JPS54120503A - Coding system for push-button dial signal - Google Patents

Coding system for push-button dial signal

Info

Publication number
JPS54120503A
JPS54120503A JP2788278A JP2788278A JPS54120503A JP S54120503 A JPS54120503 A JP S54120503A JP 2788278 A JP2788278 A JP 2788278A JP 2788278 A JP2788278 A JP 2788278A JP S54120503 A JPS54120503 A JP S54120503A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
bits
push
coding system
dial signal
higher
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.)
Pending
Application number
JP2788278A
Inventor
Nobuhisa Ayugase
Hideo Kishimoto
Keiichi Nagakura
Masaaki Terai
Original Assignee
Nippon Telegr & Teleph Corp <Ntt>
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

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M11/00Telephonic communication systems adapted for combination with other electrical systems
    • H04M11/06Simultaneous speech and telegraphic or other data transmission over the same conductors
    • H04M11/066Telephone sets adapted for data transmision

Abstract

PURPOSE:To improve operation with an increase in number of signals suppressed by coding one character into two two-frequency signals. CONSTITUTION:Depressing push button 2 of push-buttom dial 1 of four by four selects and sends one each of signal frequencies 3 and 4. For example, a two-frequency signal has frequencies of 697 and 1209 Hz. Then, assigning lower four bits through the 1st depression and higher three or four bits through the 2nd depression makes it possible to code seven or eight bits, namely, 128 or 256 characters. An example is the selection of ''4''(100) regarding ''A'' of a JIS code as lower four bits and ''1''(0001) as higher three bits.
JP2788278A 1978-03-11 1978-03-11 Coding system for push-button dial signal Pending JPS54120503A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2788278A JPS54120503A (en) 1978-03-11 1978-03-11 Coding system for push-button dial signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2788278A JPS54120503A (en) 1978-03-11 1978-03-11 Coding system for push-button dial signal

Publications (1)

Publication Number Publication Date
JPS54120503A true true JPS54120503A (en) 1979-09-19

Family

ID=12233252

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2788278A Pending JPS54120503A (en) 1978-03-11 1978-03-11 Coding system for push-button dial signal

Country Status (1)

Country Link
JP (1) JPS54120503A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59500038A (en) * 1981-12-29 1984-01-05
JP2002028878A (en) * 2000-06-16 2002-01-29 Hilti Ag Hand tool device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4912505A (en) * 1972-05-18 1974-02-04
JPS4922042A (en) * 1972-06-19 1974-02-27
JPS4953702A (en) * 1972-07-26 1974-05-24

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4912505A (en) * 1972-05-18 1974-02-04
JPS4922042A (en) * 1972-06-19 1974-02-27
JPS4953702A (en) * 1972-07-26 1974-05-24

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59500038A (en) * 1981-12-29 1984-01-05
JP2002028878A (en) * 2000-06-16 2002-01-29 Hilti Ag Hand tool device

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