Digital control of the mechanical parameters of a loudspeaker using current feedback (presenteras på svenska)
Opponent: Laura Enflo
In the mid-seventies Karl Erik Ståhl developed a method to control the mechanical parameters of a loudspeaker by using an amplifier with a special output impedance. The work was presented as a master thesis at TMH, KTH. The method can be used to facilitate the design and improve the frequency
response of a loudspeaker as well as to reduce the distortion. The aim of this work has been to make an implementation of the method on a digital signal processor (DSP) whilst retaining the properties of the analog system. It was shown that the mechanical parameters could be controlled but that the system was not able to reduce the distortion. This was probably due to the delay that was introduced by the analog-to-digital and digital-to-analog converters in the present DSP system.