AU623488B2 - Telephone subset loudspeaker amplifier i.c. protection circuit - Google Patents

Telephone subset loudspeaker amplifier i.c. protection circuit

Info

Publication number
AU623488B2
AU623488B2 AU49305/90A AU4930590A AU623488B2 AU 623488 B2 AU623488 B2 AU 623488B2 AU 49305/90 A AU49305/90 A AU 49305/90A AU 4930590 A AU4930590 A AU 4930590A AU 623488 B2 AU623488 B2 AU 623488B2
Authority
AU
Australia
Prior art keywords
protection circuit
telephone subset
loudspeaker amplifier
loudspeaker
amplifier
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.)
Ceased
Application number
AU49305/90A
Other versions
AU4930590A (en
Inventor
Ronald Christopher Shaw Fox
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.)
Nokia Services Ltd
Original Assignee
Alcatel Australia 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 Alcatel Australia Ltd filed Critical Alcatel Australia Ltd
Publication of AU4930590A publication Critical patent/AU4930590A/en
Assigned to ALCATEL AUSTRALIA LIMITED reassignment ALCATEL AUSTRALIA LIMITED Amend patent request/document other than specification (104) Assignors: STANDARD TELEPHONES AND CABLES PTY. LIMITED
Application granted granted Critical
Publication of AU623488B2 publication Critical patent/AU623488B2/en
Anticipated expiration legal-status Critical
Ceased 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
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
AU49305/90A 1989-02-23 1990-02-12 Telephone subset loudspeaker amplifier i.c. protection circuit Ceased AU623488B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPJ2866 1989-02-23
AUPJ286689 1990-02-12

Publications (2)

Publication Number Publication Date
AU4930590A AU4930590A (en) 1990-08-30
AU623488B2 true AU623488B2 (en) 1992-05-14

Family

ID=3773730

Family Applications (1)

Application Number Title Priority Date Filing Date
AU49305/90A Ceased AU623488B2 (en) 1989-02-23 1990-02-12 Telephone subset loudspeaker amplifier i.c. protection circuit

Country Status (1)

Country Link
AU (1) AU623488B2 (en)

Also Published As

Publication number Publication date
AU4930590A (en) 1990-08-30

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Legal Events

Date Code Title Description
MK14 Patent ceased section 143(a) (annual fees not paid) or expired