US4255813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dicode transmission system
Assignee: Ohkura Electric Co Ltd
•
Filing: 1978-11-17
•
Granted: 1981-03-10
•
Expires: 1998-11-17
Abstract
Abstract A dicode transmission system wherein a data is transmitted with the aid of an intermittent asynchronous system in the form of dicode signal. The disclosed system delivers a reset pulse from a transmitter side prior to the starting of a text transmission.
Inventors
- 👤 Seiichi Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:16
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/0078; H04L1/0083; H04L25/00; H04L25/38; H04L25/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
145 words
In an asynchronous transmission system for transmitting a text as dicode signals having start and stop bits, the improvement comprising: (a) a data holding register for retaining said text to be transmitted and a reset pulse bit, and for sequentially delivering data in a bit-parallel, word-serial form just after transmission of said reset pulse bit; (b) a parallel-to-serial converter connected to said data holding register for receiving and converting said data to an output serial signal stream having said start and stop bits; (c) a dicode encoding circuit connected to said parallel-to-serial converter for receiving said output serial signal stream therefrom; and (d) OR-gating means connected to said data holding register for receiving said reset pulse bit therefrom and connected to said dicode encoding circuit for receiving an output therefrom; said OR-gating means delivering an output to a transmission line via a line driving circuit.
Claim 2
Dependent Claim
145 words
In an asynchronous transmission system for transmitting a text as dicode signals having start and stop bits, the improvement comprising: (a) a data holding register for retaining said text to be transmitted and a reset pulse bit, and for sequentially delivering data in a bit-parallel, word-serial form just after transmission of said reset pulse bit; (b) a parallel-to-serial converter connected to said data holding register for receiving and converting said data to an output serial signal stream having said start and stop bits; (c) a dicode encoding circuit connected to said parallel-to-serial converter for receiving said output serial signal stream therefrom; and (d) OR-gating means connected to said data holding register for receiving said reset pulse bit therefrom and connected to said dicode encoding circuit for receiving an output therefrom; said OR-gating means delivering an output to a transmission line via a line driving circuit.
Claim 3
Dependent Claim
108 words
The asynchronous transmission system according to claim 1 wherein said dicode encoding circuit comprises shift register means for delaying said output signal of said parallel-to-serial converter by a given, predetermined time, and for generating first and second pulse signals corresponding to positive and negative pulses of said dicode signals, respectively, and further comprising gating means connected for receiving said first and second pulse signals and for delivering a further output signal of said dicode encoding circuit to said line driving circuit, said line driving circuit providing an output which is fed to a center-tapped primary winding of a transformer having a secondary winding connected to said transmission line.
Claim 4
Dependent Claim
56 words
The asynchronous transmission system according to claim 1 wherein said reset pulse is inserted prior to the transmission of said text for always bringing a receiver side condition into an initial state and thereby preventing occurrence of transmission errors due to noise while carrying out a data transmission with the aid of the dicode in practice.
Claim 5
Dependent Claim
77 words
The asynchronous transmission system according to claim 3 wherein said reset pulse is a positive pulse having the same polarity as that of said stop bits transmitted in said dicode signals, and wherein said reset pulse is transmitted closely before the time for starting transmission of said text for always bringing said receiver side condition into a "1" prior to receiving said text even when said receiver side condition has been converted into "0" due to noise.
Claim 6
Dependent Claim
29 words
The asynchronous transmission system according to claim 1 further comprising means for transmitting said reset pulse with a duration differing from that of pulses associated with said dicode signals.
Claim 7
Dependent Claim
19 words
The asynchronous transmission system according to claim 1 including input means for analog and digital data to be transmitted.
Claim 8
Dependent Claim
40 words
The asynchronous transmission system according to claim 1 further comprising a receiving system for signals transmitted by other similar transmission systems, said receiving system including output means for outputting said received dicode signals as digital and as analog output signals.
Claim 9
Dependent Claim
37 words
The asynchronous transmission system according to claim 1 further comprising receiving means for receiving dicode signals from said transmission line, and decoding means connected to said receiving means for converting the received dicode signal to NRZ signals.
Claim 10
Dependent Claim
44 words
An asynchronous transmission system according to claim 8 wherein said received dicode signals are serial signals, said decoding means providing serial NRZ signals, and further comprising serial-to-parallel converter means connected to said decoding means for converting said serial NRZ signals to parallel NRZ signals.
References Cited (Backward Citations)
US3419679A
Cited
US3492423A
Cited
US3614620A
Cited
US3560860A
Cited
US3601537A
Cited
US3710027A
Cited
US3612906A
Cited
US3754098A
Cited
US3808366A
Cited
US3798608A
Cited
US3909724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |