DK74878A - CIRCUIT TO A SPEAKER PHONE - Google Patents
CIRCUIT TO A SPEAKER PHONEInfo
- Publication number
- DK74878A DK74878A DK74878A DK74878A DK74878A DK 74878 A DK74878 A DK 74878A DK 74878 A DK74878 A DK 74878A DK 74878 A DK74878 A DK 74878A DK 74878 A DK74878 A DK 74878A
- Authority
- DK
- Denmark
- Prior art keywords
- circuit
- speaker phone
- speaker
- phone
- Prior art date
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)
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 |
---|---|
DK74878A true DK74878A (en) | 1979-05-17 |
Family
ID=25773095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK74878A DK74878A (en) | 1977-11-16 | 1978-02-20 | CIRCUIT TO A SPEAKER 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)
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)
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 |
-
1978
- 1978-02-08 LU LU79026A patent/LU79026A1/en unknown
- 1978-02-16 GB GB6251/78A patent/GB1568329A/en not_active Expired
- 1978-02-16 FR FR7804396A patent/FR2409645A2/en active Pending
- 1978-02-17 NL NL7801820A patent/NL7801820A/en not_active Application Discontinuation
- 1978-02-20 FI FI780555A patent/FI780555A/en unknown
- 1978-02-20 SE SE7801902A patent/SE7801902L/en unknown
- 1978-02-20 IT IT12485/78A patent/IT1161440B/en active
- 1978-02-20 DK DK74878A patent/DK74878A/en not_active Application Discontinuation
- 1978-02-20 CH CH182478A patent/CH626485A5/en not_active IP Right Cessation
- 1978-02-20 JP JP1840878A patent/JPS5472906A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
JPS5472906A (en) | 1979-06-11 |
NL7801820A (en) | 1979-05-18 |
IT1161440B (en) | 1987-03-18 |
SE7801902L (en) | 1979-05-17 |
CH626485A5 (en) | 1981-11-13 |
GB1568329A (en) | 1980-05-29 |
FR2409645A2 (en) | 1979-06-15 |
LU79026A1 (en) | 1978-06-21 |
FI780555A (en) | 1979-05-17 |
IT7812485A0 (en) | 1978-02-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AHS | Application shelved for other reasons than non-payment |