GB1366167A - Acoustic signal devices in telecommunications systems - Google Patents

Acoustic signal devices in telecommunications systems

Info

Publication number
GB1366167A
GB1366167A GB4640471A GB4640471A GB1366167A GB 1366167 A GB1366167 A GB 1366167A GB 4640471 A GB4640471 A GB 4640471A GB 4640471 A GB4640471 A GB 4640471A GB 1366167 A GB1366167 A GB 1366167A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
piezo
acoustic
electric element
oct
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
GB4640471A
Other languages
English (en)
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.)
Siemens AG
Original Assignee
Siemens AG
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
Priority claimed from DE19702049346 external-priority patent/DE2049346C3/de
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1366167A publication Critical patent/GB1366167A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
GB4640471A 1970-10-07 1971-10-06 Acoustic signal devices in telecommunications systems Expired GB1366167A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702049346 DE2049346C3 (de) 1970-10-07 Schaltungsanordnung zur Erzeugung eines akustischen Rufsignals für Endstellen in Fernmelde-, insbesondere Fernsprechanlagen mittels einer Schwingschaltung

Publications (1)

Publication Number Publication Date
GB1366167A true GB1366167A (en) 1974-09-11

Family

ID=5784495

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4640471A Expired GB1366167A (en) 1970-10-07 1971-10-06 Acoustic signal devices in telecommunications systems

Country Status (8)

Country Link
AT (1) AT311432B (nl)
BE (1) BE773617A (nl)
CH (1) CH543204A (nl)
FR (1) FR2110265B1 (nl)
GB (1) GB1366167A (nl)
LU (1) LU64012A1 (nl)
NL (1) NL156882B (nl)
SE (1) SE371920B (nl)

Also Published As

Publication number Publication date
DE2049346B2 (de) 1974-01-31
LU64012A1 (nl) 1972-04-12
AT311432B (de) 1973-11-12
DE2049346A1 (de) 1972-04-13
NL7113728A (nl) 1972-04-11
SE371920B (nl) 1974-12-02
FR2110265B1 (nl) 1975-02-07
FR2110265A1 (nl) 1972-06-02
NL156882B (nl) 1978-05-16
CH543204A (de) 1973-10-15
BE773617A (fr) 1972-04-07

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee