JPS60177733A - Am receiver - Google Patents
Am receiverInfo
- Publication number
- JPS60177733A JPS60177733A JP3236784A JP3236784A JPS60177733A JP S60177733 A JPS60177733 A JP S60177733A JP 3236784 A JP3236784 A JP 3236784A JP 3236784 A JP3236784 A JP 3236784A JP S60177733 A JPS60177733 A JP S60177733A
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- Prior art keywords
- circuit
- current
- detecting
- supplied
- output
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Abstract
Description
【発明の詳細な説明】 〔技術分野〕 本発明はＡＭ受信機に関する。[Detailed description of the invention] 〔Technical field〕 The present invention relates to an AM receiver.
ＡＭ受信機においては、受信中の電波の電界強度を電界
強度計で指示するように構成したものがある。Some AM receivers are configured to indicate the field strength of radio waves being received using a field strength meter.
本願発明に先立ち、本発明者等は前記ＡＭ受信機に関し
、いろいろと技術的検討を行ったが、その結果、以下に
述べるような問題点があることがわかった。Prior to the invention of the present application, the present inventors conducted various technical studies regarding the AM receiver, and as a result, it was found that there were problems as described below.
すなわち、ＡＭ波をピーク検波回路に供給し、ピーク検
波出力により電界強度計を振らせているが、この回路構
成ではＡＭ波の変調度によって検波出力が変化するため
、電界強度は同じでも変調度によって電界強度計のメー
ターのふれが異なり正確な電界強度指示を行ない得ない
ことがわかった。In other words, the AM wave is supplied to the peak detection circuit, and the peak detection output causes the field strength meter to swing. However, with this circuit configuration, the detection output changes depending on the modulation degree of the AM wave, so even if the electric field strength is the same, the modulation degree It was found that the electric field strength meter fluctuated differently depending on the method, and it was not possible to give an accurate indication of the electric field strength.
本発明の目的は、前述の問題点を是正し、受信電波の変
調度の如何にかかわらず、正確な電界強度の指示を行な
い得るＡＭ受信機を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide an AM receiver capable of correcting the above-mentioned problems and accurately indicating electric field strength regardless of the degree of modulation of received radio waves.
本発明の前記ならびにその他の目的と新規な特徴は、本
明細書の記述および添付図面から明らかになるであろう
。The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.
本願において開示される発明の概要を簡単に述べれば、
下記のとおりである。A brief summary of the invention disclosed in this application is as follows:
It is as follows.
すなわち、ピーク検波回路６の検波出力とオーディオ検
波回路７の検波出力を、トランジスタＱ、の電流径路に
対し並列に設けられたトランジスタＱ６により引き算し
、引き算された検波出力電流Ｉ８によって電界強度計を
駆動し、ＡＭ波の変調度に影響されない、電界強度検出
を可能にする、という本発明の目的を達成するものであ
る。That is, the detection output of the peak detection circuit 6 and the detection output of the audio detection circuit 7 are subtracted by a transistor Q6 provided in parallel to the current path of the transistor Q, and a field strength meter is calculated by the subtracted detection output current I8. The object of the present invention is to enable electric field strength detection that is not affected by the modulation degree of AM waves.
本発明を適用したＡＭ受信機の一実施例を第１図〜第３
図を参照して説明する。なお、第１図に示すＡＭ受信機
は、特に図示せずとも、半導体集積回路化されているも
のきする。そして、゛本発明を適用したＡＭ受信機では
、ピーク検波出力とオーディオ検波出力との差の出力信
号により、電界強度針を振らせるように構成されている
。An embodiment of an AM receiver to which the present invention is applied is shown in FIGS.
This will be explained with reference to the figures. Note that the AM receiver shown in FIG. 1 is implemented as a semiconductor integrated circuit, although it is not particularly shown. The AM receiver to which the present invention is applied is configured to cause the field strength needle to oscillate based on the output signal of the difference between the peak detection output and the audio detection output.
受信アンテナ１．高周波増幅回路２．混合回路３、局部
発振回路４．中間周波増幅回路５の回路動作については
、当業者間において既に知られていることであるから、
その説明を省略する。Receiving antenna 1. High frequency amplifier circuit 2. Mixing circuit 3, local oscillation circuit 4. Since the circuit operation of the intermediate frequency amplification circuit 5 is already known among those skilled in the art,
The explanation will be omitted.
中間周波回路５の出力信号■は互いに逆位相であり、そ
の電圧レベル及び周波数成分は、？’ ＝ Ｖ （１＋
ｍｃｏｓｊ７ｔ ） Ｃｏｓωｏｔ ＋・＋＋＋ ＋
＋・−［ｔｌで得られる。前記（１）式において■は搬
送波の電圧しづル、Ｃｏｓωｏｔは搬送波の周波数成分
、ｍは変調度、（：ｏｓｊ）ｔはＡ、Ｍ成分を示す。The output signals (■) of the intermediate frequency circuit 5 have opposite phases to each other, and their voltage levels and frequency components are ? ' = V (1+
mcosj7t ) Cosωot +・+++ +
+・−[tl. In the above equation (1), ■ represents the voltage distribution of the carrier wave, Cosωot represents the frequency component of the carrier wave, m represents the degree of modulation, and (:osj)t represents the A and M components.
搬送波成分のみでＡＭ波による変調が行われないとき、
出力信号Ｖの波形は第２図（Ａ）に示す−如くであり、
出力信号Ｖは、
１−ｖｌＩＣｏｓωｏｔ・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・（２）で得られ
る。また、変調度５０％（ｍ＝０．５）のとき、出力信
号■の波形は第２図（Ｂ）に示す如くであり、出力信号
Ｖは、
ν＝Ｖ ・（１＋ ０．５ Ｃｏ５ｊ７ｔ） Ｃｏｓω
ｏｔ ・・・・・（３１で得られる。また変調波１００
％（ｍ＝１）のとき、出力信号Ｖの波形は第２図（Ｃ）
に示す如くであり、出力信号■は、
ｖ −Ｖ （１＋ ＣｏｓΩｔ ） ＣｏｓωＯ１・・
・・・・・・・・・・・・・（４）で得られる。When only the carrier wave component is modulated by the AM wave,
The waveform of the output signal V is as shown in FIG. 2(A),
The output signal V is 1-vlICosωot・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・It is obtained by (2). Furthermore, when the modulation degree is 50% (m=0.5), the waveform of the output signal ■ is as shown in Fig. 2 (B), and the output signal V is as follows: ν=V ・(1+ 0.5 Co5j7t) Cosω
ot...(obtained by 31.Modulated wave 100
% (m=1), the waveform of the output signal V is shown in Figure 2 (C).
The output signal ■ is as shown in , and the output signal ■ is v −V (1+ CosΩt ) CosωO1...
・・・・・・・・・・・・・・・It is obtained by (4).
前記（２）〜（４）式に示す如き出力信号Ｖは、ピーク
検波回路６とオーディオ検波回路７とに供給される。オ
ーディオ検波回路７は、検波用ダイオードＤ、と抵抗Ｒ
１、コンデンサＣ０からなる時定数回路とにより構成さ
れ、前記時定数回路は搬送波成分を除去する。コンデン
サｃ２は直流阻止用であり、抵抗Ｒ２、基準電圧■ＲＥ
ＦＩは直流分を決定するために設けられている。そして
、Ａ点に表われるオーディオ検波ｖａｆは、
” ” ａｍＶＣｏｓＱｔ ＋ ■ＲＥＦＩ ・・＋・
＋ ＋＋ ・す・−（５１で得られる。前記（５）にお
けるａはオーディオ検波回路７の検波効率を示している
。ここで、オーディオ検波出力■ａｆを前記した変調度
の場合についてめると、前記（２）に対応する場合は、
ｖａｆ−■Ｒオ□ ・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・［６１となる。また、前
記（３４式に対応する場合は、ｖａｆ ＝ ａｅｖ・０
．５ Ｃｏ５Ｑｔ ＋ ＶＢ、１１ −−−−− ｔ７
１となる。また前記＋４１式に対応する場合は、ｖａｆ
−ａ・■・Ｃｏ５Ｑｔ ＋ ＶＲＩＣＦ□・・・・・・
・叩・・・・・−・・・（８）となる。前記オーディオ
出力ｖａｆは、オーディオアンプ（図示せず）に供給さ
れると同時に、ライン！、を介して可変抵抗器鳳□の一
端に供給される。The output signal V shown in equations (2) to (4) above is supplied to the peak detection circuit 6 and the audio detection circuit 7. The audio detection circuit 7 includes a detection diode D and a resistor R.
1. A time constant circuit consisting of a capacitor C0, and the time constant circuit removes a carrier wave component. Capacitor c2 is for DC blocking, resistor R2, reference voltage RE
FI is provided to determine the DC component. Then, the audio detection vaf appearing at point A is “” amVCosQt + ■REFI ・・+・
+ ++ ・S・− (obtained from 51. a in the above (5) indicates the detection efficiency of the audio detection circuit 7. Here, when considering the audio detection output ■ af in the case of the above modulation degree, , if it corresponds to (2) above,
vaf-■R□・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・[It will be 61. In addition, when corresponding to the above (34 formula), vaf = aev・0
．． 5 Co5Qt + VB, 11 ---- t7
It becomes 1. Also, if it corresponds to the above formula +41, vaf
-a・■・Co5Qt + VRICF□・・・・・・
・Hit...---(8). The audio output vaf is simultaneously supplied to an audio amplifier (not shown) and the line! , to one end of the variable resistor □.
一方、前記出力信号Ｖが供給されるピーク検波口ｊｌｌ
！６は以下に述べる如く動作する。On the other hand, a peak detection port jll to which the output signal V is supplied
! 6 operates as described below.
コンデンサＣ１１ｙ ＣＩｔは直流阻止用である。トラ
ンジスタＱ、、Ｑ、のバイアス電圧は基準電圧■Ｒ１，
，Ｆ２によって規定され、トランジスタ。３ 。Capacitor C11y CIt is for direct current blocking. The bias voltage of transistors Q, , Q, is the reference voltage ■R1,
, F2, transistor. 3.
Ｑ４にそれぞれ一定のベース電流を供給する。トランジ
スタＱ８ 、Ｑ４の各ベースには、出力信号Ｖの交流分
が供給されるので、トランジスタ。８ 。A constant base current is supplied to each Q4. The alternating current portion of the output signal V is supplied to the bases of the transistors Q8 and Q4, so they are transistors. 8.
Ｑ４が交互にオン状態に動作する。従って、＋ｖｏ。Q4 alternately operates in the on state. Therefore, +vo.
電源ラインから、ダイオードＤ２ 、トランジスタＱｓ
、又はＱ、の何れか一方、抵抗Ｒ８を介して電流が流れ
、その電流量に対応して、トランジスタＱ、を流れる電
流’ｄａｔ が制御される。From the power supply line, diode D2, transistor Qs
, or Q, a current flows through resistor R8, and the current 'dat flowing through transistor Q is controlled in accordance with the amount of current.
電流’ｄａｔの直流成分ｉ。０はキャリア信号Ｖ−ＶＣ
ｏｓωｏｔの振幅■に比例し、変調度が０％のとき第３
図（Ａ）に示すような波形となり、１ｄｅｔ′、ｂ−ｖ
−ｃｏｓωｏｔ＋ＩＤＣ−ＩＤ。十よりｃ（９）となる
。DC component i of current 'dat. 0 is carrier signal V-VC
It is proportional to the amplitude of osωot, and when the modulation degree is 0%, the third
The waveform is as shown in figure (A), 1det', b-v
-cosωot+IDC-ID. From 10, it becomes c(9).
■ＤＣは、バイアス電圧ｖｒｅｆ２によって流れる直流
電流である。なお、前記（９）式におゆるｂはピーク検
波回路６の検波効率である。また、変調度が５０％のと
き第３図（Ｂ）に示す如き波形となり、’ｄｅｔ ’＝
、ｂ会Ｖ・ｃ＋ ＋ ０．５ＣｏｓＱｔ） Ｃｏｓωｏ
ｔ＋ＩＤ。(2) DC is a direct current flowing due to the bias voltage vref2. Note that b in the above equation (9) is the detection efficiency of the peak detection circuit 6. Also, when the modulation degree is 50%, the waveform becomes as shown in Figure 3 (B), and 'det' =
, b meeting V・c+ + 0.5CosQt) Cosωo
t+ID.
’−ｉ ＋ ｂ ・Ｖ・０．５ Ｃｏ５Ｊ７ｔ ＋ Ｉ
ＤＣ−［１０１Ｃ
で得られる。更に、変調度が１００％のとき第３図（Ｃ
）に示す如き波形となり、
Ｉｄｅｔ ； ｂ 拳■・（１＋ＣｏｓΩｔ ） Ｃｏ
ｓωｏｔ ＋ ＩＤＣ５、ＩＤＣＩｂ・■・Ｃｏ５Ｑｔ
＋■Ｄｏ・・・・・・・−ａυで得られる。'-i + b ・V・0.5 Co5J7t + I
Obtained with DC-[101C. Furthermore, when the modulation depth is 100%, Fig. 3 (C
) The waveform becomes as shown in Idet ; b fist■・(1+CosΩt ) Co
sωot + IDC5, IDCIb・■・Co5Qt
+■Do・・・・・・−aυ is obtained.
ところで、トランジスタＱ、のフレフタ電流ＩＱ７は、
可変抵抗器ＶＲ１を介して供給される前記オーディオ検
波出力ｖａｆに対応するので、’Ｑ７二Ｃ” ｖａ ｒ
となる。なお、両式におけるＣは比例系数である。By the way, the flipter current IQ7 of the transistor Q is
Since it corresponds to the audio detection output vaf supplied via the variable resistor VR1, 'Q72C' var
becomes. Note that C in both equations is a proportional series.
従って、変調度Ｏ％のとき、前記Ｉ Ｑ ７は、ｌ Ｃ
７” Ｃ・■ＲＦ、Ｆ□・・・・・・・・・・・・・・
・・・・ ・・・・α２変調度５０％のとき、前記ム、
７は、
１ｑ７−Ｃ＠ａ・■・ＣｏｓＱｔ ＋ Ｃ−ＶＲＥＦｌ
、、、 、、、 、、、αり変調度１００％のとき、前
記Ｉ Ｑ ７は、ｉ、７＝ Ｃ−ａ−Ｖ −ＣｏｓＱｔ
＋Ｃ＊ＶＲ，Ｆ１− □＝ ・−αるでめられる。そ
して、［９１、（ｌα、０υ式の検波効率すと１２ 、
ｕｎｉ 、αａ弐におけルａ 、 Ｃトノ関係ヲｂ
＝Ｃ−ａとなるように設定すれば抵抗Ｒ６を介して電界
強度計１１に流れる電流工 は、ＩＳ ”” ｄｅｔ−
ｉ、７でめられる。Therefore, when the modulation degree is 0%, the I Q 7 is l C
7” C・■RF, F□・・・・・・・・・・・・・
......When the α2 modulation degree is 50%, the above m,
7 is 1q7-C@a・■・CosQt + C-VREFl
, , , , , , , , When the modulation degree of α is 100%, the above I Q 7 is i,7=C-a-V-CosQt
+C*VR, F1- □= ・-α can be determined. Then, the detection efficiency of the formula [91, (lα, 0υ) is 12,
uni, αa2, rua, C tono relationship wob
=Ca, the current flowing to the electric field strength meter 11 via the resistor R6 is IS "" det-
I can be found at 7.
従って、変調度が０％、５０％、１００％の何れであっ
ても、電流工。は、
Ｉｓ ” ＩＤＣＣ・ＶＲＥＦｌ ＋ ＩＤＣ・・・・
・・・・・・・・・・０９となり、変調度にかかわりな
い検波電流’ｄｅｔ が電界強度計１１に供給される。Therefore, regardless of whether the modulation degree is 0%, 50%, or 100%, the electric current works. Is ” IDCC・VREFl + IDC・・・・
. . . 09, and the detection current 'det regardless of the degree of modulation is supplied to the electric field strength meter 11.
すなわち、検波電流■８ は、電流’ＤＣ（搬送波信号
ｖ−■＠ＣｏｓΩｔ７の振幅■）に比例するため、変調
度に影響されなくなる。従って、電界強度計１１は、変
調度にかかわりなく電界強度に対応して駆動される。な
お、コンデンサＣ１３は交流成分を除去するものである
。That is, since the detection current (2)8 is proportional to the current 'DC (the amplitude (2) of the carrier signal v-2@CosΩt7), it is not affected by the degree of modulation. Therefore, the electric field strength meter 11 is driven in accordance with the electric field strength regardless of the degree of modulation. Note that the capacitor C13 is for removing AC components.
又、■ＤＣ二ＣＶｒｅｆ０とすれば、ＩＳ ＝ ’ＤＣ
となる。Also, if ■DC2CVref0, then IS = 'DC
becomes.
（１） ピーク検波回路の検波出力と、オーディオ検波
回路の検波出力との差の電流により電界強度計を駆動す
るようにしたので、電界強度計はＡＭ波の変調度にかか
わりなく振られるようになり、ＡＭ波の正確な電界強度
指示を行う、という効果が得られる。(1) The field strength meter is driven by the current that is the difference between the detection output of the peak detection circuit and the detection output of the audio detection circuit, so the field strength meter swings regardless of the modulation degree of the AM wave. Therefore, the effect of accurately indicating the electric field strength of the AM wave can be obtained.
以上に、本発明者によってなされた発明を実施例にもと
づき具体的に説明したが、本発明は前記実施例に限定さ
れるものではなく、その要旨を逸脱しない範囲で種々変
形可能であることはいうまでもない。Above, the invention made by the present inventor has been specifically explained based on the examples, but the present invention is not limited to the above-mentioned examples, and can be modified in various ways without departing from the gist of the invention. Needless to say.
例えば、６のピーク検波回路は、本図の両波検波ではな
く、片側検波回路としてもよい。For example, the peak detection circuit 6 may be a one-sided detection circuit instead of the double-wave detection shown in the figure.
本発明を適用したＡＭ受信機は、自動車ラジオ、ＡＭ波
を用いた通信機などに利用することができる。An AM receiver to which the present invention is applied can be used in a car radio, a communication device using AM waves, and the like.
第１図は本発明の一実施例を示すＡＭ受信機の要部の回
路図を示し、
第２図（Ａ） （Ｂ） （Ｃ）は前記ＡＭ受信機の回路
動作を示す変調波形図を示し、
第３図（Ａ）（Ｂ）（Ｃ）はピーク検波回路の検波出力
電流の波形図を示す。
６・・・ピーク検波回路、７・・オーディオ検波回路、
１１・電界強度計、Ｑ＋ ＋ Ｃ２＋ Ｑｓ ｒ Ｃ４
ｒＱｇ ＋ Ｑｓ −） ランシスタ、ｖＲＥＦｌ １
■ＲＥＦ２ ”’基準電圧−＋ ＣＩ ｒ Ｃ２＋
ＣＩｌ ＋ ＣＩ２ ＋ ＣＩ３・・・抵抗、１ｄｅｔ
・・・検波出力電流。FIG. 1 shows a circuit diagram of the main parts of an AM receiver showing an embodiment of the present invention, and FIGS. 2 (A), (B), and (C) show modulation waveform diagrams showing the circuit operation of the AM receiver. 3A, 3B, and 3C show waveform diagrams of the detection output current of the peak detection circuit. 6...Peak detection circuit, 7...Audio detection circuit,
11・Field strength meter, Q+ + C2+ Qs r C4
rQg + Qs −) Runsista, vREFl 1
■REF2 ”'Reference voltage-+ CI r C2+
CIl + CI2 + CI3...Resistance, 1det
...Detection output current.
Claims (1)
らオーディオ信号を得るオーディオ検波回路と、前記ピ
ーク検波回路の検波出力と前記オーディオ検波回路の検
波出力との差の出力信号を得る引き算回路とをそれぞれ
具備し、前記差の出力信号を電界強度計に供給してＡＭ
波の変調度にかかわりなく電界強度指示を行なうことを
特徴とするＡＭ受信機。l. A peak detection circuit that detects an AM signal, an audio detection circuit that obtains an audio signal from the AM signal, and a subtraction circuit that obtains an output signal of the difference between the detection output of the peak detection circuit and the detection output of the audio detection circuit. AM
An AM receiver characterized by giving an electric field strength indication regardless of the degree of modulation of waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3236784A JPS60177733A (en) | 1984-02-24 | 1984-02-24 | Am receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3236784A JPS60177733A (en) | 1984-02-24 | 1984-02-24 | Am receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60177733A true JPS60177733A (en) | 1985-09-11 |
Family
ID=12356974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3236784A Pending JPS60177733A (en) | 1984-02-24 | 1984-02-24 | Am receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60177733A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6959578B2 (en) * | 2001-10-12 | 2005-11-01 | Hitachi, Ltd. | Multi-row rolling mills, methods of operating these mills, and rolling equipment using the mills |
-
1984
- 1984-02-24 JP JP3236784A patent/JPS60177733A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6959578B2 (en) * | 2001-10-12 | 2005-11-01 | Hitachi, Ltd. | Multi-row rolling mills, methods of operating these mills, and rolling equipment using the mills |
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