JPS63228860A - Modulated wave detection circuit - Google Patents
Modulated wave detection circuitInfo
- Publication number
- JPS63228860A JPS63228860A JP6109587A JP6109587A JPS63228860A JP S63228860 A JPS63228860 A JP S63228860A JP 6109587 A JP6109587 A JP 6109587A JP 6109587 A JP6109587 A JP 6109587A JP S63228860 A JPS63228860 A JP S63228860A
- Authority
- JP
- Japan
- Prior art keywords
- modulated wave
- detection
- fsk
- fsk modulated
- wave
- 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 title claims abstract description 34
- 239000000284 extract Substances 0.000 claims abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 13
- 238000001228 spectrum Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
ＦＳＫ変調による偏移周波数成分を抽出して、ＦＳＫ変
調波の有無を検出するもので、無変調時のキャリア送出
を停止する為に適用することができる。[Detailed Description of the Invention] [Summary] This detects the presence or absence of an FSK modulated wave by extracting a shift frequency component due to FSK modulation, and can be applied to stop carrier transmission when no modulation is performed.
本発明は、ＦＳＫ変調波の有無を検出する変調波検出回
路に関するものである。The present invention relates to a modulated wave detection circuit that detects the presence or absence of an FSK modulated wave.
ＦＳＫ （Ｆｒｅｑｕｅｎｃｙ ５ｈｉｆｔ Ｋｅ
ｙｉｎｇ）変調によりデータを伝送する無線通信システ
ムに於いては、伝送すべきデータがない時でも、送信局
から無変調波を送信しているもので、それによる消費電
力の問題があった。FSK (Frequency 5hift Ke
In a wireless communication system that transmits data by modulation, a transmitting station transmits an unmodulated wave even when there is no data to be transmitted, which poses a problem of power consumption.
ＦＳＫ変調方式は、データの“１”、１０”に対応して
周波数をシフトさせるものであり、比較的低速のデータ
を伝送するシステムに適用されている。このようなＦＳ
Ｘ変調波の送信局に於いては、例えば、電圧制御発振器
を変調器として用いた場合、送信データがない時に中心
周波数で発振するように制御電圧を設定し、その制御電
圧に送信データを重畳させることにより、中心周波数に
対して±Δｆの偏移を与えたＦＳＫ変調波とし、終段の
電力増幅器により増幅して、アンテナから送信するもの
である。The FSK modulation method shifts the frequency in response to data "1" and "10", and is applied to systems that transmit relatively low-speed data.Such FS
For example, when a voltage-controlled oscillator is used as a modulator at a transmitting station for an X-modulated wave, the control voltage is set so that it oscillates at the center frequency when there is no transmission data, and the transmission data is superimposed on that control voltage. By doing so, the FSK modulated wave is generated with a deviation of ±Δf from the center frequency, amplified by the power amplifier at the final stage, and transmitted from the antenna.
前述のように、従来のＦＳＸ変調波の送信局に於いては
、ＦＳＸ変調波の検出手段を備えていないものであるか
ら、送信データがない場合に、中心周波数のキャリアが
送信される。例えば、ページング・システムに於けるペ
ージャ受信機の呼出通信は、８個のページャ受信機対応
のデータを１バツチとし、１バッチ或いは複数バッチの
先頭に同期用信号を含むプリアンプルワードを付加して
ＦＳＫ変調波により送信するものである。その場合、送
信局は分散配置されて無人化されているのが一般的であ
り、呼出通信がない場合でも、部ち、送信データがない
場合でも、キャリアの送信が行われることになる。As described above, the conventional FSX modulated wave transmitting station is not equipped with an FSX modulated wave detection means, and therefore, the carrier at the center frequency is transmitted when there is no transmission data. For example, paging communication for pager receivers in a paging system involves making one batch of data compatible with eight pager receivers, and adding a preamble word containing a synchronization signal to the beginning of one or more batches. It is transmitted using FSK modulated waves. In this case, the transmitting stations are generally distributed and unmanned, and carrier transmission is performed even when there is no paging communication or even when there is no data to be transmitted.
ＦＳＸ変調波の検出手段がないことにより、送信データ
の有無に関係なく、常時キャリアを送信することになる
から、無用な電力が消費される欠点があった。Since there is no means for detecting FSX modulated waves, the carrier is constantly transmitted regardless of the presence or absence of transmission data, which has the drawback of unnecessary power consumption.
本発明は、比較的簡単な構成によりＦＳＫ変調波を検出
することを目的とするものである。An object of the present invention is to detect an FSK modulated wave with a relatively simple configuration.
Ｃ問題点を解決するための手段〕
本発明の変調波検出回路は、第１図を参照して説明する
と、ＦＳＫ変調による偏移周波数成分を抽出する狭帯域
フィルタ１．２と、それらの狭帯域フィルタ１，２の出
力信号を検波等により検出する検出部３．４と、それら
の検出部３．４から共に検出信号が得られた時に、ＦＳ
Ｘ変調波であると識別する識別部５とを備えたものであ
る。Means for Solving Problem C] The modulated wave detection circuit of the present invention will be explained with reference to FIG. When the detection unit 3.4 detects the output signals of the bandpass filters 1 and 2 by wave detection etc., and the detection signals are obtained from both of the detection units 3.4, the FS
It is equipped with an identification section 5 that identifies it as an X-modulated wave.
ＦＳＫ変調波のスペクトラムは、第２図に於ける曲ｖＡ
ａで示すように、中心周波数ｆｏに対してΔｆ偏移した
偏移周波数ｒ、、ｒ２の成分を含むが、無変調波は、中
心周波数ｆ。の成分のみとなる。従って、狭帯域フィル
タ１の通過帯域特性を点線曲線Ｃ１狭帯域フィルタ２の
通過帯域特性を点線曲線ｄとすることにより、偏移周波
数ｆｉｒｆ２成分を抽出することができる。The spectrum of the FSK modulated wave is the music vA in Figure 2.
As shown by a, the non-modulated wave includes components with shift frequencies r, , r2 shifted by Δf with respect to the center frequency fo, but the unmodulated wave has a center frequency f. The ingredients are only. Therefore, by setting the passband characteristic of the narrowband filter 1 to be the dotted line curve C1 and the passband characteristic of the narrowband filter 2 to be the dotted line curve d, it is possible to extract the shift frequency firf2 component.
従って、狭帯域フィルタ１．２の出力信号を検出部３．
４に於いて検波、レベル検出等を行うことにより検出し
、識別部５に於いて検出部３，４から共に検出信号が得
られた時に、ＦＳＫ変調変調波色判定することができる
。Therefore, the output signal of the narrowband filter 1.2 is transferred to the detection unit 3.
4, it is detected by performing wave detection, level detection, etc., and when detection signals are obtained from both the detection sections 3 and 4 at the identification section 5, the FSK modulation wave color can be determined.
以下図面を参照して本発明の実施例について詳細に説明
する。Embodiments of the present invention will be described in detail below with reference to the drawings.
第３図は本発明の実施例のブロック図であり、１１．１
２は狭帯域フィルタ、１．３．１４は検出部、１５は識
別部、１６は変調器、１７は増幅器、１８は周波数変換
器、１９は局部発振器、２０２２１は高周波スイッチ、
２２はフィルタである。高周波スイッチ２０．２１は何
れか一方のみ設けることもできるものであり、従って、
高周波スイッチ２１は点線で示している。FIG. 3 is a block diagram of an embodiment of the present invention, and 11.1
2 is a narrow band filter, 1.3.14 is a detection unit, 15 is an identification unit, 16 is a modulator, 17 is an amplifier, 18 is a frequency converter, 19 is a local oscillator, 20221 is a high frequency switch,
22 is a filter. It is also possible to provide only one of the high frequency switches 20 and 21, and therefore,
The high frequency switch 21 is shown by a dotted line.
送信データは変調器１６に加えられてＦＳＫ変調され、
増幅器１７により増幅されて周波数変換器１８に加えら
れる。高周波スイッチ２０．２１がオンの場合に、局部
発振器１９からの局部発振信号が周波数変換器１８に加
えられて送信周波数に変換され、フィルタ２２を介して
図示を省略した電力増幅器により増幅されてアンテナか
ら送信される。The transmitted data is applied to a modulator 16 and subjected to FSK modulation,
The signal is amplified by an amplifier 17 and applied to a frequency converter 18 . When the high frequency switches 20 and 21 are on, the local oscillation signal from the local oscillator 19 is applied to the frequency converter 18, converted to a transmission frequency, passed through the filter 22, and amplified by a power amplifier (not shown) to send it to the antenna. Sent from.
変調器１６により変調されたＦＳＫ変調波は、第２図の
曲線ａに示すようなスペクトラムを有するものであり、
狭帯域フィルタ１１．１２は、点線曲線ｃ、ｄに示す通
過帯域特性を有するものである。従って、狭帯域フィル
タ１１．１２により、ＦＳＫ変調波の偏移周波数ｒ、、
ｒ２成分を抽出することができる。The FSK modulated wave modulated by the modulator 16 has a spectrum as shown by curve a in FIG.
The narrowband filters 11 and 12 have passband characteristics shown by dotted line curves c and d. Therefore, the shift frequency r of the FSK modulated wave is determined by the narrow band filter 11.12.
The r2 component can be extracted.
又無変調時は、第２図の曲線すに示すような中心周波数
ｆｏ酸成分みとなるから、この中心周波数ｆｏからΔｆ
離れた偏移周波数ｆ、、ｆ２を中心周波数とする狭帯域
フィルタ１１．１２によっては抽出されないものとなる
。In addition, when there is no modulation, the center frequency fo is the acid component as shown in the curve in Fig. 2, so from this center frequency fo, Δf
It will not be extracted by the narrow band filters 11, 12 whose center frequencies are at distant shift frequencies f, , f2.
狭帯域フィルタ１１．１２の出力信号は検出部１３．１
４に加えられ、この検出部１３．１４に於いて検波、レ
ベル比較等が行われ、検波出力信号が所定のレベル以上
の時に検出信号が出力される。この検出信号は識別部１
５に加えられ、両方の検出部１３．１４からの検出信号
が加えられた時に、ＦＳＸ変調波と判定し、そのＦＳＸ
変調波検出信号を、高周波スイッチ２０．２１のオン制
御信号として加える。それにより、高周波スイッチ２０
．２１がオンとなり、局部発振器１９から高周波スイッ
チ２０を介して局部発振信号が周波数変換器１８に加え
られて、ＦＳＫ変調波は送信周波数に変換され、高周波
スイッチ２１を介して電力増幅器（図示せず）に加えら
れる。The output signal of the narrowband filter 11.12 is sent to the detection section 13.1.
4, detection and level comparison are performed in the detection units 13 and 14, and a detection signal is output when the detection output signal is at a predetermined level or higher. This detection signal is
5, and when the detection signals from both detectors 13 and 14 are added, it is determined to be an FSX modulated wave, and the FSX
The modulated wave detection signal is applied as an ON control signal to the high frequency switch 20.21. Thereby, the high frequency switch 20
．． 21 is turned on, a local oscillation signal is applied from the local oscillator 19 to the frequency converter 18 via the high frequency switch 20, the FSK modulated wave is converted to a transmission frequency, and the FSK modulated wave is applied to the power amplifier (not shown) via the high frequency switch 21. ).
又検出部１３．１４の何れか一方からのみ検出信号が得
られた場合は、識別部１５はノイズによる検出信号と見
做して、ＦＳＸＳＸ変調波色判定する。又検出部１３．
１４の両方から検出信号が得られない場合も、識別部１
５はＦＳＫ変調変調波色判定する。そして、ＦＳＫ変調
変調波色場合は、識別部１５は、オフ制御信号を高周波
スイッチ２０．２１に加えるから、・高周波スイッチ２
０．２１はオフとなり、周波数変換器１８に加える局部
発振信号が遮断され、又周波数変換器１８の出力信号が
遮断されるから、図示を省略した電力増幅器への入力が
零となり、キャリア送出が停止された状態となる。If a detection signal is obtained from only one of the detection units 13 and 14, the identification unit 15 regards the detection signal as a noise signal and determines the color of the FSXSX modulated wave. Also, the detection unit 13.
Even when detection signals cannot be obtained from both of the identification unit 1
5 determines the FSK modulation wave color. Then, in the case of FSK modulation modulation wave color, the identification unit 15 applies an off control signal to the high frequency switch 20.21, so that the high frequency switch 2
0.21 is turned off, the local oscillation signal applied to the frequency converter 18 is cut off, and the output signal of the frequency converter 18 is also cut off, so the input to the power amplifier (not shown) becomes zero, and carrier transmission is interrupted. It will be in a stopped state.
この場合、高周波スイッチ２０のみを設けて、ＦＳＸＳ
Ｘ変調波色場合に、局部発振信号を遮断すると、変調中
心周波数ｆｏの信号は、周波数変換器１８をそのまま通
過し、送信周波数（ｆｏと異なる周波数）を通過帯域と
するフィルタ２２でカットされるから、キャリア送出を
停止することができる。又狭帯域フィルタは、水晶フィ
ルタ等により構成することもできる。In this case, only the high frequency switch 20 is provided and the FSXS
In the case of X modulation wave color, when the local oscillation signal is cut off, the signal with the modulation center frequency fo passes through the frequency converter 18 as it is, and is cut by the filter 22 whose passband is the transmission frequency (a frequency different from fo). From then on, carrier transmission can be stopped. Further, the narrowband filter can also be constructed from a crystal filter or the like.
以上説明したように、本発明は、ＦＳＸ変調波の偏移周
波数成分を狭帯域フィルタ１．２によって抽出し、両方
の狭帯域フィルタ１，２から偏移周波数成分が抽出され
た時に、ＦＳＸＳＸ変調波色するもので、比較的簡単な
構成でＦＳＫ変調波を検出できる。従って、ＦＳＫ変調
波を送信する送信局に於いて、ＦＳＫ変調変調波色場合
に、キャリアの送信を停止して、低消費電力化を図るこ
とができる。As explained above, the present invention extracts the shift frequency component of the FSX modulated wave by the narrowband filter 1.2, and when the shift frequency component is extracted from both narrowband filters 1 and 2, the FSXSX modulation wave is The FSK modulated wave can be detected with a relatively simple configuration. Therefore, in a transmitting station that transmits an FSK modulated wave, when the FSK modulated wave is colored, carrier transmission can be stopped to reduce power consumption.
第１図は本発明の原理説明図、第２図はスペクトラム説
明図、第３図は本発明の実施例のブロック図である。
１．２，１１．１２は狭帯域フィルタ、３，４．１３．
１４は検出部、５，１５は識別部、１６は変調器、１７
は増幅器、１８は周波数変換器、１９は局部発振器、２
０．２１は高周波スイッチである。FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a diagram explaining the spectrum, and FIG. 3 is a block diagram of an embodiment of the present invention. 1.2, 11.12 are narrow band filters, 3, 4.13.
14 is a detection section, 5 and 15 are identification sections, 16 is a modulator, 17
is an amplifier, 18 is a frequency converter, 19 is a local oscillator, 2
0.21 is a high frequency switch.
Claims (1)
、 ＦＳＫ変調による偏移周波数成分を抽出する狭帯域フィ
ルタ（１、２）と、 該狭帯域フィルタ（１、２）の出力信号を検出する検出
部（３、４）と、 該検出部（３、４）の両方からの検出信号によりＦＳＫ
変調有りを識別する識別部（５）とを備えたことを特徴
とする変調波検出回路。[Claims] A modulated wave detection circuit that detects the presence or absence of an FSK modulated wave includes: a narrowband filter (1, 2) that extracts a shift frequency component due to FSK modulation; ) detects the output signal of
A modulated wave detection circuit comprising: an identification section (5) for identifying the presence of modulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6109587A JPS63228860A (en) | 1987-03-18 | 1987-03-18 | Modulated wave detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6109587A JPS63228860A (en) | 1987-03-18 | 1987-03-18 | Modulated wave detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63228860A true JPS63228860A (en) | 1988-09-22 |
Family
ID=13161179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6109587A Pending JPS63228860A (en) | 1987-03-18 | 1987-03-18 | Modulated wave detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63228860A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006033428A1 (en) * | 2004-09-21 | 2006-03-30 | Kabushiki Kaisha Kenwood | Wireless communication apparatus and wireless communication method |
| JP2006093794A (en) * | 2004-09-21 | 2006-04-06 | Kenwood Corp | Wireless communication control apparatus and wireless communication method |
-
1987
- 1987-03-18 JP JP6109587A patent/JPS63228860A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006033428A1 (en) * | 2004-09-21 | 2006-03-30 | Kabushiki Kaisha Kenwood | Wireless communication apparatus and wireless communication method |
| JP2006093794A (en) * | 2004-09-21 | 2006-04-06 | Kenwood Corp | Wireless communication control apparatus and wireless communication method |
| US7805294B2 (en) | 2004-09-21 | 2010-09-28 | Kabushiki Kaisha Kenwood | Wireless communication apparatus and wireless communication method |
| US7826403B2 (en) | 2004-09-21 | 2010-11-02 | Kabushiki Kaisha Kenwood | Wireless communication control apparatus and wireless communication method to reduce inter-channel interference in narrow-band communications |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH02309825A (en) | Vehicle-loaded equipment of automatic vehicle tracking system | |
| SE428746B (en) | DUPLEX SEND COMMAND RECEPTION EQUIPMENT | |
| EP0572379B1 (en) | A method for the contactless transmission of information | |
| JPS63228860A (en) | Modulated wave detection circuit | |
| JPS6314535B2 (en) | ||
| GB1048328A (en) | Radio communication system | |
| JP2802089B2 (en) | Microwave relay method | |
| JP2624815B2 (en) | Identification system | |
| JPS6397023A (en) | Antenna switching system for radio communication system | |
| JPH06164555A (en) | Frequency diversity communication device | |
| JPH0514289A (en) | Signal transmitter | |
| JPS6055742A (en) | Transmitter and receiver | |
| JPS6228615B2 (en) | ||
| JPS6322544Y2 (en) | ||
| JPS6333824B2 (en) | ||
| JPH0742284U (en) | RF data transceiver | |
| JPH02196547A (en) | Control signal transmission system | |
| JPH11103481A (en) | Device for deciding existence of receiving signal | |
| JPS6143027A (en) | Tracking controller | |
| JPH11103262A (en) | Frequency converter for superheterodyne receiver | |
| JPS61251240A (en) | Automatic frequency control system | |
| JPH0149219B2 (en) | ||
| JPS5853822B2 (en) | signal identification circuit | |
| JPS62173842A (en) | Microwave transmitter-receiver | |
| JPH01183942A (en) | Transfer device using sub-carrier |