JPS6271955U - - Google Patents
Info
- Publication number
- JPS6271955U JPS6271955U JP16316985U JP16316985U JPS6271955U JP S6271955 U JPS6271955 U JP S6271955U JP 16316985 U JP16316985 U JP 16316985U JP 16316985 U JP16316985 U JP 16316985U JP S6271955 U JPS6271955 U JP S6271955U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- telephone
- calling
- output
- 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
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Description
第１図は本考案の屋内回線呼出し回路の一実施
例における電話機の構成ブロツク図、第２図は本
考案の屋内回線呼出し回路の一実施例における全
体のブロツク図である。
主な図番の説明、１……第１電話機、２……第
２電話機、３……第３電話機、５……信号発生送
信回路、６……信号受信回路、１８……第２直流
インピーダンス回路、２０……信号識別回路、２
１……ラツチ回路。
FIG. 1 is a block diagram of the construction of a telephone in an embodiment of the indoor line paging circuit of the present invention, and FIG. 2 is an overall block diagram of an embodiment of the indoor line paging circuit of the present invention. Explanation of main drawing numbers, 1 ...First telephone, 2 ...Second telephone, 3 ...Third telephone, 5 ...Signal generation and transmission circuit, 6 ...Signal reception circuit, 18...Second DC impedance Circuit, 20...Signal identification circuit, 2
1...Latch circuit.
Claims (1)
機において、第１電話機には少なくとも呼出用の
ブランチコールスイツチと、該ブラスチコールス
イツチにより起動しコード化されたパルス信号を
出力するパルス信号発生回路と、該パルス信号発
生回路の出力に対応し電話回線間電圧を変化させ
る直流インピーダンス回路とを備え、第２電話機
には少なくとも電話回線間電圧の変化を検出する
電圧検出回路と、該電圧検出回路より出力される
検出信号を識別する信号識別回路と、該信号識別
回路の出力に対応して一定信号を発生させるラツ
チ回路と、該ラツチ回路の一定信号を呼び出し信
号に変換する呼出し信号発生回路とを備え、通話
中の第１電話機のブランチコールスイツチを操作
することにより第２電話機を呼出せることを特徴
とする屋内回線呼出し回路。 In the first and second telephones connected in parallel to the same line, the first telephone includes at least a branch call switch for calling, and a pulse signal generator activated by the branch call switch to output a coded pulse signal. circuit, and a DC impedance circuit that changes the telephone line voltage in response to the output of the pulse signal generating circuit, and the second telephone includes a voltage detection circuit that detects at least a change in the telephone line voltage; A signal identification circuit that identifies a detection signal output from the circuit, a latch circuit that generates a constant signal in response to the output of the signal identification circuit, and a calling signal generation circuit that converts the constant signal of the latch circuit into a calling signal. An indoor line calling circuit characterized in that a second telephone can be called by operating a branch call switch of a first telephone during a call.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16316985U JPS6271955U (en) | 1985-10-24 | 1985-10-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16316985U JPS6271955U (en) | 1985-10-24 | 1985-10-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6271955U true JPS6271955U (en) | 1987-05-08 |
Family
ID=31091120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16316985U Pending JPS6271955U (en) | 1985-10-24 | 1985-10-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6271955U (en) |
-
1985
- 1985-10-24 JP JP16316985U patent/JPS6271955U/ja active Pending