JPS63121328A - Transmission power controller for cordless telephone set - Google Patents

Transmission power controller for cordless telephone set

Info

Publication number
JPS63121328A
JPS63121328A JP26802786A JP26802786A JPS63121328A JP S63121328 A JPS63121328 A JP S63121328A JP 26802786 A JP26802786 A JP 26802786A JP 26802786 A JP26802786 A JP 26802786A JP S63121328 A JPS63121328 A JP S63121328A
Authority
JP
Japan
Prior art keywords
circuit
signal
transmission power
level
transmitted power
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
JP26802786A
Other languages
Japanese (ja)
Inventor
Yuichi Suetsugu
末次 裕一
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP26802786A priority Critical patent/JPS63121328A/en
Publication of JPS63121328A publication Critical patent/JPS63121328A/en
Pending legal-status Critical Current

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  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE:To satisfactorily control transmitted power by increasing the power level of a transmission circuit so as to transmit a power up code signal from a micro computer to a master machine side and decoding the signal received on the master side to drive the transmission circuit when the detection output of the slave machine side lowers. CONSTITUTION:If the slave machine is separated from the master machine, there are many noises and the output from a detection circuit 16 becomes in low level. Hereupon, a transistor TR 17 for controlling transmitted power is made to be in an ON state and a driving voltage is impressed on the transmission circuit 11 through the emitter.collector of the TR 17, so that the transmitted power level becomes high. When a low level signal outputted from the circuit 16 is impressed on the micro computer 12 the computer 12 impresses the code signal which indicates the transmitted power up on a pilot signal outgoing circuit 13 and the encoded pilot signal is modulated in the circuit 11, then transmitted to the master machine side. And the pilot signal is decoded 22 on the master machine side and the low level signal is outputted from the micro computer 25 to the base of the TR 25 for controlling transmitted power so as to drive the transmission circuit 24.

Description

【発明の詳細な説明】 イ、B業上の利用分野 本発明はコードレス電話機の送信電力制御装置に関する
DETAILED DESCRIPTION OF THE INVENTION A. B Field of Application The present invention relates to a transmission power control device for a cordless telephone.

口、従来の技術 電話回線に接続された親機と、この親機と無線にて接続
された子機とよりなるコードレス電話機は周知である。
BACKGROUND OF THE INVENTION Cordless telephones comprising a base unit connected to a telephone line and a slave unit wirelessly connected to the base unit are well known.

ところで、斯かるコードレス電話機に於いて、子機が親
機よシ離れすぎると、良好な通話を行うことができない
。その為、特開昭55−162639号(HO4B7/
26)には、子機側に子機が通話可能範囲内にいるか否
か表示する手段を設け、子機側に於いて通話可能範囲内
を知り得る構成とした技術が開示されている。
By the way, in such a cordless telephone, if the slave unit is too far away from the base unit, it will not be possible to make good calls. Therefore, JP-A-55-162639 (HO4B7/
No. 26) discloses a technique in which a handset is provided with a means for displaying whether or not the handset is within a callable range, so that the handset can know whether the handset is within the callable range.

ハ1発明が解決しようとする問題点 本発明は子機の親機よりの離n具合に応じて送信電力を
制御することにより、常時良好な通話が可能となるよう
にぜんとするものである。
C1 Problems to be Solved by the Invention The present invention is designed to ensure that a good call can be made at all times by controlling the transmission power according to the distance of the handset from the base unit. .

二0問題点を解決する為の手段 相手方より送信される送信信号のレベルを検出するレベ
ル検出回路と、このレベル検出回路の出力により制御さ
れる送信電力制御回路を設ける構成とする。
20. Means for Solving Problems The present invention is configured to include a level detection circuit that detects the level of a transmission signal transmitted from the other party, and a transmission power control circuit that is controlled by the output of this level detection circuit.

ホ6作 用 レベル検出回路により送信信号のレベルが低いことが検
出された場合には送信電力が増大するように、またレベ
ルが高いことが検出された場合には送信電力を減少させ
るように送信電力制御回路を制御することによシ、常時
良好な通話をすることができる。
E6 Effect When the level detection circuit detects that the level of the transmission signal is low, the transmission power is increased, and when the level is detected to be high, the transmission power is decreased. By controlling the power control circuit, it is possible to make good calls at all times.

へ、実施例 第2図に示す子機に於いて、親機よシ送信される送信信
号はアンテナ(1)にて受信さn、受信回路(2)によ
シ復調される。復調された信号はレベル検出回路(31
及び増幅回路(4)に印加される。増幅回路(4)の出
力はスピーカ(5)に接続さnており以って親機より送
信された信号C外線からの通話信号)は子機のスピーカ
(5)より放音される。一方、子機のマイクロフォン(
6)より入力された通話信号は増幅回路(5)にて増幅
された後、変調回路(7)、RF増幅回路(8)、送信
電力増幅用トランジスタ(91、マツチングコイル(l
lt−含む送信回路(1)1に印加されて変調され、ア
ンテナ(1)t−経て親機側に送信される。
Embodiment In the slave unit shown in FIG. 2, a transmission signal transmitted from the base unit is received by an antenna (1) and demodulated by a receiving circuit (2). The demodulated signal is sent to a level detection circuit (31
and is applied to the amplifier circuit (4). The output of the amplifier circuit (4) is connected to a speaker (5), so that the signal C transmitted from the base unit (call signal from the outside line) is emitted from the speaker (5) of the slave unit. On the other hand, the handset's microphone (
6) The telephone call signal input from
It is applied to the transmitting circuit (1) 1 including lt-, is modulated, and is transmitted to the base unit side via the antenna (1) t-.

第1図に於いて示す親機に於いて、子機より送信される
送信信号はアンテナ醸にて受信され、受信回路(21)
により復調される。復調された信号はパイロット信号デ
コード回路の及び増幅・ハイブリッドトランス回路のに
印加される。増幅・ハイブリッドトランス回路ツの出力
側は電話回路に接続さnており、以りて子機よυ送信さ
れた通話信号は電話回線に送出されることになる。一方
、電話回線よシ到来した通話信号は増幅・ハイブリッド
トランス回路のを経て送信回路e41に入力され、以っ
てアンテナ■よシ子機側に送信される。
In the base unit shown in Fig. 1, the transmission signal transmitted from the slave unit is received by the antenna, and the receiving circuit (21)
It is demodulated by The demodulated signal is applied to a pilot signal decoding circuit and an amplification/hybrid transformer circuit. The output side of the amplification/hybrid transformer circuit is connected to the telephone circuit, so that the speech signal transmitted from the handset is sent to the telephone line. On the other hand, a call signal arriving from the telephone line is inputted to the transmitting circuit e41 via the amplification/hybrid transformer circuit, and is then transmitted to the handset side through the antenna (2).

ところで、子機より外線に対して電話をする場合、マイ
クロコンピュータ化よシ特別なコード(セdPユリティ
コードと称される)が出力さn、このコードによりパイ
ロット信号発振回路0が制御さn、パイロット信号がエ
ンコードされる。エンコードされたパイロット信号は送
信回路(illに印加さn1以つて親機側に送信される
。親機側に於いて受信されたエンコードパイロット信号
はパイロット信号デコード回路のにてデコードされる。
By the way, when making a call to an outside line from a handset, a special code (called a SEDP utility code) is output by the microcomputer, and this code controls the pilot signal oscillation circuit 0. , the pilot signal is encoded. The encoded pilot signal is applied to the transmitting circuit (ill) and transmitted to the base unit side. The encoded pilot signal received at the base unit side is decoded by the pilot signal decoding circuit.

デコード化され次コード信号はマイクロコンピュータら
に印加さn、そのコードが所定のコードであるか否か判
断される。所定コードである場合にはマイクロコンピュ
ータ■からの指示信号により増幅・ハイブリッドトラン
ス回路のが駆動状態になシ、子機よシ親機を介して外線
に電話することが可能となる。
The decoded next code signal is applied to a microcomputer, etc., and it is determined whether the code is a predetermined code or not. If the code is a predetermined code, the amplification/hybrid transformer circuit is turned off by an instruction signal from the microcomputer (2), and the handset can make a call to an outside line via the base unit.

さて、本発明の#徴は、子機側に設けた送信信号のレベ
ル検出回路(3)にある。このレベル検出回路(3)は
送イ6信号中のノイズ成分を検出する構成となってSジ
、所謂スケルチ回路となつている。レベル検出回路(3
)はノイズフィルタ(141(例えば5KHz以上のノ
イス’t−a出するフィルタ)、増幅回路(LSI及び
検波回路部よりなる。
Now, the feature # of the present invention lies in the transmission signal level detection circuit (3) provided on the handset side. This level detection circuit (3) is configured to detect noise components in the sending signal, and is a so-called squelch circuit. Level detection circuit (3
) consists of a noise filter (141 (for example, a filter that emits noise of 5 KHz or higher), an amplifier circuit (LSI, and a detection circuit section).

もし、子機が親機の近くにあれば、ノイズは少なく、こ
のとき検波回路αθの出力がハイジベルとなるものとす
る。すると、このハイレベル出力により送信電力制御用
トランジスJanはオフ状態となる。従って、送信電力
増幅用トランジスタ(9)には送信電力制限抵抗(18
1を介して駆動1圧が印加さn、送信′框カレベルは通
常レベル状態にあるat之、このとき、親機には同等制
御信号は送出さnず、親機側の送信電力制御用トランジ
スタ■もオフ状態にあり、Σ動電圧は送信電力制限抵抗
罰金弁して印加さn親機側の送信回路(241の送信電
力レベルも通常レベル状態にある。
If the slave device is near the parent device, there will be less noise, and in this case, the output of the detection circuit αθ will be high-level. Then, the transmission power control transistor Jan is turned off due to this high level output. Therefore, the transmission power limiting resistor (18) is connected to the transmission power amplifying transistor (9).
1, and the transmission power level is at the normal level.At this time, no equivalent control signal is sent to the base unit, and the transmission power control transistor on the base unit side (2) is also in the off state, and the Σ dynamic voltage is applied through the transmission power limiting resistor fine valve, and the transmission power level of the transmission circuit (241) on the base unit side is also in the normal level state.

一方、子機が親機より離れている場合にはノイズが多く
、検波回路帥の出力はa−レベルとなる。
On the other hand, if the slave unit is located further away from the master unit, there will be a lot of noise, and the output of the detection circuit will be at the A-level.

すると、送信電力制御用トランジスタ([71がオン状
態となり、原動電圧はこのトランジスタ任9のエミッタ
・コレクタを介して送信回路allに印加され、以って
送信電力増幅用トランジスタ(9)には十分な駆動電圧
が印加され、送信電力レベルは大きくなる。また、検波
回路(16+より出力されるローレベル信号がマイクロ
コンピュータC121に印加されると、マイクロコンピ
ュータazより送信電力アップを指示するコード信号が
パイロット信号発振回路α3に印加され、コード化され
たパイロット信号が送信回路αBにて変調されて親機側
に送信される。そして親機側のパイロット信号デコード
回路のにてこの信号がデコードさn、このデコード信号
がマイクロコンビエータ(至)K印加されると、マイク
ロコンピュータ(ハ)より、送信電力制御用トランジス
タ(至)のべ〒スに対してローレベル信号が出力され、
以ってこのトランジスタ■がオン状態となり、送信回路
(241に対して十分な、駆!IEI+電圧が印加され
、送Qlt力は増大する。
Then, the transmission power control transistor (71) is turned on, and the driving voltage is applied to the transmission circuit all via the emitter-collector of this transistor (9), which is sufficient for the transmission power amplification transistor (9). A driving voltage is applied, and the transmission power level increases.Also, when the low level signal output from the detection circuit (16+) is applied to the microcomputer C121, a code signal instructing to increase the transmission power is sent from the microcomputer az. The coded pilot signal applied to the pilot signal oscillation circuit α3 is modulated by the transmitting circuit αB and transmitted to the base unit.This signal is then decoded by the pilot signal decoding circuit on the base unit. , When this decoded signal is applied to the micro combinator (to) K, the microcomputer (c) outputs a low level signal to the base of the transmission power control transistor (to),
As a result, this transistor (2) turns on, and a sufficient voltage is applied to the transmitting circuit (241), increasing the transmitting Qlt force.

以上述べ九実施例に於いては、子機側にレベル検出口路
(31t−設けたが、逆に親機側に設けても良い。ま九
、レベル検出回路(31を両方に設ける構成した場合に
は子機から親機(又はその逆)に対して送信電力アップ
を指示するコード信号を送信する必要はない。
In the nine embodiments described above, the level detection circuit (31t) is provided on the slave unit side, but it may be provided on the base unit side. In this case, there is no need to transmit a code signal from the handset to the base (or vice versa) instructing to increase the transmission power.

ト0発明の効果 以上述べた本発明に依nば、子機と8機の距離に応じて
適切な送信電力が維持され、ノイズのない艮好な通話音
実現できる。また、子機と親機が近くにある場合には送
信電力が不必要に大きくなることはなく、子機の電池の
消耗金抑えることができ、更に他のコードレス電話機に
て通話を傍受されることもない。
Effects of the Invention According to the present invention described above, an appropriate transmission power is maintained depending on the distance between the handset and the handset, and it is possible to realize a clear call tone without noise. In addition, if the handset and base unit are close to each other, the transmission power will not be increased unnecessarily, reducing battery consumption of the handset and preventing calls from being intercepted by other cordless phones. Not at all.

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

図面は何れも本発明に係るコードレス電話機を示すもの
であり、第1図は親機を示す図、槙2図は子機を示す図
である。 +21(21)は受信回路、 (3)はレベル検出回路
、 (1)1Q41は送信回路、 α71■は送信゛電
力制御用トランジス4(送信電力制御回路)
The drawings all show a cordless telephone according to the present invention; FIG. 1 shows a base unit, and FIG. 2 shows a slave unit. +21 (21) is the receiving circuit, (3) is the level detection circuit, (1) 1Q41 is the transmitting circuit, α71■ is the transmitting power control transistor 4 (transmitting power control circuit)

Claims (1)

【特許請求の範囲】[Claims] (1)電話回線に接続された親機と、この親機と無線に
て接続された子機とよりなるコードレス電話機の送信電
力制御装置で、 相手方より送信される送信信号のレベルを検出するレベ
ル検出回路と前記レベル検出回路の出力により制御され
る送信電力制御回路を有することを特徴とするコードレ
ス電話機の送信電力制御装置。
(1) The level at which the transmission power control device of a cordless telephone, which consists of a base unit connected to a telephone line and a slave unit wirelessly connected to the base unit, detects the level of the transmission signal sent from the other party. 1. A transmission power control device for a cordless telephone, comprising a detection circuit and a transmission power control circuit controlled by the output of the level detection circuit.
JP26802786A 1986-11-11 1986-11-11 Transmission power controller for cordless telephone set Pending JPS63121328A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26802786A JPS63121328A (en) 1986-11-11 1986-11-11 Transmission power controller for cordless telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26802786A JPS63121328A (en) 1986-11-11 1986-11-11 Transmission power controller for cordless telephone set

Publications (1)

Publication Number Publication Date
JPS63121328A true JPS63121328A (en) 1988-05-25

Family

ID=17452870

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26802786A Pending JPS63121328A (en) 1986-11-11 1986-11-11 Transmission power controller for cordless telephone set

Country Status (1)

Country Link
JP (1) JPS63121328A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0323725A (en) * 1989-06-20 1991-01-31 Matsushita Electric Ind Co Ltd Mobile radio communication equipment
JPH0555948A (en) * 1991-08-22 1993-03-05 Rohm Co Ltd Communication equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6143026A (en) * 1984-08-06 1986-03-01 Nippon Telegr & Teleph Corp <Ntt> System for controlling and transmitting received electric field

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6143026A (en) * 1984-08-06 1986-03-01 Nippon Telegr & Teleph Corp <Ntt> System for controlling and transmitting received electric field

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0323725A (en) * 1989-06-20 1991-01-31 Matsushita Electric Ind Co Ltd Mobile radio communication equipment
JPH0555948A (en) * 1991-08-22 1993-03-05 Rohm Co Ltd Communication equipment

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