JPH087715Y2 - Cordless telephone device - Google Patents
Cordless telephone deviceInfo
- Publication number
- JPH087715Y2 JPH087715Y2 JP1988117784U JP11778488U JPH087715Y2 JP H087715 Y2 JPH087715 Y2 JP H087715Y2 JP 1988117784 U JP1988117784 U JP 1988117784U JP 11778488 U JP11778488 U JP 11778488U JP H087715 Y2 JPH087715 Y2 JP H087715Y2
- Authority
- JP
- Japan
- Prior art keywords
- modulator
- telephone line
- level
- cordless telephone
- transceiver
- 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 - Lifetime
Links
Description
【考案の詳細な説明】 「産業上の利用分野」 本考案は基地局の送受信機各各の音声入出力端が既設
の電話回線の端末に接続装置を介して結合されているコ
ードレス電話装置の音質改善に適用して良好なものであ
り、電話回線電流の大小、及び音声レベルの高低に拘わ
りなく常に一定な音量，歪率，側音が保持されて通話明
瞭度を確保せんとするものである。DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to a cordless telephone device in which the voice input / output terminals of each transceiver of a base station are connected to a terminal of an existing telephone line through a connection device. It is a good one applied to improve the sound quality, and it is intended to secure the intelligibility of the call by always maintaining a constant volume, distortion, and sidetone regardless of the magnitude of the telephone line current and the level of the voice level. is there.
「従来の技術」 一般に電話回線は回線径が小さければ小さいほど、ま
た長距離になるほど信号の減衰が大きいので、このよう
な回線の状況に応じて音量を変化させるオートパッド機
能と称する方式が採用されている電話機がある。この方
式の電話機は、電話回線に接続する電話回線接続部にお
いて回線の直流電流の大小レベルを検出し、接続部内の
増幅器の利得を制御するものである。"Prior art" Generally, the smaller the line diameter of a telephone line and the longer the distance, the greater the signal attenuation. Therefore, a method called the auto pad function that changes the volume according to the situation of the line is adopted. There is a telephone that has been. In this type of telephone, the level of the direct current of the line is detected in the telephone line connection section connected to the telephone line, and the gain of the amplifier in the connection section is controlled.
従って回線電流が減少したときに例えば第３図のよう
に利得Ｇを上げることにより音声レベルを増加させてい
るが、構内交換機の種類によっては回線電流が少ないに
も拘わらず音声レベルの高いものがあるので、これにオ
ートパッド機能付の電話機を敷設すると、オートパッド
作用のために音声が更に大きくなって音声に歪を生じた
り、送受話器をバイパスする側音が増加する結果、通話
の明瞭度を著るしく劣化させる障害が発生する。Therefore, when the line current decreases, the voice level is increased by increasing the gain G, for example, as shown in FIG. 3. However, depending on the type of private branch exchange, a line level is high although the line current is low. Therefore, if a telephone with an auto pad function is laid on this, the voice becomes even louder due to the auto pad function and the sound is distorted, and the side tone that bypasses the handset increases, resulting in intelligibility of the call. Occurs, which significantly deteriorates.
「考案が解決しようとする問題点」 かくて前記従来の障害に鑑みて回線電流の大小、音声
レベルの高低に関係なく、常に一定の音量，歪率に保た
れ、側音の増加を抑えることによって通話の明瞭度の劣
化を防止しようとするにある。“Problems to be solved by the device” Thus, in view of the above-mentioned conventional obstacles, regardless of the magnitude of the line current and the level of the voice level, the volume and distortion are constantly maintained at a constant level and the increase in sidetone is suppressed. This is to prevent the deterioration of the intelligibility of the call.
「問題点を解決するための手段」 そこで本考案は送信機の変調入力側と電話回線接続部
との間に電話回線からの音声信号を常に一定ならしめる
レベル制御手段を設けることによって変調部において歪
の発生する原因を除去するものである。"Means for solving the problem" Therefore, the present invention is provided in the modulator by providing level control means between the modulation input side of the transmitter and the telephone line connection to keep the voice signal from the telephone line constant. This is to eliminate the cause of distortion.
以下に図面により本考案の一実施例を説明する。 An embodiment of the present invention will be described below with reference to the drawings.
「実施例」 第１図は交換機に接続される電話回線の端子L1，L2に
電話回線接続部TC、自動レベル制御回路３、FM変調器２
及び無線送受信機１の送信段とが接続される基地局の結
線図である。そして上記FM変調器２はリミッタＬ及び変
調入力増幅器21からなり、自動レベル制御回路３は検波
器Ｍ及び自動レベル制御増幅器22よりなる。また、電話
回線接続部TCは第２図に詳記するように、電話回線L1，
L2のアナログ式２線が送受話回路をハイブリッド回路に
よって分離されて４線変換し送受話用増幅器にそれぞれ
接続するスピーチネットワークから送信段へは変調器を
介して送話器へ、もう一方は受信後の検波器を介して相
手側受話器へと伝送される。そして上記スピーチネット
ワーク４へはダイヤルトーンDTMFが送られる。BNはスピ
ーチネットワーク４の電話回線とのインピーダンス整合
をとるための素子である。[Embodiment] FIG. 1 shows the telephone line terminals L 1 and L 2 connected to the exchange, the telephone line connection section TC, the automatic level control circuit 3, and the FM modulator 2.
2 is a connection diagram of a base station to which the transmission stage of the wireless transceiver 1 is connected. The FM modulator 2 comprises a limiter L and a modulation input amplifier 21, and the automatic level control circuit 3 comprises a detector M and an automatic level control amplifier 22. In addition, the telephone line connection section TC has a telephone line L 1 as shown in FIG.
The analog 2 lines of L 2 are separated from each other by the hybrid circuit in the transmitting / receiving circuit, converted into 4 lines and connected to the transmitting / receiving amplifiers. From the speech network to the transmitting stage through the modulator to the transmitting device, the other is It is transmitted to the other party's receiver via the wave detector after reception. Then, the dial tone DTMF is sent to the speech network 4. BN is an element for impedance matching with the telephone line of the speech network 4.
また前記送信段に接続されるFM変調器２内の変調入力
増幅器21はマイクロホン即ち送話器への入力の増幅作用
を司り、リミッタＬがその変調を制限する。自動レベル
制御回路３内の自動レベル制御増幅器22は次段の検波段
におけるダイオードによる検波レベルまで増幅作用し、
上記検波器Ｍが直流変換して自動的にレベル制御をかけ
る。The modulation input amplifier 21 in the FM modulator 2 connected to the transmission stage controls the amplification of the input to the microphone, that is, the transmitter, and the limiter L limits the modulation. The automatic level control amplifier 22 in the automatic level control circuit 3 amplifies the detection level by the diode in the next detection stage,
The detector M converts the direct current and automatically controls the level.
側音は送話器つまりマイクロホンに入力された音声信
号が同じハンドセットの受話器つまりスピーカにバイパ
スする現象で、第２図の点線ルートが送話音、一点鎖線
が受話音ルートを夫夫表わし太点線が側音に相当する。Sidetone is a phenomenon in which a voice signal input to a transmitter or microphone bypasses the receiver or speaker of the same handset. The dotted line route in Fig. 2 represents the transmitting sound, and the alternate long and short dash line represents the receiving sound route. Corresponds to the sidetone.
「効果」 かくて本考案によれば電話回線と接続される接続装置
を敷設した基地局側のリミッタとしての変調器入力段に
自動レベル制御回路を接続して接続装置から変調器への
入力レベルを一定にする帰還ループを形成することによ
り、電話回線の電流，音声の大小とは無関係に変調部で
の歪を取除いて一定の音量，歪率に保つことが可能にな
って側音までも一定にすることができる。[Effect] Thus, according to the present invention, the input level from the connection device to the modulator is connected by connecting the automatic level control circuit to the modulator input stage as the limiter on the base station side where the connection device connected to the telephone line is laid. By forming a feedback loop that keeps constant, it is possible to remove distortion in the modulation section and maintain a constant volume and distortion regardless of the telephone line current and the volume of voice. Can also be constant.
特に交換機が変ろうとも、回線電流、音声レベルの大
小に無関係に側音を増やさず通話の明瞭度を得ることが
できるという実益がある。In particular, even if the exchange is changed, the intelligibility of the call can be obtained without increasing the side tone regardless of the magnitude of the line current and the voice level.
第１図は本考案装置の回路構成図、第２図は側音を説明
するための回路図、第３図は回線電流と送受話利得との
関係を表わすグラフである。 1:無線送受信機、2:FM変調器、3:自動レベル制御回路、
TC:電話回線接続部、4:スピーチネットワーク。FIG. 1 is a circuit diagram of the device of the present invention, FIG. 2 is a circuit diagram for explaining sidetone, and FIG. 3 is a graph showing a relation between a line current and a transmission / reception gain. 1: Wireless transceiver, 2: FM modulator, 3: Automatic level control circuit,
TC: Telephone line connection, 4: Speech network.
Claims (1)
続された基地局と、移動可能な送受信機からなる移動局
との間を無線リンクを介して通話できるようにしたコー
ドレス電話装置において、前記基地局の接続装置と送受
信機の変調器におけるリミッタとの間に、このリミッタ
の前段に配置される変調入力増幅器の出力レベルに基づ
いて前記接続装置から変調器への入力レベルを一定にす
る帰還ループが形成されたことを特徴とするコードレス
電話装置。1. A cordless telephone device capable of communicating via a wireless link between a base station having a transceiver connected to a telephone line via a connection device and a mobile station composed of a movable transceiver. , Between the connection device of the base station and the limiter in the modulator of the transceiver, the input level from the connection device to the modulator is made constant based on the output level of the modulation input amplifier arranged before the limiter. A cordless telephone device characterized in that a feedback loop is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988117784U JPH087715Y2 (en) | 1988-09-07 | 1988-09-07 | Cordless telephone device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988117784U JPH087715Y2 (en) | 1988-09-07 | 1988-09-07 | Cordless telephone device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0238843U JPH0238843U (en) | 1990-03-15 |
| JPH087715Y2 true JPH087715Y2 (en) | 1996-03-04 |
Family
ID=31361545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988117784U Expired - Lifetime JPH087715Y2 (en) | 1988-09-07 | 1988-09-07 | Cordless telephone device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH087715Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54106104A (en) * | 1978-02-08 | 1979-08-20 | Toshiba Corp | Control signal receiving circuit |
| JPS6150429A (en) * | 1984-08-20 | 1986-03-12 | Toshiba Corp | Reception sound volume adjusting system of radiotelephone set |
-
1988
- 1988-09-07 JP JP1988117784U patent/JPH087715Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54106104A (en) * | 1978-02-08 | 1979-08-20 | Toshiba Corp | Control signal receiving circuit |
| JPS6150429A (en) * | 1984-08-20 | 1986-03-12 | Toshiba Corp | Reception sound volume adjusting system of radiotelephone set |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0238843U (en) | 1990-03-15 |
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