Carrier Setup

1.Basic

State

Choice: On | Off

Default: On

Double-click or use the drop-down menu to set the state of the carrier ON or OFF.

Frequency Offset

Range: -40 to 40 MHz

Default: 0.000000 Hz

Set the frequency offset for the carrier relative to the signal generator’s frequency setting.

Initial Phase

Range: 0.00 to 359.00 deg

Default: 0.00 deg

Set the initial phase of the carrier.

Power

Range: -50.00 to 0.00 dB

Default: 0.00 dB

Set the carrier’s power relative to the signal generator’s amplitude setting.

2.DAB

Transmission Mode

Choice: ModeI |ModeII | ModeIII | ModeIV

Default: ModeI

Set the transmission modes (i.e. I, II, III and IV), which are defined to allow the system to be used for different network configurations and a range of operating frequencies. Four transmission modes have 4 different carrier numbers: 1536, 768, 384 and 192.

Transmission mode	Duration of transmission frame	Number of FIBs per transmission frame	Number of CIFs per transmission frame
I	96 ms	12	4
II	24 ms	3	1
III	24 ms	4	1
IV	48 ms	6	2

In our Signal Studio product, FIG in the FIB (Fast Information Channel) could be configured with flexibility - pre-defined or user-defined, and more information are available on FIG Configuration.

The MSC is comprised of Common Interleaved Frames (CIFs), which contains 55 296 bits. The smallest addressable unit of the CIF is the Capacity Unit (CU), comprising 64 bits.

Therefore, the CIF contains 864 CUs, which shall be identified by the CU addresses 0 to 863.

For more information on the CIF Structure, please check CIF structure.

Number of Transmission Frames

Range: 1 to 10000

Default: 4

Set the number of transmission frames. Please be aware of that, by default when the Data Source type is Demo, the Number of Transmission Frames will automatically be set to 60, which could later be modified by users; however, when you select DAB Plus in Audio Service Component Type of the certain service component, and change the Number of Transmission Frames to a value other than 60, there might be a waveform discontinuity problem.

Filter Type

Choice: None | Ideal Lowpass | User Defined

Default: None

Set the filter type.

A low-pass filter is a filter that passes low-frequency signals but reduces the amplitude of signals, or called attenuates, with frequencies higher than the cutoff frequency. Usually an Ideal Lowpass is recommended to acquire a smooth spectrum.

Filter Coefficients

Set the filter coefficients.

This parameter is valid only when Filter Type is User Defined.