Cascaded digital broadcast transmitter
AssigneeRCA Corporation
InventorCharles F. Smollin
Life of this patent
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Abstract
A digital AM broadcast transmitter features a plurality of stages that are controlled by a digital signal representing an audio modulating signal. At least some of the stages are cascade coupled together using transformers. This reduces the need for high turns ratios and allows most or all transformers to be identical.
Claims6
An apparatus for generating an amplitude modulated signal from a weighted digital signal, said apparatus comprising generating means for generating a plurality of equal amplitude signals in accordance with said digital signal, and combining means for combining at least some of said plurality of signals to form said amplitude modulated signal, said combining means comprising a plurality of cascade coupled transformers having the primary of one transformer coupled to the secondary of another transformer, at least some of said transformers having a turns ratio in accordance with said weighting of said digital signal.
Dependencies are inferred from the claim text.