JPH05347639A - Fsk receiver - Google Patents
Fsk receiverInfo
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- JPH05347639A JPH05347639A JP4153967A JP15396792A JPH05347639A JP H05347639 A JPH05347639 A JP H05347639A JP 4153967 A JP4153967 A JP 4153967A JP 15396792 A JP15396792 A JP 15396792A JP H05347639 A JPH05347639 A JP H05347639A
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- Prior art keywords
- frequency
- output
- oscillator
- fundamental
- oscillation
- Prior art date
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- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＦＳＫ方式で変調され
た信号を受信するＦＳＫ受信器において、基本周波数発
振器の発振周波数を補正する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting the oscillation frequency of a fundamental frequency oscillator in an FSK receiver that receives a signal modulated by the FSK method.
【０００２】[0002]
【従来の技術】ＦＳＫ方式で変調された信号を受信する
ＦＳＫ受信器では、ＲＦ部の出力を局部発振部の出力と
混合して中間周波数に変換し、この中間周波数を増幅後
に復調するいわゆるスーパヘテロダイン方式を採用した
ものがある。このようなＦＳＫ受信器では、例えば局部
発振部として例えば逓倍部を用い、基本周波数発振器の
発振周波数を逓倍して局部発振周波数を作成している。2. Description of the Related Art In an FSK receiver for receiving a signal modulated by the FSK system, the output of an RF section is mixed with the output of a local oscillating section to convert it to an intermediate frequency, and this so-called intermediate frequency is amplified and demodulated. Some have adopted the heterodyne method. In such an FSK receiver, for example, a multiplier is used as the local oscillator, and the oscillation frequency of the fundamental frequency oscillator is multiplied to create the local oscillation frequency.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上記ＦＳＫ
受信器では通常は基本周波数発振器の発振周波数精度は
あまり問題とならない。しかし、ＦＳＫ受信器の基本周
波数発振器の発振周波数をＦＳＫ送信器で用いる場合、
例えばＦＳＫ送受信器である場合、温度変化や経年変化
などがあると、正常なＦＳＫ方式での送受信を行えなく
なる。そこで、このような場合には精度の高い高価な発
振器を基本周波数発振器として用いる必要があった。By the way, the above FSK
In the receiver, the accuracy of the oscillation frequency of the fundamental frequency oscillator is not usually a problem. However, when the oscillation frequency of the fundamental frequency oscillator of the FSK receiver is used in the FSK transmitter,
For example, in the case of an FSK transceiver, if there is a change in temperature or a change over time, it becomes impossible to perform transmission / reception in the normal FSK system. Therefore, in such a case, it is necessary to use a highly accurate and expensive oscillator as the fundamental frequency oscillator.
【０００４】本発明は上述の点に鑑みて為されたもので
あり、その目的とするところは、精度の高い高価な発振
器を用いなくても、基本周波数発振器の発振周波数の精
度を高くできるＦＳＫ受信器を提供することにある。The present invention has been made in view of the above points, and it is an object of the present invention to improve the accuracy of the oscillation frequency of the fundamental frequency oscillator without using an expensive and highly accurate oscillator. To provide a receiver.
【０００５】[0005]
【課題を解決するための手段】本発明では、上記目的を
達成するために、ＲＦ部の出力を局部発振部の出力と混
合して中間周波数に変換し、この中間周波数を増幅後に
復調するＦＳＫ受信器であって、上記局部発振部が基本
周波数発振器の発振周波数を基にして局部発振周波数を
作成し、上記基本周波数発振器として電圧制御発振器を
用い、データ無しのキャリア信号が受信され且つ基本周
波数発振器の発振周波数にずれがない場合に、上記基本
周波数発振器の発振周波数と中間周波数との変換周波数
が一致するように基本周波数発振器の発振周波数と中間
周波数とを周波数変換する周波数変換手段と、この周波
数変換手段の夫々の出力の周波数を比較する周波数比較
手段と、周波数比較手段の出力を電圧信号に変換する周
波数／電圧変換手段と、この周波数／電圧変換手段のデ
ータに基づく出力を復調後のデータを用いて打ち消し
て、基本周波数発振器の発振周波数のずれに応じた周波
数／電圧変換手段の出力のみを抽出し、その抽出出力で
基本周波数発振器の発振周波数を可変制御する制御手段
とを備えている。According to the present invention, in order to achieve the above object, the output of the RF section is mixed with the output of the local oscillating section to be converted into an intermediate frequency, and the intermediate frequency is demodulated and then demodulated. In the receiver, the local oscillation unit creates a local oscillation frequency based on the oscillation frequency of the fundamental frequency oscillator, the voltage-controlled oscillator is used as the fundamental frequency oscillator, and the carrier signal without data is received and the fundamental frequency When there is no deviation in the oscillation frequency of the oscillator, frequency conversion means for frequency-converting the oscillation frequency of the fundamental frequency oscillator and the intermediate frequency so that the conversion frequency of the oscillation frequency of the fundamental frequency oscillator and the conversion frequency of the intermediate frequency match, Frequency comparison means for comparing the frequencies of the respective outputs of the frequency conversion means, and a frequency / voltage conversion means for converting the output of the frequency comparison means into a voltage signal. And the output based on the data of the frequency / voltage converting means is canceled by using the demodulated data, and only the output of the frequency / voltage converting means corresponding to the deviation of the oscillation frequency of the fundamental frequency oscillator is extracted, and the extracted output And a control means for variably controlling the oscillation frequency of the fundamental frequency oscillator.
【０００６】[0006]
【作用】本発明は、受信されるＦＳＫ信号の周波数は精
度が高いものである点に着目し、上述のようにいわゆる
ＰＬＬループを構成することにより、上記ＦＳＫ信号の
周波数を基準に基本周波数発振器の発振周波数のずれを
補正し、基本周波数発振器として高精度の高価な発振器
を用いなくても、基本周波数発振器の発振周波数の精度
を高くすることを可能としたものである。The present invention pays attention to the fact that the frequency of the received FSK signal is highly accurate, and by forming the so-called PLL loop as described above, the fundamental frequency oscillator is based on the frequency of the FSK signal. It is possible to improve the accuracy of the oscillation frequency of the fundamental frequency oscillator by correcting the deviation of the oscillation frequency and without using a highly accurate and expensive oscillator as the fundamental frequency oscillator.
【０００７】[0007]
【実施例】図１乃至図４に本発明の一実施例を示す。本
実施例のＦＳＫ受信器は、基本構成として、アンテナ入
力を増幅するＲＦ部１と、このＲＦ部１の出力と局部発
振部としての逓倍部７の出力とを混合して中間周波数に
変換するミキサ２と、このミキサ２の出力である中間周
波数信号を増幅するＩＦ部３と、このＩＦ部３の出力を
復調する復調部４と、復調部４の出力に基づいてデータ
内容の判定などの処理を行うＣＰＵからなる制御部５
と、上記逓倍部６に基本周波数を与える基本周波数発振
器６とを備えている。1 to 4 show an embodiment of the present invention. The FSK receiver of this embodiment has, as a basic configuration, an RF section 1 for amplifying an antenna input, an output of the RF section 1 and an output of a multiplication section 7 as a local oscillating section, which are mixed to convert to an intermediate frequency. The mixer 2, the IF unit 3 that amplifies the intermediate frequency signal that is the output of the mixer 2, the demodulation unit 4 that demodulates the output of the IF unit 3, and the determination of the data content based on the output of the demodulation unit 4 Control unit 5 including a CPU that performs processing
And a fundamental frequency oscillator 6 for giving a fundamental frequency to the multiplication unit 6.
【０００８】そして、本実施例では基本周波数発振器６
の発振周波数の精度を高くするために、上記構成に加え
て、ミキサ２の出力をＭ分周する分周部９と、基本周波
数発振器６の出力をＮ１倍に逓倍する逓倍部８と、この
逓倍部８及び分周部９の出力の周波数を比較する周波数
比較部１０と、周波数比較部１０の出力を電圧に変換す
る周波数／電圧変換手段としてのローパスフィルタ１１
と、このローパスフィルタ１１の出力をＡ／Ｄ変換して
制御部５に与えるＡ／Ｄ変換部１２と、制御部５の制御
出力をＤ／Ａ変換して基本周波数発振器６に与えるＤ／
Ａ変換部１３とを備えている。In this embodiment, the fundamental frequency oscillator 6
In order to increase the accuracy of the oscillation frequency of the above, in addition to the above configuration, a frequency divider 9 for dividing the output of the mixer 2 by M, a multiplier 8 for multiplying the output of the fundamental frequency oscillator 6 by N1 times, A frequency comparison unit 10 for comparing the frequencies of the outputs of the frequency multiplication unit 8 and the frequency division unit 9, and a low-pass filter 11 as frequency / voltage conversion means for converting the output of the frequency comparison unit 10 into a voltage.
And an A / D converter 12 for A / D converting the output of the low-pass filter 11 and applying it to the controller 5, and a D / A converter for controlling the output of the controller 5 and applying D / A to the fundamental frequency oscillator 6.
The A conversion unit 13 is provided.
【０００９】つまり、受信されるＦＳＫ信号の周波数は
高精度なものである。そこで、本実施例では上記付加構
成によりＰＬＬループを形成し（但し、制御部５を含
む）、ＦＳＫ信号の周波数を基準にして基本周波数発振
器６の周波数をずれを補正するようにしたものである。
この場合、基本周波数発振器６は補正できるように発振
周波数が可変自在である必要があるので、本実施例の場
合には基本周波数発振器６としてその発振周波数がＤ／
Ａ変換部１３の出力に応じて可変自在な電圧制御発振器
（ＶＣＯ）を用いてある。そして、周波数変換手段とし
て用いてある逓倍部８と分周部９とでは、データ無しの
キャリア信号が受信され、且つ基本周波数発振器６の発
振周波数にずれがない場合に、上記基本周波数発振器６
の発振周波数と中間周波数との変換周波数が一致するよ
うに、逓倍比及び分周比を設定してある。また、周波数
比較手段としての周波数比較部１０の出力を電圧信号に
変換する周波数／電圧変換手段としてローパスフィルタ
１１を用いてある。That is, the frequency of the received FSK signal is highly accurate. Therefore, in this embodiment, a PLL loop is formed by the above-mentioned additional configuration (however, the control unit 5 is included), and the frequency of the basic frequency oscillator 6 is corrected with reference to the frequency of the FSK signal. ..
In this case, the oscillation frequency of the fundamental frequency oscillator 6 needs to be variable so that it can be corrected. Therefore, in the case of the present embodiment, the oscillation frequency of the fundamental frequency oscillator 6 is D /
A voltage controlled oscillator (VCO) that is variable according to the output of the A conversion unit 13 is used. Then, when the carrier signal without data is received and the oscillation frequency of the fundamental frequency oscillator 6 is not deviated, the multiplication unit 8 and the frequency division unit 9 used as the frequency conversion means have the fundamental frequency oscillator 6 described above.
The multiplication ratio and the frequency division ratio are set so that the oscillating frequency and the conversion frequency of the intermediate frequency match. Further, the low-pass filter 11 is used as the frequency / voltage conversion means for converting the output of the frequency comparison unit 10 as the frequency comparison means into a voltage signal.
【００１０】ところで、このようにＦＳＫ信号の周波数
を基準にして基本周波数発振器６の周波数をずれを補正
する場合には、キャリア信号（Ｆ）に重畳されるデータ
に基づく周波数の偏移分（±ｄｆ）により基本周波数発
振器６の発振周波数の補正に誤差を生じる問題がある。
そこで、本実施例では制御手段としての制御部５に、ロ
ーパスフィルタ１１のデータに基づく出力を復調後のデ
ータを用いて打ち消して基本周波数発振器６の発振周波
数のずれに応じた出力だけを抽出する機能を設けてあ
る。By the way, in the case of correcting the deviation of the frequency of the fundamental frequency oscillator 6 with reference to the frequency of the FSK signal in this way, the frequency shift amount (±) based on the data superimposed on the carrier signal (F). There is a problem that an error occurs in the correction of the oscillation frequency of the fundamental frequency oscillator 6 due to df).
Therefore, in the present embodiment, the control unit 5 serving as a control unit cancels the output based on the data of the low-pass filter 11 by using the demodulated data, and extracts only the output according to the deviation of the oscillation frequency of the fundamental frequency oscillator 6. It has a function.
【００１１】以下、本実施例の動作を３通りの場合に分
類して具体的に説明する。まず、受信するＦＳＫ信号が
すべて”０”（周波数：Ｆ−ｄｆ）で、且つ基本周波数
発振器６の発振周波数がずれていない場合の動作につい
て図２で説明する。基本周波数発振器６の発振周波数Ｆ
Ｒは逓倍部７及び逓倍部８で夫々Ｎ１，Ｎ２倍される。
なお、以下各部の出力は特に言及しない場合には周波数
を意味する。ここで、逓倍部７の出力ＦＲ×Ｎ１は、Ｒ
Ｆ部１で受信されたＦＳＫ信号Ｆ−ｄｆとミキサ２で混
合される。この場合のミキサ２の出力はＦ−ｄｆ−ＦＲ
×Ｎ１となる。そして、このミキサ２の出力は分周部９
でＭ分周され、この分周部９の出力ＦＡは、 ＦＡ＝（Ｆ−ｄｆ−ＦＲ×Ｎ１）／Ｍ …（１） となる。上記逓倍部８の出力ＦＢは、 ＦＢ＝ＦＲ×Ｎ２ …（２） である。The operation of this embodiment will be described in detail below by classifying it into three cases. First, the operation when all the received FSK signals are "0" (frequency: F-df) and the oscillation frequency of the fundamental frequency oscillator 6 is not shifted will be described with reference to FIG. Oscillation frequency F of fundamental frequency oscillator 6
R is multiplied by N1 and N2 in the multiplication unit 7 and the multiplication unit 8, respectively.
In the following, the output of each unit means the frequency unless otherwise specified. Here, the output FR × N1 of the multiplier 7 is R
The FSK signal F-df received by the F unit 1 is mixed by the mixer 2. The output of the mixer 2 in this case is F-df-FR.
× N1. The output of the mixer 2 is the frequency dividing unit 9
The frequency is divided by M, and the output FA of the frequency dividing unit 9 becomes FA = (F-df-FR * N1) / M (1). The output FB of the multiplier 8 is FB = FR × N2 (2)
【００１２】ここで、受信器が送信器の発するキャリア
信号Ｆ（信号無し）を受信したとき、上記逓倍部７，８
の逓倍比Ｎ１，Ｎ２及び分周部９の分周比Ｍは、次式を
満たすように設定される。 ＦＡ＝ＦＢ （Ｆ−ＦＲ×Ｎ１）／Ｍ＝ＦＲ×Ｎ２ …（３） 従って、ＦＳＫ信号の”０”が入力された場合には、周
波数比較部１０からは−ｄｆ／Ｍが出力され、この出力
−ｄｆ／Ｍをローパスフィルタ１１を通すと、出力Ｖが
得られる。制御部５ではこの出力ＶをＡ／Ｄ変換部１２
でディジタル値に変換したデータを、復調部４の復調出
力からデータを判定する基準電圧として用いる。なお、
このローパスフィルタ１１の出力がＶである場合には、
基本周波数発振器６の発振周波数の補正は行わない。Here, when the receiver receives the carrier signal F (no signal) emitted from the transmitter, the multipliers 7 and 8 are provided.
The multiplication ratios N1 and N2 and the frequency division ratio M of the frequency division unit 9 are set so as to satisfy the following equation. FA = FB (F−FR × N1) / M = FR × N2 (3) Therefore, when “0” of the FSK signal is input, the frequency comparison unit 10 outputs −df / M, An output V is obtained by passing this output -df / M through the low-pass filter 11. The control unit 5 converts this output V into an A / D conversion unit 12
The data converted into a digital value in step 1 is used as a reference voltage for determining data from the demodulated output of the demodulator 4. In addition,
When the output of the low-pass filter 11 is V,
The oscillation frequency of the fundamental frequency oscillator 6 is not corrected.
【００１３】次に、任意のデータ列で構成されたＦＳＫ
信号（周波数：Ｆ±ｄｆ）が受信され、且つ基本周波数
発振器６の発振周波数がずれていない場合の動作につい
て図３で説明する。このときの分周部９の出力ＦＡ及び
逓倍部８の出力ＦＢは、 ＦＡ＝（Ｆ±ｄｆ−ＦＲ×Ｎ１）／Ｍ …（５） ＦＢ＝ＦＲ×Ｎ２ …（６） となる。この場合に周波数比較部１０の出力ＦＣは、 ＦＣ＝±ｄｆ／Ｍ …（７） となる。この出力ＦＣをローパスフィルタ１１に通す
と、その出力ＶＡは ＶＡ＝Ｖ±ｄＶ０ …（８） となる。このローパスフィルタ１１の出力はＡ／Ｄ変換
部１２を介して制御部５に取り込まれる。この場合、制
御部５ではある一定の期間に復調部４から入力されるデ
ータ列によりｄＶ０＝０となる補正が行われる。例え
ば、制御部５がＡ／Ｄ変換部１２の出力を取り込む周期
までの復調部４の復調出力を記憶しておき、この復調出
力に基づいてＡ／Ｄ変換部１２の出力を補正してｄＶ０
＝０とするようにすればよい。この場合にも基本周波数
発振器６の発振周波数の補正は行われない。Next, an FSK composed of an arbitrary data string
The operation when the signal (frequency: F ± df) is received and the oscillation frequency of the fundamental frequency oscillator 6 is not shifted will be described with reference to FIG. The output FA of the frequency divider 9 and the output FB of the frequency multiplier 8 at this time are as follows: FA = (F ± df−FR × N1) / M (5) FB = FR × N2 (6) In this case, the output FC of the frequency comparison unit 10 is FC = ± df / M (7) When this output FC is passed through the low-pass filter 11, the output VA becomes VA = V ± dV0 (8) The output of the low-pass filter 11 is taken into the control unit 5 via the A / D conversion unit 12. In this case, the control unit 5 corrects dV0 = 0 by the data string input from the demodulation unit 4 during a certain period. For example, the control unit 5 stores the demodulation output of the demodulation unit 4 up to the cycle in which the output of the A / D conversion unit 12 is captured, and the output of the A / D conversion unit 12 is corrected based on this demodulation output to correct dV0.
It suffices to set = 0. Also in this case, the oscillation frequency of the fundamental frequency oscillator 6 is not corrected.
【００１４】さらに、任意のデータ列で構成されたＦＳ
Ｋ信号（周波数：Ｆ±ｄｆ）が受信され、且つ基本周波
数発振器６の発振周波数がずれている場合（ＦＲ±ｄ
Ａ）の動作について図４で説明する。このときの分周部
９の出力ＦＡ及び逓倍部８の出力ＦＢは、 ＦＡ＝（Ｆ±ｄｆ−（ＦＲ±ｄＡ）×Ｎ１）／Ｍ …（５）’ ＦＢ＝（ＦＲ±ｄＡ）×Ｎ２ …（６）’ となる。この場合に周波数比較部１０の出力ＦＣは、 ＦＣ＝±ｄｆ／Ｍ±ｄＡ×（Ｎ１／Ｍ＋Ｎ２） …（９） となる。この出力ＦＣをローパスフィルタ１１に通す
と、その出力ＶＡは ＶＡ＝Ｖ±ｄＶ０±ｄＶ１ …（10） となる。このローパスフィルタ１１の出力はＡ／Ｄ変換
部１２を介して制御部５に取り込まれる。この場合、制
御部５ではある一定の期間に復調部４から入力されるデ
ータ列によりｄＶ０＝０となる補正が行われる。しか
し、この場合には上述のように基本周波数発振器６の発
振周波数にずれがない場合と異なり、ｄＶ１に対応する
分が残るので、制御部５ではＤ／Ａ変換部１３を介して
基本周波数発振器６から出力される基本周波数を変化さ
せて、ｄＶ１＝０（ｄＡ＝０）となる補正を行う。この
ようにすれば、受信される精度の高いＦＳＫ信号の受信
信号を用いて、自己の基本周波数発振器６の基本周波数
を補正することができ、精度の高い高価な発振器を基本
周波数発振器に使用しなくて済む。Further, an FS composed of an arbitrary data string
When the K signal (frequency: F ± df) is received and the oscillation frequency of the fundamental frequency oscillator 6 is deviated (FR ± d
The operation A) will be described with reference to FIG. The output FA of the frequency divider 9 and the output FB of the frequency multiplier 8 at this time are: FA = (F ± df− (FR ± dA) × N1) / M (5) ′ FB = (FR ± dA) × N2 … (6) '. In this case, the output FC of the frequency comparison unit 10 is FC = ± df / M ± dA × (N1 / M + N2) (9) When this output FC is passed through the low-pass filter 11, the output VA becomes VA = V ± dV0 ± dV1 (10). The output of the low-pass filter 11 is taken into the control unit 5 via the A / D conversion unit 12. In this case, the control unit 5 corrects dV0 = 0 by the data string input from the demodulation unit 4 during a certain period. However, in this case, unlike the case where there is no deviation in the oscillation frequency of the basic frequency oscillator 6 as described above, since a portion corresponding to dV1 remains, the control unit 5 causes the D / A conversion unit 13 to transmit the basic frequency oscillator. The fundamental frequency output from 6 is changed to perform correction such that dV1 = 0 (dA = 0). In this way, the fundamental frequency of the own fundamental frequency oscillator 6 can be corrected by using the received highly accurate received FSK signal, and a highly accurate and expensive oscillator can be used as the fundamental frequency oscillator. You don't have to.
【００１５】[0015]
【発明の効果】本発明は上述のように、ＲＦ部の出力を
局部発振部の出力と混合して中間周波数に変換し、この
中間周波数を増幅後に復調するＦＳＫ受信器であって、
上記局部発振部が基本周波数発振器の発振周波数を基に
して局部発振周波数を作成し、上記基本周波数発振器と
して電圧制御発振器を用い、データ無しのキャリア信号
が受信され且つ基本周波数発振器の発振周波数にずれが
ない場合に、上記基本周波数発振器の発振周波数と中間
周波数との変換周波数が一致するように基本周波数発振
器の発振周波数と中間周波数とを周波数変換する周波数
変換手段と、この周波数変換手段の夫々の出力の周波数
を比較する周波数比較手段と、周波数比較手段の出力を
電圧信号に変換する周波数／電圧変換手段と、この周波
数／電圧変換手段のデータに基づく出力を復調後のデー
タを用いて打ち消して、基本周波数発振器の発振周波数
のずれに応じた周波数／電圧変換手段の出力のみを抽出
し、その抽出出力で基本周波数発振器の発振周波数を可
変制御する制御手段とを備えているので、受信される高
精度なＳＦＫ信号の周波数を基準にして基本周波数発振
器の発振周波数を補正することができ、基本周波数発振
器として高精度の高価な発振器を用いなくても、基本周
波数発振器の発振周波数の精度を高くすることができ
る。As described above, the present invention is an FSK receiver which mixes the output of the RF section with the output of the local oscillating section to convert it to an intermediate frequency, and amplifies and demodulates this intermediate frequency.
The local oscillator creates a local oscillation frequency based on the oscillation frequency of the fundamental frequency oscillator, uses a voltage controlled oscillator as the fundamental frequency oscillator, receives a carrier signal without data, and shifts to the oscillation frequency of the fundamental frequency oscillator. When there is no, the frequency conversion means for frequency-converting the oscillation frequency of the fundamental frequency oscillator and the intermediate frequency so that the conversion frequency of the oscillation frequency of the fundamental frequency oscillator and the conversion frequency of the intermediate frequency, and each of the frequency conversion means. A frequency comparison means for comparing the frequencies of the outputs, a frequency / voltage conversion means for converting the output of the frequency comparison means into a voltage signal, and an output based on the data of the frequency / voltage conversion means are canceled by using the demodulated data. , Extracting only the output of the frequency / voltage conversion means according to the deviation of the oscillation frequency of the fundamental frequency oscillator, and the extracted output Since the control means for variably controlling the oscillation frequency of the fundamental frequency oscillator is provided, it is possible to correct the oscillation frequency of the fundamental frequency oscillator with reference to the frequency of the received highly accurate SFK signal. It is possible to increase the accuracy of the oscillation frequency of the fundamental frequency oscillator without using a highly accurate and expensive oscillator.
【図１】本発明の一実施例の構成を示すブロック図であ
る。FIG. 1 is a block diagram showing a configuration of an exemplary embodiment of the present invention.
【図２】同上において連続的にデータ”０”のＦＳＫ信
号が受信され、基本周波数発振器の基本周波数にずれが
ない場合の動作説明図である。FIG. 2 is an operation explanatory diagram when the FSK signal of data “0” is continuously received and there is no deviation in the fundamental frequency of the fundamental frequency oscillator in the above.
【図３】同上において連続的に任意のデータ列を有する
ＦＳＫ信号が受信され、基本周波数発振器の基本周波数
にずれがない場合の動作説明図である。FIG. 3 is an operation explanatory diagram when an FSK signal having an arbitrary data string is continuously received and there is no deviation in a fundamental frequency of a fundamental frequency oscillator in the above.
【図４】同上において連続的に任意のデータ列を有する
ＦＳＫ信号が受信され、基本周波数発振器の基本周波数
にずれがある場合の動作説明図である。FIG. 4 is an operation explanatory diagram when an FSK signal having an arbitrary data string is continuously received and there is a deviation in a fundamental frequency of a fundamental frequency oscillator in the above.
１ ＲＦ部 ２ ミキサ ３ ＩＦ部 ４ 復調部 ５ 制御部 ６ 基本周波数発振器 ７，８ 逓倍部 ９ 分周部 １０ 周波数比較部 １１ ローパスフィルタ 1 RF section 2 mixer 3 IF section 4 demodulation section 5 control section 6 fundamental frequency oscillator 7, 8 multiplication section 9 frequency division section 10 frequency comparison section 11 low-pass filter
【手続補正書】[Procedure amendment]
【提出日】平成４年８月３１日[Submission date] August 31, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１５[Correction target item name] 0015
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１５】[0015]
【発明の効果】本発明は上述のように、ＲＦ部の出力を
局部発振部の出力と混合して中間周波数に変換し、この
中間周波数を増幅後に復調するＦＳＫ受信器であって、
上記局部発振部が基本周波数発振器の発振周波数を基に
して局部発振周波数を作成し、上記基本周波数発振器と
して電圧制御発振器を用い、データ無しのキャリア信号
が受信され且つ基本周波数発振器の発振周波数にずれが
ない場合に、上記基本周波数発振器の発振周波数と中間
周波数との変換周波数が一致するように基本周波数発振
器の発振周波数と中間周波数とを周波数変換する周波数
変換手段と、この周波数変換手段の夫々の出力の周波数
を比較する周波数比較手段と、周波数比較手段の出力を
電圧信号に変換する周波数／電圧変換手段と、この周波
数／電圧変換手段のデータに基づく出力を復調後のデー
タを用いて打ち消して、基本周波数発振器の発振周波数
のずれに応じた周波数／電圧変換手段の出力のみを抽出
し、その抽出出力で基本周波数発振器の発振周波数を可
変制御する制御手段とを備えているので、受信される高
精度なＦＳＫ信号の周波数を基準にして基本周波数発振
器の発振周波数を補正することができ、基本周波数発振
器として高精度の高価な発振器を用いなくても、基本周
波数発振器の発振周波数の精度を高くすることができ
る。As described above, the present invention is an FSK receiver which mixes the output of the RF section with the output of the local oscillating section to convert it to an intermediate frequency, and amplifies and demodulates this intermediate frequency.
The local oscillator creates a local oscillation frequency based on the oscillation frequency of the fundamental frequency oscillator, uses a voltage controlled oscillator as the fundamental frequency oscillator, receives a carrier signal without data, and shifts to the oscillation frequency of the fundamental frequency oscillator. When there is no, the frequency conversion means for frequency-converting the oscillation frequency of the fundamental frequency oscillator and the intermediate frequency so that the conversion frequency of the oscillation frequency of the fundamental frequency oscillator and the conversion frequency of the intermediate frequency, and each of the frequency conversion means. A frequency comparison means for comparing the frequencies of the outputs, a frequency / voltage conversion means for converting the output of the frequency comparison means into a voltage signal, and an output based on the data of the frequency / voltage conversion means are canceled by using the demodulated data. , Extracting only the output of the frequency / voltage conversion means according to the deviation of the oscillation frequency of the fundamental frequency oscillator, and the extracted output Since a control means for variably controlling the oscillation frequency of the fundamental frequency oscillator, it is possible to correct the oscillation frequency of the fundamental frequency oscillator based on the frequency of the high-precision FSK signals received, as a fundamental frequency oscillator It is possible to increase the accuracy of the oscillation frequency of the fundamental frequency oscillator without using a highly accurate and expensive oscillator.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川合 正典 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 松本 一弘 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 小川 博 大阪府門真市大字門真1048番地松下電工株 式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanori Kawai 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works Co., Ltd. (72) Kazuhiro Matsumoto, 1048, Kadoma, Kadoma, Osaka Prefecture 72) Inventor Hiroshi Ogawa 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.
Claims (1)
して中間周波数に変換し、この中間周波数を増幅後に復
調するＦＳＫ受信器であって、上記局部発振部が基本周
波数発振器の発振周波数を基にして局部発振周波数を作
成し、上記基本周波数発振器として電圧制御発振器を用
い、データ無しのキャリア信号が受信され且つ基本周波
数発振器の発振周波数にずれがない場合に、上記基本周
波数発振器の発振周波数と中間周波数との変換周波数が
一致するように基本周波数発振器の発振周波数と中間周
波数とを周波数変換する周波数変換手段と、この周波数
変換手段の夫々の出力の周波数を比較する周波数比較手
段と、周波数比較手段の出力を電圧信号に変換する周波
数／電圧変換手段と、この周波数／電圧変換手段のデー
タに基づく出力を復調後のデータを用いて打ち消して、
基本周波数発振器の発振周波数のずれに応じた周波数／
電圧変換手段の出力のみを抽出し、その抽出出力で基本
周波数発振器の発振周波数を可変制御する制御手段とを
備えて成ることを特徴とするＦＳＫ受信器。1. An FSK receiver for mixing an output of an RF section with an output of a local oscillating section, converting the intermediate frequency to an intermediate frequency, demodulating the intermediate frequency after amplification, wherein the local oscillating section oscillates a fundamental frequency oscillator. Create a local oscillation frequency based on the frequency, using a voltage controlled oscillator as the fundamental frequency oscillator, when a carrier signal without data is received and there is no deviation in the oscillation frequency of the fundamental frequency oscillator, Frequency conversion means for frequency-converting the oscillation frequency and the intermediate frequency of the fundamental frequency oscillator so that the conversion frequencies of the oscillation frequency and the intermediate frequency match, and frequency comparison means for comparing the frequencies of the outputs of the frequency conversion means. , A frequency / voltage conversion means for converting the output of the frequency comparison means into a voltage signal, and an output based on the data of the frequency / voltage conversion means. Cancel using the adjusted data,
Frequency corresponding to the deviation of the oscillation frequency of the fundamental frequency oscillator /
An FSK receiver comprising: control means for extracting only the output of the voltage converting means and variably controlling the oscillation frequency of the fundamental frequency oscillator by the extracted output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4153967A JPH05347639A (en) | 1992-06-15 | 1992-06-15 | Fsk receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4153967A JPH05347639A (en) | 1992-06-15 | 1992-06-15 | Fsk receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05347639A true JPH05347639A (en) | 1993-12-27 |
Family
ID=15573990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4153967A Withdrawn JPH05347639A (en) | 1992-06-15 | 1992-06-15 | Fsk receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05347639A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08162947A (en) * | 1994-12-09 | 1996-06-21 | Nec Corp | Microcomputer-controlled piezoelectric oscillator |
-
1992
- 1992-06-15 JP JP4153967A patent/JPH05347639A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08162947A (en) * | 1994-12-09 | 1996-06-21 | Nec Corp | Microcomputer-controlled piezoelectric oscillator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990831 |