SCS PTC-IIex, Manual

Page: 106 / 220

7 Audio
7.5 Delay
Default setting: 100
Parameter: X 0... 1500, delay in ms.
Defines the delay time between the Audio-IN (socket X4, PIN 4) and Audio-OUT (socket
X4, PIN 1) signal.
7.6 Help
Lists all commands used in the
aud:-
menu.
7.7 Invert
Default setting: 3000
Parameter: X 3000... 4500, inversion frequency in Hz.
Activates the Audio-inverter to change LSB to USB and USB to LSB. The inversion
frequency is normally set to 3000 Hz. An optional argument allows adjustment of the
inversion frequency between 3000 and 4500 Hz..
Audio-inverter with an inversion frequency of 3600 Hz
aud:
Invert
3600 <Return>
7.8 Notch
Activates the automatic N-times notch filter. All systematic signals are heavily
attenuated. The algorithm used leads to considerably less signal distortion of speech
signals compared to simpler DSP notch filters.
7.9 Peak
Activates the automatic N-times peak filter. This may be considered as a phase-linear
Auto-Correction filter, of a very high order and large dynamic range. This filter enables
slow CW-signals within the SSB bandwidth to be found that lie
below the level
discernible by the human ear. The filter algorithm puts a very narrow band filter on all
systematic signal components. Uncorrelated noise is heavily attenuated.
7.10 Quit
Terminates the aud:- menu.
7.11 Through
Loops through the Audio signal direct, i.e. without filtering, from the input (ADC) to the
output (DAC).
92