JPH0540571Y2 - - Google Patents

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Publication number
JPH0540571Y2
JPH0540571Y2 JP1989021325U JP2132589U JPH0540571Y2 JP H0540571 Y2 JPH0540571 Y2 JP H0540571Y2 JP 1989021325 U JP1989021325 U JP 1989021325U JP 2132589 U JP2132589 U JP 2132589U JP H0540571 Y2 JPH0540571 Y2 JP H0540571Y2
Authority
JP
Japan
Prior art keywords
modulation
variable resistor
control signal
switch
band
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.)
Expired - Lifetime
Application number
JP1989021325U
Other languages
Japanese (ja)
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JPH02113421U (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Priority to JP1989021325U priority Critical patent/JPH0540571Y2/ja
Publication of JPH02113421U publication Critical patent/JPH02113421U/ja
Application granted granted Critical
Publication of JPH0540571Y2 publication Critical patent/JPH0540571Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Amplitude Modulation (AREA)

Description

【考案の詳細な説明】 (産業上の利用分野) この考案は送信機の変調補正回路に関し、さら
に詳言すれば広帯域送信機において帯域内で変調
感度が大きく異なる場合に好適な変調補正回路に
関する。
[Detailed description of the invention] (Field of industrial application) This invention relates to a modulation correction circuit for a transmitter, and more specifically, to a modulation correction circuit suitable for wideband transmitters where modulation sensitivity varies greatly within the band. .

(従来技術) 送信機におけるFM変調は第3図に示す如く、
マイクロホン1からの出力を増幅器2で増幅し、
増幅器2からの出力をポテンシヨメータ接続の可
変抵抗器3を介して取り出し電圧制御発振器4の
可変容量ダイオードに印加して、FM変調するこ
とが行なわれている。
(Prior art) FM modulation in the transmitter is as shown in Figure 3.
The output from microphone 1 is amplified by amplifier 2,
The output from the amplifier 2 is extracted via a variable resistor 3 connected to a potentiometer and applied to a variable capacitance diode of a voltage controlled oscillator 4 for FM modulation.

(考案が解決しようとする課題) 上記した変調を行なう場合、変調回路が広帯域
の場合、電圧制御発振器内の可変容量ダイオード
の容量が帯域内で大きく異なるために変調感度が
帯域の上限近傍および下限近傍で大きく異なる問
題点があつた。
(Problem to be solved by the invention) When performing the above modulation, if the modulation circuit has a wide band, the capacitance of the variable capacitance diode in the voltage controlled oscillator varies greatly within the band, so the modulation sensitivity is near the upper limit and lower limit of the band. There were very different problems in the vicinity.

また、第3図に示した如き場合は、可変抵抗器
3で変調信号レベルを設定し、これを電圧制御発
振器4の可変容量ダイオードに加えて変調をかけ
ている。ここで変調信号レベルは可変抵抗器3だ
けで調整しているため、広帯域では変調感度が帯
域内で大きく変化する問題点があつた。
In the case shown in FIG. 3, the modulation signal level is set by the variable resistor 3, and this is added to the variable capacitance diode of the voltage controlled oscillator 4 to effect modulation. Here, since the modulation signal level is adjusted only by the variable resistor 3, there is a problem that the modulation sensitivity varies greatly within the band in a wide band.

(課題を解決するための手段) この考案の変調補正回路は、変調感度にともな
つて制御信号を出力する制御信号発生手段と、制
御信号発生手段からの制御信号によつて駆動され
るスイツチ手段と、スイツチ手段に直列接続され
て変調信号レベルを選択的に切替える抵抗手段と
を備えたことを特徴とするものである。
(Means for Solving the Problems) The modulation correction circuit of this invention includes a control signal generating means that outputs a control signal in accordance with the modulation sensitivity, and a switch means driven by the control signal from the control signal generating means. and resistor means connected in series to the switch means for selectively switching the modulation signal level.

(作用) 上記の如く構成したこの考案において抵抗手段
はスイツチ手段と直列接続されており、制御信号
発生手段からの制御信号によつてスイツチ手段が
変調感度にともなつて駆動される。したがつて変
調信号レベルは変調感度がほぼ一定となるように
制御される。
(Function) In this invention constructed as described above, the resistor means is connected in series with the switch means, and the switch means is driven in accordance with the modulation sensitivity by a control signal from the control signal generating means. Therefore, the modulation signal level is controlled so that the modulation sensitivity is approximately constant.

(実施例) 以下、この考案を実施例により説明する。(Example) This invention will be explained below using examples.

第1図はこの考案の一実施例の構成を示すブロ
ツク図である。
FIG. 1 is a block diagram showing the structure of an embodiment of this invention.

マイクロホン1からの出力信号は増幅器2に供
給し、増幅する。増幅器2の出力は変調信号レベ
ルを設定する可変抵抗器3に印加し、可変抵抗器
3によりレベル設定された変調信号は変調信号レ
ベルを切換える負荷抵抗5と負荷抵抗5をオン・
オフするスイツチ6との直列回路に印加すると共
に、変調をかけるための電圧制御発振器4の可変
容量ダイオードに印加する。制御信号発生器7か
らの出力によつてスイツチ6を切替える。
The output signal from microphone 1 is supplied to amplifier 2 and amplified. The output of the amplifier 2 is applied to a variable resistor 3 that sets the modulation signal level, and the modulation signal whose level is set by the variable resistor 3 turns on and off a load resistor 5 that switches the modulation signal level.
It is applied to the series circuit with the switch 6 to be turned off, and also to the variable capacitance diode of the voltage controlled oscillator 4 for applying modulation. The switch 6 is switched by the output from the control signal generator 7.

送信機の帯域を上側部分、下側部分に分けると
上側部分では電圧制御発振器4の可変容量ダイオ
ードの容量が小さくなるため、変調感度は良く、
下側部分では逆に変調感度は悪くなる。
When the transmitter band is divided into an upper part and a lower part, the capacitance of the variable capacitance diode of the voltage controlled oscillator 4 becomes smaller in the upper part, so the modulation sensitivity is good.
On the contrary, the modulation sensitivity becomes worse in the lower part.

しかるに制御信号発生器7からの出力によつ
て、送信機の帯域の上側部分ではスイツチ6はオ
ン状態に制御される。したがつて可変抵抗器3の
一部に負荷抵抗5が並列に入る。この結果、可変
抵抗器3の摺動子位置に変化が無いときにおいて
も、変調信号レベル設定のための抵抗値は小さく
なつて、変調信号レベルが小さくなる。したがつ
て電圧制御発振器4の可変容量ダイオードに印加
される電圧は低下させられた状態になる。
However, the output from the control signal generator 7 causes the switch 6 to be turned on in the upper part of the transmitter band. Therefore, a load resistor 5 is connected in parallel to a part of the variable resistor 3. As a result, even when there is no change in the position of the slider of the variable resistor 3, the resistance value for setting the modulation signal level decreases, and the modulation signal level decreases. Therefore, the voltage applied to the variable capacitance diode of the voltage controlled oscillator 4 is reduced.

また、送信機の帯域の下側部分では制御信号発
生器7からの出力によつて、スイツチ6はオフ状
態に制御される。したがつて可変抵抗器3の一部
に接続されていた負荷抵抗5は切り離された状態
になる。この結果、可変抵抗器3のみとなり、相
対的に抵抗値が大きくなり、変調信号レベルが大
きくなつて、電圧制御発振器4の可変容量ダイオ
ードに印加される電圧は増加させられた状態にな
る。
Further, in the lower part of the transmitter band, the switch 6 is controlled to be in the OFF state by the output from the control signal generator 7. Therefore, the load resistor 5 that was connected to a part of the variable resistor 3 becomes disconnected. As a result, only the variable resistor 3 is left, its resistance value becomes relatively large, the modulation signal level becomes large, and the voltage applied to the variable capacitance diode of the voltage controlled oscillator 4 is increased.

このために、変調感度はほぼ同一となる。 For this reason, the modulation sensitivities are almost the same.

なお、スイツチ6はトランジスタ、FET等で
構成できる。
Note that the switch 6 can be composed of a transistor, FET, or the like.

また、上記した一実施例においては負荷抵抗5
が1個の場合を例示したが、負荷抵抗を複数個用
いて、可変抵抗器3の摺動子に複数個の負荷抵抗
とスイツチとの直列回路を接続してもよい。ま
た、負荷抵抗5とスイツチ6との直列回路を可変
抵抗器3に直列接続してもよい。これらの場合、
スイツチを制御信号によりオン・オフを制御する
ことは勿論である。
In addition, in the above-mentioned embodiment, the load resistance 5
Although one load resistor is shown as an example, a series circuit of a plurality of load resistors and a switch may be connected to the slider of the variable resistor 3 by using a plurality of load resistors. Further, a series circuit of the load resistor 5 and the switch 6 may be connected in series to the variable resistor 3. In these cases,
Of course, the switch can be turned on and off using a control signal.

つぎにこの考案の一実施例の変形例について説
明する。
Next, a modification of one embodiment of this invention will be described.

第2図はこの考案の一実施例の変形例の構成を
示すブロツク図である。
FIG. 2 is a block diagram showing the structure of a modification of one embodiment of this invention.

本変形例では、増幅器2の出力を可変抵抗器3
とスイツチ61との直列回路に印加し、可変抵抗
器31からの出力電圧を可変抵抗器32とスイツチ
2との直列回路に印加し、以下同様に接続し、
可変抵抗器3oの出力電圧を変調信号レベル設定
出力とする。
In this modification, the output of the amplifier 2 is connected to the variable resistor 3.
1 and switch 6 1 , and the output voltage from variable resistor 3 1 is applied to the series circuit of variable resistor 3 2 and switch 6 2 , and the following connections are made in the same manner.
The output voltage of the variable resistor 3o is used as the modulation signal level setting output.

したがつて、送信機の帯域の上限の場合はスイ
ツチ61〜6oがオン状態に制御される。そこで可
変抵抗器31の一部に可変抵抗32が並列に接続さ
れ、可変抵抗器32の一部に可変抵抗器32が並列
に接続され、同様に可変抵抗器3oまでが接続さ
れていく。したがつて変調信号レベルは低く設定
される。
Therefore, when the transmitter band is at the upper limit, the switches 6 1 to 6 o are controlled to be in the on state. Therefore, variable resistor 32 is connected in parallel to a part of variable resistor 31 , variable resistor 32 is connected in parallel to a part of variable resistor 32 , and similarly up to variable resistor 3o is connected. It will be done. Therefore, the modulation signal level is set low.

また、送信機の帯域の下限の場合はスイツチ6
〜6oがオフ状態に制御される。したがつて可変
抵抗器31の摺動子が可変抵抗器32の一端に接続
され、可変抵抗器32の摺動子に可変抵抗器33
一端が接続される。以下、同様に接続される。し
たがつて変調信号レベルの設定のための抵抗値は
帯域の上側部分の場合に比較して大きい。この結
果、変調信号レベルは高く設定される。
Also, if the transmitter's band is at the lower limit, switch 6
1 to 6 o are controlled to be in the off state. Therefore, the slider of variable resistor 3 1 is connected to one end of variable resistor 3 2 , and the slider of variable resistor 3 2 is connected to one end of variable resistor 3 3 . The following connections are made in the same way. Therefore, the resistance value for setting the modulation signal level is larger than in the upper part of the band. As a result, the modulation signal level is set high.

さらにまた、帯域の上、下限間においては変調
感度が適正となるようなスイツチ61、……、6o
の組合せでオン・オフされる。
Furthermore, switches 6 1 , . . . , 6 o are provided so that the modulation sensitivity is appropriate between the upper and lower limits of the band.
It is turned on and off by a combination of

ここで制御信号発生器7は、周波数情報に対応
してオンさせるスイツチ61、……、6oの制御デ
ータを予めテーブルデータとして記憶した記憶装
置を内蔵しており、たとえばロータリーエンコー
ダ等により設定された周波数情報が入力されて、
入力された周波数情報に応じてテーブルルツクア
ツプし、該当する制御データが記憶装置から読み
出され、読み出された制御データにともなう所定
のスイツチをオン状態に制御する。したがつて、
上記した如く、帯域の上、下限間において変調感
度が適正となるように制御される。また、第1図
に示した一実施例の場合は、制御信号発生器7は
入力された周波数情報が帯域の上側部分である
か、下側部分であるかを判別してスイツチ6をオ
ン・オフ状態に制御するように構成しておけばよ
い。
Here, the control signal generator 7 has a built-in storage device in which control data for the switches 6 1 , . . . , 6 o to be turned on in accordance with frequency information is stored in advance as table data. The frequency information is entered and
A table is looked up in accordance with the input frequency information, the corresponding control data is read from the storage device, and a predetermined switch is controlled to be on according to the read control data. Therefore,
As described above, the modulation sensitivity is controlled to be appropriate between the upper and lower limits of the band. In the case of the embodiment shown in FIG. 1, the control signal generator 7 determines whether the input frequency information is in the upper part or the lower part of the band and turns on the switch 6. What is necessary is just to configure it so that it is controlled to be in the off state.

(考案の効果) 以上説明した如くこの考案によれば、変調信号
レベルを切替え得るために、帯域内の変調感度の
差が小さくなる効果がある。
(Effects of the invention) As explained above, according to this invention, since the modulation signal level can be switched, the difference in modulation sensitivity within the band is reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの考案の一実施例の構成を示すブロ
ツク図。第2図はこの考案の一実施例の変形例の
構成を示すブロツク図。第3図は従来例の構成を
示すブロツク図。 1……マイクロホン、3,31〜3o……可変抵
抗器、4……変調をかけるための電圧制御発振
器、5……負荷抵抗、6,61〜6o……スイツ
チ、7……制御信号発生器。
FIG. 1 is a block diagram showing the configuration of an embodiment of this invention. FIG. 2 is a block diagram showing the configuration of a modification of one embodiment of this invention. FIG. 3 is a block diagram showing the configuration of a conventional example. 1...Microphone, 3,3 1 to 3o ...Variable resistor, 4...Voltage controlled oscillator for applying modulation, 5...Load resistance, 6,6 1 to 6o ...Switch, 7... Control signal generator.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 変調感度にともなつて制御信号を出力する制御
信号発生手段と、制御信号発生手段からの制御信
号によつて駆動されるスイツチ手段と、スイツチ
手段に直列接続されて変調信号レベルを選択的に
切替える抵抗手段とを備えたことを特徴とする変
調補正回路。
control signal generation means for outputting a control signal in accordance with modulation sensitivity; switch means driven by the control signal from the control signal generation means; and switch means connected in series with the switch means for selectively switching the modulation signal level. A modulation correction circuit comprising a resistance means.
JP1989021325U 1989-02-28 1989-02-28 Expired - Lifetime JPH0540571Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1989021325U JPH0540571Y2 (en) 1989-02-28 1989-02-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1989021325U JPH0540571Y2 (en) 1989-02-28 1989-02-28

Publications (2)

Publication Number Publication Date
JPH02113421U JPH02113421U (en) 1990-09-11
JPH0540571Y2 true JPH0540571Y2 (en) 1993-10-14

Family

ID=31238465

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1989021325U Expired - Lifetime JPH0540571Y2 (en) 1989-02-28 1989-02-28

Country Status (1)

Country Link
JP (1) JPH0540571Y2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61161006A (en) * 1985-01-08 1986-07-21 Nec Corp Modulation circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5883813U (en) * 1981-11-30 1983-06-07 日本電気ホームエレクトロニクス株式会社 Variable capacitance modulation circuit
JPS6383875U (en) * 1986-11-20 1988-06-01

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61161006A (en) * 1985-01-08 1986-07-21 Nec Corp Modulation circuit

Also Published As

Publication number Publication date
JPH02113421U (en) 1990-09-11

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