65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56 820027, Fax: +359 56 836700
E-mail: [email protected] ,Web: www.devabroadcast.com
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SUBCARRIER PHASE
In the interest of maintaining optimum carrier modulation by the program signal, the 57kHz
RDS subcarrier should be in quadrature with the 19kHz stereo pilot. Both in-phase and quadrature
relationships are shown here in figures below, respectively. Note that a quadrature relationship
yields a slightly lower peak level, which allows the greatest carrier modulation by the program
audio signal.
Subcarrier in-Phase
Subcarrier in Quadrature
The SmartGen 6.0 in accordance with the UECP ver.7.05, allows adjustment of the phase shift
between the PILOT tone and RDS in the range of 0 - 359.9° with 0.1° increments. Although some
stereo generators supply a pilot-sync reference for RDS (usually a TTL-level square wave), this
reference may or may not be in exact phase with the actual stereo pilot component of the composite/
MPX signal. For this reason we recommend using the composite/MPX signal for synchronization.
In the
sidechain
mode, the SmartGen 6.0 simply bridges the output of the stereo generator and
does not load or otherwise compromise the composite/MPX signal.
Содержание SmartGen 6.0
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