GB1182879A - Improvements in Data Transmitting Apparatus. - Google Patents

Improvements in Data Transmitting Apparatus.

Info

Publication number
GB1182879A
GB1182879A GB25896/68A GB2589668A GB1182879A GB 1182879 A GB1182879 A GB 1182879A GB 25896/68 A GB25896/68 A GB 25896/68A GB 2589668 A GB2589668 A GB 2589668A GB 1182879 A GB1182879 A GB 1182879A
Authority
GB
United Kingdom
Prior art keywords
time base
key
operated
cycle
character
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB25896/68A
Inventor
Roger William Dawson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Creed and Co Ltd
Original Assignee
Creed and Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Creed and Co Ltd filed Critical Creed and Co Ltd
Priority to GB25896/68A priority Critical patent/GB1182879A/en
Priority to US828502A priority patent/US3612765A/en
Priority to FR6917727A priority patent/FR2009660A1/fr
Publication of GB1182879A publication Critical patent/GB1182879A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Communication Control (AREA)

Abstract

1,182,879. Telegraphy. CREED & CO. Ltd. 30 May, 1968, No. 25896/68. Heading H4P. A keyboard transmitter includes a circuit which ensures that the time base is started and stopped at the correct times in spite of poor keying. When a key is operated a character is sent to line via the transmitter under control of time base TB, Fig. 1. Trip-switch TC is operated when a key is pressed, so causing a signal to pass from TC, via gate Gl, to set bi-stable B2, which energizes magnet EM which holds the key down. There being no output g from B2, gates G3, G4 give no output and so the time base starts. Apart from passing pulses to the transmitter, the time base generates pulses P1, P4 and P14 at the beginning, middle, and end, of a character cycle. Consequently magnet EM is de-energized when P4 occurs and the time base is stopped when P14 occurs. If repeat switch RS is operated the time base is not released unt il TC is also operated in response to depression of a key. If either the key or the repeat switch is released during a cycle the time base stops at the end of the current cycle. If a key which has been released in the middle P4 of a cycle is pressed again before the end of the current cycle the time base cycles a second time before stopping, so that the character is transmitted twice.
GB25896/68A 1968-05-30 1968-05-30 Improvements in Data Transmitting Apparatus. Expired GB1182879A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB25896/68A GB1182879A (en) 1968-05-30 1968-05-30 Improvements in Data Transmitting Apparatus.
US828502A US3612765A (en) 1968-05-30 1969-05-28 Keyboard logic system
FR6917727A FR2009660A1 (en) 1968-05-30 1969-05-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25896/68A GB1182879A (en) 1968-05-30 1968-05-30 Improvements in Data Transmitting Apparatus.

Publications (1)

Publication Number Publication Date
GB1182879A true GB1182879A (en) 1970-03-04

Family

ID=10235118

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25896/68A Expired GB1182879A (en) 1968-05-30 1968-05-30 Improvements in Data Transmitting Apparatus.

Country Status (3)

Country Link
US (1) US3612765A (en)
FR (1) FR2009660A1 (en)
GB (1) GB1182879A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982236A (en) * 1974-12-24 1976-09-21 Haig Kafafian Communications and control method and apparatus for persons who may have muscular incoordination and/or spasticity

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053723A (en) * 1962-04-03
US3456077A (en) * 1965-09-22 1969-07-15 Navigation Computer Corp High speed electronic keyboard assembly
US3457368A (en) * 1965-11-15 1969-07-22 Bell Telephone Labor Inc Code character keyboard sender
US3466647A (en) * 1967-07-31 1969-09-09 Scm Corp Data signal generating apparatus

Also Published As

Publication number Publication date
US3612765A (en) 1971-10-12
FR2009660A1 (en) 1970-02-06

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PLNP Patent lapsed through nonpayment of renewal fees