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FM-531HD / May 2013
F M - 5 3 1 H D P R O G U I
After passing through the Phase Rotator the same voice appears like the waveform
below. Notice how the upper and lower portions of the waveform now have equal distri‑
bution? No information is lost and, more importantly, no harmonic or intermodulation
distortion is created by the Phase Rotator. The only thing that happens is that the signal’s
phase relationships are rearranged to make the waveform energy more uniform in polarity.
HPF – High Pass Filter
The High Pass Filter is used to remove inaudible and unnecessary subsonic energy
from the audio signal prior to it being processed. By removing this energy, processing
is cleaner and modulation energy is not wasted by transmitting sounds that will not be
perceptible to a listener.
The High Pass Filter also removes subsonic energy that could upset the operation of
equipment later in the audio chain, such as the AFC loop in the FM exciter.
The High Pass Filter has two operating modes:
Off – If the High Pass Filter box is not checked the High Pass Filter is not enabled.
Stereo – If the High Pass Filter box is checked the High Pass Filter operating mode
is stereo and both left and right audio channels are treated equally by the high pass filter
frequency.
Human voice after
Phase Rotator
algorithm
Summary of Contents for FM-531 HD
Page 2: ...Technical Manual Wheatstone Corporation May 2013 FM HD Digital Audio Processor FM 531hd...
Page 122: ...page A 2 FM 531HD May 2013 A P P E N D I C E S Appendix A General Specifications A 3 Contents...
Page 128: ...page A 8 FM 531HD May 2013 A P P E N D I C E S Appendix B FM 531HD GPI Interface A 9 Contents...
