Single-sideband modulator

Claim 2

A modulator comprising: a plurality of parallel branch circuits each comprising first means for developing the modulation product of an applied signal and a first modulating signal, said first modulating signal being a function of the maximum frequency component of said applied signal and the imaginary part of the poles of a predetermined filter transfer function, a filter network responsive to said modulation product characterized by a transfer function realizable with noninductive elements having poles corresponding to the real part of the poles of said predetermined filter transfer function, and second means responsive to the output signals of said filter network for developing a modulation product of said output signals and a second modulating signal, said second modulating signal being a function of a predetermined carrier frequency, said maximum frequency component and said imaginary part of the poles of said predetermined filter transfer function, and means for combining the signals developed at the output of said branch circuits in order to develop a single-sideband modulated version of said applied signal.

Claim 3

A single-sideband modulator comprising: a plurality of parallel branch circuits each comprising first means for developing the modulation product of an applied signal and a first modulating function, said first modulating function itself being the product of two sinusoidal waveforms having arguments, respectively, which are functions of the maximum frequency component of said applied signal and the imaginary part of the poles of a predetermined filter transfer function, a noninductive filter network responsive to said modulation product, and second means responsive to the output signals of said filter network for developing a product of said output signals and a second modulation function, said second modulation function itself being the product of two sinusoidal waveforms having arguments, respectively, which are functions of a predetermined carrier frequency, said maximum frequency component, and said imaginary part of the poles of said predetermined filter transfer function, and means for combining the signals developed at the output of said branch circuits.

Claim 4

A single-sideband modulator comprising: a plurality of parallel branch circuits each comprising first means for developing the modulation product of an applied signal and a first modulating function, said first modulating function itself being the product of two sinusoidal waveforms having arguments, respectively, which are functions of the maximum frequency component of said applied signal and the imaginary part of the poles of a predetermined filter transfer function, a noninductive filter network responsive to said modulation product, and second means responsive to the output signals of said filter network for developing a product of said output signals and a second modulation function, said second modulation function itself being the product of two sinusoidal waveforms having arguments, respectively, which are functions of a predetermined carrier frequency, said maximum frequency component, and said imaginary part of the poles of said predetermined filter transfer function, and means for combining the signals developed at the output of said branch circuits.

Claim 7

A single-sideband modulator comprising: a source of band limited signals, a plurality of circuit paths responsive to said signals, at least one of said circuit paths further comprising the serial connection of first means, a noninductive filter network, and second means, said first means forming a product of said band limited signals and an applied waveform representing the product of two predetermined waveforms which are, respectively, functions of the maximum frequency component of said band limited signals and the imaginary part of the poles of a predetermined filter transfer function, said noninductive filter network having poles corresponding to the real part of the poles of said predetermined filter transfer function, and said second means forming a product of the output signals of said noninductive filter and an applied waveform representing the product of two predetermined waveforms which are, respectively, functions of said maximum frequency component and a predetermined carrier frequency, and said imaginary part of the poles of said predetermined filter transfer function, and means for arithmetically combining the signals developed by each of said circuit paths.

Claim 8

A single-sideband modulator comprising: a source of band limited signals, a plurality of circuit paths responsive to said signals, at least one of said circuit paths further comprising the serial connection of first means, a noninductive filter network, and second means, said first means forming a product of said band limited signals and an applied waveform representing the product of two predetermined waveforms which are, respectively, functions of the maximum frequency component of said band limited signals and the imaginary part of the poles of a predetermined filter transfer function, said noninductive filter network having poles corresponding to the real part of the poles of said predetermined filter transfer function, and said second means forming a product of the output signals of said noninductive filter and an applied waveform representing the product of two predetermined waveforms which are, respectively, functions of said maximum frequency component and a predetermined carrier frequency, and said imaginary part of the poles of said predetermined filter transfer function, and means for arithmetically combining the signals developed by each of said circuit paths.

Claim 9

A single-sideband modulator comprising: a source of sampled band limited signals, means for selectively commutating said signals at a frequency related to the maximum frequency component of said band limited signals, a plurality of circuit paths responsive to said commutated signals, at least one of said circuit paths further comprising the serial connection of a noninductive filter, having poles corresponding to the real part of the poles of a predetermined filter transfer function, and modulating means, said modulating means developing a signal proportional to the product of signals developed by said noninductive filter and a predetermined waveform functionally related to said maximum frequency component, the imaginary part of the poles of said predetermined filter transfer function, and a predetermined carrier frequency, and means for arithmetically combining the signals of each of said circuit paths.

Claim 10

A single-sideband modulator comprising: a source of sampled band limited signals, means for selectively commutating said signals at a frequency related to the maximum frequency component of said band limited signals, a plurality of circuit paths responsive to said commutated signals, at least one of said circuit paths further comprising the serial connection of a noninductive filter, having poles corresponding to the real part of the poles of a predetermined filter transfer function, and modulating means, said modulating means developing a signal proportional to the product of signals developed by said noninductive filter and a predetermined waveform functionally related to said maximum frequency component, the imaginary part of the poles of said predetermined filter transfer function, and a predetermined carrier frequency, and means for arithmetically combining the signals of each of said circuit paths.

Claim 11

Single-sideband modulation apparatus comprising: a source of input signals, means for sampling said input signals, means responsive to said sampled signals for sequentially applying said sampled signals to a plurality of circuit paths, multipath network means, exhibiting a plurality of signal path transfer functions, connected to said circuit paths for selectively altering the magnitude of each of said applied signals by predetermined multiplication factors, a plurality of noninductive filter network means having poles corresponding to the real part of the poles of a predetermined filter transfer function, each filter network responsive to one of said magnitude altered signals for changing the frequency characteristics of said signals, a plurality of modulation means, each respectively connected to one of said filter network means, for multiplying filtered signals with a predetermined waveform functionally related to the maximum frequency component of said input signals, the imaginary part of the poles of said predetermined filter transfer function, and a predetermined carrier frequency, and means responsive to the signals developed by said plurality of modulation means for arithmetically combining said signals.

Claim 12

Single-sideband modulation apparatus comprising: a source of input signals, means for sampling said input signals, means responsive to said sampled signals for sequentially applying said sampled signals to a plurality of circuit paths, multipath network means, exhibiting a plurality of signal path transfer functions, connected to said circuit paths for selectively altering the magnitude of each of said applied signals by predetermined multiplication factors, a plurality of noninductive filter network means having poles corresponding to the real part of the poles of a predetermined filter transfer function, each filter network responsive to one of said magnitude altered signals for changing the frequency characteristics of said signals, a plurality of modulation means, each respectively connected to one of said filter network means, for multiplying filtered signals with a predetermined waveform functionally related to the maximum frequency component of said input signals, the imaginary part of the poles of said predetermined filter transfer function, and a predetermined carrier frequency, and means responsive to the signals developed by said plurality of modulation means for arithmetically combining said signals.