Vestigial sideband signal generator

Claim 3

The method of claim 1 wherein said even symmetry amplitude rolloff is a sine rolloff in accordance with the equation for the transform h''(t) of said first waveform g(t)

Claim 4

The method of claim 1 wherein said even symmetry amplitude rolloff is linear rolloff in accordance with the equation for the transform h''''(t) of said first waveform g(t)

Claim 7

The method of claim 4 wherein said odd symmetry phase rolloff is a sine rolloff in accordance with the equation for the transform h''''''(t) of said first waveform g(t)

Claim 8

The method of claim 4 wherein said odd symmetry phase rolloff is a linear rolloff in accordance with the equation for the transform h''''''''(t) of said first waveform g(t)

Claim 9

Apparatus for generating a single vestigial sideband signal by the phase shift method comprising: a source of digital information; a shift clock; serial memory means having a plurality of stages, each of said stages having an output; first circuit means connecting said source to said serial memory means; second circuit means connecting said shift clock to said serial memory means to propagate digital information through each of said stages; baseband sample generator means having a first plurality of 34 resistors, 1-34 respectively, each of said resistors being connected to a different one of said outputs of said stages, the other end of each of said resistors being connected to a first summing means so that the inverse of each of the 34 values .0024, .0017, .0019, .0026, .0012, .0012, .0055, .0080, .0169, .0248, .0413, .0530, .0845, .1119, .1906, .2808, .9265, .9265, .2808, .1906, .1119, .0845, .0530, .0413, .0248, .0169, .0080, .0055, .0012, .0012, .0026, .0019, .0017 and .0024, respectively, for each of said plurality of rEsistors 1-34, respectively, define a first waveform having an amplitude spectrum which is limited to a finite bandwidth, said baseband sample generator means generating at an output of said summing means, amplitude samples of the first waveform containing said digital information; transform sample generator means having a second plurality of 34 resistors, 35-68, respectively, each of said second plurality of resistors being connected to a different one of said outputs of said stages, the other end of each of said second plurality of resistors being connected to a second summing means so that the inverse of each of the 34 values .0006, .0006, 0054, .0054, .0000, .0000, .0095, .0220, .0056, .0056, .0861, .1310, .0263, .9263, .3967, .7324, .3927, .3927, .7324, .3967, .0263, .0263, .1310, .0861, .0056, .0056, .0220, .0095, .0000, .0000, .0045, .0054, .0006 and .0006, respectively, of said second plurality of resistors 35-68, respectively, define a second waveform which is a transform of said first waveform, said transform sample generator means generating at an output of said second summing means, a sample of the second waveform which is a transform of said first waveform having even symmetry sinusoidal amplitude rolloff about zero frequency; first low-pass filter means connected to the output of said first summing means for removing high frequency components from said first waveform; second low-pass filter means connected to the output of said second summing means for removing high frequency components from said second waveform; balanced modulator means connected to said first low-pass filter means for modulating said first waveform onto a first carrier; second modulator means connected to the output of said second low-pass filter means for modulating said second waveform onto a second carrier which is in quadrature phase relationship with said first carrier; summing means connected to the output of said balanced modulator means and the output of said second modulator means for cancelling part of one of the sidebands appearing in the outputs of both modulator means, leaving a single vestigial sideband signal.

Claim 10

Apparatus for generating a single vestigial sideband signal by the phase shift method comprising: a source of digital information; a shift clock; serial memory means having a plurality of stages, each of said stages having an output; first circuit means connecting said source to said serial memory means; second circuit means connecting said shift clock to said serial memory means to propagate digital information through each of said stages; baseband sample generator means having a first plurality of 34 resistors, 1-34 respectively, each of said resistors being connected to a different one of said outputs of said stages, the other end of each of said resistors being connected to a first summing means so that the inverse of each of the 34 values .0024, .0017, .0019, .0026, .0012, .0012, .0055, .0080, .0169, .0248, .0413, .0530, .0845, .1119, .1906, .2808, .9265, .9265, .2808, .1906, .1119, .0845, .0530, .0413, .0248, .0169, .0080, .0055, .0012, .0012, .0026, .0019, .0017 and .0024, respectively, for each of said plurality of rEsistors 1-34, respectively, define a first waveform having an amplitude spectrum which is limited to a finite bandwidth, said baseband sample generator means generating at an output of said summing means, amplitude samples of the first waveform containing said digital information; transform sample generator means having a second plurality of 34 resistors, 35-68, respectively, each of said second plurality of resistors being connected to a different one of said outputs of said stages, the other end of each of said second plurality of resistors being connected to a second summing means so that the inverse of each of the 34 values .0006, .0006, 0054, .0054, .0000, .0000, .0095, .0220, .0056, .0056, .0861, .1310, .0263, .9263, .3967, .7324, .3927, .3927, .7324, .3967, .0263, .0263, .1310, .0861, .0056, .0056, .0220, .0095, .0000, .0000, .0045, .0054, .0006 and .0006, respectively, of said second plurality of resistors 35-68, respectively, define a second waveform which is a transform of said first waveform, said transform sample generator means generating at an output of said second summing means, a sample of the second waveform which is a transform of said first waveform having even symmetry sinusoidal amplitude rolloff about zero frequency; first low-pass filter means connected to the output of said first summing means for removing high frequency components from said first waveform; second low-pass filter means connected to the output of said second summing means for removing high frequency components from said second waveform; balanced modulator means connected to said first low-pass filter means for modulating said first waveform onto a first carrier; second modulator means connected to the output of said second low-pass filter means for modulating said second waveform onto a second carrier which is in quadrature phase relationship with said first carrier; summing means connected to the output of said balanced modulator means and the output of said second modulator means for cancelling part of one of the sidebands appearing in the outputs of both modulator means, leaving a single vestigial sideband signal.

Claim 11

Apparatus for generating a single vestigial sideband signal by the phase shift method comprising: a source of digital information; a shift clock; serial memory means having a plurality of stages, each of said stages having an output; first circuit means connecting said source to said serial memory means; second circuit means connecting said shift clock to said serial memory means to propagate digital information through each of said stages; baseband sample generator means having a first plurality of 34 resistors, 1-34 respectively, each of said resistors being connected to a different one of said outputs of said stages, the other end of each of said resistors being connected to a first summing means so that the inverse of each of the 34 values .0024, .0017, .0019, .0026, .0012, .0012, .0055, .0080, .0169, .0248, .0413, .0530, .0845, .1119, .1906, .2808, .9265, .9265, .2808, .1906, .1119, .0845, .0530, .0413, .0248, .0169, .0080, .0055, .0012, .0012, .0026, .0019, .0017 and .0024, respectively, for each of said plurality of resistors 1-34, respectively, define a first waveform having an amplitude spectrum which is limited to a finite bandwidth, said baseband sample generator means generating at an output of said summing means, amplitude samples of the first waveform containing said digital information; transform sample generator means having a second plurality of 34 resistors, 35-68, respectively, each of said second plurality of resistors being connected to a different one of said outputs of said stages, the other end of each of said second plurality of resistors being connected to a second summing means so that the inverse of each of the 34 values .0097, .0111, .0061, .0046, .0041, .0039, .0049, .0059, .0382, .0559, .0059, .0321, .0910, .1058, .2519, .5787, .2344, .5510, .8861, .5414, .1584, .1428, .2298, .1662, .0671, .0494, .0499, .0239, .0036, .0042, .0136, .0169, .0123 and .0109, respectively, of said second plurality of resistors 35-68, respectively, define a second waveform which is a transform of said first waveform, said transform sample generator means generating at an output of said second summing means, a sample of the second waveform which is a transform of said first waveform having odd symmetry linear phase rolloff about zero frequency; first low-pass filter means connected to the output of said first summing means for removing high frequency components from said first waveform; second low-pass filter means connected to the output of said second summing means for removing high frequency components from said second waveform; balanced modulator means connected to said first low-pass filter means for modulating said first waveform onto a first carrier; second modulator means connected to the output of said second low-pass filter means for modulating said second waveform onto a second carrier which is in quadrature phase relationship with said first carrier; summing means connected to the output of said balanced modulator means for cancelling part of one of the sidebands appearing in the outputs of both modulator means, leaving a single vestigial sideband signal.

Claim 12

Apparatus for generating a single vestigial sideband signal by the phase shift method comprising: a source of digital information; a shift clock; serial memory means having a plurality of stages, each of said stages having an output; first circuit means connecting said source to said serial memory means; second circuit means connecting said shift clock to said serial memory means to propagate digital information through each of said stages; baseband sample generator means having a first plurality of 34 resistors, 1-34 respectively, each of said resistors being connected to a different one of said outputs of said stages, the other end of each of said resistors being connected to a first summing means so that the inverse of each of the 34 values .0024, .0017, .0019, .0026, .0012, .0012, .0055, .0080, .0169, .0248, .0413, .0530, .0845, .1119, .1906, .2808, .9265, .9265, .2808, .1906, .1119, .0845, .0530, .0413, .0248, .0169, .0080, .0055, .0012, .0012, .0026, .0019, .0017 and .0024, respectively, for each of said plurality of resistors 1-34, respectively, define a first waveform having an amplitude spectrum which is limited to a finite bandwidth, said baseband sample generator means generating at an output of said summing means, amplitude samples of the first waveform containing said digital information; transform sample generator means having a second plurality of 34 resistors, 35-68, respectively, each of said second plurality of resistors being connected to a different one of said outputs of said stages, the other end of each of said second plurality of resistors being connected to a second summing means so that the inverse of each of the 34 values .0097, .0111, .0061, .0046, .0041, .0039, .0049, .0059, .0382, .0559, .0059, .0321, .0910, .1058, .2519, .5787, .2344, .5510, .8861, .5414, .1584, .1428, .2298, .1662, .0671, .0494, .0499, .0239, .0036, .0042, .0136, .0169, .0123 and .0109, respectively, of said second plurality of resistors 35-68, respectively, define a second waveform which is a transform of said first waveform, said transform sample generator means generating at an output of said second summing means, a sample of the second waveform which is a transform of said first waveform having odd symmetry linear phase rolloff about zero frequency; first low-pass filter means connected to the output of said first summing means for removing high frequency components from said first waveform; second low-pass filter means connected to the output of said second summing means for removing high frequency components from said second waveform; balanced modulator means connected to said first low-pass filter means for modulating said first waveform onto a first carrier; second modulator means connected to the output of said second low-pass filter means for modulating said second waveform onto a second carrier which is in quadrature phase relationship with said first carrier; summing means connected to the output of said balanced modulator means for cancelling part of one of the sidebands appearing in the outputs of both modulator means, leaving a single vestigial sideband signal.