This thesis describes the design, implementation and testing of an analog signal conditioner for use in processing of speech signals. The signal conditioner provides gain and bandwidth control for the speech signal and also indicates the signal level. It is designed to be used in conjunction with a digital speech processor and has ports for a microphone or other signal source, an input signal monitoring device such as an oscilloscope, and interfaces to the digital speech processor. Signal bandwidth control is provided by a variable cutoff frequency lowpass switched capacitor filter, which is driven by a clock. In this thesis, the speech signal is examined and is related to the problem at hand. An overall description of the signal conditioner is then presented, emphasizing each of the signal conditioner is then presented, emphasizing each of the individual building blocks in the system. A description of switched capacitor filter theory and application follows, and signal conditioner system test results and conclusions are given. It was found that the system performance satisfied the desired specifications that were laid out when the system was first conceived.
Master of Science (M.S.)
College of Engineering
Length of Campus-only Access
Masters Thesis (Open Access)
Weir, Daniel K., "A Signal Conditioner for Speech Processing" (1986). Retrospective Theses and Dissertations. 4971.