Switchable multi-transmitter combiner and method

Details Switchable multi-transmitter combiner and method Switchable multi-transmitter combiner and method

2007-08-07

2007-08-07

Nguyen, Simon (Department: 2618)

Telecommunications

Transmitter

C455S129000, C330S053000, C333S109000

Reexamination Certificate

active

10895079

ABSTRACT:
A transmitter-combining broadcast system and method is provided that allows IBOC-compatible broadcast with simple analog-to-IBOC upgradeability with high efficiency. At full power, a standard analog signal and an IBOC-compatible digital signal are transmitted by combining the output of a wide-band transmitter containing VHF-FM analog and in-band digital signals with the output of a second transmitter containing VHF-FM analog alone. By shifting signal phase, two analog signals can be combined with low loss, and net power waste can be reduced by at least 80%. The approach enables full IBOC upgradeability for existing analog-only systems, including reuse of existing transmitting equipment. Full IBOC compliance is supported, including during operation with reduced power. Switchover between partial and full power operating modes can be performed without full system shutdown.

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HD Radio News, Steve Fluker, “For IBOC, a Better Way to Combine”, Jul. 14, 2004, pp. 14-15.

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