US4041239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the transmission of data
Assignee: Siemens AG
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Filing: 1974-09-04
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Granted: 1977-08-09
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Expires: 1994-09-04
Abstract
Abstract A method and apparatus for transmitting data so as to reduce the effects of signal distortions caused by the transmission medium are described. The data signal is encoded and formed into a combination of wide rectangular pulses and narrow rectangular pulses having a width equal to half that of the wide pulses. The wide pulse portion of the encoded signal is preliminarily distorted, and a combination of the distorted wide pulses and the narrow pulses is transmitted.
Inventors
- 👤 Adolf Haass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:24
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03828; H04L25/03834
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
Apparatus for transmitting data so as to reduce the effects of signal distortions caused by a transmission medium, comprising: a source of data signals, encoding means for forming from said data signals a combination of wide rectangular pulses and narrow rectangular pulses having a pulse width equal to half the width of said wide rectangular pulses, discriminator means for producing a discriminator signal upon the appearance of a said wide rectangular pulse, multiplier means for producing a pre-distorted signal by multiplying said encoded data signal with said discriminator signal and means for transmitting said pre-distorted signal and said narrow rectangular pulses over the transmission medium.
Claim 2
Dependent Claim
105 words
Apparatus for transmitting data so as to reduce the effects of signal distortions caused by a transmission medium, comprising: a source of data signals, encoding means for forming from said data signals a combination of wide rectangular pulses and narrow rectangular pulses having a pulse width equal to half the width of said wide rectangular pulses, discriminator means for producing a discriminator signal upon the appearance of a said wide rectangular pulse, multiplier means for producing a pre-distorted signal by multiplying said encoded data signal with said discriminator signal and means for transmitting said pre-distorted signal and said narrow rectangular pulses over the transmission medium.
Claim 3
Dependent Claim
33 words
The apparatus defined in claim 1 wherein said discriminator means comprises a logic gate which has as inputs said data signal and a signal characterizing the pulse edges of said narrow rectangular pulses.
Claim 4
Dependent Claim
87 words
The apparatus defined in claim 1 wherein said discriminator comprises: a shift register having first and second stages which are supplied with said encoded data signals, first EXCLUSIVE-OR gate means having an input connected to an input and output of said first stage, second EXCLUSIVE-OR gate means having an input connected to an input and an output of said second stage, And gate means having inputs connected to outputs of said first and second EXCLUSIVE-OR gate means, the output of said AND gate forming said discriminator signal.
Claim 5
Dependent Claim
22 words
The apparatus defined in claim 1 wherein said multiplier means comprises an amplifier having an amplification factor controlled by said discriminator signal.
Claim 6
Independent Claim
104 words
A method for the transmission of data signals whereby the effects of signal distortions caused by the transmission medium are reduced, comprising: generating said data signals, encoding said data signals to form encoded data signals comprising wide rectangular pulses and narrow rectangular pulses having a pulse width equal to half the width of said wide rectangular pulses, delaying said encoded data signals for a period equal to the pulse width of said narrow rectangular pulses, inverting said delayed encoded data signals, adding said inverted signals and said encoded data signals to produce a predistorted signal and transmitting said predistorted signal over the transmission medium.
Claim 7
Independent Claim
104 words
A method for the transmission of data signals whereby the effects of signal distortions caused by the transmission medium are reduced, comprising: generating said data signals, encoding said data signals to form encoded data signals comprising wide rectangular pulses and narrow rectangular pulses having a pulse width equal to half the width of said wide rectangular pulses, delaying said encoded data signals for a period equal to the pulse width of said narrow rectangular pulses, inverting said delayed encoded data signals, adding said inverted signals and said encoded data signals to produce a predistorted signal and transmitting said predistorted signal over the transmission medium.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |