IT1161440B - CIRCUIT FOR A FREE DIALOG PHONE - Google Patents

CIRCUIT FOR A FREE DIALOG PHONE

Info

Publication number
IT1161440B
IT1161440B IT12485/78A IT1248578A IT1161440B IT 1161440 B IT1161440 B IT 1161440B IT 12485/78 A IT12485/78 A IT 12485/78A IT 1248578 A IT1248578 A IT 1248578A IT 1161440 B IT1161440 B IT 1161440B
Authority
IT
Italy
Prior art keywords
phone
circuit
dialog
free
free dialog
Prior art date
Application number
IT12485/78A
Other languages
Italian (it)
Other versions
IT7812485A0 (en
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 DE19772751261 external-priority patent/DE2751261C3/en
Priority claimed from DE19772751248 external-priority patent/DE2751248C3/en
Application filed by Dasy Int Sa filed Critical Dasy Int Sa
Publication of IT7812485A0 publication Critical patent/IT7812485A0/en
Application granted granted Critical
Publication of IT1161440B publication Critical patent/IT1161440B/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
IT12485/78A 1977-11-16 1978-02-20 CIRCUIT FOR A FREE DIALOG PHONE IT1161440B (en)

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
IT7812485A0 IT7812485A0 (en) 1978-02-20
IT1161440B true IT1161440B (en) 1987-03-18

Family

ID=25773095

Family Applications (1)

Application Number Title Priority Date Filing Date
IT12485/78A IT1161440B (en) 1977-11-16 1978-02-20 CIRCUIT FOR A FREE DIALOG 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
JPS5472906A (en) 1979-06-11
FR2409645A2 (en) 1979-06-15
SE7801902L (en) 1979-05-17
LU79026A1 (en) 1978-06-21
CH626485A5 (en) 1981-11-13
DK74878A (en) 1979-05-17
NL7801820A (en) 1979-05-18
GB1568329A (en) 1980-05-29
FI780555A (en) 1979-05-17
IT7812485A0 (en) 1978-02-20

Similar Documents

Publication Publication Date Title
DK155485C (en) A mower-conditioning
PL205461A1 (en) A WORMHOUSE
PL210379A1 (en) A WORMHOUSE
IT1100112B (en) ELECTRONIC SPOOL
IT1082614B (en) CIRCUIT FOR A FREE DIALOG PHONE
ES237667Y (en) A TELESCOPIC SPRING
SE7905299L (en) CALL DRAWING DEVICE
IT1098820B (en) BRUSH DEVICE
IT1083388B (en) ELECTRONIC RINGTONE FOR TELEPHONE DEVICES
NO150300C (en) PHONE ADAPTER
PL208435A1 (en) A WORMHOUSE
IT1059923B (en) PREPAID TELEPHONE EQUIPMENT WITH MICROCALCULATOR
PL207767A1 (en) A WORMHOUSE
PL210032A1 (en) A WORMHOUSE
PL204307A1 (en) A WORMHOUSE
IT1192589B (en) ALOCTINA A
IT1161440B (en) CIRCUIT FOR A FREE DIALOG PHONE
FR2405602B1 (en) PREPAYMENT TELEPHONE
SE7800213L (en) TELEPHONE
PL207194A1 (en) A WORMHOUSE
IT1099515B (en) FIXING DEVICE FOR A TELEPHONE DEVICE
PL106564B1 (en) A WORMHOUSE
IT7852964V0 (en) UBRICA CARDS PARTICULARLY FOR TELEPHONE USERS
PL196967A1 (en) A TELEPHONE
SE7707799L (en) TELEPHONE