Belar FMHD-1, Руководство оператора

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FMHD-1 Operator’s Manual
Page 16 FMHD-1
Service Mode
This is the Primary Service Mode of the Hybrid or Extended Hybrid digital IBOC signal. The
alternatives, MP1, MP2, MP3, MP11, MP5, and MP6 indicate which carriers are present in the IBOC
digital sidebands.
CD/N0
This is carrier-to-noise ratio. “CD” is the total power in both digital sidebands; “N0” (more properly N
0
)
is the power-spectral-density measured in a 1-Hz bandwidth. Readings are typically in the neighborhood
of 70 dB under good receiving conditions.
QI
This is a numerical quality assessment of the currently selected audio program signal, on a scale of 0 to
15. Fifteen represents the best assessed quality.
DAAI
The digital audio availability indicator is a filtered, or smoothed, metric for program quality, also scaled
from 0 to 15. Fifteen represents the best assessed quality. It is specific to the chosen program stream.
MPA CODEC Mode
This is the designation of the codec configuration for the selected audio program.
Acq. Time Data
This is the measured time delay (in milliseconds) between acquisition of synchronization with the IBOC
digital carriers and the receipt of the first valid cyclic redundancy check in a Station Information Service
data frame.
Acq. Time Audio
This is the measured time delay (in milliseconds) between acquisition of synchronization with the IBOC
digital carriers and the first recovery of an audio signal.
5.2 SIS Data Screen
This display presents information about the “Station Information Service” data transport stream, as well
as some of the data it provides to FM IBOC HD receivers. The upper half presents data concerning the
data stream itself. The data for the upper half of the display are listed below, in top-to-bottom order in the
first column, then in the second.
Port ID
This is the port used in the data transport to deliver a particular service stream. Data port “
5
” is the data
port for SIS processing.
Service ID
This is the service identifier of the basic SIS data. It is “
28
”.
Session Type
This is the session type for basic SIS data. It is “
00
”.
Num Types
This is the number of basic SIS data types the IBOC decoder module is able to send to the host controller.