SE9000765L - Anordning vid telekommunikationsanlaeggningar, saerskilt hiss och porttelefonanlaeggningar - Google Patents
Anordning vid telekommunikationsanlaeggningar, saerskilt hiss och porttelefonanlaeggningarInfo
- Publication number
- SE9000765L SE9000765L SE9000765A SE9000765A SE9000765L SE 9000765 L SE9000765 L SE 9000765L SE 9000765 A SE9000765 A SE 9000765A SE 9000765 A SE9000765 A SE 9000765A SE 9000765 L SE9000765 L SE 9000765L
- Authority
- SE
- Sweden
- Prior art keywords
- amplifier
- gate
- output
- coupled
- microphone
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 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)
- Alarm Systems (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9000765A SE9000765L (sv) | 1990-03-05 | 1990-03-05 | Anordning vid telekommunikationsanlaeggningar, saerskilt hiss och porttelefonanlaeggningar |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9000765A SE9000765L (sv) | 1990-03-05 | 1990-03-05 | Anordning vid telekommunikationsanlaeggningar, saerskilt hiss och porttelefonanlaeggningar |
Publications (2)
Publication Number | Publication Date |
---|---|
SE9000765D0 SE9000765D0 (sv) | 1990-03-05 |
SE9000765L true SE9000765L (sv) | 1991-09-06 |
Family
ID=20378759
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9000765A SE9000765L (sv) | 1990-03-05 | 1990-03-05 | Anordning vid telekommunikationsanlaeggningar, saerskilt hiss och porttelefonanlaeggningar |
Country Status (1)
Country | Link |
---|---|
SE (1) | SE9000765L (sv) |
-
1990
- 1990-03-05 SE SE9000765A patent/SE9000765L/sv not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
SE9000765D0 (sv) | 1990-03-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4626630A (en) | Telephone call forwarding device | |
NO990982D0 (no) | Demping av mikrofon i telekommunikasjonssystemer | |
US20030016838A1 (en) | Optical microphone systems and method of operating same | |
SE9000765L (sv) | Anordning vid telekommunikationsanlaeggningar, saerskilt hiss och porttelefonanlaeggningar | |
US4631365A (en) | Intercom system | |
US4445002A (en) | Sidetone circuit | |
US2545478A (en) | Telephone installation using a single line | |
JPS60260280A (ja) | ドアホンカメラシステム | |
KR920000087B1 (ko) | 사설교환기에 있어서 야간 경보장치 | |
JPH034655A (ja) | ドアホン | |
JP2692924B2 (ja) | 電話システム | |
JP2607262B2 (ja) | 電話交換システムの増設ユニット | |
KR960007512Y1 (ko) | 파워 엠프를 이용한 전화 인터페이스 회로 | |
JPS63236427A (ja) | コ−ドレス電話機 | |
JPH1056516A (ja) | 一斉放送装置 | |
JP2001086490A (ja) | テレビインターホン装置 | |
JPH01265642A (ja) | 電話交換システムの増設ユニット | |
JPH0321111Y2 (sv) | ||
JPS62227249A (ja) | ドアホン回路 | |
JPS60163554A (ja) | 電話機用呼出信号電子音メロデイ−変換装置 | |
KR900004467B1 (ko) | 다출력 회로의 단일 스피커 사용회로 | |
JPS6241488Y2 (sv) | ||
KR860001749B1 (ko) | 도어폰 | |
JPS6221097Y2 (sv) | ||
KR0142114B1 (ko) | 플래쉬 표시 장치를 가진 전화기 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
NAV | Patent application has lapsed |
Ref document number: 9000765-9 Effective date: 19921001 |