CA982714A - Audible signalling means for a telephone - Google Patents

Audible signalling means for a telephone

Info

Publication number
CA982714A
CA982714A CA204,645A CA204645A CA982714A CA 982714 A CA982714 A CA 982714A CA 204645 A CA204645 A CA 204645A CA 982714 A CA982714 A CA 982714A
Authority
CA
Canada
Prior art keywords
telephone
signalling means
audible signalling
audible
signalling
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
CA204,645A
Other versions
CA204645S (en
Inventor
Tapio H. Murto
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.)
Nortel Networks Ltd
Original Assignee
Northern Electric 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 Northern Electric Co Ltd filed Critical Northern Electric Co Ltd
Priority to CA204,645A priority Critical patent/CA982714A/en
Application granted granted Critical
Publication of CA982714A publication Critical patent/CA982714A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
CA204,645A 1974-07-12 1974-07-12 Audible signalling means for a telephone Expired CA982714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA204,645A CA982714A (en) 1974-07-12 1974-07-12 Audible signalling means for a telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA204,645A CA982714A (en) 1974-07-12 1974-07-12 Audible signalling means for a telephone

Publications (1)

Publication Number Publication Date
CA982714A true CA982714A (en) 1976-01-27

Family

ID=4100639

Family Applications (1)

Application Number Title Priority Date Filing Date
CA204,645A Expired CA982714A (en) 1974-07-12 1974-07-12 Audible signalling means for a telephone

Country Status (1)

Country Link
CA (1) CA982714A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4514596A (en) * 1980-07-17 1985-04-30 Plessey Overseas Limited Telephone handsets
EP0146185A2 (en) * 1983-12-15 1985-06-26 Koninklijke Philips Electronics N.V. Telephone circuit comprising a class-B amplifier
EP0261319A2 (en) * 1986-09-26 1988-03-30 KE KOMMUNIKATIONS-ELEKTRONIK GMBH & CO Circuit arrangement for producing an AC voltage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4514596A (en) * 1980-07-17 1985-04-30 Plessey Overseas Limited Telephone handsets
EP0146185A2 (en) * 1983-12-15 1985-06-26 Koninklijke Philips Electronics N.V. Telephone circuit comprising a class-B amplifier
EP0146185A3 (en) * 1983-12-15 1985-07-24 N.V. Philips' Gloeilampenfabrieken Telephone circuit comprising a class-b amplifier
EP0261319A2 (en) * 1986-09-26 1988-03-30 KE KOMMUNIKATIONS-ELEKTRONIK GMBH & CO Circuit arrangement for producing an AC voltage
EP0261319A3 (en) * 1986-09-26 1990-03-07 Kabelmetal Electro Gmbh Circuit arrangement for producing an ac voltage

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