3-28 Operation
When the BS.1770 Safety Limiter is ON, this calibration is correct regardless of the setting of the Digital Output
100% Peak Level control.
HD BANDWIDTH sets the audio bandwidth of the HD output from 15 to 20 kHz in 1 kHz steps.
The user should carefully test the codec in use to ascertain if lowering the bandwidth to 15 kHz improves
subjective quality. This can occur because the codec then uses all of its bits to encode information in the most
subjectively important part of the ear’s bandwidth.
If the codec employs Spectral Band Replication® technology (as does the HD Codec), then you can set the
bandwidth at 20 kHz without quality penalty, although the difference between 15 and 20 kHz is unlikely to be
audible following the encode / decode cycle.
ST./MONO (“HD Output Stereo / Mono Mode”) determines if the digital-channel output will be fed by the normal
stereo output of the HD processing chain or by a mono feed from the HD processing chain’s left channel, right
channel, or sum of left and right channels. In all cases, the signal appears on both the left and right channels of the
analog and digital outputs.
DIVERSITY DELAY TRIM allows you to trim the analog FM delay in intervals of one sample of 64 kHz (15.6 µs) so
that the delays of the analog-FM and digital radio channels are matched at the receiver’s crossfade point. This
prevents audible comb filtering during crossfades. The setting of this control is critical to get best results and you
should adjust it to one-sample accuracy.
In the HTML5 application, drag the slider of the control with the mouse to set the delay coarsely, use the Page Up
and Page Down keys for intermediate increments, and use the mouse wheel to fine-tune the delay in one-sample
adjustment increments.
Maximum available delay is approximately 16 seconds.
See the documentation provided with your HD Radio exciter for more information on setting the delay correctly.
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