Sternad
Subsequent Master Thesis
by Mathias Johansson and Jonas Rutström.