JPH03226029A - Selective radio call receiver - Google Patents
Selective radio call receiverInfo
- Publication number
- JPH03226029A JPH03226029A JP2032990A JP2032990A JPH03226029A JP H03226029 A JPH03226029 A JP H03226029A JP 2032990 A JP2032990 A JP 2032990A JP 2032990 A JP2032990 A JP 2032990A JP H03226029 A JPH03226029 A JP H03226029A
- Authority
- JP
- Japan
- Prior art keywords
- radio
- section
- speaker
- power supply
- vibrator
- 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
- 238000001514 detection method Methods 0.000 claims description 12
- 230000010355 oscillation Effects 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 230000006866 deterioration Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野コ
本発明は、無線選択呼出受信機に関し、特に直交検波方
式を用いた無線選択呼出受信機に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a radio selective call receiver, and more particularly to a radio selective call receiver using an orthogonal detection method.
[従来の技術]
従来の無線選択呼出受信機は、小型化の要求に応えるた
めに直交検波方式が採用されることが多かった。この直
交検波方式を用いた無線部の回路を第3図に示す。第3
図において、301はミキサ回路、302はチャンネル
フィルタ、303はリミッタ回路、304は復調回路、
305は波形整形回路、306は90度移相器、307
は局部発振回路である。[Prior Art] Conventional radio selective calling receivers have often adopted an orthogonal detection method in order to meet the demand for miniaturization. FIG. 3 shows a circuit of a radio section using this orthogonal detection method. Third
In the figure, 301 is a mixer circuit, 302 is a channel filter, 303 is a limiter circuit, 304 is a demodulation circuit,
305 is a waveform shaping circuit, 306 is a 90 degree phase shifter, 307
is a local oscillator circuit.
直交検波方式を用いると、局部発振周波数と回線周波数
が等しいために中間周波数が零となる。When the orthogonal detection method is used, the intermediate frequency becomes zero because the local oscillation frequency and the line frequency are equal.
このため、イメージ周波数が存在せず、高周波増幅器お
よび中間周波増幅器においてフィルタが不要となり、小
型化に適している。また、第3図に示すチャンネルフィ
ルタ302は、中間周波数が零であることから、低周波
のアクティブフィルタで構成でき、集積回路上に実現可
能であり、小型化に適している。Therefore, there is no image frequency, and filters are not required in the high frequency amplifier and intermediate frequency amplifier, making it suitable for miniaturization. Furthermore, since the channel filter 302 shown in FIG. 3 has an intermediate frequency of zero, it can be configured with a low-frequency active filter, can be realized on an integrated circuit, and is suitable for miniaturization.
この無線部を用いた従来の無線選択呼出受信機を第2図
に示す。A conventional radio selective calling receiver using this radio section is shown in FIG.
第2図において、空中線201で受信した無線信号は無
線部202で増幅および復調され、受信データとしてデ
コーダ部203に送られる。デコーダ部203は、RO
M205に登録されている個別の選択呼出番号と、受信
した選択呼出番号を比較し、両者が一致した場合は無線
選択呼出受信機携帯者に鳴音や振動等で報知する。鳴音
は、スピーカ207によって報知し、また、振動はモー
タの軸に偏芯した重りを取付けて回転させるバイブレー
タ209で報知する。In FIG. 2, a radio signal received by an antenna 201 is amplified and demodulated by a radio section 202, and sent to a decoder section 203 as received data. The decoder unit 203
The individual selective calling number registered in the M205 is compared with the received selective calling number, and if the two match, the person carrying the wireless selective calling receiver is notified by sound, vibration, etc. Sound is reported by a speaker 207, and vibration is reported by a vibrator 209, which rotates an eccentric weight attached to the shaft of a motor.
一方、低電圧検出回路210においては、電源電圧が無
線部202を安定して動作させるのに最低必要な電圧を
下回ったことをデコーダ部203に知らせ、スピーカ駆
動部206を介してスピーカ207を鳴音させ、無線選
択呼出受信機の携帯者に電池211の交換を促し、無線
部202が不安定な動作になって感度が劣化しないよう
になっていた。On the other hand, the low voltage detection circuit 210 notifies the decoder unit 203 that the power supply voltage has fallen below the minimum required voltage to operate the wireless unit 202 stably, and causes the speaker 207 to sound via the speaker drive unit 206. A sound is emitted to prompt the person carrying the radio selective calling receiver to replace the battery 211, thereby preventing the radio section 202 from operating unstablely and deteriorating its sensitivity.
[発明が解決しようとする課題]
上述した無線部に直交検波方式を用いた無線選択呼出受
信機は、個別の選択呼出信号を受信すると、スピーカ2
07またはバイブレータ209が駆動されて、無線選択
呼出受信機の携帯者に呼出しがあったことを報知する。[Problem to be Solved by the Invention] The radio selective call receiver using the orthogonal detection method in the radio section described above has the problem that when receiving an individual selective call signal, the speaker 2
07 or the vibrator 209 is activated to notify the person carrying the wireless selective call receiver that there has been a call.
無線部202は、電源電圧が低下してくると不安定な動
作となり、感度劣化を起こすが、特に直交検波方式を用
いた無線選択呼出受信機では、スピーカ207またはバ
イブレータ209が駆動されるときに発生するノイズが
無線部202のチャンネルフィルタ302およびリミッ
タ回路303に影響して信号を抑圧し、感度劣化を起こ
すという問題点がある。The radio section 202 becomes unstable when the power supply voltage decreases, causing deterioration in sensitivity. In particular, in a radio selective calling receiver using an orthogonal detection method, when the speaker 207 or the vibrator 209 is driven, There is a problem in that the generated noise affects the channel filter 302 and limiter circuit 303 of the radio section 202, suppresses the signal, and causes sensitivity deterioration.
[課題を解決するための手段]
本発明は、上記の問題点に鑑みてなされたもので、報知
手段から発生するノイズが無線部の電源に乗ることによ
る感度劣化を防止することを目的とし、この目的を達成
するために、回線周波数と局部発振周波数を等しくし、
ミキサによって受信周波数と局部発振周波数のビートを
取り出し、チャンネルフィルタを介して復調を行う直交
検波方式を用いた無線選択呼出受信機において、呼出し
を報知する報知手段と、報知手段の駆動電源である二次
電池と、二次電池を充電する充電回路を設けるように構
成されている。[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems, and aims to prevent deterioration in sensitivity due to noise generated from the notification means being applied to the power supply of the radio section. To achieve this objective, the line frequency and local oscillator frequency are made equal,
In a radio selective calling receiver using a quadrature detection method in which beats of the received frequency and local oscillation frequency are extracted by a mixer and demodulated via a channel filter, there is a notification means for notifying a call, and a power source for driving the notification means. It is configured to include a secondary battery and a charging circuit for charging the secondary battery.
また、好ましくは、充電回路が昇圧も行うように構成さ
れる。Preferably, the charging circuit is also configured to boost the voltage.
更に好ましくは、充電回路が昇圧回路と逆流阻止用ダイ
オードで構成される
[作用]
上記構成の無線選択呼出受信機においては、無線部の電
源とは別の二次電池を設け、この二次電池で報知手段を
駆動するようにしたことで、報知手段から発生するノイ
ズが無線部の電源に乗ることによる感度劣化を防止する
ことができる。More preferably, the charging circuit is composed of a booster circuit and a backflow blocking diode. [Function] In the wireless selective calling receiver having the above configuration, a secondary battery separate from the power source of the wireless section is provided, and the secondary battery By driving the notification means, it is possible to prevent deterioration in sensitivity due to noise generated from the notification means being applied to the power supply of the wireless section.
[実施例コ 以下、本発明の実施例を図面に基づいて説明する。[Example code] Embodiments of the present invention will be described below based on the drawings.
第1図は、本発明による無線選択呼出受信機の一実施例
を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a wireless selective calling receiver according to the present invention.
第1図において、空中線101で受信した無線信号は無
線部102で増幅および復調され、受信データとしてデ
コーダ部103に送られる。デコーダ部103は、RO
M105に登録されている個別の選択呼出番号と、受信
した選択呼出番号を比較し、両者が一致した場合は無線
選択呼出受信機携帯者に鳴音や振動等で報知する。鳴音
は、スピーカ107によって報知し、また、振動はモー
タの軸に偏芯した重りを取付けて回転させるバイブレー
タ109で報知する。In FIG. 1, a radio signal received by an antenna 101 is amplified and demodulated by a radio section 102, and sent to a decoder section 103 as received data. The decoder section 103
The individual selective calling number registered in the M105 is compared with the received selective calling number, and if the two match, the person carrying the wireless selective calling receiver is notified by ringing, vibration, etc. Sound is reported by a speaker 107, and vibration is reported by a vibrator 109, which rotates an eccentric weight attached to the shaft of a motor.
スピーカ107の駆動はスピーカ駆動部108がデコー
ダ部103の制御によって行われ、またバイブレータ1
09の駆動はバイブレータ駆動部108がデコーダ部1
03の制御によって行われる。水晶発振子104は、デ
コーダ部103を動作させるクロック発生用発振子であ
る。The speaker 107 is driven by a speaker drive section 108 under the control of the decoder section 103, and the vibrator 1
09 is driven by the vibrator drive section 108 and the decoder section 1.
This is done under the control of 03. The crystal oscillator 104 is a clock generating oscillator that operates the decoder section 103.
電源には電池111が使用され、低電圧検出回路110
は電池電圧が受信動作を行うのに最低必要な電圧より下
回ったことをデコーダ部103に知らせ、スピーカ駆動
部106を介してスピーカ107を鳴音させ、無線選択
呼出受信機の携帯者に電池111の交換を促す。スピー
カ107およびバイブレータ109に流れる電流は、電
池111の電圧がDC−DCコンバータ112で昇圧さ
れダイオード113を介して充電された二次電池114
から供給される。A battery 111 is used as a power source, and a low voltage detection circuit 110
notifies the decoder unit 103 that the battery voltage has fallen below the minimum required voltage for receiving operation, causes the speaker 107 to sound via the speaker drive unit 106, and alerts the user of the wireless selective calling receiver to the battery 111. encourage the exchange of The current flowing through the speaker 107 and the vibrator 109 is a secondary battery 114 in which the voltage of the battery 111 is boosted by a DC-DC converter 112 and charged via a diode 113.
Supplied from.
従って、スピーカ107またはバイブレータ109から
発生するノイズは、無線部102の電源ラインに影響を
与えない。ここでダイオード113は、二次電池114
からの電流の逆流を阻止するために用いられている。Therefore, noise generated from the speaker 107 or the vibrator 109 does not affect the power line of the wireless section 102. Here, the diode 113 is a secondary battery 114
It is used to prevent the reverse flow of current from the
[発明の効果]
以上で説明したように、本発明は、回線周波数と局部発
振周波数を等しくし、ミキサによって受信周波数と局部
発振周波数のビートを取り出し、チャンネルフィルタを
介して復調を行う直交検波方式を用いた無線選択呼出受
信機において、呼出しを報知する報知手段と、報知手段
の駆動電源である二次電池と、二次電池を充電する充電
回路を設けるように構成されている。[Effects of the Invention] As explained above, the present invention uses a quadrature detection method in which the line frequency and the local oscillation frequency are made equal, the received frequency and the beat of the local oscillation frequency are extracted by a mixer, and demodulated via a channel filter. The wireless selective calling receiver using the wireless selective calling receiver is configured to include a notification means for notifying a call, a secondary battery as a driving power source for the notification means, and a charging circuit for charging the secondary battery.
このように、無線部の電源とは別の二次電池で報知手段
を駆動するようにしたことで、報知手段から発生するノ
イズが無線部の電源に乗ることによる感度劣化を防止す
ることが可能となる。In this way, by driving the notification means with a secondary battery that is separate from the power supply of the radio section, it is possible to prevent deterioration in sensitivity due to noise generated from the notification means riding on the power supply of the radio section. becomes.
第1図は、本発明による無線選択呼出受信機の一実施例
を示すブロック図、
第2図は、従来の無線選択呼出受信機を示すブロック図
、
第3図は、従来の無線選択呼出受信機を示すブロック図
である。
01
02
03
04
05
06
07
08
09
10
空中線
無線部
デコーダ部
水晶発振子
OM
スピーカ駆動部
スピーカ
バイブレータ駆動部
バイブレータ
低電圧検出回路
1
2
3
4
電池
DC−DCコンバータ
ダイオード
二次電池FIG. 1 is a block diagram showing an embodiment of a radio selective call receiver according to the present invention, FIG. 2 is a block diagram showing a conventional radio selective call receiver, and FIG. 3 is a block diagram showing a conventional radio selective call receiver. FIG. 01 02 03 04 05 06 07 08 09 10 Antenna radio section Decoder section Crystal oscillator OM Speaker drive section Speaker vibrator drive section Vibrator Low voltage detection circuit 1 2 3 4 Battery DC-DC converter diode Secondary battery
Claims (2)
によつて受信周波数と局部発振周波数のビートを取り出
し、チャンネルフィルタを介して復調を行う直交検波方
式を用いた無線選択呼出受信機において、呼出しを報知
する報知手段と、該報知手段の駆動電源である二次電池
と、該二次電池を充電する充電回路を有する無線選択呼
出受信機。(1) In a radio selective paging receiver that uses an orthogonal detection method in which the line frequency and local oscillation frequency are made equal, a mixer extracts the beats of the received frequency and local oscillation frequency, and demodulation is performed via a channel filter. A wireless selective calling receiver comprising: a notification means for notifying the user; a secondary battery as a driving power source for the notification means; and a charging circuit for charging the secondary battery.
項1記載の無線選択呼出受信機。(3)前記充電回路が
昇圧回路と逆流阻止用ダイオードで構成されることを特
徴とする請求項1記載の無線選択呼出受信機。(2) The radio selective calling receiver according to claim 1, wherein the charging circuit also boosts the voltage. (3) The radio selective calling receiver according to claim 1, wherein the charging circuit is comprised of a booster circuit and a reverse current blocking diode.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2032990A JPH03226029A (en) | 1990-01-30 | 1990-01-30 | Selective radio call receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2032990A JPH03226029A (en) | 1990-01-30 | 1990-01-30 | Selective radio call receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03226029A true JPH03226029A (en) | 1991-10-07 |
Family
ID=12024099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2032990A Pending JPH03226029A (en) | 1990-01-30 | 1990-01-30 | Selective radio call receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03226029A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08237713A (en) * | 1995-02-28 | 1996-09-13 | Nec Corp | Radio selective calling receiver with infrared ray data transmission function |
JPH1094014A (en) * | 1997-08-19 | 1998-04-10 | Nec Corp | Selective radio call receiver |
US6320278B1 (en) | 1997-06-30 | 2001-11-20 | Nec Corporation | Power supply circuit |
US6348854B1 (en) | 1998-03-26 | 2002-02-19 | Nec Corporation | Radio selective-calling receiver |
-
1990
- 1990-01-30 JP JP2032990A patent/JPH03226029A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08237713A (en) * | 1995-02-28 | 1996-09-13 | Nec Corp | Radio selective calling receiver with infrared ray data transmission function |
US5764393A (en) * | 1995-02-28 | 1998-06-09 | Nec Corporation | Data transmission control device of radio selection call receiver |
US6320278B1 (en) | 1997-06-30 | 2001-11-20 | Nec Corporation | Power supply circuit |
JPH1094014A (en) * | 1997-08-19 | 1998-04-10 | Nec Corp | Selective radio call receiver |
US6348854B1 (en) | 1998-03-26 | 2002-02-19 | Nec Corporation | Radio selective-calling receiver |
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