JPH066182A - Frequency sweep range controller - Google Patents
Frequency sweep range controllerInfo
- Publication number
- JPH066182A JPH066182A JP15719792A JP15719792A JPH066182A JP H066182 A JPH066182 A JP H066182A JP 15719792 A JP15719792 A JP 15719792A JP 15719792 A JP15719792 A JP 15719792A JP H066182 A JPH066182 A JP H066182A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- oscillator
- output
- low
- variable
- 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.)
- Withdrawn
Links
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は周波数スイープ範囲制御
装置に関し、特に中間周波数信号を復調器に入力し復調
するためのローカル発振器をスイープする際に、ローカ
ル発振器の周波数スイープ範囲制御を高精度に行う周波
数スイープ範囲制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency sweep range control device, and more particularly, to a frequency sweep range control of a local oscillator with high accuracy when sweeping a local oscillator for inputting an intermediate frequency signal to a demodulator for demodulation. The present invention relates to a frequency sweep range control device.
【0002】[0002]
【従来の技術】従来この種の周波数スイープ範囲制御装
置は図2に示すように、復調器2に受信IF信号を入力
し、水晶発振型電圧制御発振器(VCXOという)であ
る周波数可変発振器1の出力をローカル発振信号として
位相検波する。この復調信号から同期信号検出器3で同
期信号を抽出する。もし同期はずれの場合には、同期引
き込みを行うために周波数制御器20で周波数可変発振
器1の周波数を可変して、同期引き込みの周波数となる
ように制御している。この従来例では、周波数可変発振
器1の周波数を監視する発振周波数測定装置を備えず
に、周波数制御器20が周波数可変発振器1の発振周波
数を制御している。他の従来例としては図3に示すよう
に、周波数可変発振器1の発振信号を1/N(Nは2以
上の整数)分周する分周器4と高精度の周波数測定器3
0とこの周波数測定情報を入力して所定のスイープ範囲
内にあるかどうかを判定するスイープ範囲判定器10と
を備えている(例えば特願平4−40363参照)。
今、図4に示すスイープ範囲を規定する説明図に示すよ
うに、中心周波数f0(例えば100MHz)に対して
f0±50KHzがスイープ範囲とすれば、(f0−5
1)KHz以下又は(f0+51)KHz以上はスイー
プ禁止範囲となる。図5の従来例の周波数測定器30
は、50kHzと51kHzとの周波数差である1kH
zの違いを認識する必要があり、この1kHzは、10
0MHzに対して、1kHz/100MHz=10pp
mであるから、周波数測定器30の測定精度はこの10
倍程度の1ppmが要求される。2. Description of the Related Art Conventionally, as shown in FIG. 2, a frequency sweep range control device of this type inputs a received IF signal to a demodulator 2 and controls a frequency variable oscillator 1 which is a crystal oscillation type voltage controlled oscillator (VCXO). The output is phase-detected as a local oscillation signal. The sync signal detector 3 extracts the sync signal from the demodulated signal. If the synchronization is lost, the frequency of the variable frequency oscillator 1 is varied by the frequency controller 20 in order to perform the synchronization pull-in, and the frequency is controlled to be the synchronization pull-in frequency. In this conventional example, the frequency controller 20 controls the oscillation frequency of the variable frequency oscillator 1 without providing an oscillation frequency measuring device for monitoring the frequency of the variable frequency oscillator 1. As another conventional example, as shown in FIG. 3, a frequency divider 4 for dividing an oscillation signal of a frequency variable oscillator 1 by 1 / N (N is an integer of 2 or more) and a highly accurate frequency measuring device 3 are provided.
0 and a sweep range determiner 10 for inputting this frequency measurement information and determining whether or not it is within a predetermined sweep range (see, for example, Japanese Patent Application No. 404033).
Now, as shown in the explanatory diagram defining the sweep range shown in FIG. 4, if f0 ± 50 KHz is the sweep range with respect to the center frequency f0 (for example, 100 MHz), (f0-5
1) KHz or less or (f0 + 51) KHz or more is the sweep prohibited range. The conventional frequency measuring device 30 of FIG.
Is 1 kHz, which is the frequency difference between 50 kHz and 51 kHz
It is necessary to recognize the difference in z, and this 1 kHz is 10
1 kHz / 100 MHz = 10 pp for 0 MHz
Therefore, the measurement accuracy of the frequency measuring device 30 is 10
About twice as high as 1 ppm is required.
【0003】[0003]
【発明が解決しようとする課題】上述した従来の図2に
示す周波数スイープ範囲制御装置では、復調器のローカ
ル発振器として通常使われるVCXOは、図5に示すよ
うに規定のスイープ範囲をAとすると、VCXOの制御
電圧を外部から与える電圧を変更することにより発振周
波数を変えることができるが、周波数可変のための精度
が悪く、かつ、発振周波数の温度変化及び経年変化も大
きく(図5のB1〜B2参照)、入力電圧(制御電圧)
と出力である発振周波数との関係を一意にする事は技術
上不可能となる欠点がある。さらに温度変化や経年変化
による周波数変化を認識する周波数測定手段がないの
で、正確な発振周波数が不明なまま、周波数可変発振器
の周波数制御電圧をある一定の範囲で振ることになり、
実際の周波数スイープ範囲を正確に定めることが不可能
である。In the conventional frequency sweep range control device shown in FIG. 2 described above, a VCXO normally used as a local oscillator of a demodulator has a prescribed sweep range A as shown in FIG. , The oscillation frequency can be changed by changing the voltage to which the control voltage of the VCXO is applied from the outside, but the accuracy for changing the frequency is poor, and the temperature change and the secular change of the oscillation frequency are large (B1 in FIG. 5). ~ B2), input voltage (control voltage)
It is technically impossible to make the relationship between the output and the oscillation frequency as the output unique. Furthermore, since there is no frequency measuring means for recognizing frequency changes due to temperature changes and aging changes, the frequency control voltage of the variable frequency oscillator will be swung within a certain range, while the exact oscillation frequency remains unknown.
It is impossible to accurately determine the actual frequency sweep range.
【0004】次に図3のような周波数制御器では周波数
スイープ範囲を正確に定めることができるが、そのため
には周波数測定器に高精度が要求される欠点がある。Next, in the frequency controller as shown in FIG. 3, the frequency sweep range can be accurately determined, but for that purpose, there is a drawback that the frequency measuring device is required to have high accuracy.
【0005】本発明の目的は、周波数可変発振器の周波
数を直接測定するのでなく、低周波低精度周波数測定器
でも、復調器の周波数スイープ範囲を正確に制御するこ
とを可能とした周波数スイープ範囲制御装置を提供する
ことにある。An object of the present invention is not to directly measure the frequency of the variable frequency oscillator, but to control the frequency sweep range of the demodulator accurately even with a low frequency and low precision frequency measuring instrument. To provide a device.
【0006】[0006]
【課題を解決するための手段】本発明の周波数スイープ
範囲制御装置は、受信IF信号を入力し復調する復調器
と、制御端子からの制御電圧により周波数を移動又はス
イープできる周波数可変発振器と、前記復調器出力から
受信IF信号の中の同期信号を検出する同期信号検出器
と、周波数精度の高い高精度周波数発振器と、前記周波
数可変発振器出力と前記高精度周波数発振器の出力とを
混合して差周波数信号を出力するミキサーと、前記差周
波数信号を取り出す低周波ろ波器と、前記低周波ろ波器
の出力周波数を測定する低周波の周波数測定器と、前記
低周波の周波数測定器での測定値が、スイープ周波数範
囲内か否かを判定するスイープ範囲判定器と、前記スイ
ープ範囲判定器の判定結果及び前記同期信号検出器の出
力に基づいて前記周波数可変発振器の制御端子に制御電
圧を供給する周波数制御器とを有する。A frequency sweep range control device of the present invention comprises a demodulator for receiving and demodulating a received IF signal, a variable frequency oscillator capable of moving or sweeping a frequency by a control voltage from a control terminal, A synchronization signal detector that detects a synchronization signal in the received IF signal from the demodulator output, a high-precision frequency oscillator with high frequency accuracy, and the frequency variable oscillator output and the output of the high-precision frequency oscillator are mixed to obtain a difference. A mixer that outputs a frequency signal, a low-frequency filter that extracts the difference frequency signal, a low-frequency frequency measuring device that measures the output frequency of the low-frequency filter, and a low-frequency frequency measuring device The measured value is a sweep range determiner for determining whether it is within the sweep frequency range, the determination result of the sweep range determiner, and the output based on the output of the synchronization signal detector. And a frequency controller for supplying a control voltage to the control terminal of the wave number variable oscillator.
【0007】[0007]
【作用】本発明によれば、周波数可変発振器の発振周波
数を直接周波数測定器で測定する代わりに、周波数可変
発振器と高精度周波数可変発振器との周波数差のみを測
定することにより、低周波低精度周波数測定器を用いて
も、高精度周波数発振器と同等の精度で正確な復調器の
スイープ周波数の制御を実現できる。According to the present invention, instead of directly measuring the oscillation frequency of the variable frequency oscillator with the frequency measuring instrument, by measuring only the frequency difference between the variable frequency oscillator and the highly accurate frequency variable oscillator, the low frequency low precision Even if the frequency measuring device is used, it is possible to realize accurate control of the sweep frequency of the demodulator with the same accuracy as that of the high-precision frequency oscillator.
【0008】[0008]
【実施例】次に、本発明について図面を参照して説明す
る。図1は本発明の一実施例のブロック図である。図1
の実施例は、VCXO等の周波数可変発振器1、周波数
可変発振器1の出力をローカル周波数として受信IF信
号を復調する復調器2、復調器2の出力である受信信号
から同期信号を検出する同期信号検出器3、周波数可変
発振器1の出力を1/N分周する分周器4、周波数精度
の高い高精度周波数発振器5、高精度周波数発振器5の
出力を1/M(Mは2以上の整数)分周する分周器6、
分周器4と分周器6との出力をかけ算し低域ろ波器8へ
出力するミキサー7、ミキサー7の出力のうち分周器4
と分周器6との出力差である成分のみを取り出す低域ろ
波器(LPF)8、このLPF8の出力を周波数測定す
る低周波低精度周波数測定器9、低周波低精度周波数測
定器9の測定値に基づいて周波数可変発振器1の発振周
波数がスイープ範囲内にあるか否かを判定するスイープ
範囲判定器10、同期信号検出器3が同期信号を検出し
ていないときに、スイープ範囲判定器10の結果に基づ
いて周波数可変発振器1の周波数を制御する周波数制御
器11から構成される。なお、分周器4と分周器6は必
要なときのみ挿入すれば良い。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. Figure 1
In the embodiment, a frequency variable oscillator 1 such as a VCXO, a demodulator 2 that demodulates a received IF signal by using the output of the frequency variable oscillator 1 as a local frequency, and a synchronization signal that detects a synchronization signal from the received signal that is the output of the demodulator 2 The detector 3, the frequency divider 4 for dividing the output of the variable frequency oscillator 1 by 1 / N, the high precision frequency oscillator 5 with high frequency precision, and the output of the high precision frequency oscillator 5 are 1 / M (M is an integer of 2 or more). ) Dividing frequency divider 6,
The mixer 7 that multiplies the outputs of the frequency divider 4 and the frequency divider 6 and outputs the result to the low-pass filter 8, the frequency divider 4 of the outputs of the mixer 7.
Low-pass filter (LPF) 8 for extracting only a component that is an output difference between the frequency divider 6 and the frequency divider 6, a low-frequency low-precision frequency measuring instrument 9 for measuring the frequency of the output of the LPF 8, a low-frequency low-precision frequency measuring instrument 9 The sweep range determiner 10 that determines whether the oscillation frequency of the variable frequency oscillator 1 is within the sweep range based on the measured value of 1 and the sync signal detector 3 does not detect the sync signal. The frequency controller 11 controls the frequency of the variable frequency oscillator 1 based on the result of the frequency controller 10. The frequency divider 4 and the frequency divider 6 may be inserted only when necessary.
【0009】次に本実施例の動作を説明する。周波数可
変発振器1の発振周波数を100MHz±100kHz
とし、高精度周波数発振器5の発振周波数を100MH
z±10Hzとし、スイープ範囲を図4で説明したよう
に、±50kHz以上51kHz以下とした場合に、周
波数測定器は前述したように、100.050MHzと
100.051MHzとの差を認識する必要があるため
周波数測定器の精度は1ppm程度が要求される。今周
波数可変発振器1と高精度周波数発振器5との周波数差
を測定する場合に、周波数測定器は2つの発振器の周波
数差である50kHz程度という低周波を測定できれば
良い。また、そのときに要求される周波数測定器の精度
は、従来例で例示した高精度周波数発振器5と同等の精
度で測定するとしても、10Hz/50kHz=200
ppmあれば十分である。通常入手できる水晶発振子の
うち一番精度の悪いものでも±100ppmであること
を考えれば、この200ppmという値は容易に達成で
きる。周波数可変発振器1と高精度周波数発振器5との
周波数差を必要に応じて分周器4及び6を用いて測定す
ることにより、低周波低精度周波数測定器9でも精度の
高いスイープ範囲制御が可能となる。Next, the operation of this embodiment will be described. The oscillation frequency of the variable frequency oscillator 1 is 100 MHz ± 100 kHz
And the oscillation frequency of the high precision frequency oscillator 5 is 100 MHz.
When the sweep range is set to z ± 10 Hz and the sweep range is set to ± 50 kHz or more and 51 kHz or less as described in FIG. 4, the frequency measuring device needs to recognize the difference between 100.050 MHz and 100.051 MHz as described above. Therefore, the accuracy of the frequency measuring device is required to be about 1 ppm. Now, when measuring the frequency difference between the variable frequency oscillator 1 and the high-precision frequency oscillator 5, the frequency measuring device only needs to be able to measure a low frequency of about 50 kHz, which is the frequency difference between the two oscillators. Further, the accuracy of the frequency measuring device required at that time is 10 Hz / 50 kHz = 200 even if it is measured with the same accuracy as the high accuracy frequency oscillator 5 exemplified in the conventional example.
ppm is sufficient. This value of 200 ppm can be easily achieved, considering that even the most inaccurate crystal oscillator is usually ± 100 ppm. By measuring the frequency difference between the variable frequency oscillator 1 and the high-precision frequency oscillator 5 using the frequency dividers 4 and 6 as necessary, the low-frequency low-precision frequency measuring instrument 9 can also perform highly accurate sweep range control. Becomes
【0010】[0010]
【発明の効果】以上説明したように本発明は、周波数可
変発振器と高精度周波数発振器との周波数差のみを周波
数測定器で測定することにより、周波数測定器の測定精
度が低くても高精度周波数発振器と同等の測定精度での
測定が可能となり、この測定結果を用いて正確な周波数
スイープ範囲制御が可能となるという効果を有する。As described above, according to the present invention, by measuring only the frequency difference between the variable frequency oscillator and the high precision frequency oscillator with the frequency measuring instrument, the high precision frequency can be obtained even if the measurement accuracy of the frequency measuring instrument is low. It is possible to perform measurement with the same measurement accuracy as that of the oscillator, and it is possible to perform accurate frequency sweep range control using the measurement result.
【図1】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of an embodiment of the present invention.
【図2】従来の周波数スイープ範囲制御装置のブロック
図である。FIG. 2 is a block diagram of a conventional frequency sweep range control device.
【図3】従来例の他の1例を示すブロック図である。FIG. 3 is a block diagram showing another example of a conventional example.
【図4】本実施例と従来例に共通のスイープ範囲の説明
図である。FIG. 4 is an explanatory diagram of a sweep range common to this embodiment and a conventional example.
【図5】従来例の特性を示す説明図である。FIG. 5 is an explanatory diagram showing characteristics of a conventional example.
1 周波数可変発振器 2 復調器 3 同期信号検出器 4,6 分周器 5 高精度周波数発振器 7 ミキサー 8 低域ろ波器(LPF) 9 低周波低精度周波数測定器 10 スイープ範囲判定器 11,20 周波数制御器 30 周波数測定器 1 frequency variable oscillator 2 demodulator 3 synchronization signal detector 4, 6 frequency divider 5 high precision frequency oscillator 7 mixer 8 low pass filter (LPF) 9 low frequency low precision frequency measuring instrument 10 sweep range determiner 11, 20 Frequency controller 30 Frequency measuring instrument
Claims (3)
と、制御端子からの制御電圧により周波数を移動又はス
イープできる周波数可変発振器と、前記復調器出力から
受信IF信号の中の同期信号を検出する同期信号検出器
と、周波数精度の高い高精度周波数発振器と、前記周波
数可変発振器出力と前記高精度周波数発振器の出力とを
混合して差周波数信号を出力するミキサーと、前記差周
波数信号を取り出す低周波ろ波器と、前記低周波ろ波器
の出力周波数を測定する低周波の周波数測定器と、前記
低周波の周波数測定器での測定値が、スイープ周波数範
囲内か否かを判定するスイープ範囲判定器と、前記スイ
ープ範囲判定器の判定結果及び前記同期信号検出器の出
力に基づいて前記周波数可変発振器の制御端子に制御電
圧を供給する周波数制御器とを有することを特徴とする
周波数スイープ範囲制御装置。1. A demodulator for receiving and demodulating a received IF signal, a frequency variable oscillator capable of moving or sweeping a frequency by a control voltage from a control terminal, and a sync signal in the received IF signal detected from the output of the demodulator. A synchronization signal detector, a high-precision frequency oscillator with high frequency accuracy, a mixer for mixing the output of the variable frequency oscillator and the output of the high-precision frequency oscillator to output a difference frequency signal, and extracting the difference frequency signal A low-frequency filter, a low-frequency frequency measuring device that measures the output frequency of the low-frequency filter, and a measurement value of the low-frequency frequency measuring device, it is determined whether or not within the sweep frequency range A sweep range determiner, and a frequency control that supplies a control voltage to the control terminal of the frequency variable oscillator based on the determination result of the sweep range determiner and the output of the synchronization signal detector. A frequency sweep range control device having a controller.
発振器の発振周波数を分周する分周器と、前記高精度周
波数発振器の発振周波数を分周する分周器とを備えたこ
とを特徴とする請求項1記載の周波数スイープ範囲制御
装置。2. A frequency divider that divides the oscillation frequency of the variable frequency oscillator before the mixer input, and a divider that divides the oscillation frequency of the high-precision frequency oscillator. The frequency sweep range control device according to claim 1.
周波数可変発振器のスイープ出力の周波数をf1±△f
とし、前記高精度周波数発振器出力の周波数をf2とす
ると、(f1±△f)とf2との差周波数を測定する前
記周波数測定器の測定精度を△fに対して200ppm
以内に設定することを特徴とする請求項1記載の周波数
スイープ範囲制御装置。3. The sweep frequency swing width is Δf, and the sweep output frequency of the variable frequency oscillator is f1 ± Δf.
And the frequency of the high-precision frequency oscillator output is f2, the measurement accuracy of the frequency measuring device for measuring the difference frequency between (f1 ± Δf) and f2 is 200 ppm with respect to Δf.
The frequency sweep range control device according to claim 1, wherein the frequency sweep range control device is set within the range.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15719792A JPH066182A (en) | 1992-06-17 | 1992-06-17 | Frequency sweep range controller |
US07/998,397 US5335348A (en) | 1992-01-10 | 1992-12-29 | Radio receiver having frequency sweep control apparatus |
CA002086644A CA2086644C (en) | 1992-01-10 | 1993-01-04 | Frequency sweep control apparatus |
AU31073/93A AU659381B2 (en) | 1992-01-10 | 1993-01-06 | Radio receiver having frequency sweep control apparatus |
DE69326785T DE69326785T2 (en) | 1992-01-10 | 1993-01-07 | Frequency sweep control device |
NO930033A NO303099B1 (en) | 1992-01-10 | 1993-01-07 | Device with controlled frequency sweep |
EP93100146A EP0551106B1 (en) | 1992-01-10 | 1993-01-07 | Frequency sweep control apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15719792A JPH066182A (en) | 1992-06-17 | 1992-06-17 | Frequency sweep range controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH066182A true JPH066182A (en) | 1994-01-14 |
Family
ID=15644330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15719792A Withdrawn JPH066182A (en) | 1992-01-10 | 1992-06-17 | Frequency sweep range controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH066182A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6033043A (en) * | 1995-12-27 | 2000-03-07 | Hitachi Construction Machinery Co., Ltd. | Crawler type drive apparatus |
KR20100136839A (en) * | 2009-06-19 | 2010-12-29 | 엘지전자 주식회사 | A cooking apparatus using microwave |
-
1992
- 1992-06-17 JP JP15719792A patent/JPH066182A/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6033043A (en) * | 1995-12-27 | 2000-03-07 | Hitachi Construction Machinery Co., Ltd. | Crawler type drive apparatus |
KR20100136839A (en) * | 2009-06-19 | 2010-12-29 | 엘지전자 주식회사 | A cooking apparatus using microwave |
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Legal Events
Date | Code | Title | Description |
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A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990831 |