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AUDIO CONTROL
16.1.2
Phase rotator input
In the input stage, the processor generates a phase rotation via a ‘phase rotator’ circuit. This optimisation is achieved by
means of a dedicated filter which acts on the input signal waveform to avert unwanted effects, as in the case where
material with a highly vocal content is inputted directly into the audio processor.
The waveform of a standard speech signal (as in the case
of signals generated by microphones) is asymmetrical,
while that of a standard musical signal is symmetrical.
The sound of an asymmetrical clipped speech signal is
much less pleasant and agreeable than that of a
symmetrical clipped signal. That is why the Phase Rotator
ensures that the signal phase is converted from an
asymmetrical waveform to a symmetrical waveform,
thereby significantly improving standard spoken audio
material and, therefore, eliminating any type of distortion
during the clipping stage.
However, it is advisable to pre-process vocal material (speech), i.e. in the same way as it is captured by studio
microphones, with dedicated VOCAL processors positioned between the microphone and the mixer for the signal on air
(
see figure on the right
).
At this point, after due consideration of the type of equipment present at the station, you will be able to decide whether
the Phase Rotator needs to remain on, or if it is more useful to have it turned off.
If, however, there is no microphone processor installed between the microphone and the mixer, and the spoken material
is transmitted directly to the processor inputs, then it is useful to keep the Phase Rotator switched on and apply the effect
thereof.
There are three Phase Rotator levels available. Each of them has a different effect on spoken audio material. Without
going into the matter too deeply or providing long and cumbersome mathematical explanations, we recommend you test
the different phase rotation levels and choose the one most suitable for the material that the processor will be modifying
according to the table below. The Phase Rotator
default setting is Level-2
Phase Rotator
Level
Mode Use
OFF Off If there are already dedicated audio processors present for audio
signals from microphones or for spoken audio material.
Level-1 Female voice If the audio material processed is predominantly female.
Level-2 General Purpose This is the default setting. Suitable for general audio processor use,
i.e. with music, mixed with speech, or for background music with the
presenters’ voices over it (whether male or female), or spoken
material inputted into the audio processor.
Level-3
Male voice If the audio material processed is predominantly male.
In addition to the
Phase Rotator control, the Falcon XT (and all the processors in the Falcon series in
general) are equipped with a voice detection stage ( Speech Detector) , which can recognise vocal
components within the audio material inputted into the audio processor and automatically adjust the
processing parameters in order to obtain the best result. Please see the section on the
Speech Detector .
All the factory settings have the Speech Detector activated.
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