H - Electricity – 03 – C
Patent
H - Electricity
03
C
332/68
H03C 1/60 (2006.01)
Patent
CA 1244895
13/85 ABSTRACT Single-sideband modulation method, single-sideband modulator and broadcast transmitter Broadcast transmitters with single-sideband modulation make it possible to transmit a message with a band width and carrier power which is lower in comparison with double-sideband modulation. To be able to operate a high-power single-sideband transmitter with only one transmitting tube, a single-sideband modulator (1) is used which generates, as a function on a modulating LF signal (2), a zero-phase modulator amplitude signal (9) which amplitude-modulates the anode (23) of an RF output stage tube (26) via a digital/analog converter (21), constructed as a switching amplifier with pulse step modulation, and an RF filter (22). The single-sideband modulator (1) also supplies a modulator phase signal (19) which is preferably not amplitude-dependent and which is fed to the control grid of the RF output stage tube (20), if necessary via a frequency converter (25). The single-sideband modulator (1) can be of digital or analog construction; at its input it has a Hilbert transformer which splits the modulating input signal (2) into two component signals which are phase-shifted by 90° and at its output it is also provided with an amplitude computer, a cyclic switch having a clock fre- quency (fT) which is preferably equal to 4 times the carrier frequency (f1) and, if necessary, a quotient computer and a subsequent band-pass filter. A residual carrier signal can be added to the input signal (2) or to the output signals of the Hilbert transformer. (Fig. 2)
500360
Limited Bbc Brown Boveri & Company
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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