NO784143L - Koblingsanordning for porttelefonanlegg - Google Patents
Koblingsanordning for porttelefonanleggInfo
- Publication number
- NO784143L NO784143L NO784143A NO784143A NO784143L NO 784143 L NO784143 L NO 784143L NO 784143 A NO784143 A NO 784143A NO 784143 A NO784143 A NO 784143A NO 784143 L NO784143 L NO 784143L
- Authority
- NO
- Norway
- Prior art keywords
- microphone
- speech
- door
- button
- speaker
- Prior art date
Links
- 239000003610 charcoal Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 230000004913 activation Effects 0.000 claims 1
- 230000000284 resting effect Effects 0.000 claims 1
- 239000004020 conductor Substances 0.000 description 53
- 239000003990 capacitor Substances 0.000 description 23
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
- H04M11/025—Door telephones
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2756276A DE2756276C3 (de) | 1977-12-16 | 1977-12-16 | Schaltungsanordnung für eine Ruf-, Türsprech- und Türöffneranlage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO784143L true NO784143L (no) | 1979-06-19 |
Family
ID=6026379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO784143A NO784143L (no) | 1977-12-16 | 1978-12-08 | Koblingsanordning for porttelefonanlegg |
Country Status (14)
| Country | Link |
|---|---|
| BE (1) | BE872780A (de) |
| DE (1) | DE2756276C3 (de) |
| DK (1) | DK535478A (de) |
| ES (1) | ES475995A1 (de) |
| FI (1) | FI783834A (de) |
| FR (1) | FR2412126B3 (de) |
| GB (1) | GB2010642B (de) |
| IS (1) | IS2466A7 (de) |
| IT (1) | IT1101562B (de) |
| LU (1) | LU80652A1 (de) |
| NL (1) | NL7812007A (de) |
| NO (1) | NO784143L (de) |
| PT (1) | PT68875A (de) |
| SE (1) | SE7812671L (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1110111B (it) * | 1979-01-12 | 1985-12-23 | Acet Srl | Impianto citofonico a portiere elettrico a due fili,suscettibile di utilizzare un pressistente impianto a campanello,senza necessita' di ulteriori linee di alimentazione |
| DE4130101C1 (en) * | 1991-09-11 | 1993-02-04 | Ritto-Werk Loh Gmbh & Co Kg, 6342 Haiger, De | Door intercom with door-opening button - centrally generates call signal and feeds to individual internal intercoms using circuit including two series-connected Zener diodes and parallel decoupling diode |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2113710A5 (de) * | 1970-11-10 | 1972-06-23 | Citovox |
-
1977
- 1977-12-16 DE DE2756276A patent/DE2756276C3/de not_active Expired
-
1978
- 1978-11-24 IS IS2466A patent/IS2466A7/is unknown
- 1978-11-29 DK DK535478A patent/DK535478A/da unknown
- 1978-11-30 GB GB7846655A patent/GB2010642B/en not_active Expired
- 1978-12-05 PT PT68875A patent/PT68875A/pt unknown
- 1978-12-08 NO NO784143A patent/NO784143L/no unknown
- 1978-12-08 NL NL7812007A patent/NL7812007A/xx not_active Application Discontinuation
- 1978-12-08 SE SE7812671A patent/SE7812671L/xx unknown
- 1978-12-13 LU LU80652A patent/LU80652A1/de unknown
- 1978-12-13 FI FI783834A patent/FI783834A/fi unknown
- 1978-12-14 IT IT30842/78A patent/IT1101562B/it active
- 1978-12-14 ES ES475995A patent/ES475995A1/es not_active Expired
- 1978-12-15 FR FR7835472A patent/FR2412126B3/fr not_active Expired
- 1978-12-15 BE BE2057492A patent/BE872780A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL7812007A (nl) | 1979-06-19 |
| GB2010642B (en) | 1982-01-20 |
| ES475995A1 (es) | 1979-04-16 |
| BE872780A (nl) | 1979-03-30 |
| DK535478A (da) | 1979-06-17 |
| DE2756276B2 (de) | 1979-10-11 |
| IS2466A7 (is) | 1978-11-24 |
| PT68875A (pt) | 1979-01-01 |
| FR2412126A1 (de) | 1979-07-13 |
| IT1101562B (it) | 1985-10-07 |
| SE7812671L (sv) | 1979-06-17 |
| DE2756276C3 (de) | 1982-08-12 |
| FR2412126B3 (de) | 1981-10-16 |
| GB2010642A (en) | 1979-06-27 |
| FI783834A (fi) | 1979-06-17 |
| LU80652A1 (de) | 1979-04-13 |
| DE2756276A1 (de) | 1979-06-21 |
| IT7830842A0 (it) | 1978-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1065072A (en) | Loudspeaking teleconferencing circuit | |
| US4554411A (en) | Intercom system | |
| US4088846A (en) | Hold-plus-intercom for single-line stations | |
| US3904834A (en) | Handsfree loudspeaking key telephone set and a switching circuit for use in a microphone and loudspeaker equipped key telephone | |
| US3872262A (en) | Key telephone system | |
| US2801287A (en) | Control of regular and distant talking subscribers sets | |
| NO784143L (no) | Koblingsanordning for porttelefonanlegg | |
| US3965308A (en) | Line card circuit | |
| US3894197A (en) | Audio frequency signalling systems for telephone systems | |
| US5386463A (en) | Low noise multi-elevator communication system and method | |
| US3870819A (en) | Conference call apparatus for use with key telephone system equipment | |
| US1567209A (en) | Subscriber s equipment for program transmission | |
| US1013865A (en) | Telephone system. | |
| JP3390887B2 (ja) | 異なる電話回線を収容する電話機同志の内線通話回路 | |
| JPH0311984Y2 (de) | ||
| KR0135656B1 (ko) | 간이형 교환기의 도아폰 접속회로에 있어 전기적 하울링 방지 방법 | |
| US682152A (en) | Telephone-exchange apparatus. | |
| JP2000278426A (ja) | 集合住宅用インターホン、及びこのインターホンを用いた集合住宅用インターホンシステム | |
| US2425187A (en) | Intercommunicating system | |
| KR100697724B1 (ko) | 통화연결장치 | |
| KR930002581B1 (ko) | 무선 전화기의 인터컴 통화회로 | |
| JPH01143551A (ja) | インターホン装置 | |
| JPS60200677A (ja) | 保留音送出機能付電話機回路 | |
| JPS6147023B2 (de) | ||
| JPS61140261A (ja) | 電話装置 |