JPH0193863U - - Google Patents
Info
- Publication number
- JPH0193863U JPH0193863U JP18995087U JP18995087U JPH0193863U JP H0193863 U JPH0193863 U JP H0193863U JP 18995087 U JP18995087 U JP 18995087U JP 18995087 U JP18995087 U JP 18995087U JP H0193863 U JPH0193863 U JP H0193863U
- Authority
- JP
- Japan
- Prior art keywords
- base unit
- doorphone
- input
- interface device
- audio
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 230000002265 prevention Effects 0.000 claims description 2
- 230000005236 sound signal Effects 0.000 claims 3
- 230000003321 amplification Effects 0.000 claims 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
第１図は本考案に係るドアホン用防側音装置の
回路図、第２図は従来のドアホン・インタフエイ
ス装置の回路図である。
図において１Ａ，１Ｂはドアホン親機側信号入
出力端子、２Ａ，２Ｂはドアホン子機側信号入出
力端子、３Ａ，３Ｂはハイブリツトトランス、４
Ａ，４Ｂは平衡回路網、５Ａ，５Ｂ′は増幅器、
５Ｂは可変利得増幅器、６Ａ，６Ｂは整合用抵抗
器、７は音声検出器である。
FIG. 1 is a circuit diagram of a side sound prevention device for a door phone according to the present invention, and FIG. 2 is a circuit diagram of a conventional door phone interface device. In the figure, 1A and 1B are signal input/output terminals on the doorphone base unit side, 2A and 2B are signal input/output terminals on the doorphone slave unit side, 3A and 3B are hybrid transformers, and 4
A and 4B are balanced circuit networks, 5A and 5B' are amplifiers,
5B is a variable gain amplifier, 6A and 6B are matching resistors, and 7 is a voice detector.
Claims (1)
向に伝達させるインタフエイス装置において、 前記インタフエイス装置とドアホン親機側及び
ドアホン子機側との回路をそれぞれ整合させるた
めの整合用抵抗器と、 前記ドアホン親機側から音声信号が入力された
ことを検出する音声検出器と、 前記ドアホン子機から入力される音声信号は所
要の増幅利得により増幅するとともに、前記音声
検出器が音声入力を検出したときに出力する制御
信号によつて増幅利得が減少する可変増幅器とを
備えたことを特徴とするドアホン用防側音装置。[Scope of Claim for Utility Model Registration] An interface device that bidirectionally transmits audio signals between a doorphone base unit and a handset, which includes a circuit between the interface device and the doorphone base unit and doorphone slave unit. A matching resistor for matching, an audio detector for detecting that an audio signal is input from the door intercom base unit, and amplifying the audio signal input from the door intercom slave unit by a required amplification gain. A side sound prevention device for a door phone, further comprising: a variable amplifier whose amplification gain is reduced by a control signal output when the voice detector detects voice input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18995087U JPH0193863U (en) | 1987-12-16 | 1987-12-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18995087U JPH0193863U (en) | 1987-12-16 | 1987-12-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0193863U true JPH0193863U (en) | 1989-06-20 |
Family
ID=31480956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18995087U Pending JPH0193863U (en) | 1987-12-16 | 1987-12-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0193863U (en) |
-
1987
- 1987-12-16 JP JP18995087U patent/JPH0193863U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0193863U (en) | ||
| JPS61264891A (en) | Key telephone set | |
| JPS6142164U (en) | Pre-talk intercom device | |
| JPS61168747U (en) | ||
| JPH01139657U (en) | ||
| JPS62183451U (en) | ||
| JPH0464848U (en) | ||
| JPS59180552U (en) | Simultaneous call type handset/receiver | |
| JPS625766U (en) | ||
| JPS59193055U (en) | Telephone transmitter circuit | |
| JPS62119043U (en) | ||
| JPS60153018U (en) | automatic volume adjustment circuit | |
| JPH01119244U (en) | ||
| JPH01126622U (en) | ||
| JPS63147054U (en) | ||
| JPS6388308U (en) | ||
| JPH04135356A (en) | Doorphone slave unit | |
| JPH04121135U (en) | Transceiver device with press talk function | |
| JPH0260353U (en) | ||
| JPS59137663U (en) | Handset with controls for telephones, etc. | |
| JPH03115950U (en) | ||
| JPS63152298A (en) | Trunk line interface circuit for pushbutton telephone set | |
| JPH04183151A (en) | External speaker connecting method for key telephone set | |
| JPH07121037B2 (en) | Intercom system | |
| JPH04121137U (en) | car phone equipment |