2-2
Decoder circuitry can be readily incorporated into set-top decoder hardware, or
integrated directly into consumer receiver equipment.
2.3 Satellite / Terrestrial Radio Communications
With suitable digital modulation equipment, the Model DP503 can be used for
various satellite broadcast/distribution applications including subcarrier, band-
edge, and SCPC schemes. It can also provide the basis for a spectrum-efficient
terrestrial radio system (e.g., STL, backhaul, or inter-city relay), either as an audio
link or as part of a combined video/audio link. For these applications, a digital
modem that can accept an RS-449/422 data connection is required. The DP503 can
be used successfully with the BPSK or QPSK digital modulation techniques typical
in the satellite industry, and with any degree of forward error correction (FEC)
desired. Given the variety of available data rates, users are free to determine the
tradeoffs between audio quality, bandwidth, cost, spectrum-efficiency, power, and
robustness in determining their transmission parameters.
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