SCS PTC-IIex, Manual

Page: 105 / 220

7 Audio
Chapter 7
7 Audio
The Audio-denoiser-menu ( aud:- menu) is activated with the command
AUdio
. The
command prompt takes the form
aud:
.
The following commands are available in the aud:- menu:
Bandwith
,
Center
,
CWfilter
,
DD
,
Delay
,
Help
,
Invert
,
Notch
,
Peak
,
Quit
,
Through
,
TOne
.
All other ( normal ) commands are not available in the
aud:-
menu!
Quit
or
DD
exit the
aud:-
menu.
The commands of the aud:- menu in detail:
7.1 Bandwidth
Default setting: 300
Parameter: X 30... 1000, Bandwith in Hz.
Adjusts the -6 dB bandwidth of the CW-filter continuously between 30 and 1000 Hz.
(Refer also to command
CWfilter
, chapter 7.3 ).
7.2 Center
Default setting: 1400
Parameter: X 300... 2700, center frequency of the CW-filter.
Sets the center frequency of the CW-filter continuously between 300 and 2700 Hz. (Refer
also to command
CWfilter , chapter 7.3 and the command CWTerm , chapter 6.30 ).
The
Center
command also adjusts the audio frequency of the CW-Terminal (chapter
6.30 ) of the PTC-IIex send and receive sides.
7.3 CWfilter
Activates the CW-filter, using the center frequency set by the
Center
command, and the
bandwidth set by the
Bandwidth
command.
The filter is designed as FIR with a linear phase-change, so that even with a bandwidth of
30 Hz it does not ring. The transfer function has not been designed for maximum edge
steepness, but a shape delivering a signal easily readable for the human ear, and the best
signal/noise ratio possible.
7.4 DD
Terminates the aud:- menu.
91