Ideal Single Sideband Modulation

Single sideband (SSB) modulation is a consequence of double sideband (DSB) suppressed carrier modulation. An outline of the DSB Laplace transform formalism is presented and this is followed by a simple SSB theory. The ordinary SSB modulator and demodulator are not enough for the task and a modification is needed to achieve SSB at one input frequency. SSB operation at other frequencies is aided by insertion of Butterworth filters in channels. Two "corner frequencies" of a Butterworth filter are related to carrier and lowest input data frequencies. It is readily demonstrated that a Butterworth flter of an order greater than 32 is required to reduce channel contaminants.