JPS62274905A - Amplitude modulation system - Google Patents
Amplitude modulation systemInfo
- Publication number
- JPS62274905A JPS62274905A JP11949986A JP11949986A JPS62274905A JP S62274905 A JPS62274905 A JP S62274905A JP 11949986 A JP11949986 A JP 11949986A JP 11949986 A JP11949986 A JP 11949986A JP S62274905 A JPS62274905 A JP S62274905A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- modulated
- modulator
- amplitude
- amplitude modulation
- 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
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 16
- 230000005236 sound signal Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Landscapes
- Amplitude Modulation (AREA)
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
〔概要〕
振幅変調方式であって、変調信号を高周波信号に振幅変
調を行なう被変調器の出力振幅変調信号を検波する手段
と、該検波手段の検波信号により前記変調信号を整形す
る手段とを設けた構成とし、振幅変調を行なうに際して
変調回路で発生ずる変調歪を少なくすることを可能とし
ている。[Detailed Description of the Invention] 3. Detailed Description of the Invention [Summary] Means for detecting an output amplitude modulation signal of a modulated device that is an amplitude modulation method and performs amplitude modulation of a modulation signal into a high frequency signal, and the detection method. The structure includes means for shaping the modulated signal using the detection signal of the means, and it is possible to reduce modulation distortion generated in the modulation circuit when performing amplitude modulation.
［産業上の利用分野〕
本発明は無線送信機の振幅変調方式に関し、特に振幅変
調時に発生ずる変調歪を少なくするようにした振幅変調
方式に関するものである。[Industrial Field of Application] The present invention relates to an amplitude modulation method for a radio transmitter, and more particularly to an amplitude modulation method that reduces modulation distortion that occurs during amplitude modulation.
第４図は従来の振幅変調方式のブロック図、第５図は従
来の振幅変調方式の信号波形図を示している。FIG. 4 is a block diagram of a conventional amplitude modulation method, and FIG. 5 is a signal waveform diagram of the conventional amplitude modulation method.
第４図に示すように、従来の振幅変調方式は、オーディ
オ信号を増幅する変調器１と、高周波増幅器２で増幅さ
れた高周波信号を変調器１の出力信号によって振幅変調
する被変調器３とより構成されている。As shown in FIG. 4, the conventional amplitude modulation method includes a modulator 1 that amplifies an audio signal, and a modulator 3 that amplitude modulates the high frequency signal amplified by a high frequency amplifier 2 using the output signal of the modulator 1. It is composed of
その動作を第５図の信号波形図を参照して説明する。The operation will be explained with reference to the signal waveform diagram in FIG.
第５同人に示す、例えば低周波の正弦波信号が変調器１
により増幅され歪の少ない第５図Ｂの正弦波の変調信号
となって被変調器３に入力される。For example, a low frequency sine wave signal shown in the fifth doujin is transmitted to the modulator 1.
The signal is amplified by the sine wave modulation signal shown in FIG. 5B with little distortion, and is input to the modulator 3.
被変調器３は、高周波増幅器２を通って増幅された高周
波信号を変調器１より出力される変調波Ｂで振幅変調し
、第５図Ｃの振幅変調信号を作成し、アンテナを介して
外部に送信する。The modulated device 3 amplitude-modulates the high-frequency signal amplified through the high-frequency amplifier 2 with the modulated wave B output from the modulator 1, creates the amplitude-modulated signal shown in FIG. Send to.
上記の振幅変調方式における被変調器３の変調特性は、
第６図に示すように、一般に入力レベルに対して出力レ
ベルが直線状（Ｂ特性）とならず、出力の高いところで
飽和した湾曲カーブ（Ａ特性）となる。The modulation characteristics of the modulated device 3 in the above amplitude modulation method are as follows:
As shown in FIG. 6, in general, the output level is not linear with respect to the input level (B characteristic), but becomes a curved curve (A characteristic) that is saturated at a high output.
それがために、被変調器３の出力振幅変調波形は、第５
図Ｃに示すように、Ｃ１において正弦波の卯が平坦とな
って歪を発生するといった問題がある。Therefore, the output amplitude modulation waveform of the modulated device 3 is
As shown in Figure C, there is a problem in that the curve of the sine wave becomes flat in C1, causing distortion.
本発明はこのような点に鑑みて創作されたもので、振幅
変調時に発生する振幅変調信号の歪みを少なくすること
ができる振幅変調方式を提供することを目的としている
。The present invention was created in view of these points, and an object of the present invention is to provide an amplitude modulation method that can reduce distortion of an amplitude modulation signal that occurs during amplitude modulation.
上記の問題点を解決するため、本発明の振幅変調方式は
、第１図に示すように、被変調器３の出力信号を検波す
る手段と、該検波手段の検波信号により前記変調信号を
整形する手段とを設けた構成としている。In order to solve the above problems, the amplitude modulation method of the present invention, as shown in FIG. The configuration includes a means to do this.
検波手段は、被変調器の振幅変調波形を検波し、被変調
器３で発生した歪んだ変調信号（第３図りのＤＩ）を取
り出す。The detection means detects the amplitude modulation waveform of the modulator 3 and extracts a distorted modulation signal (DI in the third diagram) generated by the modulator 3.
整形手段は、検波手段で取り出された歪んだ検波波形を
変調器の出力波形より減算した誤差信号を作成し、この
誤差信号を被変調器に負帰還することによって第３図Ｄ
２の補正信号を形成して被変調器３に入力し、変調器３
の変調歪（直線性子）を補償して出力振幅変調歪を少な
くしている。The shaping means creates an error signal by subtracting the distorted detected waveform extracted by the detection means from the output waveform of the modulator, and feeds this error signal back to the modulated device as shown in FIG. 3D.
2 is formed and inputted to the modulated device 3, and the modulator 3
The output amplitude modulation distortion is reduced by compensating for the modulation distortion (linearity factor).
第２図は本発明の一実施例の振幅変調方式のブロック図
、第３図は一実施例の動作説明のための信号波形図であ
る。FIG. 2 is a block diagram of an amplitude modulation method according to an embodiment of the present invention, and FIG. 3 is a signal waveform diagram for explaining the operation of the embodiment.
第２図に示すように、一実施例の振幅変調方式は、オー
ディオ信号を増幅して変調信号とする変ｍ機Ｉと、高周
波増幅器２で増幅された高周波信号を変調器１より出力
される変調信号によって振幅変調する被変調器３と、被
変調器３の出力振幅変調信号を検波する検波手段に歪の
ない直線検波器４と、被変調器の出力信号波形を整形す
る手段に、変調器１の出力信号から直線検波器４の出力
信号を減算する差動アンプ５−１と被変調器３に負帰還
する回路から成る減算回路５で構成されている。As shown in FIG. 2, the amplitude modulation method of one embodiment includes a modulator I that amplifies an audio signal to produce a modulation signal, and a high frequency signal that has been amplified by a high frequency amplifier 2 and is output from a modulator 1. A modulator 3 that performs amplitude modulation with a modulation signal, a linear detector 4 that has no distortion in its detection means that detects the output amplitude modulation signal of the modulator 3, and a modulator that shapes the output signal waveform of the modulator 3. The subtraction circuit 5 includes a differential amplifier 5-1 that subtracts the output signal of the linear detector 4 from the output signal of the detector 1, and a subtraction circuit 5 that provides negative feedback to the modulated device 3.
その動作を第３図の信号波形図を参照して説明する。The operation will be explained with reference to the signal waveform diagram in FIG.
変調器１は入力される低周波の正弦波信号Ａを増幅して
変調信号Ｂを作成し、減算回路５の差動アンプ５−１の
一方の入力端に入力する。The modulator 1 amplifies the input low frequency sine wave signal A to create a modulated signal B, and inputs the modulated signal B to one input terminal of the differential amplifier 5 - 1 of the subtraction circuit 5 .
一方、直線検波器４は、被変調器３の出力振幅変調信号
（第３図Ｅの点線で示すＥ１信号）を検波し、第３図Ｄ
（７）ＤＩ に示すような、変調歪をもった変調信号を
検出し、差動アンプ５−１の他の一方の入力端に出力す
る。On the other hand, the linear detector 4 detects the output amplitude modulation signal of the modulated device 3 (the E1 signal shown by the dotted line in FIG. 3E), and
(7) Detect a modulated signal with modulation distortion as shown in DI and output it to the other input terminal of the differential amplifier 5-1.
差動アンプ５−１は、直線検波器４の出力信号と変調器
１の出力信号との誤差信号を検出し、補正信号（第３図
りのＤ２）となって被変調器３に入力する。The differential amplifier 5-1 detects an error signal between the output signal of the linear detector 4 and the output signal of the modulator 1, and inputs it to the modulated device 3 as a correction signal (D2 in the third diagram).
このように、被変調器３の振幅歪骨を補正信号で補償す
ることによって第３図Ｅの実線で示す直線歪の少ない振
幅変調波形を得ている。In this way, by compensating for the amplitude distortion of the modulated device 3 with the correction signal, an amplitude modulation waveform with less linear distortion as shown by the solid line in FIG. 3E is obtained.
なお、上記は被変調器の直線歪の補償について述べたが
、オーディオ信号を増幅する変調器において歪が発生し
ても被変調器の直線歪とともに補償され、送信機全体の
歪を少なくすることができる。Note that the above mentioned compensation for the linear distortion of the modulated device, but even if distortion occurs in the modulator that amplifies the audio signal, it is compensated for along with the linear distortion of the modulated device, reducing the distortion of the entire transmitter. Can be done.
以上説明したように本発明によれば、送信機の振幅変調
歪を少なくすることが可能となる。As explained above, according to the present invention, it is possible to reduce amplitude modulation distortion of the transmitter.
第１図は本発明の振幅変調方式の原理ブロック図、
第２図は一実施例の振幅変調方式のブロック図、第３図
は本発明の信号波形図、
第４図は従来の振幅変調方式のブロック図、第５図は従
来の振幅変調方式の信号波形図、第６図は被変調器の変
調特性図である。
図において、１は変調器、２は高周波増幅器、３は被変
調器、４ば直線検波器、５は減算回路、５−１は差動ア
ンプを示している。
」ミｉｏ月のシ艮゛７’６ｔ＃司方Ｅｑｉ１里７”ロソ
７ｍ第１図
一ダζじ欽省イク九＆惰−蜜ｆｆ７♂ｑａ７ 口・ン
７ｍ第２図
２ト完ｇ月内４百号〃芝形Ｇう
第３図
省〔Ｆ妃ル・Ｍ！ 、賢訓方へり７“°口・・７ｍ第４
図
赴り篠Ｔ駐変調方式の信号３ｇの
第５図
第６図Fig. 1 is a principle block diagram of the amplitude modulation method of the present invention, Fig. 2 is a block diagram of an embodiment of the amplitude modulation method, Fig. 3 is a signal waveform diagram of the present invention, and Fig. 4 is a conventional amplitude modulation method. FIG. 5 is a signal waveform diagram of a conventional amplitude modulation method, and FIG. 6 is a modulation characteristic diagram of a modulated device. In the figure, 1 is a modulator, 2 is a high frequency amplifier, 3 is a modulated device, 4 is a linear detector, 5 is a subtraction circuit, and 5-1 is a differential amplifier. "Miio moon's song 7'6t No. 400〃Shiba-gata G U Fig. 3 Ministry〃F Queen Le M!, Kenken direction 7"°mouth...7m No. 4
Figure 5 and 6 of the signal 3g of Shino T parking modulation system.
Claims (1)
成し、該変調信号によって高周波信号に振幅変調する被
変調器（３）の振幅変調方式において、 前記被変調器の出力信号を検波する手段と、該検波手段
の検波信号により前記変調信号を整形する手段とを設け
て成ることを特徴とする振幅変調方式。[Scope of Claims] An amplitude modulation method of a modulator (3) in which an audio signal is amplified by a modulator (1) to create a modulation signal, and the modulation signal is used to modulate the amplitude of a high-frequency signal, comprising: 1. An amplitude modulation system comprising: means for detecting an output signal of the detector; and means for shaping the modulated signal using the detected signal of the detecting means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11949986A JPS62274905A (en) | 1986-05-23 | 1986-05-23 | Amplitude modulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11949986A JPS62274905A (en) | 1986-05-23 | 1986-05-23 | Amplitude modulation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62274905A true JPS62274905A (en) | 1987-11-28 |
Family
ID=14762777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11949986A Pending JPS62274905A (en) | 1986-05-23 | 1986-05-23 | Amplitude modulation system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62274905A (en) |
-
1986
- 1986-05-23 JP JP11949986A patent/JPS62274905A/en active Pending
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