US3882485A
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Universal polybinary modem
Assignee: Verizon Laboratories Inc
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Filing: 1973-10-03
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Granted: 1975-05-06
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Expires: 1993-10-03
Abstract
Abstract A method and apparatus for forming polybinary signals of a desired class with a universal polybinary modem are described. The universal polybinary modem enables the selection of a class of polybinary signals which have essentially zero energy at an upper band edge. As described with reference to one embodiment the desired class of polybinary signals is obtained by selectively combining the outputs of taps of a delay line whose taps are spaced at intervals corresponding to the baud rate of the data. The combination involves multiplication, addition or subtractions in accordance with the desired class of polybinary signals. In an alternate embodiment a digital network is provided to obtain the desired class of polybinary signals.
Inventors
- 👤 Leo I Bluestein
- 👤 John H Meyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:01
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4917
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
104 words
A method for generating polybinary signals for high rate communication with predetermined bandwidth along a channel, the polybinary signals being of a family characterized by signal classes having essentially zero energy at an upper band edge, comprising the steps of selecting precoded data signals at intervals corresponding to successive data; the precoded data signals being precoded for transmission of data at a predetermined rate and in a form for a desired polybinary class; arithmetically combining the selected precoded data signals in a manner corresponding to the desired polybinary signal class; and passing the arithmetically combined precoded data signals through a duobinary wave shaping network.
Claim 2
Independent Claim
104 words
A method for generating polybinary signals for high rate communication with predetermined bandwidth along a channel, the polybinary signals being of a family characterized by signal classes having essentially zero energy at an upper band edge, comprising the steps of selecting precoded data signals at intervals corresponding to successive data; the precoded data signals being precoded for transmission of data at a predetermined rate and in a form for a desired polybinary class; arithmetically combining the selected precoded data signals in a manner corresponding to the desired polybinary signal class; and passing the arithmetically combined precoded data signals through a duobinary wave shaping network.
Claim 3
Dependent Claim
80 words
The method for generating polybinary signals for a desired class as claimed in claim 1 wherein the selecting step further includes sampling the precoded data signal at intervals corresponding to successive data; storing the samples in successively located networks; shifting the samples along the successively located networks; and wherein the arithmetic combining step includes the step of arithmetically combining selected ones of the stored samples in the networks in a manner determined by the desired polybinary class for production thereof.
Claim 4
Dependent Claim
71 words
The method for generating polybinary signals of a desired class as claimed in claim 1 wherein the selecting step further includes advancing the precoded data signal along a tapped delay line having taps whose spacing corresponds to intervals between successive data and wherein the combining step includes the step of arithmetically combining the signal values at selected tapts of the tapped delay line to form the desired class of polybinary signals.
Claim 5
Independent Claim
132 words
A method for generating polybinary signals for high band rate data communication along a channel of limited bandwidth, the polybinary signals being of a family characterized by signal classes having essentially zero energy at the upper band edge of the communication channel with data being transmitted at a predetermined baud rate, comprising the steps of selecting precoded data signals at predetermined baud intervals selected for formation of a desired polybinary class, the data signals being precoded for the transmission of data at the baud rate through the channel in a form for the desired polybinary class; arithmetically combining the selected data signals in a manner determined by the desired polybinary signal class to form said desired polybinary signals; and passing the arithmetically combined precoded data signals through a duobinary wave shaping filter.
Claim 6
Independent Claim
132 words
A method for generating polybinary signals for high band rate data communication along a channel of limited bandwidth, the polybinary signals being of a family characterized by signal classes having essentially zero energy at the upper band edge of the communication channel with data being transmitted at a predetermined baud rate, comprising the steps of selecting precoded data signals at predetermined baud intervals selected for formation of a desired polybinary class, the data signals being precoded for the transmission of data at the baud rate through the channel in a form for the desired polybinary class; arithmetically combining the selected data signals in a manner determined by the desired polybinary signal class to form said desired polybinary signals; and passing the arithmetically combined precoded data signals through a duobinary wave shaping filter.
Claim 7
Dependent Claim
148 words
A universal polybinary modem for use in a system in which data signals precoded for a desired class of polybinary signals having essentially zero energy at an upper band edge are transmitted along a communications channel at a high baud rate and are decoded at a receiving end of the channel comprising means for selecting the precoded data signals at successive intervals corresponding to the baud rate employed in the precoded data signals; means, connected to the output of the selecting means, for arithmetically combining predetermined selected precoded data signals in accordance with a desired class of polybinary signals having a power spectrum of essentially zero at the upper band edge; and a duobinary wave shaping network in line with the communications channel, the network receiving the output of the combining means and, in conjunction with the selecting and combining means, forming the desired class of polybinary signals.
Claim 8
Dependent Claim
148 words
A universal polybinary modem for use in a system in which data signals precoded for a desired class of polybinary signals having essentially zero energy at an upper band edge are transmitted along a communications channel at a high baud rate and are decoded at a receiving end of the channel comprising means for selecting the precoded data signals at successive intervals corresponding to the baud rate employed in the precoded data signals; means, connected to the output of the selecting means, for arithmetically combining predetermined selected precoded data signals in accordance with a desired class of polybinary signals having a power spectrum of essentially zero at the upper band edge; and a duobinary wave shaping network in line with the communications channel, the network receiving the output of the combining means and, in conjunction with the selecting and combining means, forming the desired class of polybinary signals.
Claim 9
Dependent Claim
58 words
The universal polybinary modem as claimed in claim 5 wherein the selecting means further includes a tapped delay line having taps located at intervals corresponding to the time period T equal to the baud interval between data signals, with predetermined precoded data signals present on the taps being formed into the desired polybinary class by the combining means.
Claim 10
Dependent Claim
90 words
The universal polybinary modem as claimed in claim 5 wherein the selecting means further includes means for sampling the data signals at intervals equivalent to the baud rate; means for storing the sampled signals in successively located storage elements; means for shifting the stored samples along the storing means at a rate equivalent to the sampling rate, and wherein the combining means includes means for operating on selected ones of the stored signals in accordance with the desired class of polybinary signals to form said desired class of polybinary signals.
Claim 11
Dependent Claim
31 words
The universal polybinary modem as claimed in claim 7 wherein the operating means includes means for multiplying the selected ones of stored signals; and means for adding the multiplied selected signals.
Claim 12
Dependent Claim
121 words
A universal polybinary modem wherein data signals, which are precoded for a desired class of polybinary signals, are transformed into the desired polybinary class for transmission along a communication channel of limited bandwidth at a high baud rate comprising a duobinary wave shaping network located in line with the communication channel to limit the energy of the polybinary signals essentially to zero at the upper band edge; means for selecting the precoded data signals at intervals spaced in time substantially equal to the baud rate of the data signals; and means for arithmetically combining predetermined selections of the precoded data signals in a manner for forming the desired class of polybinary signals which are applied to the duobinary wave shaping network.
Claim 13
Dependent Claim
121 words
A universal polybinary modem wherein data signals, which are precoded for a desired class of polybinary signals, are transformed into the desired polybinary class for transmission along a communication channel of limited bandwidth at a high baud rate comprising a duobinary wave shaping network located in line with the communication channel to limit the energy of the polybinary signals essentially to zero at the upper band edge; means for selecting the precoded data signals at intervals spaced in time substantially equal to the baud rate of the data signals; and means for arithmetically combining predetermined selections of the precoded data signals in a manner for forming the desired class of polybinary signals which are applied to the duobinary wave shaping network.
Claim 14
Dependent Claim
33 words
The universal polybinary modem as claimed in claim 9 wherein the selecting means includes a tapped delay line having output taps located at intervals corresponding to the baud rate of the data signals.
Claim 15
Dependent Claim
67 words
The universal polybinary modem as claimed in claim 10 wherein the combining means includes a class selection network coupled to select output taps of the delay line for arithmetically combining the predetermined selections into the desired class of polybinary signals; and wherein the combining means further includes operating means for adding and multiplying the signals on selected output taps to form the desired class of polybinary signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |