JPH0216650U - - Google Patents
Info
- Publication number
- JPH0216650U JPH0216650U JP1988095092U JP9509288U JPH0216650U JP H0216650 U JPH0216650 U JP H0216650U JP 1988095092 U JP1988095092 U JP 1988095092U JP 9509288 U JP9509288 U JP 9509288U JP H0216650 U JPH0216650 U JP H0216650U
- Authority
- JP
- Japan
- Prior art keywords
- control signal
- circuit
- outputs
- communication line
- automatic gain
- 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
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 2
- 230000001934 delay Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Maintenance And Management Of Digital Transmission (AREA)
Description
第１図は本考案によるデータ伝送用変復装置の
一実施例を示すブロツク図、第２図は従来のデー
タ伝送用変復調装置の一例を示すブロツク図であ
る。
１……入力端子、２……出力端子、３……伝送
路、４……送信器、５……受信器、６……スピー
カ、７，８……中継トランス、９……受話回路、
１０，１１，１２，１００，１０２，１０３……
切替器、１３……自動利得制御回路、１４……増
幅器、１０４……キヤリア検出回路。
FIG. 1 is a block diagram showing an embodiment of a data transmission modem according to the present invention, and FIG. 2 is a block diagram showing an example of a conventional data transmission modem. 1... Input terminal, 2... Output terminal, 3... Transmission line, 4... Transmitter, 5... Receiver, 6... Speaker, 7, 8... Relay transformer, 9... Receiving circuit,
10, 11, 12, 100, 102, 103...
Switching device, 13... automatic gain control circuit, 14... amplifier, 104... carrier detection circuit.
Claims (1)
ータ伝送を行うデータ伝送用変復調装置において
、 前記公衆通信回線からの網制御信号のレベルを
調整する自動利得制御回路と、 前記公衆通信回線からの信号が所定のレベル以
上のとき制御信号を出力するキヤリア検出回路と
、 前記制御信号を所定の時間だけ遅延させて出力
する遅延回路と、 この遅延回路が前記制御信号を出力したときオ
ンし、前記自動利得制御回路からの前記網制御信
号をスピーカに与える切替器とを備えたことを特
徴とするデータ伝送用変復調装置。[Claims for Utility Model Registration] A data transmission modulator/demodulator that is equipped with an automatic transmission function and transmits data through a public communication line, comprising: an automatic gain control circuit that adjusts the level of a network control signal from the public communication line; a carrier detection circuit that outputs a control signal when a signal from a public communication line is at a predetermined level or higher; a delay circuit that delays the control signal by a predetermined time and outputs the control signal; and the delay circuit outputs the control signal. 2. A data transmission modulation/demodulation device comprising: a switch that is turned on when the automatic gain control circuit is turned on to supply the network control signal from the automatic gain control circuit to a speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988095092U JPH0216650U (en) | 1988-07-20 | 1988-07-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988095092U JPH0216650U (en) | 1988-07-20 | 1988-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0216650U true JPH0216650U (en) | 1990-02-02 |
Family
ID=31319710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988095092U Pending JPH0216650U (en) | 1988-07-20 | 1988-07-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0216650U (en) |
-
1988
- 1988-07-20 JP JP1988095092U patent/JPH0216650U/ja active Pending
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