JPS60173960A - Msk modulator - Google Patents
Msk modulatorInfo
- Publication number
- JPS60173960A JPS60173960A JP2895684A JP2895684A JPS60173960A JP S60173960 A JPS60173960 A JP S60173960A JP 2895684 A JP2895684 A JP 2895684A JP 2895684 A JP2895684 A JP 2895684A JP S60173960 A JPS60173960 A JP S60173960A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- data
- output
- center
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
- H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
- H04L27/2014—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes in a piecewise linear manner during each symbol period, e.g. minimum shift keying, fast frequency shift keying
Abstract
Description
【発明の詳細な説明】
産業−にの利用分野
本発明は環境条件等の変＠による電圧ｉｌｒ！Ｉ御発振
器の発振周波数の変動を小さくするための自動周波数制
御（ＡＦＣ）回路を備えたＭＳＫ変調器に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Application of the Invention The present invention is applicable to the industrial field of application. The present invention relates to an MSK modulator equipped with an automatic frequency control (AFC) circuit for reducing fluctuations in the oscillation frequency of an I-controlled oscillator.
従来例の画成とその問題点 従来例のＭＳＫ変調器の構成を第１図に示す。Definition of conventional examples and their problems FIG. 1 shows the configuration of a conventional MSK modulator.
第１図において１は直流レベルシフト回ｈ′？ｆ ％
２ ｉ’：、Ｉ、電圧制御発振器（以下ＶＣＯと略す）
である、第１図に示すように従来のＭＳＫ変調器にＪ、
・いてｋＡ、送信データを直流レベルシフト回１１！ｉ
ｊ Ｉ ＶＣ入力しその出力をＶＣＯ２に入力し、ＭＳ
Ｋ変、ｉ’ＡＩ益出力の中心周波数が所定の値となる様
ＶＣ直流レベルシフト回路１の基準電圧を設定している
。この３１：うに構成されたＭＳＫ変調器ではＪ阜Ｊｉ
、Ｂ条件等の変１助によりＶＣＯ２の発振周波数が変動
すると、こＩ′ｌがＭＳＫ変調器出力周波数の変１１の
となっでｌ見われでくるという欠点をもっていた。In FIG. 1, 1 is the DC level shift time h'? f%
2 i':, I, voltage controlled oscillator (hereinafter abbreviated as VCO)
As shown in Fig. 1, the conventional MSK modulator has J,
・Without kA, DC level shift of transmission data 11 times! i
j I VC input and its output to VCO2, MS
The reference voltage of the VC DC level shift circuit 1 is set so that the center frequency of the K change and i'AI gain outputs becomes a predetermined value. In this MSK modulator configured as 31:
When the oscillation frequency of the VCO 2 changes due to changes in the , B conditions, etc., this I'l becomes visible next to the change in the MSK modulator output frequency.
発明の目的
本発明は環境条件等の変動によるｖ ｃ Ｏ１，／）発
振周波数の変動によるｉｖＩ□ＳＫ変Ｎ＋ｊｌ ”ｌｈ
の出力周波数の変動を小さくし安定したＭＳＫ変８周を
行うことを可能としたｌｖｆ Ｓ Ｎ変調器を提供する
ことを１酊白とする。Purpose of the Invention The present invention is directed to the change of ivI□SK due to variation in v c O1,/) oscillation frequency due to variation in environmental conditions, etc. N+jl ”lh
Our objective is to provide an lvf S N modulator that can reduce fluctuations in the output frequency and perform stable MSK modulation by eight cycles.
発明の構成
本発明は変調データを１頁流電圧変１Ｉ）Ｑする１ｒ１
流レベルシフト回路とＶＣＯに加えて、変ＭＭＩ益出力
全遅延検波する遅延検波回路、ローパスフィルタ及び１
αα流暢器を備えたＭＳＫ変調器であり、ｖＣＯの発振
周波数の変動によるＭ’ＳＫ変調器出力周波数の変動を
小さくできるものである。Structure of the Invention The present invention converts modulation data into one page current voltage change 1I)Q1r1
In addition to the current level shift circuit and VCO, a delay detection circuit for variable MMI gain output total delay detection, a low-pass filter and 1
This is an MSK modulator equipped with an αα fluency device, which can reduce fluctuations in the M'SK modulator output frequency due to fluctuations in the oscillation frequency of the vCO.
貧於邊１■概帆
第２図に本発明の一実施例におけるＭＳＫ変調器の構成
を示す。第２図において、１は直流レベルシフト回路、
２はＶＣＯ１３は遅延検波回路、４はローパスフィルタ
、５は＠流暢幅器である。Figure 2 shows the configuration of an MSK modulator in an embodiment of the present invention. In FIG. 2, 1 is a DC level shift circuit;
2 is a VCO 13 which is a delay detection circuit, 4 is a low-pass filter, and 5 is a @fluency amplifier.
以上のように構成された本実施例のｈｉ Ｓ Ｋ変調器
の動作を以下に説明する。丑ず１゛″、”０゛′の変調
データは直流レベルシフト回路１により所定の電圧■
を中心とする“１°”、°“０゛のデータに直流電圧変
換さ扛、このデータがＶＣＯ２に入力され、１ｖｉｓ
Ｋ変調が行われる。このとき■Ｃ０２出力は中心周波数
が入力の中心電圧■。Ｋ相当し変調データの振幅に対応
した周波数偏移を持つｙｉ Ｓ Ｋ変調波が出力される
。この１ＶｆｓＫ変調波が遅延検波回路３にて遅延検波
され復調した変調データをローパスフィルタ４にて平滑
か行わｎ直流電圧のみを取り出し、直流増幅回路５に入
力される。そして直流増幅回路５により直流電圧が増幅
されその出力は直流レベルシフト回路１の基準′電圧と
なる。ここで直流レベルシフト回路１は入力の変調デー
タの中心電圧が一定の場合基準電圧が上がると、直流レ
ベルシフ ＋−１’ｌｋ’？’ｒ １の出力何月の中心
電圧は下がるものとする。一方、遅延検波回路３出力の
後調信号の対地電圧ｒ」、人力ＭＳＫ変調波の中心周波
数により変動し、変調波の中心１ｉ’ｄ波数が上がると
前記対地電圧は上がる。The operation of the hi S K modulator of this embodiment configured as described above will be described below. The modulation data of ``1'' and ``0'' are set to a predetermined voltage by the DC level shift circuit 1.
The DC voltage is converted into data of "1°" and "0" centered on , this data is input to VCO2, and 1vis
K modulation is performed. At this time, the center frequency of ■C02 output is the center voltage of the input. A yi S K modulated wave corresponding to K and having a frequency shift corresponding to the amplitude of the modulated data is output. This 1VfsK modulated wave is delayed detected by a delay detection circuit 3, and the demodulated modulated data is smoothed by a low-pass filter 4 to extract only n DC voltages, which are input to a DC amplifier circuit 5. Then, the DC voltage is amplified by the DC amplifier circuit 5, and its output becomes the reference voltage of the DC level shift circuit 1. Here, when the center voltage of the input modulation data is constant, the DC level shift circuit 1 shifts the DC level when the reference voltage increases +-1'lk'? It is assumed that the center voltage of the output of 'r 1 decreases in each month. On the other hand, the ground voltage r'' of the after-tone signal output from the delay detection circuit 3 varies depending on the center frequency of the manually-powered MSK modulated wave, and as the center 1i'd wave number of the modulated wave increases, the ground voltage increases.
いま環境条件等の変動によりＶＣＯ２の中心周波数が上
がったとすると遅延検波回路３出力の直流電圧は一ヒが
りローパスフィルタ４出力のｉｆ−、Ｅ ＃ｉｊ電圧も
上がり、直流増幅回路５の出力電圧も上がる。Now, if the center frequency of VCO 2 increases due to changes in environmental conditions, etc., the DC voltage at the output of the delay detection circuit 3 will drop by a bit, the if-, E #ij voltage at the output of the low-pass filter 4 will also rise, and the output voltage of the DC amplifier circuit 5 will also rise. Go up.
すると直流レベルシフト回路１は基準電圧が上がったの
でその出力データの中心電圧は下がり、その結果ＶＣＯ
２の中心周波数は下がる。このようにＶＣＯ２出力の中
心周波数のす′Ｊ′Ｌを遅延検波回路３．ローパスフィ
ルタ４．直流噌幅滞５によりその周波数ずれに比例した
変面電圧に変換し、こＩｎ−”Ｆｒ： ＠にレベルシフ
ト回路１の基準電圧とすることに」：すＶＣ０２人力の
中心電圧を制御しＶＣＯの中心周波数の変動によるＭＳ
Ｋ変調器出力の中心周波数の変動を小さくすることがで
きる発明の効果
本発明は直流レベルシフト回路とＶＣＯにより構成され
るＭＳＫ変調器に遅延検波回路、ローノースフィルタ、
直流増幅回路を設けることにより、Ｖ’ ＣＯの中心局
Ｖ数の変動によるＭＳＫ変調器の出力周波数の変動を小
さくすることができる。Then, since the reference voltage of the DC level shift circuit 1 has increased, the center voltage of its output data has decreased, and as a result, the VCO
The center frequency of 2 is lowered. In this way, the center frequency S'J'L of the VCO2 output is determined by the delay detection circuit 3. Low pass filter 4. It is converted into a variable voltage proportional to the frequency deviation by the DC width difference 5, and is used as the reference voltage of the level shift circuit 1 by controlling the center voltage of the VCO. MS due to fluctuations in the center frequency of
Effects of the invention that can reduce fluctuations in the center frequency of the K modulator output The present invention provides an MSK modulator composed of a DC level shift circuit and a VCO, a delay detection circuit, a low-north filter,
By providing a DC amplifier circuit, it is possible to reduce fluctuations in the output frequency of the MSK modulator due to fluctuations in the center station V number of V'CO.
第１図は従来例のＭＳＫ変調器の構成を示すブロック図
、第２図は本発明の一実施例におけるＭＳＫ変調器の構
成を示すブロック図である。
１１４．・・・直流レベルシフト回路、２・・・・・・
電圧制御発振器（ＶＣＯ）、３・・・・・・遅延検波回
路、４・・・・・・ローパスフィルタ、５・・・・・・
直流増幅器。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図FIG. 1 is a block diagram showing the configuration of a conventional MSK modulator, and FIG. 2 is a block diagram showing the configuration of an MSK modulator in an embodiment of the present invention. 114. ...DC level shift circuit, 2...
Voltage controlled oscillator (VCO), 3... Delay detection circuit, 4... Low pass filter, 5...
DC amplifier. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2
Claims (1)
ルシフトさせ、前記レベルシフトした変調データを電圧
制御発振器に入力してｉｖｉ Ｓ Ｋ変調波を出力し、
前記ｉｖｒ Ｓ Ｋ変調波を遅延検波回路により検波し
、この検波出力信号の直流電圧を前記ｉｎ流レしルンフ
ト回路の基準電圧とし、前記電圧側併発＆器の発振周波
数を制御することを特徴とするＭＳＮ変調器。e IAI data is level-shifted by a DC level shift circuit, and the level-shifted modulation data is input to a voltage controlled oscillator to output an ivi S K modulated wave;
The ivr S K modulated wave is detected by a delay detection circuit, and the DC voltage of the detected output signal is used as a reference voltage of the in-current Runft circuit to control the oscillation frequency of the voltage side simultaneous generator & MSN modulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2895684A JPS60173960A (en) | 1984-02-17 | 1984-02-17 | Msk modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2895684A JPS60173960A (en) | 1984-02-17 | 1984-02-17 | Msk modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60173960A true JPS60173960A (en) | 1985-09-07 |
Family
ID=12262864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2895684A Pending JPS60173960A (en) | 1984-02-17 | 1984-02-17 | Msk modulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60173960A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5585161A (en) * | 1978-12-21 | 1980-06-26 | Nippon Telegr & Teleph Corp <Ntt> | Msk modulation unit |
-
1984
- 1984-02-17 JP JP2895684A patent/JPS60173960A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5585161A (en) * | 1978-12-21 | 1980-06-26 | Nippon Telegr & Teleph Corp <Ntt> | Msk modulation unit |
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