Modulation and demodulation apparatus using reference time functions

Claim 2

Modulation apparatus comprising: a source of reference pulses; means for multiplying said reference pulses and an applied carrier signal of predetermined frequency to develop product signals; means for filtering said product signals to develop reference time function signals; means for periodically developing signals proportional to the amplitude of an applied baseband signal; and means for multiplying said reference time function signals and said proportional signals to develop a single-sideband modulated signal.

Claim 3

Modulation apparatus comprising: a source of a train of pulses of constant amplitude; means for forming a product signal of said train of pulses and an applied carrier signal of predetermined frequency; means for filtering said product signal to develop a reference time function signal; means for sampling an applied baseband signal to develop sample pulses having amplitudes corresponding to the instantaneous value of said applied baseband signal; means for altering the amplitude of said sample pulses in accordance with a predetermined reference value; means for storing a signal proportional to the altered amplitude of said sample pulses; and means for forming the product of said reference time function signal and said stored signal to develop a single-sideband modulated signal counterpart of said applied baseband signal.

Claim 4

Modulation apparatus comprising: a source of a train of pulses of constant amplitude; means for forming a product signal of said train of pulses and an applied carrier signal of predetermined frequency; means for filtering said product signal to develop a reference time function signal; means for sampling an applied baseband signal to develop sample pulses having amplitudes corresponding to the instantaneous value of said applied baseband signal; means for altering the amplitude of said sample pulses in accordance with a predetermined reference value; means for storing a signal proportional to the altered amplitude of said sample pulses; and means for forming the product of said reference time function signal and said stored signal to develop a single-sideband modulated signal counterpart of said applied baseband signal.

Claim 5

Modulation apparatus responsive t an applied signal comprising: A source of a train of reference pulses; means for forming a product signal of said train of pulses and an applied carrier signal of predetermined frequency; means for filtering said product signal to develop a reference time function signal; means for periodically developing scaling signals having an amplitude proportional to the instantaneous value of said applied signal; and means for forming the product of said reference time function signal and said scaling signals to develop a single-sideband modulated signal counterpart of said applied signal.

Claim 6

Modulation apparatus responsive t an applied signal comprising: A source of a train of reference pulses; means for forming a product signal of said train of pulses and an applied carrier signal of predetermined frequency; means for filtering said product signal to develop a reference time function signal; means for periodically developing scaling signals having an amplitude proportional to the instantaneous value of said applied signal; and means for forming the product of said reference time function signal and said scaling signals to develop a single-sideband modulated signal counterpart of said applied signal.

Claim 7

A modulation system comprising: means for generating a plurality of trains of reference pulses; a plurality of circuit path means, each responsive to one of said plurality of trains of pulses, each of said circuit path means further comprising means for modulating one of said train of pulses with an applied carrier signal and means for filtering said modulated train of pulses to develop a reference time function; means responsive to an applied baseband signal for developing sample pulses of said baseband signal; means for storing said sample pulses for a predetermined interval of time; and means for multiplying said stored sample pulses and said reference time functions to develop single-sidebaNd modulated signal components.

Claim 8

A modulation system comprising: means for generating a plurality of trains of reference pulses; a plurality of circuit path means, each responsive to one of said plurality of trains of pulses, each of said circuit path means further comprising means for modulating one of said train of pulses with an applied carrier signal and means for filtering said modulated train of pulses to develop a reference time function; means responsive to an applied baseband signal for developing sample pulses of said baseband signal; means for storing said sample pulses for a predetermined interval of time; and means for multiplying said stored sample pulses and said reference time functions to develop single-sidebaNd modulated signal components.

Claim 9

The modulation system defined in claim 4 wherein said system further comprises: a plurality of channels conveying baseband signals; sampling means in each of said channels for developing sample pulses of said baseband signals; a plurality of means for storing said sample pulses for a predetermined interval of time; and a plurality of multiplication means for forming product signals of said reference time functions and said stored sample pulses.

Claim 10

A modulation system comprising: means for generating a plurality of reference pulses; a plurality of circuit paths responsive to said reference pulses, said circuit paths further comprising means for modulating said reference pulses with an applied carrier signal and means for filtering said modulated pulses to develop reference time function signals; means responsive to an applied baseband signal for developing sample pulses of said baseband signals; and means for selectively multiplying said sample pulses and said reference time function signals.

Claim 11

A modulation system comprising: means for generating a plurality of reference pulses; a plurality of circuit paths responsive to said reference pulses, said circuit paths further comprising means for modulating said reference pulses with an applied carrier signal and means for filtering said modulated pulses to develop reference time function signals; means responsive to an applied baseband signal for developing sample pulses of said baseband signals; and means for selectively multiplying said sample pulses and said reference time function signals.

Claim 12

The modulation system defined in claim 6 wherein said system further comprises: a plurality of channels conveying baseband signals; sampling means in each of said channels for developing sample pulses of said baseband signals; and a plurality of means for selectively forming product signals of said reference time function signals and said sample pulses.

Claim 13

Demodulation apparatus comprising: means for generating a plurality of trains of reference pulses; a plurality of circuit path means, each responsive to one of said plurality of pulse trains, and each comprising multiplying means for forming a product signal of one of said pulse trains with a sinusoidal wave of a predetermined frequency and means for filtering said product signal, each of said circuit path means further comprising a pair of means for modulating said filtered product signal with predetermined sinusoidal functions to develop reference time function signals; a pair of circuit means responsive to an applied sigle-sideband modulated signal, each of said circuit means comprising means for modulating said single-sideband signal with a predetermined sinusoidal function, means for filtering said modulated single-sideband signal, and means for developing sample pulses of said filtered modulated signal; means for storing said sample pulses for a predetermined interval of time; means for multiplying said stored sample pulses and said reference time function signals; and means for combining said multiplied pulses an reference signals to develop a baseband demodulated signal counterpart of said applied single-sideband modulated signal.

Claim 14

Demodulation apparatus comprising: means for generating a plurality of trains of reference pulses; a plurality of circuit path means, each responsive to one of said plurality of pulse trains, and each comprising multiplying means for forming a product signal of one of said pulse trains with a sinusoidal wave of a predetermined frequency and means for filtering said product signal, each of said circuit path means further comprising a pair of means for modulating said filtered product signal with predetermined sinusoidal functions to develop reference time function signals; a pair of circuit means responsive to an applied sigle-sideband modulated signal, each of said circuit means comprising means for modulating said single-sideband signal with a predetermined sinusoidal function, means for filtering said modulated single-sideband signal, and means for developing sample pulses of said filtered modulated signal; means for storing said sample pulses for a predetermined interval of time; means for multiplying said stored sample pulses and said reference time function signals; and means for combining said multiplied pulses an reference signals to develop a baseband demodulated signal counterpart of said applied single-sideband modulated signal.

Claim 15

Demodulation apparatus comprising: means for generating a plurality of reference pulses; a plurality of circuit path means responsive to said reference pulses comprising means for forming product signals of said reference pulses with applied sinusoidal waves of a predetermined frequency and means for filtering said product signals, each of said circuit path means further comprising means for forming a product of said filtered product signals and predetermined applied sinusoidal waves to develop reference time function signals; a pair of modulation means responsive to an applied single-sideband modulated signal for forming a pair of demodulated product signals of said single-sideband signal and predetermined applied sinusoidal waves; means for developing sample pulses of each of said demodulated product signals; means for multiplying said sample pulses and said reference time function signals; and means for combining said multiplied signals.

Claim 16

Demodulation apparatus comprising: means for generating a plurality of reference pulses; a plurality of circuit path means responsive to said reference pulses comprising means for forming product signals of said reference pulses with applied sinusoidal waves of a predetermined frequency and means for filtering said product signals, each of said circuit path means further comprising means for forming a product of said filtered product signals and predetermined applied sinusoidal waves to develop reference time function signals; a pair of modulation means responsive to an applied single-sideband modulated signal for forming a pair of demodulated product signals of said single-sideband signal and predetermined applied sinusoidal waves; means for developing sample pulses of each of said demodulated product signals; means for multiplying said sample pulses and said reference time function signals; and means for combining said multiplied signals.

Claim 17

The demodulation apparatus defined in claim 9 wherein said apparatus further comprises: a plurality of channels each conveying single-sideband modulated signals; a pair of modulation means connected in each of said channels for forming a pair of product signals of one of said singLe-sideband modulated signals and predetermined applied sinusoidal waves; means connected in each of said channels for developing sample pulses of each of said pair of product signals; a plurality of means for selectively multiplying said reference time function signals and said sample pulses; and means for combining said multiplied signals to develop a plurality of baseband demodulated single-sideband signal counterparts of said single-sideband modulated signals.

Claim 18

Apparatus for developing a demodulated baseband signal counterpart of an applied single-sideband modulated signal input comprising: means for generating a train of reference pulses; means for multiplying said train of pulses with a sinusoidal wave of a predetermined frequency; means for filtering said multiplied train of pulses to remove undesired signal components; means for multiplying said filtered multiplied train of pulses with a pair of sinusoidal waves of a predetermined frequency to develop reference time function signals; means for multiplying said applied single-sideband modulated signal with a pair of sinusoidal waves of a predetermined frequency; means for developing scaling signals at predetermined periodic intervals having amplitudes corresponding to the magnitude of said multiplied single-sideband signals; and means for multiplying said reference time function signals and said scaling signals.

Claim 19

Apparatus for developing a demodulated baseband signal counterpart of an applied single-sideband modulated signal input comprising: means for generating a train of reference pulses; means for multiplying said train of pulses with a sinusoidal wave of a predetermined frequency; means for filtering said multiplied train of pulses to remove undesired signal components; means for multiplying said filtered multiplied train of pulses with a pair of sinusoidal waves of a predetermined frequency to develop reference time function signals; means for multiplying said applied single-sideband modulated signal with a pair of sinusoidal waves of a predetermined frequency; means for developing scaling signals at predetermined periodic intervals having amplitudes corresponding to the magnitude of said multiplied single-sideband signals; and means for multiplying said reference time function signals and said scaling signals.