JPS5961322A - Radio telephone device - Google Patents

Radio telephone device

Info

Publication number
JPS5961322A
JPS5961322A JP57171850A JP17185082A JPS5961322A JP S5961322 A JPS5961322 A JP S5961322A JP 57171850 A JP57171850 A JP 57171850A JP 17185082 A JP17185082 A JP 17185082A JP S5961322 A JPS5961322 A JP S5961322A
Authority
JP
Japan
Prior art keywords
signal
slave station
master station
transmitter
station
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
Application number
JP57171850A
Other languages
Japanese (ja)
Inventor
Koji Ono
小野　晃二
Isao Sasaki
勲 佐々木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP57171850A priority Critical patent/JPS5961322A/en
Publication of JPS5961322A publication Critical patent/JPS5961322A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H04M1/72502—Cordless telephones with one base station connected to a single line

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE:To eliminate noise transmitted in the path of microphone of slave station hybrid circuit of master station receiver of slave station by the constitution that a slave turns off a transmitter after the transmission of a holding signal and a master station holds the operation of a receiver when the holding signal from the slave station is received. CONSTITUTION:When the slave station 41 operates a changeover switch 51 during communication, a signal generating circuit 52 is operated, the holding signal is applied to the transmitter 43 and the operation of the transmitter 43 is turned off after a prescribed time. When the master station 2 receives the said holding signal, the operation of the receiver 23 is held. In operating the changeover switch at the slave station 4, the transmitter 4 is operated and a holding release signal is applied to the transmitter 43 from the signal generating circuit 52. When the said holding release signal is received, the master station 2 releases the holding of the receiver 23.

Description

【発明の詳細な説明】 〔発明の技術分野Ｊ 本発明は、例えばコードレス電話装置１１？のように同
時送受話方式により通話を行なう叫線電話博ｉｄに係わ
り、特に周囲騒音の影響を軽減して通話品′Ｈの向上を
はかった無にダ屯話装置に関するっ 〔発明の技術的背景〕 従来、同時送受話方８式を適用した哄線電話装置として
、例えば第１図に示す如く加入者線ノに接続された親局
２と、この親局２に対し１爪線回線３を介して接続され
る子局４とからなるものがある。この装置の子局４は、
開削回路４１により親局２との間で接続制御を行なうと
ともに１送話器４２で鱗た送話信号を送信機４３から送
信アンテナ４４を介して送信用無線回線３ａへ送出し、
かつ親局２から送られる受話信号を受信アンテナ４５を
経て受信機４６で受信して受話器４７から音声として発
するように構成されている。一方親局２は、側副回路２
１により前記子局４と図示しない交換機との間の接続制
御を行なうとともに、前記子局４から到来する送話４８
号を受信アンテナ２２を経て受信機２３で受信したのち
ハイブリッド回路２４を介してｌＪ口人者線１へ送出し
、かつ加入者ｌ５ｌｉ！Ｊから到来する受話信号をハイ
ブリッド回路２４を介して送信機２５に堺び傘、この送
信機２５により送信アンテナ２６を介して受信用・戦線
回線３ｂへ送出するよ−うにｆｆ　ｌｉｄされている。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention J The present invention relates to, for example, a cordless telephone device 11? The present invention relates to a voice line telephone ID that performs calls using a simultaneous transmitting and receiving method, and in particular relates to a wireless communication device that reduces the influence of ambient noise and improves the quality of communication. Background] Conventionally, as shown in FIG. 1, as a telephone system to which eight types of simultaneous transmission and reception are applied, a base station 2 is connected to a subscriber line, and a single line line 3 is connected to the base station 2. There is one that consists of a slave station 4 connected via a slave station 4. The slave station 4 of this device is
The excavation circuit 41 controls the connection with the master station 2, and the transmitter 42 transmits the transmitted signal from the transmitter 43 to the transmitting radio line 3a via the transmitting antenna 44.
The receiver 46 receives a reception signal sent from the master station 2 via a reception antenna 45, and outputs it as voice from a receiver 47. On the other hand, the master station 2
1 controls the connection between the slave station 4 and an exchange (not shown), and transmits a call 48 arriving from the slave station 4.
The signal is received by the receiver 23 via the receiving antenna 22, and then sent to the lJ customer line 1 via the hybrid circuit 24, and is sent to the subscriber l5li! The reception signal coming from J is sent via the hybrid circuit 24 to the transmitter 25, and the transmitter 25 sends it out via the transmitting antenna 26 to the receiving line 3b.

なお、図中２７は親局２における平衡回路網である。Note that 27 in the figure is a balanced circuit network in the master station 2.

したがってこのような構成であれば、電波が届く範囲内
で、子局４を任意に移動させながら、通常の電話機と同
様に同時送受話方式による通話を行ない得る。したがっ
て、このように装置を製造現場等のように電話による指
示を受けながら作業を行なう場合に適用すると、著しく
有用である。Therefore, with such a configuration, it is possible to carry out calls using the simultaneous transmitting and receiving system like a normal telephone while moving the slave station 4 arbitrarily within the range where radio waves can reach. Therefore, it is extremely useful to apply this device to a manufacturing site where work is performed while receiving instructions over the telephone.

〔背景技術の問題点〕[Problems with background technology]

ところが、送話器４２では話者の音声ばかりテナ＜周囲
の騒音も同時に拾われる。そして、前記従来の装置にあ
っては、この騒音がｌｌ破ｓ、１ｙｓ−ｉｔμｌｌ〆ｔ
ｉｔ４音声とともに親局２に送られたのち、この親局２
のハイブリッド回路２４から送信機２５、受話無線回線
Ｊｂ、受信機４６を経て受話器４７に戻され、この受話
器４７から通話相手の音声とともに送出されるため、受
話音声のＳ／Ｎ劣化を生じ易かった。However, the transmitter 42 picks up not only the speaker's voice but also ambient noise at the same time. In the conventional device, this noise is
After being sent to the master station 2 along with the it4 audio, this master station 2
The signal is returned from the hybrid circuit 24 to the receiver 47 via the transmitter 25, the receiver radio line Jb, and the receiver 46, and is transmitted from the receiver 47 together with the voice of the other party, which tends to cause S/N deterioration of the receiver's voice. .

そこで、従来では音声と騒音との音圧レベル差を利用し
て変調回路の利得を可変し、これにより音声と騒音との
送出レベル差を顕著にする、いわゆる音声スイッチを設
けてＳ／Ｎの同上をはかつている。しかしながらこのよ
うな装置角は、一般に回路構成が複雑であり、しかも騒
音レベルが大きくて音声とのレベル差が少ない場合には
効果が少なかった。特に、１町述したように製造現場等
で使用する場合には、一般に掻音が大きいために効果的
ではなかった。Therefore, in the past, a so-called audio switch was installed to vary the gain of the modulation circuit by utilizing the difference in sound pressure level between the sound and the noise, thereby making the difference in the output level between the sound and the noise more noticeable. Same as above. However, such a device angle generally has a complicated circuit configuration, and is less effective when the noise level is high and the level difference from the voice is small. In particular, as mentioned above, when used at a manufacturing site, etc., it is generally not effective because the scratching noise is large.

〔発明の目的〕[Purpose of the invention]

本発明は、周囲騒音が大きくてもこれに影響されること
なく８／Ｎが良く明瞭な受話を行ない帛る、ようにし、
通話品′Ｗが高くかつ構成の簡単々無線電話装置を提供
することを目的とする。The present invention enables clear reception of 8/N without being affected by large ambient noise,
To provide a wireless telephone device with high communication quality and simple configuration.

〔発明の概・出〕[Outline of the invention]

本発明は、上記目的を達成するために、子局に切換スイ
ッチを保留制御信号を発生するための信号発生回路とを
設けるとともに、親局に上記保留ｔｉｌｌ　１９１信号
を検出する信号検出回路を設け、上記切換スイッチが切
換操作されたとき子局から保留制御信号を送出して親局
の受信機の受信動作を停止させずに保留し、かっこの保
留処置の完了後子局の送信機の送信＋、＋ｉ＃作を停止
させて、以後子局から騒音により変調された信号が親局
へ送出されないようにしたものである。In order to achieve the above object, the present invention provides a signal generation circuit for generating a hold control signal for a changeover switch in a slave station, and a signal detection circuit for detecting the hold till 191 signal in a master station. , When the above changeover switch is operated, the slave station sends a hold control signal to hold the receiving operation of the receiver of the master station without stopping, and after the hold procedure in parentheses is completed, the transmitter of the slave station transmits. +, +i# operation is stopped to prevent the slave station from transmitting a signal modulated by noise to the master station from then on.

〔発明の実施例〕[Embodiments of the invention]

第２図は、本発明の一実ＩＭｉ列における無線′市話装
置の、ブロック構成図で、前記第１図と同一部分には同
一符号を付して詳しい説明は省略する。FIG. 2 is a block diagram of a wireless local communication device in the IMi series according to the present invention, and the same parts as in FIG.

第２図において、子局４には、自己の送信機４３の送信
−１作を停止させるための切換スイッチ５１ど、保留信
号およびそのＩＩＩイ除信呼信号生するための信号発生
回路５２とがそれぞれ設けである。そして、このような
子局４のｔｔｉｌｌ　７１１１１回路４１は、親局２と
の間の接続制御の他に、次の各捕間を行なうようにＷＲ
成されている。その制６１１１とは、 （１）　　曲常通話中に、制御スイッチ５ノが辿常通話
１１１　（接点開枚の状態）から送信機４３をオフする
側（接点を投入した状態）に切換ゎり、これにより切換
信号が供給されたと考、先ず信号発生回路５２を動作状
態として保留信号を発生させ、この信号を送（Ｊ機４３
より親局２へ送出させる制量Ｄ０ （１１）中の制御を終了したのち、一定時間経過した時
点でセリえはリレー回路を働かせることにより送信機４
３へのｍ源出力の供給路を断って送信機４３を不動作状
態とし、これにより以後の電波の送出をオフさせる側副
。ここで、上記送信機４３を不動作状態にするまでの時
間は、親局２において受信機２３の動作状態の保留が完
了するまでに要する時間以上に定められる。In FIG. 2, the slave station 4 includes a changeover switch 51 for stopping the transmission-1 operation of its own transmitter 43, and a signal generation circuit 52 for generating a hold signal and its III-1 cancel call signal. are provided respectively. In addition to controlling the connection with the master station 2, the ttill 71111 circuit 41 of the slave station 4 controls the WR to perform the following inter-capturing operations.
has been completed. The control 6111 is as follows: (1) During a continuous call, the control switch 5 switches from the normal call 111 (contact open state) to the side that turns off the transmitter 43 (contact closed state); Considering that the switching signal has been supplied by this, first, the signal generation circuit 52 is activated to generate a hold signal, and this signal is sent (J machine 43
After completing the control in (11), the series activates the relay circuit to transmit the signal to the transmitter 4.
3, the transmitter 43 is put into an inoperable state, and thereby the subsequent transmission of radio waves is turned off. Here, the time it takes for the transmitter 43 to become inactive is set to be longer than the time required for the master station 2 to complete suspending the operating state of the receiver 23 .

（１１０送信８！４３のオフ期間中に、切換スイッチ５
１が復帰操作されたとき、これを検出して先ず送信機４
３への電源出方の供給を再開させ、しかるのち信号発生
回路５２がら保留状態を解除するための信号、つまり解
除信号を発生させてこの信号を送信機４３より親局２へ
送出させる制御。(During the off period of 110 transmission 8!43, selector switch 5
When 1 is reset, this is detected and the transmitter 4 is
3, and then the signal generation circuit 52 generates a signal for canceling the hold state, that is, a release signal, and the transmitter 43 sends this signal to the master station 2.

である。It is.

一方、親局２には、子局４から送られた保留信号および
解除信号をそれぞれ検出する信号検出回路６１が設けで
ある。そして、この親局２の制ｉｎ回路２１は、子局４
との間の接続制御の他に、次の各制御を行なう。そのｔ
ｔｉｌｌ　１ｔｔｌｌとは、中　子局４から保留信号が
到来し、この信号が信号検出回路６１で検出されてその
旨を示す信号が供給されたと精、受信機２３の受信状態
を保留させる制御。On the other hand, the master station 2 is provided with a signal detection circuit 61 that detects the hold signal and release signal sent from the slave station 4, respectively. The control circuit 21 of the master station 2 is connected to the slave station 4.
In addition to controlling the connection between That t
"till 1ttll" is a control that suspends the receiving state of the receiver 23 just when a hold signal arrives from the core station 4, this signal is detected by the signal detection circuit 61, and a signal indicating this is supplied.

（１１）　　この保留状態において、子局４から解助信
号が到来し、この信号が信号検出量ｌＩ！８６１で検出
されてこの回路６１からその旨を示す信号が供給された
とき、受信機２３の保留状態を解除する制約。(11) In this pending state, a relief signal arrives from the slave station 4, and this signal is the signal detection amount lI! 861 and a signal indicating this is supplied from this circuit 61, a restriction that releases the hold state of the receiver 23.

である。It is.

このような構成であるから、通常通話中に、切換スイッ
チ５１を切換操作すると、信号発生回路５２から保留信
号が発生されてこの信号は送信１１４３から親局２へ送
出される。これに対し親局２では、上記保留信号が信号
検出回ｌ＠６ノで検出された時点で、受信機２３の受信
状態が保留される。この結果受信機２３は、以後子局４
の送信ｔ４４３がオフとなってもそのまま受信動作を継
続する。With such a configuration, when the selector switch 51 is operated during a normal call, a hold signal is generated from the signal generating circuit 52 and this signal is sent from the transmitter 1143 to the master station 2. On the other hand, in the master station 2, the reception state of the receiver 23 is put on hold at the time when the above-mentioned hold signal is detected at the signal detection cycle l@6. As a result, the receiver 23 subsequently receives the slave station 4.
Even if the transmission t443 is turned off, the receiving operation continues as is.

一方、上記のように保留信号の送出を行なうと、子局４
では上記親局２における受信機２３の保留制御が完了す
る時間だけ経過した時点で、制（財）回路４１から信号
が発生され、この結果送信機４３への電源出力の供給が
断たれて送信機４３は不動作状態に移行する。したがっ
て、以後送信Ｒ４３からは電波の送出は行なわ−れず、
このため周囲騒音が親局２へ送出され、親局２から子局
４へ送り返されて受話音声に悪影響を与えるといった不
具合は全く生じない。したがって、例えば周囲騒音が大
希い場所で電話による指示を受けながら作業をする場合
において、送話器４２を手で押えて騒音が送出され・禰
いようにする等の操作を行なうことなく、明瞭度の高い
受話を行なうことができる。また、本実施例では、送信
機４３への電源出力の供給をオフすることにより電波が
送出されないようにしているので、送信機４３を駆動し
た状態で電波の送出のみを停止させるものに比べて、消
！！力の低減をはかることができる。この効果は、電１
１ｕ等のバッテリをｉｌｌとした子局４にあって、バッ
テリ、の延命化をはかる上で極めて貞効である。On the other hand, if the hold signal is sent as described above, the slave station 4
Then, when the time period for which the hold control of the receiver 23 in the master station 2 is completed has elapsed, a signal is generated from the control circuit 41, and as a result, the supply of power output to the transmitter 43 is cut off and transmission is stopped. The machine 43 transitions to an inactive state. Therefore, from now on, no radio waves will be transmitted from the transmitter R43,
Therefore, the problem that ambient noise is sent to the master station 2 and sent back from the master station 2 to the slave station 4 and adversely affects the received voice does not occur at all. Therefore, for example, when working while receiving instructions over the phone in a place where there is a lot of ambient noise, there is no need to press the transmitter 42 with your hand to cause the noise to be emitted or drown out. You can receive calls with high clarity. Furthermore, in this embodiment, the power output to the transmitter 43 is turned off to prevent the transmission of radio waves, so this is more effective than a system in which only the transmission of radio waves is stopped while the transmitter 43 is driven. , erase! ! It is possible to reduce the force. This effect is
In the slave station 4 which uses a battery such as 1U as illumination, it is extremely effective in extending the life of the battery.

一方、以上のような送信機４３のオフ状態な襞帰させる
には、切換スイッチ５１を復帰操作するだけでよい。す
なわち、切換スイッチ５１の操作と同時に送信機４３に
電源出方が供給されて送信機４３が動作状態に復帰し、
続いて親局２へ解除信号が送出されて親局２の受信機２
３は保留状態が解除されろう なお、本発明は上記実施例に限定されるものではない。On the other hand, in order to return the transmitter 43 to the OFF state as described above, it is sufficient to simply reset the changeover switch 51. That is, at the same time as the changeover switch 51 is operated, the power source is supplied to the transmitter 43, and the transmitter 43 returns to the operating state.
Subsequently, a release signal is sent to the master station 2, and the receiver 2 of the master station 2
However, the present invention is not limited to the above embodiment.

例えば、上記実施例では、保留信号と解除信号とをトー
ン固波数を変えることにより別の信号として保留制御１
１１を行なったが、両信号を同一の信号とし、通常１−
話状態において同信号が到来したときには保留信号、保
留状態において到来したときには解除信号とそれぞれ識
別して保留側■を行なってもよい。また、切換スイッチ
は、終話時にフックスイッチに連動して自動的に僕帰す
るように構成してもよい。このようにすれば通話開始時
には必ず通常通話を行なうことができる。さらに、本発
明は音声スイッチと併用してもよい。また、本発明の応
用例として、第３図に示す如く子局４の送信機４３と送
話器４２との間に、その信号路をオン・オフするための
スイッチ７０を挿設し、このスイッチ７０を操作するこ
とＫよりＩ周囲騒音の送出を阻止するようにしてもよい
。さらに、信号路をオン・オフする換わりに変調入力の
レベルを一定着以下に下げるようＫしてもよい。For example, in the above embodiment, the hold signal and the release signal are converted into separate signals by changing the tone wave number.
11 was performed, but both signals were the same signal, and normally 1-
When the same signal arrives in the busy state, it is recognized as a hold signal, and when it arrives in the hold state, it is recognized as a release signal, and the hold side (2) may be performed. Further, the changeover switch may be configured to automatically return the call in conjunction with the hook switch when the call ends. In this way, a normal call can always be made when starting a call. Additionally, the present invention may be used in conjunction with an audio switch. Further, as an application example of the present invention, a switch 70 for turning on/off the signal path is inserted between the transmitter 43 and the transmitter 42 of the slave station 4 as shown in FIG. By operating the switch 70, the output of ambient noise may be prevented. Furthermore, instead of turning the signal path on and off, the level of the modulation input may be lowered below a certain level.

〔発明の効果〕〔Effect of the invention〕

以上詳述したように本発明は、子局に切換スイッチと保
留制御信号を発生するための信号発生回路とを設けると
ともに、親局に上記保留制御信号を検出する信号検出回
路を設け、上記切４！！スイッチが切４％　１％作され
たと入子局から保留側６ηｌ信号を送出して親局の受信
機の受信動作を停止させずに保留し、この保留処置の完
了後に子局の送信機の送信動作を停市させるようにした
ものである。As described in detail above, the present invention provides a changeover switch and a signal generation circuit for generating the hold control signal in the slave station, and a signal detection circuit for detecting the hold control signal in the master station. 4! ! When the switch is turned off, the nested station sends a hold side 6ηl signal to hold the receiving operation of the master station's receiver without stopping, and after the completion of this holding process, the slave station's transmitter is switched off. This is designed to stop the transmission operation.

したがって、本発明によれば、周囲騒音が大きくても′
これに影響されることなく８／Ｎが良く明瞭な受話を行
なうことができ、通話品質が高くかつｖｆＩ成の簡単な
暗線電話装置を提供することができる。Therefore, according to the present invention, even if the ambient noise is large,
It is possible to provide a dark line telephone device that can receive clear calls with good 8/N without being affected by this, has high call quality, and has a simple VFI configuration.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来における無線電話装置のブロック構成図、
第２図は本発明の一帽軸１１における無線電話装置のブ
ロックＩｆｌｖ戊図、第３図は本発明のしぢ用例を示す
−Ｊ洪線を話装置のブロック構成図である。FIG. 1 is a block diagram of a conventional wireless telephone device.
FIG. 2 is a block diagram of a wireless telephone device in the headphone shaft 11 of the present invention, and FIG. 3 is a block configuration diagram of a J-Hong line communication device showing an example of the use of the present invention.

Claims (3)

【特許請求の範囲】[Claims] （１）加入者線に接続された親局と、この親局に対し無
線回線を介して接続される子局とからなる無線電話装置
において、子局にｔＩ７Ｊ換スイッチと、この切換スイ
ッチの切購操作時に送信回線を保留するための保留側副
信号を発生する信号発生回路とを設け、かつ親局に上記
保留側副信号を検出する信号検出回路を設け、通常通話
時に前記切換スイッチが切づ負操作されたとき、子局は
前記信号発生回路から保留側副信号を発生してこの信号
を送信磯により親局へ送出するとともに、この信号送出
イ※上記送信機の送信動作をオフし、親局は子局からの
前記保留開削信号を信号検出回路で検出し、この信号の
検出をもって受信機の受信動作を保留するように構成し
たことを特徴とする無線電話装置。(1) In a wireless telephone device consisting of a master station connected to a subscriber line and a slave station connected to the master station via a wireless line, the slave station has a tI7J switch and a switch for switching the switch. A signal generation circuit that generates a holding side sub-signal to hold the transmission line during a purchasing operation is provided, and a signal detection circuit is provided at the master station to detect the holding side sub-signal, and the changeover switch is turned off during a normal call. When negative operation is performed, the slave station generates a hold side sub-signal from the signal generation circuit and sends this signal to the master station via the transmitter. 2. A wireless telephone device, characterized in that the master station is configured to detect the hold-cut signal from the slave station with a signal detection circuit, and to suspend the reception operation of the receiver upon detection of this signal. （２）子局は、保留制御ＩｆＩｌ信号の送出後送信機へ
の霜、＃出力の供給を断することにより送信動作をオフ
するようにしたことを特徴とする特許請求の範囲第（１
）項記載の）ハ（線電１話装置。(2) The slave station turns off the transmission operation by cutting off the supply of frost and # output to the transmitter after transmitting the hold control IfIl signal.
) (Line telephone 1-phone device). （３）子局は、自己の送信動作停止中に切換スイッチが
復帰操作されたとき自己の送信動作を復帰さ゛せて解除
信号を送出［７、親局はこの解除信号を検出したとき保
留中の通話モードを通常通話状態に復帰させるものであ
ることを特徴とする特許請求の範囲第ｆｉｌ頃記戦の熊
線雷話装置。(3) When the changeover switch is operated to restore the slave station while its own transmission operation is stopped, the slave station restores its own transmission operation and sends out a release signal [7. When the master station detects this release signal, the master station A Kumasen Raiwa talking device according to claim 1, characterized in that the call mode is returned to a normal call state.
JP57171850A 1982-09-30 1982-09-30 Radio telephone device Pending JPS5961322A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57171850A JPS5961322A (en) 1982-09-30 1982-09-30 Radio telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57171850A JPS5961322A (en) 1982-09-30 1982-09-30 Radio telephone device

Publications (1)

Publication Number Publication Date
JPS5961322A true JPS5961322A (en) 1984-04-07

Family

ID=15930927

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57171850A Pending JPS5961322A (en) 1982-09-30 1982-09-30 Radio telephone device

Country Status (1)

Country Link
JP (1) JPS5961322A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62294341A (en) * 1986-06-13 1987-12-21 Nec Corp Radiothlephony system
JPS62296630A (en) * 1986-06-16 1987-12-23 Toshiba Corp Holding system in radiotelephony equipment
EP0435775A2 (en) * 1989-12-27 1991-07-03 Sony Corporation Cordless telephone

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62294341A (en) * 1986-06-13 1987-12-21 Nec Corp Radiothlephony system
JPS62296630A (en) * 1986-06-16 1987-12-23 Toshiba Corp Holding system in radiotelephony equipment
EP0435775A2 (en) * 1989-12-27 1991-07-03 Sony Corporation Cordless telephone
US5363430A (en) * 1989-12-27 1994-11-08 Sony Corporation Cordless telephone apparatus having a low power stand-by mode and a hold mode

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