JPS6055153U - Transportable simultaneous call intercom - Google Patents
Transportable simultaneous call intercomInfo
- Publication number
- JPS6055153U JPS6055153U JP14500683U JP14500683U JPS6055153U JP S6055153 U JPS6055153 U JP S6055153U JP 14500683 U JP14500683 U JP 14500683U JP 14500683 U JP14500683 U JP 14500683U JP S6055153 U JPS6055153 U JP S6055153U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- carrier wave
- carrier
- receiving
- simultaneous call
- 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
Landscapes
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図、第２図はそれぞれ従来の搬送式同時通話インタ
ーホンの通話方式を示すブロック図、第３図は本考案の
一実施例の搬送式同時通話インターホンの周波数切換え
回路を示すブロック図、第４図は本考案の搬送式同時通
話インターホンの待期状態を示す説明図、第５図は本考
案の搬送式同時通話インターホンの呼出しの状態を示す
説明図、第６図は第３図のスイッチング回路と送信機側
機器の要部の一具体例回路図を示す。
４・・・搬送波Ａ検出回路、５・・・スイッチングトラ
ンジスタ、６・・・ＡＮＤ回路、７・・・送話機スイッ
チ、８・・・スイッチング回路、９・・・受信機側機器
、１０・・・送信機側機器、１１・・・Ｄ局、１２・・
・Ｅ局、１３・・・Ｆ局、１４・・・送、受信制御回路
、１５・・・伝送線路。1 and 2 are block diagrams showing the communication system of a conventional carrier-type simultaneous call intercom, respectively. FIG. 3 is a block diagram showing a frequency switching circuit of a carrier-type simultaneous call intercom according to an embodiment of the present invention. Figure 4 is an explanatory diagram showing the standby state of the carrier-type simultaneous call intercom of the present invention, Figure 5 is an explanatory diagram showing the calling state of the carrier-type simultaneous call intercom of the present invention, and Figure 6 is the switching diagram of Figure 3. A specific example circuit diagram of the main parts of the circuit and transmitter side equipment is shown. 4... Carrier wave A detection circuit, 5... Switching transistor, 6... AND circuit, 7... Transmitter switch, 8... Switching circuit, 9... Receiver side equipment, 10...・Transmitter side equipment, 11...D station, 12...
-E station, 13...F station, 14...transmission and reception control circuit, 15...transmission line.
Claims (1)
搬送波を重畳させて信号伝送を行ない、発信側、受信側
機器で同時に通話を行なう搬送式インターホンに於いて
、第１の周波数を有する搬送波の検出手段、第１の周波
数と第２の周波数の搬送波を発生する手段第・２の周波
数と第１の周波数の搬送波を受信する手段、および前記
検出手段によって前記第１の周波数の搬送波が検出され
た時、第２の周波数の搬送波を発生する手段と第１の周
波数の搬送波を受信する手段を選択し、前記検出手段に
よって前記第１の周波数の搬送波が検出されていない時
には、前記第１の周波数の搬送波を発生する手段と第２
の搬送波を受信する手段とを選択するスイッチング手段
を具備したことを特徴とする搬送式同時通話インターホ
ン。In a carrier-type intercom, which transmits signals by superimposing a carrier wave different from the frequency of the signal to be transmitted onto the existing transmission line, and allows simultaneous communication between the transmitting and receiving devices, the carrier wave having the first frequency is used. means for generating carrier waves of a first frequency and a second frequency; means for receiving carrier waves of a second frequency and a first frequency; and a carrier wave of the first frequency is detected by the detection means. when the carrier wave of the second frequency is detected and the means for receiving the carrier wave of the first frequency are selected, and when the carrier wave of the first frequency is not detected by the detection means, the carrier wave of the first frequency is selected. means for generating a carrier wave of a frequency of
1. A carrier-type simultaneous call intercom characterized in that it is equipped with a means for receiving a carrier wave and a switching means for selecting a means for receiving a carrier wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14500683U JPS6055153U (en) | 1983-09-21 | 1983-09-21 | Transportable simultaneous call intercom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14500683U JPS6055153U (en) | 1983-09-21 | 1983-09-21 | Transportable simultaneous call intercom |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6055153U true JPS6055153U (en) | 1985-04-18 |
Family
ID=30323207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14500683U Pending JPS6055153U (en) | 1983-09-21 | 1983-09-21 | Transportable simultaneous call intercom |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6055153U (en) |
-
1983
- 1983-09-21 JP JP14500683U patent/JPS6055153U/en active Pending
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