This textbook provides a detailed introduction to the use of software in
combination with simple and economical hardware (a sound level meter
with calibrated AC output and a digital recording system) to obtain
sophisticated measurements usually requiring expensive equipment. It
emphasizes the use of free, open source, and multiplatform software.
Many commercial acoustical measurement systems use software algorithms
as an integral component; however the methods are not disclosed. This
book enables the reader to develop useful algorithms and provides
insight into the use of digital audio editing tools to document features
in the signal. Topics covered include acoustical measurement principles,
in-depth critical study of uncertainty applied to acoustical
measurements, digital signal processing from the basics, and
metrologically-oriented spectral and statistical analysis of signals.
The student will gain a deep understanding of the use of software for
measurement purposes; the ability to implement software-based
measurement systems; familiarity with the hardware necessary to acquire
and store signals; an appreciation for the key issue of long-term
preservation of signals; and a full grasp of the often neglected issue
of uncertainty in acoustical measurements. Pedagogical features include
in-text worked-out examples, end-of-chapter problems, a glossary of
metrology terms, and extensive appendices covering statistics, proofs,
additional examples, file formats, and underlying theory.
