Narrow Bandwidth Tracking Filter.
Abstract
A narrow-bandwidth (plus or minus 5 Hz) tracking filter was designed and constructed to be used as an interface stage between the output of an electro-mechanical transducer and an automatic impedance computer. The system has two channels, one of which is used to filter voltages proportional to the force measured by the transducer and the second channel is used to filter voltages proportional to the velocity of the mechanical system as measured by the transducer, as the frequency of the excitation signal is varied from 10 Hz to 10 KHz. A filter is necessary to extract the signal which may be distorted by noise and system nonlinearities. The two-channel filter uses digital circuit techniques for simplicity, stability and reliability, yet it has a linear 80 db dynamic range for impedance measurements. The usefulness of the system is not limited to mechanical impedance measurements only. The system may be used to obtain acoustic and electrical impedance and frequency response of other devices as well. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 10, 1971
- Accession Number
- AD0732206
Entities
People
- E. L. Hixson
- Inder Singh
Organizations
- University of Texas at Austin