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AM-10HD / Aug 2008
A M - 1 0 H D G U I
Analog Gain
The Analog audio input gain can be adjusted by clicking on the knob and drag‑
ging the mouse to the right or left. The Analog Gain level can be adjusted over a
+12dB/‑36dB range.
AES Gain
The Digital audio input gain can be adjusted by clicking on the knob and dragging
the mouse to the right or left. AES Gain can be adjusted over a +12dB/‑36dB range.
Balance
Static level errors in Left/Right channel balance can be corrected by using the
“Balance” knob. The Left/Right balance can be adjusted over a +/‑12dB range.
The control is common to both the analog and AES digital inputs.
Phase Rotator
Human voice is asymmetrical in nature, which means that it is usually “peakier”
in one polarity than the other. The Phase Rotator algorithm fixes these asymmetrical
peaks by phase shifting the signal harmonics relative to their fundamentals. This
reduces the peak to average ratio and enables an increase in apparent loudness with
minimal audible detriment. Processing the audio is greatly simplified if the waveforms
are symmetrical.
Ordinarily, human voice looks like the waveform below. Notice how the width
and amplitude of the upper and lower signal peaks are different? This is asymmetry,
and makes the processing of voice waveforms more difficult.
After passing through the AM‑10HD Phase Rotator the same voice appears like
the waveform below. Notice how the upper and lower portions of the waveform now
have equal distribution?
No information is lost and no harmonic or intermodulation distortion is created by
the Phase Rotator process. Only the signal’s harmonic phase relationships are rear‑
ranged to make the waveform energy more uniform in polarity.
Human voice before “Phase Rotator” algorithm
Human voice after “Phase Rotator” algorithm
