Improvement Of Loudspeaker Performance Through The Use Of Feedback
Abstract
This paper compares two methods of measuring the motion of a loudspeaker cone. An accelerometer device was built by designing and attaching a preamplifier to the piezoelectric crystal transducer assembly. This crystal has a voltage output proportional to the acceleration of the loudspeaker cone. The other technique consisted of measuring the back emf across the voice coil by using a bridge network. The voltage obtained is proportional to the velocity of the loudspeaker cone. Measurements indicate that for a sinusoidal input the velocity and acceleration voltages have a 90° phase shift. Thus, both methods of measurement are in agreement with theory. Feedback will also reduce the harmonic distortion caused by a nonlinear suspension system. Also, a mathematical analysis is made to determine tile effects of acceleration, velocity, and displacement feedback on the frequency of the system.
Description
Program year: 1977/1978Digitized from print original stored in HDR
Subject
loudspeaker coneacceleration
bridge network
voltage
velocity
harmonic distortion
displacement feedback
frequency
Citation
Machos, Richard B. (1978). Improvement Of Loudspeaker Performance Through The Use Of Feedback. University Undergraduate Fellow. Available electronically from https : / /hdl .handle .net /1969 .1 /CAPSTONE -PasM _1982.