Chapter 5
Test and Measurement Functions
CX300 Receive Functions
Rev. 001
CX300 ComXpert Operation Manual
22130634
5 - 26
February, 2022
Psophometric
Filter
Psophometric filters are typically used when measuring the
residual noise in audio equipment. The Psophometric filter is
included in the signal path to emphasize the audible parts of the
signal and attenuate signal components that contribute less to
perception of loudness.
CCITT and C-message (C-MSG) weighting filters are bandpass
filters used to measure audio-frequency noise on telephone
circuits.
None
No filter is included in the signal path.
C-MSG Filter
The C-MSG is used for voice, audio, and telecommunication
applications in the U.S.
CCITT
The CCITT (ITU-T) filter is used for international telephone
circuits.
High Pass Filter
A high-pass filter (HPF) passes signals with a frequency higher
than a selected cutoff frequency.
Not applicable to Psophometric filter type.
Low Pass Filter
A low-pass filter (LPF) passes signals with a frequency lower
than a selected cutoff frequency.
Not applicable to Psophometric filter type.
Audio 1
Impedance
Selects the input impedance of the
Audio In
connector to a
value that matches the output impedance of the audio source.
Table 5-11 Audio In Controls and Settings (Continued)
Parameter
Description
