Optimizing the exponential sine sweep (ESS) signal for in situ measurements on noise barriers
Invited paper
University of Bologna
Monday 1 june, 2015, 12:20 - 12:40
0.2 Berlin (90)
Abstract:
The measurement of sound reflection and airborne sound insulation of noise
barriers in based on the acquisition of impulse responses by means of digital
devices. The most widely used methods employ MLS (Maximum Length Sequence) or
ESS (Exponential Sine Sweep) as test signals. The theory behind MLS generation
and use is well developed and does not involve computational problems. That is
why in CEN/TS 1793-5:2003 an MLS signal is recommended. During the European
project QUIESST also an ESS signal was applied. The ESS signal has some
advantages over MLS, such as a better signal to noise ratio (SNR) and a robust
non-linearity rejection. Anyway, the generation of an ESS signal and the
subsequent analysis of impulse responses involve some problems whose solutions
are not yet common practice. These solutions are discussed here and practical
application examples are presented.