JPS6041331A - radio receiver - Google Patents
radio receiverInfo
- Publication number
- JPS6041331A JPS6041331A JP59142777A JP14277784A JPS6041331A JP S6041331 A JPS6041331 A JP S6041331A JP 59142777 A JP59142777 A JP 59142777A JP 14277784 A JP14277784 A JP 14277784A JP S6041331 A JPS6041331 A JP S6041331A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- detection
- band
- radio receiver
- 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
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Control Of Amplification And Gain Control (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は通常のＦＭ放送と、ＴＶ放送の両方を受信でき
るラジオ受信機に係り、簡単な構成で優れたラジオ受信
機を提供するものでちる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radio receiver capable of receiving both normal FM broadcasts and TV broadcasts, and its purpose is to provide an excellent radio receiver with a simple configuration.
一般にＦＭ放送とＴＶ放送の両方を受信できるように構
成したラジオ受信機は公知である。しかしながらこれら
のラジオ受信機はいずれも検波出力を単に低周波増幅し
てスピーカに印加するように構成しただけのものであり
、ＦＭ放送の受信時とＴＶ放送の受信時とでそれぞれ音
量が異なるという問題があった。Radio receivers configured to be able to receive both FM broadcasts and TV broadcasts are generally known. However, all of these radio receivers are simply configured to amplify the detected output to a low frequency and apply it to the speaker, so the volume is different when receiving FM broadcasts and when receiving TV broadcasts. There was a problem.
本発明は以上のような従来の欠点を除去するものであり
、ＦＭ放送とＴＶ放送ではそれぞれ変調度が異なるとい
うことに着目゛し、それぞれの受信状態に応じて低周波
増幅回路の増幅度を自動的に切換え、いずれの受°信状
態でもほとんど同一の音量が得られるように構成したも
のである。The present invention aims to eliminate the above-mentioned conventional drawbacks, and focuses on the fact that FM broadcasting and TV broadcasting have different modulation degrees, and adjusts the amplification degree of the low frequency amplifier circuit according to the respective reception conditions. The system is configured so that almost the same volume can be obtained in any reception state by automatically switching.
以下、本発明のラジオ受信機について一実施例の図面と
ともに説明する。図において、１はアンテナ、２は高周
波増幅回路、３は局部発振回路、４は周波数混合回路、
５は中間周波増幅回路、６はＦＭ検波回路、７は低周波
増幅回路、８はスピーカ、９は同調操作に連動して受信
電波がＦＭ帯であるか、ＴＶ帯であるかを検出する検出
回路、１ｏは中間周波増幅回路６の出力をＡＭ検波する
ＡＭ検波回路１１と、このＡＭ検波回路１１の出力と検
出回路９の出力とを入力とするアンド回路１２と、アン
ド回路１２の出力を入力とするフィー２チング回路１３
より成る制御回路である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The radio receiver of the present invention will be described below with reference to the drawings of one embodiment. In the figure, 1 is an antenna, 2 is a high frequency amplifier circuit, 3 is a local oscillation circuit, 4 is a frequency mixing circuit,
5 is an intermediate frequency amplification circuit, 6 is an FM detection circuit, 7 is a low frequency amplification circuit, 8 is a speaker, and 9 is a detection device that detects whether the received radio wave is in the FM band or TV band in conjunction with the tuning operation. The circuit 1o includes an AM detection circuit 11 that performs AM detection on the output of the intermediate frequency amplification circuit 6, an AND circuit 12 whose inputs are the output of this AM detection circuit 11 and the output of the detection circuit 9, and the output of the AND circuit 12. Featuring circuit 13 as input
This is a control circuit consisting of:
上記実施例において、アンテナ１で受信された信号は高
周波増幅回路２で増幅され周波数混合回路４で局部発振
回路３の発振出力と混合され、中間周波信号に変換され
る。中間周波信号は中間周波増幅回路５で増幅されＦＭ
検波回路６でＦＭ検波される。そして、ＦＭ検波された
出力は低周波増幅回路７で増幅されスピーカ８に印加さ
れる。In the above embodiment, the signal received by the antenna 1 is amplified by the high frequency amplifier circuit 2, mixed with the oscillation output of the local oscillation circuit 3 by the frequency mixing circuit 4, and converted into an intermediate frequency signal. The intermediate frequency signal is amplified by the intermediate frequency amplification circuit 5 and converted into FM
The detection circuit 6 performs FM detection. Then, the FM detected output is amplified by a low frequency amplifier circuit 7 and applied to a speaker 8.
一方、検出回路９は同調操作に連動して受信信号がＦＭ
信号であるかＴＶ倍信号あるかを判別するように構成さ
れており、たとえば受信信号がＴＶ帯であれば、ハイレ
ベ／１／Ｈの出力が現われ、ＦＭ帯であればローレベ／
１／Ｌの出力が現われるように構成されている。On the other hand, the detection circuit 9 detects that the received signal is FM in conjunction with the tuning operation.
It is configured to determine whether the received signal is a TV signal or a TV double signal. For example, if the received signal is a TV band, a high level/1/H output will appear, and if it is an FM band, a low level/H level output will appear.
It is configured so that an output of 1/L appears.
今、受信信号がＦＭ帯で検出回路９の出力がローレベル
であったとすると、ＡＭ検波回路１１の出力に関係なく
アンド回路１２の出、力がローレベルであるため、スイ
ッチング回路１３が非動作状態にあシ低周波増幅回路７
の増幅度は通常の値を呈すことになる。ところが今受信
信号がＴＶ帯で検出回路９の出力がハイレベルであった
とすると、アンド回路１２の出力１２はＡＭ検波回路１
１の出力に依存することになる。すなわち、非同調状態
では、ＡＭ検波回路１１の出力がローレベルであるため
、アンド回路１２の出力もローレベルであシ低周波増幅
回路７の増幅度は通常の値を呈しているが、同調状態に
なるとＡＭ検波回路１２の出力がハイレベルになるため
アント゛回路１２の出力もハイレベルになシヌイノチン
ク回路１３が動作して低周波増幅回路７の増幅度が非同
調状態のときよりも大きくなる。Now, if the received signal is in the FM band and the output of the detection circuit 9 is low level, the output of the AND circuit 12 is low level regardless of the output of the AM detection circuit 11, so the switching circuit 13 is inactive. Low frequency amplifier circuit 7
The amplification degree of will take on a normal value. However, if the received signal is in the TV band and the output of the detection circuit 9 is high level, the output 12 of the AND circuit 12 is the AM detection circuit 1.
It depends on the output of 1. That is, in the out-of-tuning state, the output of the AM detection circuit 11 is at a low level, so the output of the AND circuit 12 is also at a low level, and the amplification degree of the low-frequency amplifier circuit 7 has a normal value. When this state is reached, the output of the AM detection circuit 12 becomes high level, so the output of the antenna circuit 12 also becomes high level, the sinuinotinck circuit 13 operates, and the amplification degree of the low frequency amplifier circuit 7 becomes larger than in the non-tuned state. .
したがって、上記実施例によればＦＭ受信時もＴＶ受信
時もはｙ同一の音量で受信することができる。Therefore, according to the above embodiment, it is possible to receive FM and TV at the same volume.
以上、実施例より明らかなように本発明のラジオ受信機
によれば、ＴＶ帯の信号を受信したときには自動的にＦ
Ｍ帯の信号を受信したときより低周波増幅回路の増幅度
を一定量大きくすることができ、したがって、いずれの
受信時にもはｙ同一の音量を得ることができるという利
点を有する。As is clear from the above embodiments, according to the radio receiver of the present invention, when a TV band signal is received, the F
This has the advantage that the amplification degree of the low frequency amplifier circuit can be increased by a certain amount compared to when receiving an M band signal, and therefore the same sound volume can be obtained at any time of reception.
そして、実施例のように制御回路を構成した場合にはＴ
Ｖ帯の信号を受信した場合でも非同調状態であれば低周
波増幅回路の増幅度が通常のままであるため非同調時の
局間雑音が少ないという利点を有する。When the control circuit is configured as in the embodiment, T
Even when a V-band signal is received, the amplification degree of the low frequency amplifier circuit remains normal if it is in an out-of-tune state, so there is an advantage that there is less inter-office noise when out of tune.
図は本発明のラジオ受信機における一実施例のブロック
ダイヤグラムである。
１・・・・アンテナ、２・・・・・高周波増幅回路、３
・・・・・・局部発振回路、４・・・・・周波数混合回
路、５・・・・中間周波増幅回路、６・・・・・・ＦＭ
検波回路、７・・・・低周波増幅回路、８・・・・・・
スピーカ、９・・・・・・検出回路、１０・・・・・制
御回路、１１・・・ＡＭ検波回路、１２ ・・ アンド
回路、１３・・・・・・スイッチング回路。The figure is a block diagram of an embodiment of the radio receiver of the present invention. 1...Antenna, 2...High frequency amplification circuit, 3
... Local oscillation circuit, 4 ... Frequency mixing circuit, 5 ... Intermediate frequency amplification circuit, 6 ... FM
Detection circuit, 7...Low frequency amplification circuit, 8...
Speaker, 9...Detection circuit, 10...Control circuit, 11...AM detection circuit, 12...AND circuit, 13...Switching circuit.
Claims (2)
出する検出手段、この検出手段の出力によ多制御される
制御回路とを設け、この制御回路の出力により低周波増
幅回路の増幅度を自動的に切換えるように構成した４ラ
ジオ受信機。(1) A detection means for detecting whether the received radio wave is in the FM band or the TV band, and a control circuit that is controlled by the output of this detection means, and the output of this control circuit is used to generate a low frequency amplification circuit. 4 radio receivers configured to automatically switch the amplification level.
検波回路と、この人Ｍ検波回路の出力と検出手段の出力
とをそれぞれ入口とするアンド回路と、このアンド回路
の出力を人力とするヌイッチング回路とで制御回路を構
成して成る特許請求の範囲第１項記載のラジオ受信機。(2) AM detecting the output of the FM intermediate frequency amplifier circuit
A control circuit is constituted by a detection circuit, an AND circuit whose inputs are the output of the human M detection circuit and the output of the detection means, respectively, and a nuitting circuit whose input is the output of the AND circuit. The radio receiver according to paragraph 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59142777A JPS6041331A (en) | 1984-07-10 | 1984-07-10 | radio receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59142777A JPS6041331A (en) | 1984-07-10 | 1984-07-10 | radio receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6041331A true JPS6041331A (en) | 1985-03-05 |
Family
ID=15323345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59142777A Pending JPS6041331A (en) | 1984-07-10 | 1984-07-10 | radio receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6041331A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4750013A (en) * | 1986-08-15 | 1988-06-07 | Nippon Kogaku K. K. | Automatic focus adjustment camera |
| US4907025A (en) * | 1986-10-27 | 1990-03-06 | Nikon Corporation | Automatic focusing camera |
| EP0748043A3 (en) * | 1995-06-07 | 1998-06-10 | LOEWE OPTA GmbH | Automatic volume control |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5243931U (en) * | 1975-09-18 | 1977-03-29 | ||
| JPS5344907U (en) * | 1976-09-20 | 1978-04-17 | ||
| JPS558057A (en) * | 1978-07-04 | 1980-01-21 | Hitachi Ltd | Semiconductor |
-
1984
- 1984-07-10 JP JP59142777A patent/JPS6041331A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5243931U (en) * | 1975-09-18 | 1977-03-29 | ||
| JPS5344907U (en) * | 1976-09-20 | 1978-04-17 | ||
| JPS558057A (en) * | 1978-07-04 | 1980-01-21 | Hitachi Ltd | Semiconductor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4750013A (en) * | 1986-08-15 | 1988-06-07 | Nippon Kogaku K. K. | Automatic focus adjustment camera |
| US4907025A (en) * | 1986-10-27 | 1990-03-06 | Nikon Corporation | Automatic focusing camera |
| EP0748043A3 (en) * | 1995-06-07 | 1998-06-10 | LOEWE OPTA GmbH | Automatic volume control |
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