Atec Rohde-Schwarz-UPL - Manual (Page 2)

2 Audio Analyzer UPL
Analog and digital
Audio signal processing is nowadays
no longer conceivable without the use
of digital techniques. Yet, analog tech-
nology continues to exist and under-
goes constant improvement. State-of-
the-art measuring instruments must
therefore be able to handle both ana-
log and digital signal processing.
Audio Analyzer UPL performs practi-
cally all types of analog measurement,
from frequency response measure-
ments through to externally controlled
sweeps with reference traces, determi-
nation of 3rd-order difference fre-
quency distortion, spectral display of
demodulated wow and flutter signals,
etc. In contrast to many other audio
analyzers, UPL is capable of perform-
ing real dual-channel measurements in
the audio-frequency range, ie there is
no need for switch-over between two
inputs and this type of measurement is
not limited to a few special cases.
The generator is every bit as versatile:
it supplies any conceivable signal from
sinewave and noise signals through to
multi-sinewave signals comprising up to
7400 frequencies.
In addition to all this, UPL features
excellent technical data: analog sine-
wave generation with harmonics of
typ.
− 120 dB, spectrum displays with
a noise floor below − 140 dB for ana-
log and − 160 dB for digital interfaces,
FFT with a maximum frequency resolu-
tion of 0.05 Hz, etc.
UPL provides signal monitoring via
loudspeaker, jitter measurements on
digital audio signals, resynchroniza-
tion of jittered digital audio signals by
means of a jitter-free clock signal, and
many more features.
Superior analysis concept
UPL performs all measurements using
digital signal processing. Analog sig-
nals to be tested undergo elaborate
preprocessing before they are digi-
tized and measured by means of dig-
ital routines. For example, in THD
measurements, the fundamental is
attenuated by means of a notch filter
and the residual signal amplified by
30 dB before it is digitized. In this way,
the dynamic range can be extended
Audio analysis today and tomorrow
2 Audio Analyzer UPL