Patent ID: 8355460

Claim:
A radio transmitter system arranged to be responsive to a binary signal and arranged for driving a narrow bandwidth electromagnetic wave antenna system, the transmitter system comprising: a generator adapted to be responsive to the binary signal for deriving a first output signal having frequency coded values dependent upon the values of binary bits of the binary signal, the frequency coded values representing the wave shape of the instantaneous amplitude of a first wave indicative of the values of binary bits of the binary signal; an arbitrary impulse response signal processor arrangement arranged to be responsive to the first output signal and having an output for deriving a second output signal having components representing the shape of a modulating wave having a variable amplitude envelope and the frequencies of the frequency coded values; a source for deriving another output having values in accordance with amplitude values of a carrier frequency; a transmitter connected to be responsive to the second output signal and the another output and having an output for deriving a third output signal having modulation with a shape that is a substantial replica of the represented shape of the modulating wave, the third output signal of the transmitter being adapted to be supplied to the antenna system; components of the antenna system and components between the output of the arbitrary impulse response signal processor arrangement and the antenna system and the bit rate of the binary signal being such that they cause the signal emitted by the antenna system to include modulation having a shape that differs substantially from the shape of the first wave, but for the arbitrary impulse response signal processor arrangement; the arbitrary impulse response signal processor arrangement being arranged so the signal emitted by the antenna system includes modulation having a shape that is substantially the same as the shape of the first wave.