Software settings
Setting of audio devices
In the Audio tab of the Settings window the parameters for the audio input and
output are set, as well as the audio devices for signal processing (decoding)
programs. Incorrect settings can cause delays and faulty signals.
The most important parameter is the selection of the audio driver. It may be
DirectSound or one of the ASIO drivers installed in the system.
The main difference between these two drivers is that when using the ASIO driver
minimal audio signal delays are guaranteed, but only one program can use the
selected device for sound input/output. That is, when using the ASIO driver in the
ZeusRadio all other software cannot use this audio device. And vice versa, if another
software already uses the audio device, ZeusRadio will not be able to connect to it.
When using the DirectSound audio driver a delay may be slightly higher, but it still
remains the opportunity to play audio from other software.
By default, the ZeusRadio software uses DirectSound and
primary devices for audio input and output, i.e. the devices
that are selected by default in the system as a sound
recording/reproducers. Usually, it is the speaker and the
microphone. But it is also possible to make the selection
manually, for example, to select speakers for sound output
(regardless of the system settings) and the virtual audio
cable for sound input.
When using DirectSound, an important parameter is the
Audio Buffer Duration. By default, a value of 0.2 seconds is set, which is suitable for
the majority of systems. But in systems with high efficiency it is possible to reduce
the sound delay by setting the Buffer Duration of, for example, 0.08 second. For
systems with low efficiency a reduction of the buffer duration may lead to
interruptions and pops of the audio signal.
To achieve minimum delay of the audio signal and for
operation in telegraphy mode at high speeds, it is
necessary to install and use the ASIO driver.
When selecting the ASIO driver, audio input and output
selection is done through the driver settings window,
which may look different and will be shown by clicking the
Show ASIO Control Panel button.
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