US4313203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission system for the transmission of binary data symbols
Assignee: US Philips Corp
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Filing: 1980-03-26
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Granted: 1982-01-26
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Expires: 2000-03-26
Abstract
Abstract A transmission system for the transmission of binary data symbols is described in which a so-called "crankshaft code," in combination with a receiver having a special filter characteristic, enables a more optimum signal detection, independent of the cable characteristic. The system is used for digital transmission over cables in the local telephone network.
Inventors
- 👤 Petrus J. VAN Gerwen
- 👤 Wilfred A. M. Snijders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:09
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4917; H04L25/4923; H04L25/4925
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
A transmission system comprising a transmitter and a receiver for the transmitter of binary data symbols in synchronous consecutive symbol time intervals having a duration of T seconds, characterized in that the transmitter comprises means for converting each data symbol into two rectangular pulses of opposite polarity, corresponding points of which are separated by a duration of T/2 seconds, each pulse having a duration of T/4 seconds, and occurring at, or after, a respective period from the beginning of the symbol time interval, and, that the receiver comprises means for filtering the received signal, comprising the converted data symbols, in accordance with a low-pass filter characteristic having zeros at 0 Hz and 2/T Hz and a sinusoidal response curve between said zero frequencies.
Claim 2
Dependent Claim
123 words
A transmission system comprising a transmitter and a receiver for the transmitter of binary data symbols in synchronous consecutive symbol time intervals having a duration of T seconds, characterized in that the transmitter comprises means for converting each data symbol into two rectangular pulses of opposite polarity, corresponding points of which are separated by a duration of T/2 seconds, each pulse having a duration of T/4 seconds, and occurring at, or after, a respective period from the beginning of the symbol time interval, and, that the receiver comprises means for filtering the received signal, comprising the converted data symbols, in accordance with a low-pass filter characteristic having zeros at 0 Hz and 2/T Hz and a sinusoidal response curve between said zero frequencies.
Claim 3
Dependent Claim
70 words
A receiver for use in the transmission system as claimed in claim 1, characterized in that the receiver comprises, in combination with a signal regeneration device, a low-pass filter coupled to the input of said receiver having a filter characteristic with a maximum at 0 Hz and a zero at 2/T Hz and a cosinusoidal response between said maximum and the zero, and a differentiating network arranged in cascade therewith.
Claim 4
Dependent Claim
92 words
A receiver for use in the transmission system as claimed in claim 1, characterized in that the receiver comprises, in combination with a signal regeneration device, a low-pass filter having a uniform filter characteristic between 0 Hz and 2/T Hz, two sampling circuits, having a sampling rate of 1/T Hz and operating with a mutual time difference of T/2 seconds, connected to the output of the low-pass filter, and means for applying the difference between the signal samples produced by the sampling circuits to the signal regeneration device in each symbol interval.
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) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |