ABSTRACT
Acoustical signals carry energy and information about their source, which is propagated as sound waves traveling through a physical medium in the form of gas, solid, or liquid. The information carried as acoustical waves exists in two orthogonal domains-time and frequency (Jones et al., 2000). Frequency ranges of interest acoustically can extend from a few Hz to several
CONTENTS
10.1 Introduction ............................................................................................... 213 10.2 Choice of Processing Procedures ........................................................... 214
10.2.1 Software and Hardware Chromatic Filters for Frequency-Domain Acoustic Signals ....................................... 217
10.3 Pulsatile Nature of Acoustical Signals ..................................................220 10.4 Examples of Chromatic Processing Deployments ............................... 224
10.4.1 Simulated Pulse Trains (Frequency Domain) ......................... 224 10.4.2 Industrial Plant Faults (Frequency Domain) ..........................226 10.4.3 Diesel Engine (Time Domain) ...................................................227 10.4.4 Controlled-Pulse Train (Frequency Domain) .........................229 10.4.5 Double Pulse Signals (Frequency Domain) ............................230 10.4.6 Chromatic Infrastructure of a Single Pulse
(Frequency Domain) ................................................................... 232 10.4.7 Narrow-Frequency-Band Continuous Signals
(FrequencyDomain Plus Second Generation) .........................233 10.4.8 Random Pulsatile Events (Combined Frequencyand
Time Domain) ..............................................................................233 10.5 Summary ...................................................................................................236 References ............................................................................................................236
