JPH0555948A - Communication equipment - Google Patents
Communication equipmentInfo
- Publication number
- JPH0555948A JPH0555948A JP3210790A JP21079091A JPH0555948A JP H0555948 A JPH0555948 A JP H0555948A JP 3210790 A JP3210790 A JP 3210790A JP 21079091 A JP21079091 A JP 21079091A JP H0555948 A JPH0555948 A JP H0555948A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- field strength
- electric field
- transmission power
- received
- 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
Classifications
-
- Y02B60/50—
Landscapes
- Transceivers (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は通信装置の送信電力制御
に関し、複数の送受信機のそれぞれがお互いの通話に必
要にしてかつ十分な送信電力で送信することにより、省
電化できると共に通話の盗聴を防止できる通信装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transmission power control of a communication device, in which a plurality of transmitters / receivers can transmit power with a transmission power that is necessary and sufficient for a call between them, thereby saving power and eavesdropping on the call. The present invention relates to a communication device that can prevent the above.
【0002】[0002]
【従来の技術】近年、電子機器の発達に伴い、個人用の
無線通信装置が急速に普及してきた。特にコードレス電
話機の普及にはめざましいものがあった従来、コードレ
ス電話機の送信電力制御については、常時一定の電力で
電波を送信しているものが多かった。すなわち、この種
のコードレス電話機は小電力コードレス電話機とも呼ば
れ、例えば、10mW(full power)の送信が標準規格
であった。2. Description of the Related Art In recent years, with the development of electronic devices, personal wireless communication devices have rapidly spread. In particular, in the conventional transmission power control of cordless telephones, which had a remarkable spread to the spread of cordless telephones, many of them always transmitted radio waves at a constant power. That is, this type of cordless telephone is also called a low power cordless telephone, and for example, transmission of 10 mW (full power) was the standard.
【0003】また、常時一定の電力で送信する送信電力
制御を行うコードレス電話機ばかりではなく、送信電力
を可変制御することのできるコードレス電話機もある。
この種のコードレス電話機では、通常相手電話機からの
受信電波の電界強度あるいは信号対雑音比を測定し、そ
の測定結果を相手電話機の送信電力制御のために相手電
話機に送信する。そして、相手電話機はその測定結果か
ら送信電力を制御するようにしていた。Further, there are not only cordless telephones that always control transmission power with constant power but also cordless telephones that can variably control transmission power.
In this type of cordless telephone, the electric field strength or the signal-to-noise ratio of the radio wave received from the other telephone is usually measured, and the measurement result is transmitted to the other telephone for controlling the transmission power of the other telephone. Then, the other party's telephone controls the transmission power based on the measurement result.
【0004】この場合、相手電話機からの受信電波の電
界強度あるいは信号対雑音比の測定は通話時における通
話信号を使用して行われる。また、その測定結果は自局
の通話信号を停止して送信することになる。そのため従
来のコードレス電話機では、相手電話機の送信電力制御
のための信号を送信する際は自局の通話信号の送信を停
止した上で行っていた。In this case, the measurement of the electric field strength or the signal-to-noise ratio of the radio wave received from the other party's telephone is performed by using the call signal during the call. The measurement result is transmitted by stopping the call signal of the own station. Therefore, in the conventional cordless telephone, when transmitting the signal for controlling the transmission power of the other telephone, the transmission of the call signal of the own station is stopped.
【0005】あるいは、自局の通話信号を停止させるこ
となく相手電話機の送信電力を制御するための測定結果
信号を送信できるコードレス電話機でも、通常は一定時
間毎に制御信号を送信するか、受信電波の電界強度ある
いは信号対雑音比に顕著な変化のあった場合にのみ送信
するか、あるいは通話開始時にのみ送信するかのいずれ
かであって、常時、前記測定結果信号を送信するものは
なかった。Alternatively, even in a cordless telephone capable of transmitting a measurement result signal for controlling the transmission power of the other telephone without stopping the call signal of its own station, normally, the control signal is transmitted at regular intervals or the received radio wave is received. Either only when there is a significant change in the electric field strength or the signal-to-noise ratio of the signal, or only when the call starts, there is no one that always transmits the measurement result signal. ..
【0006】[0006]
【発明が解決しようとする課題】上述のように、常時一
定の送信電力で電波を送信している従来のコードレス電
話機においては、親機、及び子機が至近距離で通話して
いるような場合であっても、送信電力は常に一定である
ので不必要に遠距離まで通話電波が送信されてしまい通
話内容が盗聴される危険があった。As described above, in the conventional cordless telephone which constantly transmits radio waves with a constant transmission power, when the master unit and the slave unit are talking at a short distance. However, since the transmission power is always constant, there is a risk that call radio waves are unnecessarily transmitted over a long distance and the content of the call is eavesdropped.
【0007】また、相手電話機の送信電力を制御するた
めの測定結果信号の送信の際は、自局の通話信号の送信
を停止する従来のコードレス電話機では、例えば、重要
な会話途中に不自然な中断が生じるなどの問題があっ
た。Further, in the case of transmitting the measurement result signal for controlling the transmission power of the other party's telephone, the conventional cordless telephone which stops the transmission of the call signal of its own station is unnatural during an important conversation, for example. There was a problem such as interruption.
【0008】さらに、一定時間毎に制御信号を送信す
る、受信電波の電界強度あるいは信号対雑音比に顕著な
変化のあった場合にのみ送信する、あるいは、通話開始
時にのみ送信するといった従来のコードレス電話機で
は、例えば、子機の移動により受信電波の電界強度ある
いは信号対雑音比が急速に低下した場合には、制御信号
の送信がなされないか、あるいはなされたとしても制御
が遅れ、通話品質が低下し、最悪の場合は通話が途切れ
ると言う問題点があった。Further, the conventional cordless system, in which a control signal is transmitted at regular intervals, is transmitted only when there is a significant change in the electric field strength of the received radio wave or the signal-to-noise ratio, or is transmitted only at the beginning of a call. In a telephone, for example, when the electric field strength of the received radio wave or the signal-to-noise ratio is rapidly reduced due to the movement of the child device, the control signal is not transmitted, or even if it is performed, the control is delayed and the communication quality is deteriorated. However, there was a problem that the call dropped in the worst case.
【0009】つまり、前述のように相手電話機からの受
信電波の電界強度あるいは信号対雑音比の測定は通話時
における通話信号を使用して行われる。また、その測定
結果は自局の通話信号と同時に送信する必要がある。し
かし、従来のコードレス電話機では、通話音声信号の送
信周波数帯域である可聴帯と呼ばれる300Hz〜3.
4KHzの帯域において、相手電話機の電力制御のため
の信号も同時に送信しようとしていたために、通話音声
信号と電力制御ための信号を一緒に送信することが出来
なかったのである。That is, as described above, the measurement of the electric field strength or the signal-to-noise ratio of the radio wave received from the other party's telephone is performed using the call signal during the call. Also, the measurement result must be transmitted at the same time as the call signal of the local station. However, in a conventional cordless telephone, a transmission frequency band of a call voice signal is 300 Hz to 3.
In the band of 4 KHz, since the signal for power control of the other telephone was also trying to be transmitted at the same time, the call voice signal and the signal for power control could not be transmitted together.
【0010】本発明は上記のような問題点を解消するた
めになされたもので、相手送受信機の電力制御のための
測定結果信号を音声信号の送信周波数帯域である可聴帯
とは別の帯域で送信することができ、音声信号と測定結
果信号を常時同時に送信することができ、送受信機のそ
れぞれがお互いの通話に必要にしてかつ十分な送信電力
で送信することができ、それによって省電化できると共
に電波の盗聴を防止できる通信装置を得ることを目的と
している。The present invention has been made to solve the above problems, and a measurement result signal for power control of a partner transceiver is transmitted in a band different from an audible band which is a transmission frequency band of a voice signal. , And the voice signal and the measurement result signal can be transmitted at the same time at all times, and each of the transmitters and receivers can transmit at the necessary and sufficient transmission power for each other's call, thereby saving electricity. It is an object of the present invention to provide a communication device that can prevent the wiretapping of radio waves.
【0011】[0011]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係わる通信装置は、相手送受信機からの受
信電波の電界強度あるいは信号対雑音比を測定する手段
と、前記手段により測定された電界強度あるいは信号対
雑音比を通話状態に影響を与えることなく通話信号と同
時に相手送受信機に送信する手段と、相手送受信機から
受信した前記電界強度あるいは信号対雑音比に基づき以
後の自局の送信電力を制御する手段とを備え、それぞれ
相手送受信機からの受信電波の電界強度あるいは信号対
雑音比に基づき自局の送信電力を制御・送信することを
特徴とするものである。In order to achieve the above object, a communication apparatus according to the present invention comprises means for measuring the electric field strength or signal-to-noise ratio of a radio wave received from a partner transceiver, and the means for measuring by the means. Means for transmitting the received electric field strength or signal-to-noise ratio to the partner transceiver at the same time as the call signal without affecting the call state, and the following automatic transmission based on the field strength or signal-to-noise ratio received from the partner transceiver. Means for controlling the transmission power of the station, and controls and transmits the transmission power of the own station based on the electric field strength or the signal-to-noise ratio of the radio wave received from the partner transceiver.
【0012】[0012]
【作用】従って、本発明の通信装置によれば、相手送受
信機の受信電波の電界強度あるいは信号対雑音比を測定
し、その測定結果信号を相手送受信機の電力制御のため
に音声信号の送信周波数帯域である可聴帯とは別の帯域
で送信することにより、音声信号と測定結果信号を常時
同時に送信することができる。そして、その測定結果信
号を受信し、電力制御信号を生成して以降の自局の送信
電力を制御し、常時通話に必要にしてかつ十分な送信電
力で送信できる。Therefore, according to the communication device of the present invention, the electric field strength or the signal-to-noise ratio of the reception radio wave of the partner transceiver is measured, and the measurement result signal is transmitted as a voice signal for power control of the partner transceiver. By transmitting in a band different from the audible band which is the frequency band, it is possible to always transmit the voice signal and the measurement result signal at the same time. Then, the measurement result signal is received, the power control signal is generated, the transmission power of the local station thereafter is controlled, and it is possible to transmit with the transmission power that is necessary and sufficient for continuous communication.
【0013】[0013]
【実施例】以下、本発明の一実施例を図について説明す
る。図1は本発明にかかる通信装置の一実施例であるコ
ードレス電話機の親機及び子機の構成を示すブロック図
である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a master unit and a slave unit of a cordless telephone which is an embodiment of a communication device according to the present invention.
【0014】図1において、本発明のコードレス電話機
の子機及び親機は、所定周波数の発呼信号、あるいは通
話信号等の電波を送受信するアンテナ10と、アンテナ
10から受信した電波をFM復調して内部信号に変換す
る受信回路(RX)11と、受信回路11から入力され
た内部信号の300Hz以下の信号をカットするハイパ
スフィルタ(HPF)12と、ハイパスフィルタ12か
ら出力される音声信号を音声に変換して操作者に発音す
るスピーカ(SP)13と、操作者の発音する音声を収
音し、音声信号に変換するマイク(MIC)14と、マ
イク14から入力される音声信号の300Hz以下の信
号をカットするハイパスフィルタ(HPF)15と、ハ
イパスフィルタ15からの音声信号と、後述する変調器
(MOD)18から出力される相手電話機からの受信電
波の電界強度を測定した結果である電界強度測定結果信
号を合成し、高周波処理してアンテナ10に送り出す送
信回路(TX)16と、受信回路11が受信した内部信
号から受信電波の電界強度を測定する電界強度測定回路
(MES)17と、電界強度測定回路17により検出さ
れた相手電話機からの受信電波の電界強度測定結果信号
を変調して送信回路16に出力する変調器(MOD)1
8と、受信回路11が受信した内部信号から300Hz
以上の信号をカットし、相手電話機が送信した電界強度
測定結果信号を抽出するローパスフィルタ(LPF)1
9と、ローパスフィルタ19によって抽出された相手電
話機からの電界強度測定結果信号を復調すると共に、以
降の自局の送信電力を制御する電力制御信号を生成する
復調器(DET)20と、復調器20により生成された
電力制御信号に基づき送信電力を制御する送信電力制御
回路(PC)21とから構成されている。Referring to FIG. 1, a cordless telephone of the present invention has a slave unit and a master unit, an antenna 10 for transmitting and receiving radio waves such as a calling signal of a predetermined frequency or a call signal, and FM demodulating the radio waves received from the antenna 10. Receiving circuit (RX) 11 that converts the internal signal into a high-pass filter (HPF) 12 that cuts the internal signal of the internal signal input from the receiving circuit 11 below 300 Hz, and the audio signal output from the high-pass filter 12 A speaker (SP) 13 which is converted into a sound and is sounded to an operator, a microphone (MIC) 14 which collects a sound sounded by the operator and converts the sound into a sound signal, and a sound signal of 300 Hz or less input from the microphone 14. A high-pass filter (HPF) 15 that cuts the signal of the above, an audio signal from the high-pass filter 15, and a modulator (MOD) 18 described later. An internal signal received by the transmission circuit (TX) 16 that receives the electric field intensity measurement result signal, which is the result of measuring the electric field intensity of the radio wave received from the other party's telephone, which is subjected to high frequency processing and is sent to the antenna 10, and the reception circuit 11. An electric field strength measurement circuit (MES) 17 for measuring the electric field strength of a received radio wave from a signal, and a field strength measurement result signal of the received electric wave from the partner telephone detected by the electric field strength measurement circuit 17 is modulated and output to the transmission circuit 16. Modulator (MOD) 1
8 and 300 Hz from the internal signal received by the receiving circuit 11
Low-pass filter (LPF) 1 that cuts the above signals and extracts the electric field strength measurement result signal transmitted by the other telephone
9, a demodulator (DET) 20 that demodulates the electric field strength measurement result signal from the partner telephone extracted by the low-pass filter 19 and also generates a power control signal that controls the transmission power of the local station thereafter, and a demodulator A transmission power control circuit (PC) 21 that controls the transmission power based on the power control signal generated by 20.
【0015】さらに、コードレス電話機の親機は、上記
各回路の他、コードレス電話機を電話回線に接続する2
線4線変換回路(HYB)22を構成している。Furthermore, the master unit of the cordless telephone connects the cordless telephone to the telephone line in addition to the above circuits.
A line-to-line conversion circuit (HYB) 22 is configured.
【0016】次に、上記の通り構成される本発明のコー
ドレス電話機において、相手電話機からの受信電波の電
界強度により自局の送信電力が制御される動作について
説明する。まず、発呼動作においては子機及び親機はそ
れぞれ最大出力、すなわち10mW(full power)で発
呼信号を送信回路16から出力する。Next, in the cordless telephone of the present invention configured as described above, the operation in which the transmission power of the own station is controlled by the electric field strength of the radio wave received from the partner telephone will be described. First, in the calling operation, the slave unit and the master unit each output the calling signal from the transmission circuit 16 at the maximum output, that is, 10 mW (full power).
【0017】例えば、子機が親機に発呼した場合、親機
はアンテナ10を介して子機の発呼信号を受信回路11
で受信し、子機との通話チャネルを確立する。そして、
親機は子機との通話チャネルを確立した後、以降の親機
の受信回路11で受信する子機からの受信電波の電界強
度を常時測定するように制御する。同様に、子機は親機
からの着呼完了信号を受信し、通話チャネルが確立され
たことを認識した後、以降の子機の受信回路11で受信
する親機からの受信電波の電界強度を常時測定するよう
に制御する。For example, when the slave unit makes a call to the master unit, the master unit receives the call signal of the slave unit via the antenna 10 and the receiving circuit 11
To establish a call channel with the handset. And
After establishing the communication channel with the slave, the master controls the receiving circuit 11 of the master thereafter to constantly measure the electric field strength of the radio wave received from the slave. Similarly, the slave unit receives the incoming call completion signal from the master unit, recognizes that the call channel has been established, and then receives the electric field strength of the radio wave received from the master unit by the receiving circuit 11 of the slave unit thereafter. Is controlled so that is always measured.
【0018】そして、以降の通話において子機及び親機
は、それぞれ受信回路11で受信した入力信号の内、音
声信号についてはハイパスフィルタ12で300Hz以
下の信号をカットした上でスピーカ13から音声に変換
して操作者に発音する。一方、入力信号は電界強度測定
回路17により電界強度が測定され、その電界強度測定
結果信号は連続的に変調器18に入力され、変調器18
は電界強度測定結果信号を300Hz以下の信号に変調
して送信回路16に入力する。Then, in the subsequent calls, the slave unit and the master unit cut out the input signals received by the receiving circuit 11 from the input signal received by the receiving circuit 11 by the high-pass filter 12 after cutting the signal of 300 Hz or less, and output the voice from the speaker 13. It is converted and pronounced by the operator. On the other hand, the electric field strength of the input signal is measured by the electric field strength measuring circuit 17, and the electric field strength measurement result signal is continuously input to the modulator 18, and the modulator 18
Modulates the electric field strength measurement result signal into a signal of 300 Hz or less and inputs it to the transmission circuit 16.
【0019】他方、スピーカ13から通話を受けた操作
者はマイク14を介して通話を行い、その音声信号はハ
イパスフィルタ15で300Hz以下の信号をカットし
た上で送信回路16に入力される。送信回路16では前
記変調器18からの300Hz以下の電界強度測定結果
信号と、ハイパスフィルタ15からの300Hz以下の
信号部分をカットされた音声信号とを合成し、アンテナ
10を介して相手電話機に送信する。On the other hand, an operator who receives a call from the speaker 13 makes a call through the microphone 14, and the voice signal thereof is cut into a signal of 300 Hz or less by the high-pass filter 15 and then input to the transmission circuit 16. The transmitting circuit 16 synthesizes the electric field strength measurement result signal of 300 Hz or less from the modulator 18 and the audio signal from which the signal portion of 300 Hz or less from the high-pass filter 15 is cut, and transmits it to the other telephone through the antenna 10. To do.
【0020】そして、相手電話機は前記電界強度測定結
果信号と音声信号とが合成された通話信号を受信回路1
1で受信し、上述の動作を行うと共に受信回路11から
出力される入力信号をローパスフィルタ19により30
0Hz以上の信号をカットする。すなわち、前記通話信
号から音声信号の部分を取り除き相手電話機からの電界
強度測定結果信号のみ抽出した上で復調器20に入力す
る。復調器20では、抽出された電界強度測定結果信号
を復調し、自局の送信電力を制御する電力制御信号を生
成する。復調器20により生成された電力制御信号は電
力制御回路21に入力され、電力制御回路21は送信回
路16の送信電力を制御する。Then, the receiving telephone set 1 receives the call signal in which the electric field strength measurement result signal and the voice signal are combined.
1 to perform the above-mentioned operation and the input signal output from the receiving circuit 11 to 30 by the low-pass filter 19.
Cut off signals above 0 Hz. That is, the voice signal portion is removed from the call signal, and only the electric field strength measurement result signal from the partner telephone is extracted and input to the demodulator 20. The demodulator 20 demodulates the extracted electric field strength measurement result signal and generates a power control signal for controlling the transmission power of the local station. The power control signal generated by the demodulator 20 is input to the power control circuit 21, and the power control circuit 21 controls the transmission power of the transmission circuit 16.
【0021】送信回路16は送信電力制御回路(PC)
21の制御に従い、前記変調器18からの300Hz以
下の電界強度測定結果信号と、ハイパスフィルタ15か
らの300Hz以下の信号部分をカットされた音声信号
とを合成し、アンテナ10を介して相手電話機に送信す
る。従って、本発明のコードレス電話機では上述の動作
が通話チャネルが切断されるまで継続され、子機が操作
者の移動に伴って親機から遠隔されて親機の受信電波の
電界強度が弱まった場合でも、子機はその親機から送信
される電界強度測定結果信号に基づいて送信電力を制御
するので、子機は常に適当な送信電力に修正されること
になる。The transmission circuit 16 is a transmission power control circuit (PC).
According to the control of 21, the electric field strength measurement result signal of 300 Hz or less from the modulator 18 and the voice signal from which the signal portion of 300 Hz or less from the high-pass filter 15 is cut are combined, and the result is transmitted to the other telephone through the antenna 10. Send. Therefore, in the cordless telephone of the present invention, the above operation is continued until the call channel is cut off, and when the handset is moved away from the base unit as the operator moves, the electric field strength of the received radio wave of the base unit weakens. However, since the slave unit controls the transmission power based on the electric field strength measurement result signal transmitted from the master unit, the slave unit is always corrected to an appropriate transmission power.
【0022】このように、本発明のコードレス電話機で
は相手電話機からの受信電波の電界強度を測定して、そ
の電界強度測定結果信号を音声信号の送信周波数帯域と
は別の帯域で送信することにより、音声信号と測定結果
信号を常時同時に送信することができ、その測定結果信
号を受信した相手電話機は、その測定結果信号より電力
制御信号を生成して以降の自局の送信電力を制御し、常
時通話に必要にしてかつ十分な送信電力で送信できるよ
うになるのである。つまり、受信電波の電界強度が弱い
場合は送信電力を上げ、電界強度が強い場合は送信電力
を下げる。As described above, in the cordless telephone of the present invention, the electric field strength of the radio wave received from the partner telephone is measured and the electric field strength measurement result signal is transmitted in a band different from the transmission frequency band of the voice signal. , A voice signal and a measurement result signal can be transmitted at the same time at all times, and the receiving telephone receiving the measurement result signal generates a power control signal from the measurement result signal to control the transmission power of its own station thereafter. It becomes possible to transmit with a sufficient transmission power that is necessary for continuous calls. That is, the transmission power is increased when the electric field strength of the received radio wave is weak, and the transmission power is decreased when the electric field strength is strong.
【0023】なお、本発明のコードレス電話機では、通
話チャネルが確立される以前の待機中はアンテナ10か
ら受信される受信電波があっても、受信回路11から受
信信号が出力されることはないので、復調器20に相手
電話機からの電界強度測定結果信号が入力されることは
なく、また電界強度測定回路17は受信電波の電界強度
を変調器18に出力することもない。In the cordless telephone of the present invention, the reception circuit 11 does not output a reception signal even if there is a reception radio wave received from the antenna 10 during standby before the call channel is established. The electric field strength measurement result signal from the other party's telephone is not input to the demodulator 20, and the electric field strength measuring circuit 17 does not output the electric field strength of the received radio wave to the modulator 18.
【0024】また、上記実施例では自局の送信電力の制
御は、相手電話機からの受信電波の電界強度測定結果信
号によって行ったが、相手電話機からの受信電波の信号
対雑音比によって行うこともできる。図2(a)は、本
発明のコードレス電話機における電界強度測定回路17
の構成を示すブロック図であり、また図2(b)はその
代替回路である受信電波の信号対雑音比測定回路の構成
を示すブロック図である。Further, in the above embodiment, the control of the transmission power of the own station is performed by the electric field strength measurement result signal of the radio wave received from the partner telephone, but it may also be controlled by the signal-to-noise ratio of the radio wave received from the partner telephone. it can. FIG. 2A shows an electric field strength measuring circuit 17 in the cordless telephone of the present invention.
2B is a block diagram showing the configuration of a signal-to-noise ratio measuring circuit for received radio waves, which is an alternative circuit thereof.
【0025】さらに、上記実施例では電界強度測定結果
信号と音声信号を同時に送信する方法として、電界強度
測定結果信号を300Hz以下の周波数で、すなわち通
話音声信号の送信周波数帯域である300Hz〜3.4
KHzの帯域外の周波数で、300Hz以下の信号部分
をカットした音声信号と合成する方法で説明した。しか
し、電界強度測定結果信号と音声信号を同時に送信する
方法はそれに限られるものではなく、例えば、音声信号
をFM方式で変調し、電界強度測定結果信号をAM方式
で変調して合成することによっても可能であるし、ま
た、電界強度測定結果信号を音声信号の送信周波数帯域
である3.4KHzを越えた周波数で変調して送信する
ことによっても可能であることは明かである。Further, in the above embodiment, as a method for simultaneously transmitting the electric field strength measurement result signal and the voice signal, the electric field strength measurement result signal is transmitted at a frequency of 300 Hz or less, that is, 300 Hz to 3. Four
The method of synthesizing with a voice signal obtained by cutting a signal portion of 300 Hz or less at a frequency outside the band of KHz has been described. However, the method of transmitting the electric field strength measurement result signal and the voice signal at the same time is not limited to that. For example, the voice signal is modulated by the FM method, and the electric field strength measurement result signal is modulated by the AM method and combined. It is obvious that it is also possible by modulating the electric field strength measurement result signal at a frequency exceeding 3.4 KHz which is the transmission frequency band of the voice signal and transmitting the signal.
【0026】[0026]
【発明の効果】以上説明したように、本発明にかかる通
信装置によれば、相手送受信機からの受信電波の電界強
度あるいは信号対雑音比により自局の送信電力をリアル
タイムに、かつ連続的に制御するように構成したので、
子機及び親機のそれぞれがお互いの通話に必要にしてか
つ十分な送信電力で送信でき、省電化できると共に電波
の盗聴を防止できるという効果がある。As described above, according to the communication device of the present invention, the transmission power of the local station is continuously and continuously in real time by the electric field strength of the radio wave received from the partner transceiver or the signal-to-noise ratio. I configured it to control,
Each of the child device and the parent device can transmit with sufficient transmission power that is necessary and necessary for the mutual call, and there is an effect that it is possible to save electricity and prevent eavesdropping of radio waves.
【0027】また、電界強度測定結果信号と音声信号は
独立して同時に送信されるように構成したので、電界強
度測定結果信号の送信のために通話信号が途切れること
が無いという効果がある。Further, since the electric field strength measurement result signal and the voice signal are independently and simultaneously transmitted, there is an effect that the call signal is not interrupted due to the transmission of the electric field strength measurement result signal.
【図1】本発明の一実施例を示すコードレス電話機のブ
ロック図である。FIG. 1 is a block diagram of a cordless telephone showing an embodiment of the present invention.
【図2】本発明のコードレス電話機における電界強度測
定回路17及びその代替回路である受信電波の信号対雑
音比測定回路の構成を示すブロック図である。FIG. 2 is a block diagram showing a configuration of a field strength measuring circuit 17 and a signal-to-noise ratio measuring circuit of a received radio wave which is an alternative circuit thereof in the cordless telephone of the present invention.
10 アンテナ 11 受信回路 12,15 ハイパスフィルタ 13 スピーカ 14 マイク 16 送信回路 17 電界強度測定回路 18 変調器 19 ローパスフィルタ 20 復調器 21 送信電力制御回路 22 2線4線変換回路 DESCRIPTION OF SYMBOLS 10 antenna 11 receiving circuit 12,15 high-pass filter 13 speaker 14 microphone 16 transmitting circuit 17 electric field strength measuring circuit 18 modulator 19 low-pass filter 20 demodulator 21 transmission power control circuit 22 2-wire 4-wire conversion circuit
Claims (2)
信装置において、 送受信機間の受信電波の電界強度あるいは信号対雑音比
を測定する手段と、 前記手段により測定された電界強度あるいは信号対雑音
比を通話状態に影響を与えることなく通話信号と同時に
相手受信機に送信する手段と、 相手送信機から受信した相手受信機で受信されている自
局の電界強度あるいは、信号対雑音比に基づき以後の自
局の送信電力を制御する手段と、 を備え、 前記複数の送受信機の各々が相手送信機から受信した相
手受信機で受信されている自局の電界強度あるいは信号
対雑音比に基づき、自局の送信電力を連続的に制御し、
送信することを特徴とする通信装置。1. In a communication device in which a plurality of transceivers are connected by a wireless line, means for measuring the electric field strength or signal-to-noise ratio of received radio waves between the transmitters and receivers, and the electric field strength or signal pair measured by the means. A method of transmitting the noise ratio to the receiver at the same time as the call signal without affecting the call state, and the electric field strength of the own station received by the receiver of the receiver received from the transmitter or the signal-to-noise ratio. Based on the following means for controlling the transmission power of the local station, each of the plurality of transceivers received from the partner transmitter to the field strength or signal-to-noise ratio of the own station received by the partner receiver Based on this, continuously control the transmission power of its own station,
A communication device characterized by transmitting.
送受信機がコードレス電話機の親機と子機である通信装
置。2. The communication device according to claim 1, wherein the transceiver is a master unit and a slave unit of a cordless telephone.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3210790A JPH0555948A (en) | 1991-08-22 | 1991-08-22 | Communication equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3210790A JPH0555948A (en) | 1991-08-22 | 1991-08-22 | Communication equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0555948A true JPH0555948A (en) | 1993-03-05 |
Family
ID=16595177
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3210790A Pending JPH0555948A (en) | 1991-08-22 | 1991-08-22 | Communication equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0555948A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07336291A (en) * | 1994-06-07 | 1995-12-22 | Nec Corp | Transmission output controller in mobile communication |
US7319884B2 (en) | 2003-12-02 | 2008-01-15 | Matsushita Electric Industrial Co., Ltd. | FM radio device and transmission power control method |
KR102216839B1 (en) * | 2019-09-06 | 2021-02-17 | 이상섭 | Communication system for mechanized vehicle using wireless communication |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56110355A (en) * | 1980-02-05 | 1981-09-01 | Nec Corp | Radio communication system |
JPS63121328A (en) * | 1986-11-11 | 1988-05-25 | Sanyo Electric Co Ltd | Transmission power controller for cordless telephone set |
JPH02280420A (en) * | 1989-04-20 | 1990-11-16 | Fujitsu General Ltd | Communication method for radio communication equipment |
-
1991
- 1991-08-22 JP JP3210790A patent/JPH0555948A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56110355A (en) * | 1980-02-05 | 1981-09-01 | Nec Corp | Radio communication system |
JPS63121328A (en) * | 1986-11-11 | 1988-05-25 | Sanyo Electric Co Ltd | Transmission power controller for cordless telephone set |
JPH02280420A (en) * | 1989-04-20 | 1990-11-16 | Fujitsu General Ltd | Communication method for radio communication equipment |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07336291A (en) * | 1994-06-07 | 1995-12-22 | Nec Corp | Transmission output controller in mobile communication |
US7319884B2 (en) | 2003-12-02 | 2008-01-15 | Matsushita Electric Industrial Co., Ltd. | FM radio device and transmission power control method |
KR102216839B1 (en) * | 2019-09-06 | 2021-02-17 | 이상섭 | Communication system for mechanized vehicle using wireless communication |
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