JPH0127621B2 - - Google Patents
Info
- Publication number
- JPH0127621B2 JPH0127621B2 JP57128115A JP12811582A JPH0127621B2 JP H0127621 B2 JPH0127621 B2 JP H0127621B2 JP 57128115 A JP57128115 A JP 57128115A JP 12811582 A JP12811582 A JP 12811582A JP H0127621 B2 JPH0127621 B2 JP H0127621B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- gate
- detection circuit
- signal detection
- logical
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
【発明の詳細な説明】
本発明は、電力線を通話線路として使用する搬
送式インターホンに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carrier type intercom that uses a power line as a communication line.
従来の電力線搬送式のインターホンの通話は双
方でのプレストーク方式を採用しているため、一
方が送話状態で、無変調時などに、他方の受話側
で相手が送話中であることに気づかず送信して双
方が同時送話状態になり、意志伝達が出来ない場
合がある。また監視する目的で設置された装置
が、送信状態にセツトされているため、監視側か
ら送信することが出来ない等の欠点がある。 Conventional power line carrier intercom calls use a press-talk method for both parties, so when one party is transmitting and there is no modulation, it is possible for the other party to hear that the other party is transmitting. If you send a message without realizing it, both parties may end up talking at the same time, and you may not be able to communicate your intentions. Furthermore, since the device installed for the purpose of monitoring is set to a transmitting state, there is a drawback that it is impossible to transmit from the monitoring side.
本発明は、前記した欠点を除去し、自動的に送
受切換を行ない通話操作を簡略化することを目的
としたものである。 SUMMARY OF THE INVENTION The present invention aims to eliminate the above-mentioned drawbacks and simplify call operations by automatically switching between transmitting and receiving.
以下その実施例とともに説明する。第１図は、
電力線ｌに１対の電力線搬送インターホン（以下
インターホンと呼ぶ）I1およびI2がそれぞれ電源
コードプラグ１および１′を通じて接続されてお
り、インターホンI1が受信状態にある。１は電力
線ｌへ接続するための電源コードプラグ、２及び
３は、搬送波信号を電力線に重畳するための結合
コンデンサ、４は電源トランス、５は各回路へ駆
動電力を供給するための直流安定化電源回路、６
は搬送波信号のみを通過させる帯域フイルタ、７
は復調回路、８は搬送波信号検出回路、９は変調
回路、１０，１１は音声信号増幅回路、１２は音
声信号検出回路、１３は送信および受信を自動的
に切換えるために必要な発振回路、１４は論理
ORゲート、１５は論理ANDゲート、１６は
NPN形トランジスタ、１７はリレー、１８はマ
イク兼用のスピーカ、１９，２０はリレー１７に
よつて制御される送受切換スイツチ、２１は音声
信号検出回路１２へ送る信号のON―OFFスイツ
チである。 This will be explained below along with examples. Figure 1 shows
A pair of power line carrier intercoms (hereinafter referred to as intercoms) I 1 and I 2 are connected to the power line l through power cord plugs 1 and 1', respectively, and the intercom I 1 is in a receiving state. 1 is a power cord plug for connecting to the power line l, 2 and 3 are coupling capacitors for superimposing the carrier signal on the power line, 4 is a power transformer, and 5 is a DC stabilizer for supplying drive power to each circuit. Power supply circuit, 6
is a bandpass filter that passes only the carrier signal; 7
8 is a demodulation circuit, 8 is a carrier wave signal detection circuit, 9 is a modulation circuit, 10 and 11 are audio signal amplification circuits, 12 is an audio signal detection circuit, 13 is an oscillation circuit necessary for automatically switching between transmission and reception, 14 is logic
OR gate, 15 is logical AND gate, 16 is
17 is a relay, 18 is a speaker that also serves as a microphone, 19 and 20 are transmission/reception changeover switches controlled by the relay 17, and 21 is an ON/OFF switch for a signal sent to the audio signal detection circuit 12.
第２図は要部の信号波形を示すもので、イは発
振回路８の出力、ロは発振回路１３の出力、ハは
検出回路１２の出力、ニはゲート１５の出力であ
る。 FIG. 2 shows the signal waveforms of the main parts, where A is the output of the oscillation circuit 8, B is the output of the oscillation circuit 13, C is the output of the detection circuit 12, and D is the output of the gate 15.
次にこの構成にもとづく動作を説明する。イン
ターホンI1にインターホンI2より送られた搬送信
号は、電力線ｌを伝播し、電源コードプラグ１、
結合コンデンサ２，３、帯域フイルタ６、切換ス
イツチ１９を経由し、復調回路７で音声信号を取
出すと同時に検出回路８で信号検知状態として負
の電圧を得、論理ゲート１５を強制的に負の電圧
とする。これによつてトランジスタ１６はOFF
状態になり、リレー１７は不動作状態となるため
インターホンI1は、インターホンI2からの送信が
続く限り、受信状態に保持される。一方復調回路
７の出力として得られた音声信号は、増幅回路１
０により増幅され、切換スイツチ２０を経由しス
ピーカ１８より放声される。 Next, the operation based on this configuration will be explained. The carrier signal sent from the intercom I 2 to the intercom I 1 propagates through the power line l, and is connected to the power cord plug 1,
The demodulation circuit 7 takes out the audio signal via the coupling capacitors 2 and 3, the band filter 6, and the changeover switch 19. At the same time, the detection circuit 8 obtains a negative voltage as a signal detection state, and the logic gate 15 is forced into the negative state. voltage. This turns transistor 16 off.
Since the relay 17 becomes inactive, the intercom I 1 remains in the receiving state as long as the transmission from the intercom I 2 continues. On the other hand, the audio signal obtained as the output of the demodulation circuit 7 is transmitted to the amplifier circuit 1
0, and is emitted from the speaker 18 via the changeover switch 20.
インターホンI2からの送信が無い場合は搬送波
信号検出回路８からの出力が正になるため、論理
ANDゲート１５の一方の入力が正になり、他方
が正になればトランジスタ１６が動作する状態に
なる。すなわち今この状態でスピーカ１８に向つ
て話すと、音声信号検出回路１２によつてそれが
検出されその出力端に正の電圧が得られるため、
これが論理ORゲート１４を介して論理ANDゲー
ト１５の他方の入力端に印加されることになり、
論理ANDゲート１５の出力が正になつてトラン
ジスタ１６が動作しリレー１７が動作して切換ス
イツチ１９，２０が自動的に送信側に切換えられ
る。 If there is no transmission from the intercom I 2 , the output from the carrier signal detection circuit 8 will be positive, so the logic
When one input of AND gate 15 becomes positive and the other becomes positive, transistor 16 becomes operational. That is, if you speak into the speaker 18 in this state, it will be detected by the audio signal detection circuit 12 and a positive voltage will be obtained at its output terminal.
This will be applied to the other input terminal of the logical AND gate 15 via the logical OR gate 14,
The output of the logical AND gate 15 becomes positive, the transistor 16 operates, the relay 17 operates, and the changeover switches 19 and 20 are automatically switched to the transmitting side.
そして、スピーカ１８に向つて話しない場合で
も発振回路１３が第２図ロに示すように間欠的に
一定周期で発振しているため第２図ハに示すよう
に論理ANDゲート１５の出力が間欠的に正にな
り、切換スイツチ１９，２０が間欠的に送信側に
切換えられる。 Even when the speaker 18 is not spoken, the oscillation circuit 13 intermittently oscillates at a constant period as shown in FIG. becomes positive, and the changeover switches 19 and 20 are intermittently switched to the transmission side.
ところで、インターホンI1が設置された場所が
騒音の非常に大きな場所であれば、スピーカ１８
から入力される騒音で音声信号検出回路１２の出
力が常に正になり続け、インターホンI1が常時送
信状態になり続け、受信状態にならないことあ
る。そのため、上記実施例ではON―OFFスイツ
チ２１を設け、このような場所に設置する場合に
は上記ON―OFFスイツチ２１をオフするように
している。ON―OFFスイツチ２１をオフすれば
先に記載したように発振回路１３の出力によつて
のみインターホンが間欠的に送信状態に切換えら
れることになり、スピーカ１８からの出力も間欠
的に増幅回路１１、変調回路９を介して電灯線１
に送信されることになる。 By the way, if the place where the intercom I 1 is installed is a very noisy place, the speaker 18
The output of the audio signal detection circuit 12 always remains positive due to the noise input from the intercom I1, which may keep the intercom I1 in the transmitting state and never in the receiving state. Therefore, in the embodiment described above, an ON-OFF switch 21 is provided, and when installed in such a place, the ON-OFF switch 21 is turned off. If the ON-OFF switch 21 is turned off, the intercom will be intermittently switched to the transmitting state only by the output of the oscillation circuit 13 as described above, and the output from the speaker 18 will also be intermittently switched to the amplifier circuit 11. , the power line 1 via the modulation circuit 9
will be sent to.
尚、この場合、送信される信号は若干不自然な
ものになるが発振回路１３そのものを第２図ロに
示すように正の信号を出力する時間を長く、負の
信号を出力する時間を極端に短かくしたものにす
れば送信される信号の途切れが極端に小さくなり
自然感をほとんど失わないようにすることができ
る。 In this case, the transmitted signal will be a little unnatural, but the oscillation circuit 13 itself should be configured so that the time it takes to output a positive signal is long and the time it outputs a negative signal is extremely long, as shown in Figure 2B. By making the length shorter, the interruptions in the transmitted signal will be extremely small and the natural feel will not be lost.
そして、このように間欠的に信号を出力する発
振回路１３を用いることにより、インターホンI1
は必ず間欠的に受信状態になる。そのため、イン
ターホンI2により再び送信があれば、それをのが
さず受信することができる。 By using the oscillation circuit 13 that outputs signals intermittently in this way, the intercom I 1
is always in the receiving state intermittently. Therefore, if there is another transmission from the intercom I2 , it can be received without being missed.
以上実施例により説明したが、本発明によれば
音声入力またはあらかじめ設定した発振回路の出
力及び受信々号の有無によつて自動的に送信、受
信を切換制御できるようにしているためにその通
話操作が容易におこなえる。 As explained above with reference to the embodiments, according to the present invention, transmission and reception can be automatically switched and controlled depending on voice input, the output of a preset oscillation circuit, and the presence or absence of received signals. Easy to operate.
第１図は本発明の一実施例における電力線搬送
式インターホン装置のブロツク図、第２図はその
要部の信号波形図である。
８…検出回路、１２…音声信号検出回路、１３
…発振回路、１７…リレー。
FIG. 1 is a block diagram of a power line carrier type intercom device according to an embodiment of the present invention, and FIG. 2 is a signal waveform diagram of the main parts thereof. 8...Detection circuit, 12...Audio signal detection circuit, 13
...Oscillation circuit, 17...Relay.
Claims (1)
する搬送波信号検出回路と、マイク兼用のスピー
カを通して入力された音声信号を検出する音声信
号検出回路とあらかじめ設定した周期で間欠的に
動作する発振回路と、上記音声信号検出回路の出
力と上記発振回路の出力の論理和をとる論理OR
ゲートと、上記音声信号検出回路の出力を任意に
阻止するスイツチと上記論理ORゲート出力と上
記搬送波信号検出回路の出力との論理積をとる論
理ANDゲートと、この論理ANDゲートの出力に
よつて駆動される送受切換スイツチとを備え、上
記搬送波信号検出回路が搬送波信号を検出しなか
つた状態で論理ORゲートより所定の信号が出力
されたときのみ上記送受切換スイツチを上記論理
ANDゲートの出力によつて送信側に切換えるよ
うに構成した電力線搬送式インターホン装置。1. A carrier wave signal detection circuit that detects a carrier wave signal input through a power line, an audio signal detection circuit that detects an audio signal input through a speaker that also serves as a microphone, an oscillation circuit that operates intermittently at a preset cycle, and the above-mentioned Logical OR that takes the logical sum of the output of the audio signal detection circuit and the output of the above oscillation circuit
A gate, a switch that arbitrarily blocks the output of the audio signal detection circuit, a logical AND gate that takes the AND of the output of the logical OR gate and the output of the carrier signal detection circuit, and the output of this logical AND gate. and a transmission/reception switching switch that is driven, and only when a predetermined signal is output from the logic OR gate while the carrier signal detection circuit does not detect a carrier signal, the transmission/reception switching switch is set to the logic state.
A power line carrier type intercom device configured to switch to the transmitting side based on the output of an AND gate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57128115A JPS5917765A (en) | 1982-07-21 | 1982-07-21 | Power line carrier intercom device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57128115A JPS5917765A (en) | 1982-07-21 | 1982-07-21 | Power line carrier intercom device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5917765A JPS5917765A (en) | 1984-01-30 |
| JPH0127621B2 true JPH0127621B2 (en) | 1989-05-30 |
Family
ID=14976744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57128115A Granted JPS5917765A (en) | 1982-07-21 | 1982-07-21 | Power line carrier intercom device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5917765A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0178961U (en) * | 1987-11-16 | 1989-05-26 | ||
| JP5486901B2 (en) * | 2009-11-06 | 2014-05-07 | 株式会社東芝 | Ultrasonic diagnostic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5475206A (en) * | 1977-11-28 | 1979-06-15 | Konii Onkiyou Kk | Carrier interphone having speech indicator |
-
1982
- 1982-07-21 JP JP57128115A patent/JPS5917765A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5917765A (en) | 1984-01-30 |
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