JPS61128858U - - Google Patents
Info
- Publication number
- JPS61128858U JPS61128858U JP1127185U JP1127185U JPS61128858U JP S61128858 U JPS61128858 U JP S61128858U JP 1127185 U JP1127185 U JP 1127185U JP 1127185 U JP1127185 U JP 1127185U JP S61128858 U JPS61128858 U JP S61128858U
- Authority
- JP
- Japan
- Prior art keywords
- period
- hook
- back tone
- during
- ring back
- 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
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Telephone Set Structure (AREA)
Description
第1図は本考案の一実施例の構成を示すブロツ
ク図、第2図は本考案の一実施例における制御回
路の一例を示す回路図、第3図は本考案の一実施
例の作用の説明に供する波形図である。
1……復調器、2……オーデイオ増幅器、3…
…スピーカ、4……リング・バツク・トーン(R
BT)検出回路、5……制御回路、6……マイク
ロホン、7……マイク増幅器、8……変調器、9
……送信回路、10……サイリスタ、11……オ
フフツクスイツチ、12,13および14……ト
ランジスタ。
Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention, Fig. 2 is a circuit diagram showing an example of a control circuit in an embodiment of the invention, and Fig. 3 shows the operation of an embodiment of the invention. It is a waveform diagram provided for explanation. 1...Demodulator, 2...Audio amplifier, 3...
...Speaker, 4...Ring back tone (R
BT) detection circuit, 5... control circuit, 6... microphone, 7... microphone amplifier, 8... modulator, 9
...Transmission circuit, 10...Thyristor, 11...Off switch, 12, 13 and 14...Transistor.
Claims (1)
リング・バツク・トーン信号を検出したときから
オンフツクするまでの期間以外においてマイクロ
ホン出力をミユートするようにしてなることを特
徴とする電話回線接続通信機。 A telephone line-connected communication device, characterized in that the microphone output is muted during a period other than the period from when a ring back tone signal is detected during off-hook until on-hook.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1127185U JPS61128858U (en) | 1985-01-31 | 1985-01-31 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1127185U JPS61128858U (en) | 1985-01-31 | 1985-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61128858U true JPS61128858U (en) | 1986-08-12 |
Family
ID=30493238
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1127185U Pending JPS61128858U (en) | 1985-01-31 | 1985-01-31 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61128858U (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62159952A (en) * | 1986-01-09 | 1987-07-15 | Matsushita Electric Ind Co Ltd | Telephone terminal equipment |
JPS643354U (en) * | 1987-06-25 | 1989-01-10 | ||
JPH0221847U (en) * | 1988-07-15 | 1990-02-14 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5787656A (en) * | 1980-11-21 | 1982-06-01 | Nippon Telegr & Teleph Corp <Ntt> | Loudspeaker transmitting system |
-
1985
- 1985-01-31 JP JP1127185U patent/JPS61128858U/ja active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5787656A (en) * | 1980-11-21 | 1982-06-01 | Nippon Telegr & Teleph Corp <Ntt> | Loudspeaker transmitting system |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62159952A (en) * | 1986-01-09 | 1987-07-15 | Matsushita Electric Ind Co Ltd | Telephone terminal equipment |
JPS643354U (en) * | 1987-06-25 | 1989-01-10 | ||
JPH0221847U (en) * | 1988-07-15 | 1990-02-14 |
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