CH476432A - Keypad device for dialing by variations in impedance - Google Patents

Keypad device for dialing by variations in impedance

Info

Publication number
CH476432A
CH476432A CH1048967A CH1048967A CH476432A CH 476432 A CH476432 A CH 476432A CH 1048967 A CH1048967 A CH 1048967A CH 1048967 A CH1048967 A CH 1048967A CH 476432 A CH476432 A CH 476432A
Authority
CH
Switzerland
Prior art keywords
dialing
impedance
variations
keypad device
keypad
Prior art date
Application number
CH1048967A
Other languages
French (fr)
Inventor
Monin Claude
Original Assignee
Cit Alcatel
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 Cit Alcatel filed Critical Cit Alcatel
Publication of CH476432A publication Critical patent/CH476432A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Input From Keyboards Or The Like (AREA)
CH1048967A 1966-07-29 1967-07-24 Keypad device for dialing by variations in impedance CH476432A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR71558A FR1525030A (en) 1966-07-29 1966-07-29 Keyboard layout for dialing by impedance variations

Publications (1)

Publication Number Publication Date
CH476432A true CH476432A (en) 1969-07-31

Family

ID=8614519

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1048967A CH476432A (en) 1966-07-29 1967-07-24 Keypad device for dialing by variations in impedance

Country Status (8)

Country Link
US (1) US3508013A (en)
BE (1) BE701754A (en)
CH (1) CH476432A (en)
DE (1) DE1537746A1 (en)
FR (1) FR1525030A (en)
GB (1) GB1195399A (en)
LU (1) LU54185A1 (en)
NL (1) NL6709457A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665489A (en) * 1969-06-06 1972-05-23 Ericsson Telefon Ab L M Telephone instrument for voice frequency choice of number
FR2508199B1 (en) * 1981-06-23 1987-04-30 Renix Electronique Sa KEYBOARD WITH ELECTRIC CONTACTS ACTUATION KEYS AND READING ITS STATE AMONG FOUR POSSIBLE STATES
US8471733B2 (en) * 2006-06-20 2013-06-25 Qualcomm Incorporated Two-wire connection to a key matrix in a mobile device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2927971A (en) * 1957-12-30 1960-03-08 Bell Telephone Labor Inc Subscriber call transmitting system

Also Published As

Publication number Publication date
US3508013A (en) 1970-04-21
BE701754A (en) 1968-01-24
DE1537746A1 (en) 1969-10-16
NL6709457A (en) 1968-01-30
GB1195399A (en) 1970-06-17
FR1525030A (en) 1968-05-17
LU54185A1 (en) 1969-05-21

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Legal Events

Date Code Title Description
PL Patent ceased