JPS6329861B2 - - Google Patents
Info
- Publication number
- JPS6329861B2 JPS6329861B2 JP56005104A JP510481A JPS6329861B2 JP S6329861 B2 JPS6329861 B2 JP S6329861B2 JP 56005104 A JP56005104 A JP 56005104A JP 510481 A JP510481 A JP 510481A JP S6329861 B2 JPS6329861 B2 JP S6329861B2
- Authority
- JP
- Japan
- Prior art keywords
- interrupt
- slave station
- master station
- signal
- slave
- 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
- 230000005540 biological transmission Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005236 sound signal Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Description
【発明の詳細な説明】
本発明は、親局と複数の子局間で通信を行なう
無線通信方式における割込み可能な子局の無線送
信機制御方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wireless transmitter control method for an interruptible slave station in a wireless communication system in which communication is performed between a master station and a plurality of slave stations.
従来、１組の無線チヤンネル、すなわち送信受
信各１波を使用して１つの親局を中心として多く
の子局との間に同時送受話による通信を行なう通
信方式において、親局と１つの子局とを通話中、
その通話を実質上妨げることなく他の子局が簡単
な操作で割込通信を行なうことのできるよう、次
の方式が採用されている。第１図のタイムチヤー
トを参照して説明すると、まず、親局と１つの子
局が通話中、他の子局は割込を要求するために割
込用の釦を押す。通常、この割込用釦はロツク型
か、若しくは、押されることが電気的に記憶され
るように構成されている。親局内では、一定時間
ごとに波形Ａに見られるようなパルス信号を発生
させておき、かつ送話信号を検出して話中である
ことを示す信号Ｂをつくる。そして、この信号Ｂ
と上記パルス信号Ａとの論理積をとつて一定時間
の幅を有する割込許可信号Ｃをつくり、これを子
局に向けて送信する。この割込許可信号Ｃを検出
した通話中の子局は、波形Ｄに見られるごとく、
通話中においても割込許可信号Ｃの検出時に強制
的に送信が停められる。一方、割込みを行ないた
い他の子局はすでに割込釦を押して、これが記憶
されているから、波形Ｅに示すように通話中の子
局の送信が強制的に停止している間に電波を送出
し、混信することなく割込みの要求を親局に知ら
せることができる。 Conventionally, in a communication system that uses one set of wireless channels, that is, one wave for each transmission and reception, to perform communication between one master station and many slave stations by simultaneous transmission and reception, the master station and one slave station While talking to the station,
The following method is adopted so that other slave stations can perform interrupt communication with simple operations without substantially interfering with the call. To explain with reference to the time chart of FIG. 1, first, while the master station and one slave station are talking, the other slave station presses an interrupt button to request an interruption. Usually, this interrupt button is of a lock type or is configured so that pressing it is electrically memorized. In the master station, a pulse signal as shown in waveform A is generated at regular intervals, and a signal B is generated by detecting a transmitting signal to indicate that a call is being made. And this signal B
and the above-mentioned pulse signal A to generate an interrupt permission signal C having a certain time width, and transmit it to the slave station. As seen in waveform D, the slave station in the middle of a call detects this interrupt permission signal C.
Even during a call, transmission is forcibly stopped when the interrupt permission signal C is detected. On the other hand, other slave stations that wish to interrupt have already pressed the interrupt button and this has been memorized, so as shown in waveform E, the slave stations that are currently talking can transmit radio waves while their transmission is forcibly stopped. The interrupt request can be sent to the master station without causing interference.
しかし乍ら、このような割込方式は、子局が通
話中でも受信機が常に待受け状態にあつて、割込
許可信号を検出することのできる同時送受話無線
機でなければ確実に行なうことができない。例え
ば、２波同時送受話の親局と子局の他に、さらに
子局として小型軽量で携帯用の２波プレストーク
型無線機が必要となる場合がある。このように、
子局として両者が混在するシステムにおいては、
親局をプレストーク型子局が通話中の場合、一般
的に親局が送話している時に子局が送信してしま
うとか、子局が割込許可信号を検出できないうち
にプレスして送話をはじめてしまうことがあり、
そのために、他の子局からの割込みができないと
言う欠点があつた。 However, such an interrupt method cannot be used reliably unless the receiver is always in standby mode even when the slave station is talking, and the simultaneous transmitting and receiving radio is capable of detecting the interrupt permission signal. Can not. For example, in addition to a master station and a slave station for simultaneous transmission and reception of two waves, a small, lightweight, and portable two-wave press talk radio device may be required as a slave station. in this way,
In a system where both are mixed as slave stations,
When a slave station that presses the master station is talking, it generally happens that the slave station transmits while the master station is transmitting, or that the slave station presses and sends the interrupt permission signal before it can detect it. Sometimes I start talking,
Therefore, it had the disadvantage that it could not be interrupted by other slave stations.
本発明の目的は、上記の欠点を除去し、送話中
は受信状態にないプレストーク型子局が親局と通
話中でも、他の子局よりの割込を確実にすること
のできる子局の無線送信機制御方式を提供するに
ある。 It is an object of the present invention to provide a slave station that eliminates the above-mentioned drawbacks and that is capable of ensuring interruption by other slave stations even when a press-talk type slave station that is not in a receiving state while transmitting a call is in a conversation with a master station. To provide a wireless transmitter control method.
本発明によれば、親局無線機と同時送受話型お
よびプレストーク型の２種類が混在る複数の子局
無線機との間で選択的に通信を行なう無線通信方
式において、前記親局無線機には、該親局無線機
が通話中でない時間に割込同期信号を該無線機か
ら前記複数の子局無線機に送出する手段を設け、
前記複数の子局無線機には、前記親局無線機から
うけた割込同期信号により、該割込同期信号より
インタバルが短かく、かつ該割込同期信号に同期
した連続タイミングパルスを発生する手段を設け
ることによつて、割込発生時における通話中の子
局無線機に対して、該子局無線機内で発生した前
記タミングパルスにより該子局無線機の送信を一
定時間強制停止するように制御することを特徴と
した子局の無線送信機制御方式が得られる。 According to the present invention, in a wireless communication system that selectively communicates between a master station radio and a plurality of slave station radios of two types, simultaneous transmission/reception type and press talk type, the master station radio The machine is provided with means for sending an interrupt synchronization signal from the radio to the plurality of slave radios during a time when the master radio is not busy,
In response to the interrupt synchronization signal received from the master station radio, the plural slave station radios generate continuous timing pulses having an interval shorter than the interrupt synchronization signal and synchronized with the interrupt synchronization signal. By providing a means, the timing pulse generated within the slave station radio causes the transmission of the slave station radio to be forcibly stopped for a certain period of time for the slave station radio that is in the middle of a call when an interrupt occurs. Thus, a wireless transmitter control method for a slave station is obtained, which is characterized by controlling the wireless transmitter of a slave station.
次に、本発明による子局の無線送信機制御方式
について実施例を挙げ、図面を参照して説明す
る。 Next, a wireless transmitter control method for a slave station according to the present invention will be described with reference to the drawings, using examples.
第２図は本発明による実施例の親局送信機側の
構成をブロツク図により示したものである。この
図において、割込ブロツクパルス発生器３の出力
は端子１から与えられる音声信号を検出器２で検
出したものとアンド回路４で一致がとられる。こ
の一致信号はゲート回路５に与えられ、ここで、
割込許可信号発生器６からの信号を時間制御し、
t5なる時間幅の割込許可信号として送信機１２
へ送る。送信機１２はこの信号により変調をか
け、空中線１３を介して送信する。一方、割込ク
ロツクパルス発生器３の出力周波数を分周器８に
より分周したものはアンド回路９に与えられ、こ
こで、検出器２の検出出力をインバータ回路７で
極性反転した出力、すなわち、送話中でないこと
を示す出力との一致がとられる。この一致信号は
ゲート回路１０に与えられ、ここで、割込同期信
号発生器１１からの信号を時間制御し、t6なる時
間幅の割込同期信号Ｊとして送信機１２へ送る。
送信機１２はこの信号Ｊにより変調をかけ、空中
線１３を介して送信する。 FIG. 2 is a block diagram showing the configuration of the master station transmitter side in an embodiment according to the present invention. In this figure, the output of the interrupt block pulse generator 3 is matched by the AND circuit 4 with the audio signal applied from the terminal 1 detected by the detector 2. This coincidence signal is given to the gate circuit 5, where:
time-controlling the signal from the interrupt permission signal generator 6;
Transmitter 12 as an interrupt permission signal with a time width of t5 .
send to The transmitter 12 modulates this signal and transmits it via the antenna 13. On the other hand, the output frequency of the interrupt clock pulse generator 3 is divided by the frequency divider 8 and is given to the AND circuit 9, where the output is obtained by inverting the polarity of the detection output of the detector 2 by the inverter circuit 7. A match is made with the output indicating that the call is not in progress. This coincidence signal is given to the gate circuit 10, which time-controls the signal from the interrupt synchronization signal generator 11 and sends it to the transmitter 12 as an interrupt synchronization signal J with a time width of t6 .
The transmitter 12 modulates this signal J and transmits it via the antenna 13.
第３図は本発明による実施例の２波プレストー
ク型子局無線機の構成を示すブロツク図である。
この図において、無通話時に親局から割込同期信
号Ｊによつて送信された電波は空中線１１４でう
けられ、アンテナスイツチ１１３をとおつて受信
機１１２により復調される。復調された割込同期
信号Ｊは割込同期信号検出器１０５により検出さ
れる。検出された信号Ｊはパルス発生器１０４に
加えられて発生パルスの位相がそろえられたの
ち、ゲート回路１０６に与えられ、ここで時間制
御される。そして、この時間制御された信号は、
結果的に通話時親局より送信される割込許可信号
と同期のとれたパルス信号となる。又、親局の
通話時には、空中線１１４およびアンテナスイツ
チ１１３をとおり、受信機１１２により復調され
た割込許可信号は割込許可信号検出器１０９に
より検出される。もし、割込用釦を押して割込を
要求すると、この割込許可信号と割込用釦によ
る信号入力端子１０３よりの信号との時間的一致
をアンド回路１１０により検出し、その一致信号
によつて送信機１０２およびアンテナスイツチ１
１３を起動する。これによつて、信号入力端子１
０１により入力される音声、もしくは信号が空中
線１１４より送信される。 FIG. 3 is a block diagram showing the configuration of a two-wave press-talk slave station radio according to an embodiment of the present invention.
In this figure, a radio wave transmitted by an interrupt synchronization signal J from a master station when there is no call is received by an antenna 114, passed through an antenna switch 113, and demodulated by a receiver 112. The demodulated interrupt synchronization signal J is detected by the interrupt synchronization signal detector 105. The detected signal J is applied to the pulse generator 104 to align the phases of the generated pulses, and then applied to the gate circuit 106 where it is time-controlled. And this time-controlled signal is
As a result, the pulse signal is synchronized with the interrupt permission signal transmitted from the master station during a call. Further, when the master station is talking, an interrupt permission signal that passes through the antenna 114 and the antenna switch 113 and is demodulated by the receiver 112 is detected by the interrupt permission signal detector 109. If the interrupt button is pressed to request an interrupt, the AND circuit 110 detects a time coincidence between this interrupt permission signal and the signal from the signal input terminal 103 from the interrupt button, and the coincidence signal is used. transmitter 102 and antenna switch 1
Start 13. With this, signal input terminal 1
01 is transmitted from the antenna 114.
もし、このプレストーク型子局が通話中のとき
は、割込用釦を押していないから、インバータ回
路１０７出力と、割込許可信号に同期のとれた
ゲート回路１０６の出力パルスＫとの時間的一致
がアンド回路１０８により検出され、その検出出
力にしたがつて一定時間間隔で強制的に送信が停
止される。したがつて、同時に通話中の子局と割
込んできた子局の電波とが同時に送出されること
なく、親局に対して割込みの緊急連絡をすること
ができる。 If this press-talk type slave station is busy, the interrupt button is not pressed, so the time difference between the inverter circuit 107 output and the output pulse K of the gate circuit 106 synchronized with the interrupt permission signal A match is detected by the AND circuit 108, and transmission is forcibly stopped at fixed time intervals according to the detection output. Therefore, the radio waves of the slave station that is currently talking and the slave station that has interrupted are not transmitted at the same time, and an emergency notification of interruption can be made to the master station.
第４図は、上記実施例において、親局とプレス
トーク型子局とが通話中のときに他の子局が割込
を要求した場合の動作をタイムチヤートにより示
したものである。この図を参照し、先ず、親局の
無線機内では割込クロツクパルス発生器３により
波形Ｆのように一定タイミングt3で繰り返しパル
スを発生させ、これと親局の通話者の送話中信号
Ｈ（例えば、音声信号を検出する）との論理積を
アンド回路４でとり、割込許可信号としてある
一定時間t5だけ親局の送信機１２から送信する。
T3およびt5の時間幅は実際の通話の種類により適
当に設定する。例えば、t3＝20秒、t5＝２秒とす
る。さらに、上記割込クロツクパルスＦを分周器
８で分周してインターバルt4（t4＝nt3、ｎ＝正の
整数）の繰り返しパルスＧをつくり、これと親局
の送話中でないことを示すインバータ７の出力と
の論理積をアンド回路９でとり、割込同期信号Ｊ
としてt6時間だけ親局の送信機１２から送信す
る。ｎは実際のシステムにより適当に設定する。
t6の時間幅は少なくとも子局で検出されるだけの
時間があればよい。例えば、t4＝200秒、t6＝0.5
秒とし、また、割込許可信号と割込同期信号Ｊ
はそれぞれトーン周波数を変えて区別する。 FIG. 4 is a time chart showing the operation in the above embodiment when another slave station requests an interruption while the master station and the press talk type slave station are talking. Referring to this figure, first, in the wireless device of the master station, an interrupt clock pulse generator 3 repeatedly generates a pulse at a constant timing t3 as shown in waveform F, and this is combined with a busy signal H of the caller of the master station. (For example, to detect an audio signal) is ANDed by the AND circuit 4 and transmitted from the transmitter 12 of the master station for a certain period of time t5 as an interrupt permission signal.
The time widths of T 3 and t 5 are set appropriately depending on the type of actual call. For example, let t 3 = 20 seconds and t 5 = 2 seconds. Furthermore, the frequency of the above-mentioned interrupt clock pulse F is divided by the frequency divider 8 to create a repeating pulse G with an interval t 4 (t 4 = nt 3 , n = a positive integer), and this pulse G is used to ensure that the master station is not transmitting. The AND circuit 9 performs a logical product with the output of the inverter 7 indicating the interrupt synchronization signal J.
The transmitter 12 of the master station transmits for t 6 hours. n is appropriately set depending on the actual system.
The time width of t 6 should be at least enough time for detection by the slave station. For example, t 4 = 200 seconds, t 6 = 0.5
seconds, and also the interrupt enable signal and interrupt synchronization signal J
are distinguished by changing the tone frequency.
一方、同時送受話方式の子局は通話中に割込許
可信号を検出した時間だけ、波形Ｌに示すよう
に送信を停止する。また、割込をかけるときは割
込用釦を押しているから、その条件と割込許可信
号を検出したことを論理積によりＭのタイミン
グで割込信号を送信する。 On the other hand, a slave station using the simultaneous transmission and reception system stops transmission as shown in waveform L for the time period when the interrupt permission signal is detected during a call. Furthermore, since the interrupt button is pressed when an interrupt is issued, the interrupt signal is transmitted at timing M by ANDing the condition and the detection of the interrupt enable signal.
他方、２波プレストーク型の子局では、無通話
時に親局から送られてくる割込同期信号Ｊの検出
の立ち上がりパルス発生回路１０４を制御し、t3
のタイミングに同期したクロツクパルス信号Ｋが
得られる。この方法により、親局における割込ク
ロツクパルスＦと２波プレストーク型子局におけ
るクロツクパルスＫとは時間的に一致した同一波
形となる。さらに、波形Ｎに示すごとく、このク
ロツクパルスＫによつて一定タイミングt3で繰返
す一定時間幅t5のパルスをつくり、これによつ
て、プレストーク型子局の通話時においても送信
をt3のタイミングで時間幅t5だけ繰返えし強制的
に停止することができる。 On the other hand, in a two-wave pre-talk type slave station, when there is no call, the rising edge pulse generation circuit 104 for detecting the interrupt synchronization signal J sent from the master station is controlled, and t 3
A clock pulse signal K synchronized with the timing of is obtained. With this method, the interrupt clock pulse F at the master station and the clock pulse K at the two-wave pre-talk type slave station have the same waveform that coincides in time. Furthermore, as shown in waveform N, this clock pulse K is used to create a pulse with a constant time width t5 that is repeated at a constant timing t3 , so that even when a pre-talk type slave station is talking, transmission can be performed at t3 . It is possible to force a stop by repeating the time width t 5 at the timing.
上記の実施例によれば、親局から割込許可信号
を送信している間は、２波プレストーク型子局
は割込用釦を押していない限り、必ず波形Ｎに示
すように送信を停止することになるので、他の子
局からの割込が可能となる。 According to the above embodiment, while the master station is transmitting an interrupt permission signal, the two-wave press talk slave station always stops transmission as shown in waveform N unless the interrupt button is pressed. Therefore, interrupts from other slave stations are possible.
以上の説明により明らかなように、本発明によ
れば、送信時には受信機として働かないプレスト
ーク型の子局でも、割込許可信号と同期するパル
ス信号を子局内部でつくることによつて、送信を
強制的に停止し、他の子局からの割込を混信なし
に確実に親局に知らせることができるから、移動
無線、特に列車無線のように緊急時の使用が要求
され、しかも同時送受話無線機とプレストーク型
無線機が混在する通信システムに適用して、割込
みに対する信頼性を向上すべく得られる効果は大
である。 As is clear from the above explanation, according to the present invention, even a pre-talk type slave station that does not function as a receiver during transmission can generate a pulse signal that is synchronized with the interrupt permission signal inside the slave station. Because it is possible to forcibly stop transmission and reliably notify the master station of interruptions from other slave stations without interference, it is required to be used in emergencies like mobile radios, especially train radios. The present invention can be applied to a communication system in which a transmitting/receiving radio device and a press-to-talk radio device coexist, and the effect of improving reliability against interruptions is significant.
第１図は従来の同時送受話方式による子局から
親局への割込み動作を説明するためのタイムチヤ
ート、第２図は本発明による実施例の親局送信機
側の構成を示すブロツク図、第３図は本発明によ
る実施例の２波プレストーク型子局無線機の構成
を示すブロツク図、第４図は、第２図および第３
図の実施例におけるプレストーク型子局から親局
への割込み動作を説明するためのタイムチヤート
である。
図において、１は音声信号入力端子、２は検出
器、３は割込クロツクパルス発生器、４，９はア
ンド回路、５，１０はゲート回路、６は割込許可
信号発生器、７はインバータ回路、８は分周器、
１１は割込同期信号発生器、１２は送信機、１３
は空中線、１０１は送信入力端子、１０２は送信
機、１０３は割込用釦による信号入力端子、１０
４はパルス発生器、１０５は割込同期信号検出
器、１０６はゲート回路、１０７はインバータ回
路、１０８，１１０はアンド回路、１０９は割込
許可信号検出器、１１１は受信出力端子、１１２
は受信機、１１４は空中線である。
FIG. 1 is a time chart for explaining an interrupt operation from a slave station to a master station according to the conventional simultaneous transmission and reception method, and FIG. 2 is a block diagram showing the configuration of the master station transmitter side in an embodiment according to the present invention. FIG. 3 is a block diagram showing the configuration of a two-wave press-talk type slave station radio according to an embodiment of the present invention, and FIG.
3 is a time chart for explaining an interrupt operation from a press-talk type slave station to a master station in the illustrated embodiment. In the figure, 1 is an audio signal input terminal, 2 is a detector, 3 is an interrupt clock pulse generator, 4 and 9 are AND circuits, 5 and 10 are gate circuits, 6 is an interrupt enable signal generator, and 7 is an inverter circuit. , 8 is a frequency divider,
11 is an interrupt synchronization signal generator, 12 is a transmitter, 13
is an antenna, 101 is a transmission input terminal, 102 is a transmitter, 103 is a signal input terminal using an interrupt button, 10
4 is a pulse generator, 105 is an interrupt synchronization signal detector, 106 is a gate circuit, 107 is an inverter circuit, 108 and 110 are AND circuits, 109 is an interrupt permission signal detector, 111 is a reception output terminal, 112
is a receiver, and 114 is an antenna.
Claims (1)
ク型の２種類が混在する複数の子局無線機との間
で選択的に通信を行なう無線通信方式において、
前記親局無線機には、該親局無線機が通話中でな
い時間に割込同期信号を該無線機から前記複数の
子局無線機に送出する手段を設け、前記複数の子
局無線機には、前記親局無線機からうけた割込同
期信号により、該割込同期信号よりインタバルが
短かく、かつ該割込同期信号に同期した連続タイ
ミングパルスを発生する手段を設けることによつ
て、割込発生時における通話中の子局無線機に対
して、該子局無線機内で発生した前記タイミング
パルスにより該子局無線機の送信を一定時間強制
停止するように制御することを特徴とした子局の
無線送信機制御方式。1 In a wireless communication system that selectively communicates between a master station radio and multiple slave station radios of two types: simultaneous transmission/reception type and press talk type.
The master station radio is provided with means for transmitting an interrupt synchronization signal from the radio to the plurality of slave station radios during a time when the master station radio is not busy, and By providing means for generating continuous timing pulses whose intervals are shorter than the interrupt synchronization signal and which are synchronized with the interrupt synchronization signal, using the interrupt synchronization signal received from the master station radio, The slave station radio device is controlled to forcibly stop the transmission of the slave station radio device for a certain period of time by the timing pulse generated within the slave station radio device during a call when an interrupt occurs. Wireless transmitter control method for slave stations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP510481A JPS57119528A (en) | 1981-01-19 | 1981-01-19 | Control system for radio transmitter of subordinate station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP510481A JPS57119528A (en) | 1981-01-19 | 1981-01-19 | Control system for radio transmitter of subordinate station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57119528A JPS57119528A (en) | 1982-07-26 |
| JPS6329861B2 true JPS6329861B2 (en) | 1988-06-15 |
Family
ID=11602051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP510481A Granted JPS57119528A (en) | 1981-01-19 | 1981-01-19 | Control system for radio transmitter of subordinate station |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57119528A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS513704A (en) * | 1974-06-28 | 1976-01-13 | Nippon Electric Co | MUSENTSUSHI NHOSHIKI |
-
1981
- 1981-01-19 JP JP510481A patent/JPS57119528A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS513704A (en) * | 1974-06-28 | 1976-01-13 | Nippon Electric Co | MUSENTSUSHI NHOSHIKI |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57119528A (en) | 1982-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS58131829A (en) | Radio relay system | |
| JPS62107542A (en) | Radio communication system | |
| EP0218450B2 (en) | Control system of a radio telephone apparatus | |
| US4062016A (en) | Simultaneous telecommunication between radio stations | |
| KR910008993A (en) | wireless telephone | |
| JPS6329861B2 (en) | ||
| JP3556936B2 (en) | Train radio system | |
| JPS6329860B2 (en) | ||
| JPS62230233A (en) | Radio telephone system | |
| NZ205661A (en) | Cardless telephone coupled by pcmtdm on swept carrier | |
| JP3241865B2 (en) | Multi-channel access wireless communication system and intermittent communication method thereof | |
| JP2653004B2 (en) | Wireless communication system | |
| JPH0753322Y2 (en) | Signal transmission control device in cordless telephone | |
| JPS6070875A (en) | Facsimile equipment | |
| JPH03131133A (en) | Radio communication equipment | |
| JPH05300078A (en) | Tdma frame synchronization method between zones | |
| JPS61242464A (en) | Facsimile signal transmitting system | |
| JPS62128626A (en) | Limiting system for duration of call in radio communication | |
| JPS6253527A (en) | Optical calling system in mobile radio system | |
| JPS6094543A (en) | Multiple address communication system | |
| JPH0234496B2 (en) | ||
| JPS6339173B2 (en) | ||
| JPH0334703B2 (en) | ||
| JPS60154743A (en) | Time division multiplex communication system | |
| JPH10200456A (en) | Radio relay system |