NL7801820A - SWITCH DEVICE FOR A FREE TALK PHONE. - Google Patents

SWITCH DEVICE FOR A FREE TALK PHONE.

Info

Publication number
NL7801820A
NL7801820A NL7801820A NL7801820A NL7801820A NL 7801820 A NL7801820 A NL 7801820A NL 7801820 A NL7801820 A NL 7801820A NL 7801820 A NL7801820 A NL 7801820A NL 7801820 A NL7801820 A NL 7801820A
Authority
NL
Netherlands
Prior art keywords
switch device
free talk
talk phone
phone
free
Prior art date
Application number
NL7801820A
Other languages
Dutch (nl)
Original Assignee
Dasy Int Sa
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 DE19772751248 external-priority patent/DE2751248C3/en
Priority claimed from DE19772751261 external-priority patent/DE2751261C3/en
Application filed by Dasy Int Sa filed Critical Dasy Int Sa
Publication of NL7801820A publication Critical patent/NL7801820A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
NL7801820A 1977-11-16 1978-02-17 SWITCH DEVICE FOR A FREE TALK PHONE. NL7801820A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19772751248 DE2751248C3 (en) 1977-11-16 1977-11-16 Circuit arrangement for a hands-free telephone
DE19772751261 DE2751261C3 (en) 1977-11-16 1977-11-16 Circuit arrangement for a hands-free telephone with automatic signal amplitude limitation

Publications (1)

Publication Number Publication Date
NL7801820A true NL7801820A (en) 1979-05-18

Family

ID=25773095

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7801820A NL7801820A (en) 1977-11-16 1978-02-17 SWITCH DEVICE FOR A FREE TALK PHONE.

Country Status (10)

Country Link
JP (1) JPS5472906A (en)
CH (1) CH626485A5 (en)
DK (1) DK74878A (en)
FI (1) FI780555A (en)
FR (1) FR2409645A2 (en)
GB (1) GB1568329A (en)
IT (1) IT1161440B (en)
LU (1) LU79026A1 (en)
NL (1) NL7801820A (en)
SE (1) SE7801902L (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8317706D0 (en) * 1983-06-29 1983-08-03 Standard Telephones Cables Ltd Telephone subsets
US4724540A (en) * 1986-09-02 1988-02-09 Motorola, Inc. Speakerphone with fast idle mode
JPH06338934A (en) * 1993-05-25 1994-12-06 Exar Corp Speaker horn with phenomenon driving type control circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051325A (en) * 1975-01-31 1977-09-27 Matsushita Electric Industrial Co., Ltd. Speech intercommunication system
DE2638286C3 (en) * 1976-08-25 1979-03-01 Dasy Inter S.A., Genf (Schweiz) Circuit arrangement for a hands-free telephone

Also Published As

Publication number Publication date
IT7812485A0 (en) 1978-02-20
GB1568329A (en) 1980-05-29
FR2409645A2 (en) 1979-06-15
LU79026A1 (en) 1978-06-21
FI780555A (en) 1979-05-17
DK74878A (en) 1979-05-17
SE7801902L (en) 1979-05-17
IT1161440B (en) 1987-03-18
JPS5472906A (en) 1979-06-11
CH626485A5 (en) 1981-11-13

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Legal Events

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A1A A request for search or an international-type search has been filed
BB A search report has been drawn up
BC A request for examination has been filed
BV The patent application has lapsed