Patent ID: 7369624
Filing Date: 2008-05-06
Classification: H03D

Abstract:
1. Apparatus for modulating a carrier with an information signal, comprising: a plurality of serially coupled modulators, each including a carrier input, a modulating signal input and a modulated carrier output, a carrier being coupled to the carrier input of a first of the serially coupled modulators and the modulated carrier output of each modulator being coupled to the carrier input of a succeeding modulator; and an encoder responsive to the information signal for generating modulating signals to be applied to the modulating signal inputs of the serially coupled modulators, such that a product of the modulating signals forms the information signal, wherein, the modulating signals applied to each modulator of the serially coupled modulators modify the modulated carrier output received at the carrier input of the respective modulator to produce a carrier suppressed information signal modulated output at the last of the serially coupled modulators.