JPS5827420A - Electronic tuning type receiver - Google Patents

Electronic tuning type receiver

Info

Publication number
JPS5827420A
JPS5827420A JP12567381A JP12567381A JPS5827420A JP S5827420 A JPS5827420 A JP S5827420A JP 12567381 A JP12567381 A JP 12567381A JP 12567381 A JP12567381 A JP 12567381A JP S5827420 A JPS5827420 A JP S5827420A
Authority
JP
Japan
Prior art keywords
circuit
tuning
signal
state
frequency
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
Application number
JP12567381A
Other languages
Japanese (ja)
Inventor
Kazuyasu Sakaguchi
阪口 一康
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP12567381A priority Critical patent/JPS5827420A/en
Publication of JPS5827420A publication Critical patent/JPS5827420A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18Automatic scanning over a band of frequencies

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To perform presetting with one operation, by storing a reception frequency automatically, at the moment when the state is transferred from a nonturning state to a tuning state. CONSTITUTION:When any boadcast signal is received by operating an automatic channel selecting switch 6' and automatically sweeping a reception frequency, an output of a channel selection stop instruction detecting circuit 22 is changed from a low level to a high level and the reception frequency is fixed. The change in the output of the circuit 22 is differentiated at a differentiation circuit consisting of a capacitor 27 and a resistor 26 and this differentiating pulse makes a transistor 25 conductive momentarily. Thus, since a control circuit 20 can store the reception frequency for a prescribed time, when the broadcast signal is received and one of presetting and channel selecting switches 1b-5b is immediately closed momentarily, the frequency under reception can be stored in a storage circuit 24.

Description

【発明の詳細な説明】 本発明は可変容量ダイオードを同調回路に組込み、上記
ダイオードに印加する電圧を変えることで同調周波数す
なわち受信周波数を可変するようにした電子同調型受信
機に関し、その目的とするところは選局を容易にするた
め希望の放送の受信周波数を予め受信機に記憶させる操
作いわゆるプリセット操作を簡単に行なえるようにする
とともに受信機の構成を簡略化してコストの低減を7図
ることにある。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronically tuned receiver in which a variable capacitance diode is incorporated into a tuning circuit, and the tuning frequency, that is, the reception frequency is varied by changing the voltage applied to the diode. In order to make it easier to select a station, we have made it easy to perform a so-called preset operation, which is an operation in which the reception frequency of the desired broadcast is memorized in advance in the receiver, and we have also simplified the configuration of the receiver to reduce costs. There is a particular thing.

従来におけるこの種の電子同調型受信機は、たとえば第
1図〜第3図に示すように構成されていた。第1図は受
信機の正面を示しておシ、1〜5はプリセット兼選局釦
で、各々、中央部を支点として上側、下側がそれぞれ抑
圧できるシーソー動作型の釦である。6は自動選局釦で
、中央部を支点に右側を押すと、受信周波数が自動的に
高くなリ、左側を押すと受信周波数が自動的に低くなる
ようになっている。7は受信周波数をディジタル表示す
る周波数表示部、8は受信レベルをディジタル表示する
ディジタルレベル、t−タ、9はFM・AM切換釦、1
oは電源スイッチ釦である。第゛2図は受信機の回路構
成を示しており、11は受信アンテナ、12はFM−A
Mフロントエンド、13はフロントエンド12内の局部
発振回路である。上記フロント1エンド12はアンテナ
11がら入力された高周波信号を増幅し、中間周波信号
に変換して出力するものである。14は中間周波増幅回
路、16は検波回路、16はミューティング回路、17
はステレオ放送受信の場合、検波回路からのステレオ合
成信号を左、右チャンネル信号に分離するマルチプレッ
クス回路、18a、18bは音声信号出力端子である。
Conventional electronic tuning receivers of this type have been constructed as shown in FIGS. 1 to 3, for example. FIG. 1 shows the front side of the receiver, and 1 to 5 are preset/tuning buttons, each of which is a seesaw type button whose upper and lower sides can be suppressed using the center as a fulcrum. Reference numeral 6 is an automatic tuning button, and when you press the right side of the button at the center, the receiving frequency will automatically increase, and when you press the left side, the receiving frequency will automatically decrease. 7 is a frequency display unit that digitally displays the reception frequency; 8 is a digital level that digitally displays the reception level; 9 is an FM/AM switching button; 1
o is a power switch button. Figure 2 shows the circuit configuration of the receiver, where 11 is the receiving antenna, 12 is the FM-A
M front end 13 is a local oscillation circuit within the front end 12. The front end 12 amplifies the high frequency signal input from the antenna 11, converts it into an intermediate frequency signal, and outputs the same. 14 is an intermediate frequency amplification circuit, 16 is a detection circuit, 16 is a muting circuit, 17
18a and 18b are audio signal output terminals; 18a and 18b are multiplex circuits that separate the stereo composite signal from the detection circuit into left and right channel signals in the case of stereo broadcast reception;

19は上記局部発振回路(可変容量ダイオードを用いた
電圧制御発振回路)13の発振周波数を可変するための
PLL(Phase Locked Loop)回路い
わゆる位相同期回−路、20は上記プリセット兼選局ス
イッチ1〜6−や自負選局スイッチ6のスイッチ群21
からの指令により、上記位相同期回路19に、局部発振
信号変更の指令信号、換言すれば受信周波数指令信号を
供給するマイクロコンピュータで構成された制御回路で
ある。22は自動選局動作中に、受信機が何らかの放送
信号を受信したかどうか、直接的には中間周波信号が出
力されたか否かを検出して、中間周波信号が出力された
ときに制御回路21に対して受信周波数固定の指令を出
力する選局停止指令検出回路である。23はマルチプレ
ックス回路17の出力をレベルメータ8に表示させるた
めのレベルメータ駆動回路である。第3図は制御回路2
0とその周辺部分を示しており、1a〜6aは第1図に
示すプリセット兼選局釦1〜6の上側を押すことで閉じ
られる常開型のプリセット準備スイッチ、1b〜6bは
上記釦1〜6の下側を押すことで閉じられる常開型のプ
リセット兼選局スイッチ、6′は第1図の自動選局釦6
の右−側を押すことで可動接片が固定端子aに接続され
、左側を押すことで可動接片が固定端子すに接続される
自動選局スイッチである。上記プリセット準備スイッチ
1a〜6aは並列接続されて制御回路2oの端子1,8
間に接続されている。この端子1,8を瞬時、閉じれば
制御回路2o内の記憶回路24が図示しないタイマー回
路の働きで一定時間だけ受信周波数(直接的には位相制
御回路19への指令信号)を記憶可能な状態になる。上
記プリセット兼選局スイッチ1b〜6bは一端が共通化
されて制御回路20の、端子7に接続され、他端はそれ
ぞれ端子2〜6に接続されている。上記端子7と端子2
〜6のいずれか1つを、上記記憶可能時間中に瞬時、閉
じれば、現在受信中の受信周波数が記憶回路24に記憶
され、上記記憶可能時間外に閉じれば、記憶回路24に
記憶された受信周波数の放送が受信可能となる。自動選
局スイッチ6′はその可動接片が制御回路2oの端子1
0に接続され、固定端子a、bがそれぞれ端子11,9
に接続されている。上記端子1oと端子11,9のいず
れか一方を閉じれば、その間中、受信周波数が自動的に
高上なる方向あるいは低くなる方向に掃引される。
19 is a PLL (Phase Locked Loop) circuit for varying the oscillation frequency of the local oscillation circuit (voltage controlled oscillation circuit using a variable capacitance diode) 13; 20 is the preset/tuning switch 1; Switch group 21 of ~6- and pride selection switch 6
This is a control circuit composed of a microcomputer that supplies a command signal for changing the local oscillation signal, in other words, a reception frequency command signal, to the phase synchronization circuit 19 according to a command from the phase synchronization circuit 19. 22 detects whether or not the receiver receives any broadcast signal during automatic channel selection operation, directly detects whether or not an intermediate frequency signal is output, and controls the control circuit when the intermediate frequency signal is output. This is a tuning stop command detection circuit that outputs a command to fix the receiving frequency to the station 21. 23 is a level meter drive circuit for displaying the output of the multiplex circuit 17 on the level meter 8. Figure 3 shows control circuit 2
0 and its surrounding parts, 1a to 6a are normally open preset preparation switches that are closed by pressing the upper side of the preset and channel selection buttons 1 to 6 shown in FIG. 1, and 1b to 6b are the buttons 1 above. - A normally open preset/tuning switch that can be closed by pressing the bottom of 6, 6' is the automatic tuning button 6 in Figure 1.
This is an automatic channel selection switch in which the movable contact piece is connected to the fixed terminal a by pressing the right side of the switch, and the movable contact piece is connected to the fixed terminal A by pressing the left side of the switch. The preset preparation switches 1a to 6a are connected in parallel to terminals 1 and 8 of the control circuit 2o.
connected between. If these terminals 1 and 8 are momentarily closed, the storage circuit 24 in the control circuit 2o is in a state where it can store the reception frequency (directly the command signal to the phase control circuit 19) for a certain period of time by the action of a timer circuit (not shown). become. The preset/tuning switches 1b-6b have one end commonly connected to the terminal 7 of the control circuit 20, and the other end connected to the terminals 2-6, respectively. Terminal 7 and terminal 2 above
If any one of 6 to 6 is momentarily closed during the memorizable time, the reception frequency currently being received will be stored in the memory circuit 24, and if it is closed outside the memorizable time, the received frequency will be stored in the memory circuit 24. Broadcasts on the reception frequency can be received. The automatic tuning switch 6' has a movable contact piece connected to terminal 1 of the control circuit 2o.
0, and fixed terminals a and b are connected to terminals 11 and 9, respectively.
It is connected to the. When either the terminal 1o or the terminals 11 and 9 are closed, the receiving frequency is automatically swept upward or downward during that time.

このような従来の電子同調型受信機において、フリセッ
ト操作は次のようにして行なわれていた。
In such conventional electronically tuned receivers, the presetting operation is performed as follows.

すなわち、たとえば自動選局釦6の右側部分を押して受
信周波数を自動的に高めていき、その過程で放送信号が
受信されると、選局停止指令検出回路22が高(5)レ
ベルの選局停止指令信号を出力し受信周波数を固定する
。この状態でプリセット兼選局釦1〜6のうちの1つの
上側部分を押して制御回路20の端子1,8を短絡し受
信周波数の記憶が可能な状態にする。この後、直ちに上
記釦の′下側部分を押してスイッチ1b〜6bの対応す
るものを閉じると、受信中の放送の周波数が記憶される
。この後、再び自動選局釦6を操作し、次の放送が受信
されたところで、別のプリセット兼選局釦の上側部分を
押して下側部分を押すという操作を行なうことで、次の
放送周波数が記憶される。
That is, for example, when the right side of the automatic tuning button 6 is pressed to automatically increase the receiving frequency and a broadcast signal is received in the process, the tuning stop command detection circuit 22 selects a high (5) level tuning. Outputs a stop command signal and fixes the receiving frequency. In this state, the upper part of one of the preset/tuning buttons 1 to 6 is pressed to short-circuit terminals 1 and 8 of the control circuit 20, making it possible to store the received frequency. Thereafter, when the user immediately presses the lower part of the button to close the corresponding switches 1b to 6b, the frequency of the broadcast being received is stored. After that, operate the automatic tuning button 6 again, and when the next broadcast is received, press the upper part of another preset/tuning button and press the lower part to switch to the next broadcast frequency. is memorized.

このようにして記憶された周波数はプリセット兼選局釦
の下側部分のみ押すことによっていわゆる選局操作をす
ることによって読出され、直ちにその放送が受信される
The frequency thus stored is read out by pressing only the lower part of the preset/tuning button to perform a so-called tuning operation, and the broadcast is immediately received.

このように従来の電子同調型受信機では、プリセットを
行ガうのに、プリセット兼選局釦の上側部分をまず押し
てから、次に下側部分を押すという2段階操作を行なう
必要があったため、操作が゛面倒で、素人にはわかシ難
く、しかも時間がかがるものであった。加えて、構成の
面からはプリセット兼選局スイッチ1b〜6bに対応さ
せてプリセット準備スイッ1チ1a〜6aを設け、結線
しなければならないことから、その分、構成が複雑にな
り組立て難くコスト高となるものであった。
In this way, with conventional electronically tuned receivers, in order to perform a preset, it was necessary to perform a two-step operation of first pressing the upper part of the preset/tuning button and then pressing the lower part. However, it was cumbersome to operate, difficult for amateurs to understand, and time-consuming. In addition, from a configuration standpoint, the preset preparation switches 1a to 6a must be provided and wired in correspondence with the preset and channel selection switches 1b to 6b, which makes the configuration more complicated, difficult to assemble, and costly. It was very expensive.

そこで本発明はこのような従来の欠点を解消し、プリセ
ット操作も、先述の選局操作と同様、1回の操作で行な
えるようにし、操作を簡単にすると共に、構成も簡略化
して、コストの低減を図ろうとするものである。
Therefore, the present invention solves these conventional drawbacks, and allows the preset operation to be performed in a single operation in the same way as the aforementioned channel selection operation, thereby simplifying the operation, simplifying the configuration, and reducing costs. The aim is to reduce the

以下に本発明の実施例について第4図以降の図面と共に
説明する。本実施例の電子同調型受信機は第2図に示す
構成を基本とするもので、第4図、以降の図面中、第1
図〜第3図におけるのと同一構成部分には同一番号を付
して説明を簡略化する。
Embodiments of the present invention will be described below with reference to the drawings from FIG. 4 onwards. The electronic tuning type receiver of this embodiment is based on the configuration shown in FIG. 2, and in FIG.
Components that are the same as those in FIGS. 3 to 3 are given the same numbers to simplify the explanation.

第3図は第1の実施例を示しており、その構成上の特徴
は制御回路2oの端子1,8をNPN型トランジスタ2
6のコレクタ・エミッタを介して連結シ、このトランジ
スタ26のペースを抵抗26を介して接地すると共にコ
ンデンサ27を介して選局停止指令検出回路22の出力
端に接続したことにある。この第1実施例において、そ
の動作を説明すると、自動選局スイッチ6′を操作して
、受信周波数を自動的に掃引させ、何らかの放送信号が
受信されると、先述したように選局停止指令検出回路2
2の出力が低(L)レベルから高(5)レベルに変化し
て、受信周波数が固定される。上記検出回路22の出力
のLからHへの立上り変化はコンデンサ27と抵抗26
による微分回路で微分され、その出力である微分パルス
が、トランジスタ26を瞬時、導通状態にする。これに
よって制御回路2oは一定時間だけ受信周波数の記憶が
可能な状態となるので、放送信号が受信された時点で直
ちにプリセット兼選局スイッチ1b〜5bの1つを瞬時
閉じれば、受信中の周波数が記憶回路24に記憶される
FIG. 3 shows the first embodiment, and its structural feature is that the terminals 1 and 8 of the control circuit 2o are connected to the NPN transistor 2.
The base of this transistor 26 is grounded through a resistor 26 and connected through a capacitor 27 to the output terminal of the tuning stop command detection circuit 22. In this first embodiment, the operation will be described. The automatic tuning switch 6' is operated to automatically sweep the reception frequency, and when some broadcast signal is received, the tuning stop command is issued as described above. Detection circuit 2
The output of No. 2 changes from low (L) level to high (5) level, and the receiving frequency is fixed. The rise change of the output of the detection circuit 22 from L to H is caused by the capacitor 27 and the resistor 26.
It is differentiated by a differentiating circuit according to the present invention, and its output, a differential pulse, momentarily turns on the transistor 26. This enables the control circuit 2o to store the reception frequency for a certain period of time, so if one of the preset and tuning switches 1b to 5b is instantaneously closed as soon as a broadcast signal is received, the frequency being received can be stored. is stored in the storage circuit 24.

このように上・配薬1の実施例によれば、何の放送も受
信されていない状態から何らかの放送が受信される状態
に移った瞬間、すなわち非同調状態力iら同調状態に移
った瞬間、自動的に受信周波数の記憶が可能な状態とな
るので、従来のプリセット準備スイッチ1a〜6bは不
要となり、プリセット操作も、選局動作と同様、プリセ
ット兼選局釦を1回押すだけで行なえる。なお放送受信
中に、別のプリセット兼選局釦を押すと、プリセット動
作は行なわれず、選局動作が行なわれて、別の放送が受
信される。
In this way, according to the example of drug distribution 1 above, the moment when the state changes from the state where no broadcast is received to the state where some broadcast is received, that is, the moment when the state shifts from the unsynchronized state force i to the synchronized state. Since the reception frequency is automatically memorized, the conventional preset preparation switches 1a to 6b are no longer necessary, and the preset operation can be performed just by pressing the preset/tuning button once, just like the channel selection operation. Ru. Note that if another preset/tuning button is pressed while receiving a broadcast, the preset operation is not performed, the tuning operation is performed, and another broadcast is received.

次に第6図は第2の実施例を示しており、その特徴は制
御回路20の端子1,8を瞬時短絡させるスイッチング
トランジスタ28の制御信号として、選局停止指令検出
回路22のミューティング端子22aから出力されるミ
ューティング信号を用いた点にある。まず、このミュー
ティング信号について、第2図を用いて説明すると、先
述した自動選局動作中に、何らかの放送が受信されるま
では上記ミューティング端子22aのレベルIri高閲
レベルであり、このHレベル出力によってミューティン
グ回路16が働き、検波信号がカットされ、音声が出な
くなる。したがって自動選局中に雑音が耳につかなくな
る。もちろん、何らかの放送が受信されると、上記ミー
−ティング端子22aの出力は低(L)レベルとなって
検波信号のカットは解除される。
Next, FIG. 6 shows a second embodiment, the feature of which is that the muting terminal of the tuning stop command detection circuit 22 is used as the control signal of the switching transistor 28 that instantaneously shorts the terminals 1 and 8 of the control circuit 20. The point is that the muting signal outputted from 22a is used. First, to explain this muting signal using FIG. 2, during the automatic channel selection operation described above, the level of the muting terminal 22a is at the high level until some broadcast is received, and this H The muting circuit 16 is activated by the level output, the detected signal is cut off, and no sound is produced. Therefore, noise becomes inaudible during automatic channel selection. Of course, when some broadcast is received, the output of the meeting terminal 22a becomes low (L) level, and the cut of the detection signal is canceled.

このようなミューティング信号を用いている第6図の回
路構成は、制御回路20の端子1,8をPNP型トラン
ジスタ28のコレクタ・エミッタを介して連結し、この
トランジスタ28のペースをコンデンサ29、抵抗3o
を介して接地すると共に、コンデンサ29、抵抗3o相
互の接続点を上記ミューティング端子22aに接続した
ものである。この第2の実施例において、その動作を説
明すると、自動選局動作中は、上記ミューティング端子
22aの出力かHレベルであるが、これはコンデンサ2
9によってカットされ、トランジスタ28は遮断状態に
ある。次に放送が受信されるとミューティング端子22
aの出力はLレベルとなり、コンデンサ29に充電され
ていた電荷電圧の極性が反転して負の微分パルスがトラ
ンジスタ28を瞬時導通させ、第1の実施例の場合と同
様、゛プリセット操作が行なえる。
The circuit configuration shown in FIG. 6, which uses such a muting signal, connects the terminals 1 and 8 of the control circuit 20 through the collector and emitter of a PNP transistor 28, and connects the terminals 1 and 8 of the control circuit 20 to the capacitor 29, resistance 3o
The mutual connection point between the capacitor 29 and the resistor 3o is connected to the muting terminal 22a. In this second embodiment, the operation will be explained. During the automatic tuning operation, the output of the muting terminal 22a is at H level, but this is due to the capacitor 2.
9, the transistor 28 is in the cut-off state. When the next broadcast is received, the muting terminal 22
The output of a becomes L level, the polarity of the charge voltage charged in the capacitor 29 is reversed, and a negative differential pulse momentarily turns on the transistor 28, so that the preset operation cannot be performed as in the case of the first embodiment. Ru.

第6図は第3の実施例を示しており、その特徴は制御回
路20の端子1,8を瞬時短絡させるスイッチングトラ
ンジスタ31の制御信号として、レベルメータ8を駆動
するための直流信号(本実施例では検波信号)を用いた
点にある。第6図の回路構成は制御回路の端子1,8を
PNP型トランジスタ31のコレクタ・エミッタを介し
て接続し、このトランジスタ310ベースをコンデンサ
32、抵抗33を介して電源端子34に接続し、コンデ
ンサ32、抵抗33相互の接続点をNPN型トランジス
タ36のコレクタ・エミッタを介して接地し、このトラ
ンジスタ35のベースヲ抵抗36を介して接地すると共
に抵抗37を介してレベルメータ駆動回路23の入力端
に接続したものである。この第3の実施例において動作
を説明すると、自動選局動作中は、トランジスタ36が
遮断状態にあり、電源電圧によってコンデンサ32の電
源側端に正電圧が帯電されるも、トランジスタ31には
ベースバイアスが印加されないため、このトランジスタ
31は遮断状態にある。何らかの放送が受信されてレベ
ルメータがレベル表示を行なうと、トランジスタ36の
ベース電圧が徐々に増加し、所定値以上になるとトラン
ジスタ36は導通する。これによってコンデンサ32の
一端が接地され、他端に負のパルスが発生して、トラン
ジスタ31が瞬時、導通する。後は先の実施例と同様に
、プリセット操作が行なえる。
FIG. 6 shows a third embodiment, the feature of which is that a DC signal for driving the level meter 8 (in this embodiment In the example, the detection signal) is used. In the circuit configuration shown in FIG. 6, terminals 1 and 8 of the control circuit are connected via the collector-emitter of a PNP transistor 31, and the base of this transistor 310 is connected to the power supply terminal 34 via a capacitor 32 and a resistor 33. 32, the connection point between the resistors 33 is grounded through the collector-emitter of the NPN transistor 36, and the base of this transistor 35 is grounded through the resistor 36, and connected to the input terminal of the level meter drive circuit 23 through the resistor 37. It is connected. To explain the operation in this third embodiment, during the automatic channel selection operation, the transistor 36 is in a cut-off state, and although the power supply voltage charges the power supply side end of the capacitor 32 with a positive voltage, the transistor 31 is not connected to the base. Since no bias is applied, this transistor 31 is in a cut-off state. When some broadcast is received and the level meter displays the level, the base voltage of the transistor 36 gradually increases, and when it reaches a predetermined value or more, the transistor 36 becomes conductive. As a result, one end of the capacitor 32 is grounded, a negative pulse is generated at the other end, and the transistor 31 becomes conductive for an instant. After that, preset operations can be performed in the same manner as in the previous embodiment.

このように上述した3つの実施例では、同調がとれた時
点から、一定時間、自動的に受信周波数を記憶可能な状
態が作り出される。なお上記各実施例で、トランジスタ
の極性をPNP 、NPN。
As described above, in the three embodiments described above, a state is created in which the received frequency can be automatically stored for a certain period of time from the time when tuning is achieved. In each of the above embodiments, the polarity of the transistor is PNP or NPN.

逆にすることもでき、トランジスタ以外のシリコン制御
整流子いわゆるSCR等の他のスイッチング素子を用い
て構成することもできる。
It can also be reversed, and it can also be constructed using other switching elements other than transistors, such as silicon controlled commutators, so-called SCRs.

以上説明したように本発明の電子同調型受信機は、何ら
かを放送を受信するようになった時点いわゆる同調時点
から一定時間、自動的に受信周波数の記憶いわゆるプリ
セットを可能としたものであるので、従来のようにプリ
セット操作を2回の操作で行なう必要はなく、プリセッ
トスイッチを1回操作するだけでプリセットが行なえ、
しかも従来のプリセット準備スイッチは不要となるので
、組立て易く、ニス1トの低減が可能となる。
As explained above, the electronically tuned receiver of the present invention is capable of automatically storing and presetting the reception frequency for a certain period of time from the time when it starts to receive a broadcast, the so-called tuning time. Therefore, there is no need to perform the preset operation twice as in the past, and the preset can be performed just by operating the preset switch once.
Moreover, since the conventional preset preparation switch is not required, assembly is easy and the amount of varnish can be reduced.

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

第1図は従来の電子同調型受信機の正面図、第2図はそ
の構成を示す図、第3図は同要部回路図、第4図〜第6
図は本発明の実施例における電子同調型受信機の要部回
路図である。 1b〜6b・・・・・・プリセット兼選局スイッチ、6
′・・・・・・自動選局スイッチ、13・・・・・・局
部発振回路、16…・・・検波回路、17−・・・lI
I+マルチグレックス回路、19・・・・・・位相制御
回路、20・・・・・・・制御回路、21・・・・・・
・スイッチ群、22パ・・・・・選局停止指令検出回路
、22a・・・・・・ミューティング端子、23・・・
・・・レベルメータ駆動回路、24・・・・・・記憶回
路、25 、28 、31.35・・・・・・スイッチ
ングトランジスタ。
Figure 1 is a front view of a conventional electronically tuned receiver, Figure 2 is a diagram showing its configuration, Figure 3 is a circuit diagram of its main parts, and Figures 4 to 6.
The figure is a circuit diagram of a main part of an electronically tuned receiver according to an embodiment of the present invention. 1b~6b...Preset/tuning switch, 6
'... Automatic tuning switch, 13... Local oscillation circuit, 16... Detection circuit, 17-... lI
I+multiplex circuit, 19... phase control circuit, 20... control circuit, 21...
・Switch group, 22pa... Tuning stop command detection circuit, 22a... Muting terminal, 23...
... Level meter drive circuit, 24 ... Memory circuit, 25 , 28 , 31.35 ... Switching transistor.

Claims (4)

【特許請求の範囲】[Claims] (1)  プリセットスイッチと、該スイッチを操作す
ることによって受信周波数を記憶する記憶回路と、受信
機が非同調状態から同調状態に移行することによってレ
ベルが変化する制御信号を受けて導通状態が自動的に制
御されるスイッチング素子を備え、上記スイッチング素
子が導通状態になることによって上記記憶回路が自動的
に受信周波数を記憶可能な状態となるように、上記スイ
ッチング素子と記憶回路を関連付けてなる電子同調型受
信機。
(1) A preset switch, a memory circuit that memorizes the reception frequency by operating the switch, and a conduction state that automatically changes in response to a control signal whose level changes when the receiver shifts from an untuned state to a tuned state. an electronic device comprising: a switching element that is controlled automatically, and in which the switching element and a memory circuit are associated with each other so that when the switching element becomes conductive, the memory circuit automatically enters a state in which the received frequency can be stored; Tunable receiver.
(2)制御信号として選局停止指令検出回路から出力さ
れる自動選局動作停止用の選局停止指令信号を用いてな
る特許請求の範囲第1項記載の電子同調型受信機。
(2) The electronic tuning receiver according to claim 1, which uses a tuning stop command signal for stopping automatic tuning operation outputted from a tuning stop command detection circuit as a control signal.
(3)制御信号として、自動選局動作中に音声出力をカ
ットするためのミューティング信号を用いてなる特許請
求の範囲第1項記載の電子同調型受信機。
(3) The electronically tuned receiver according to claim 1, wherein the control signal is a muting signal for cutting audio output during automatic channel selection.
(4)制御信号として、受信信号のレベルを表示するだ
めの直流信号を用いてなる特許請求の範囲第1項記載の
電子同調型受信機。
(4) The electronically tuned receiver according to claim 1, wherein the control signal is a direct current signal that indicates the level of the received signal.
JP12567381A 1981-08-11 1981-08-11 Electronic tuning type receiver Pending JPS5827420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12567381A JPS5827420A (en) 1981-08-11 1981-08-11 Electronic tuning type receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12567381A JPS5827420A (en) 1981-08-11 1981-08-11 Electronic tuning type receiver

Publications (1)

Publication Number Publication Date
JPS5827420A true JPS5827420A (en) 1983-02-18

Family

ID=14915823

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12567381A Pending JPS5827420A (en) 1981-08-11 1981-08-11 Electronic tuning type receiver

Country Status (1)

Country Link
JP (1) JPS5827420A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59140532U (en) * 1983-03-10 1984-09-19 三洋電機株式会社 preset receiver
JPS60152861U (en) * 1984-03-21 1985-10-11 日本電気ホームエレクトロニクス株式会社 Vehicle transmission
JPS60182551U (en) * 1984-05-14 1985-12-04 日産ディーゼル工業株式会社 Automatic transmission for vehicles
JPS60182550U (en) * 1984-05-14 1985-12-04 日産ディーゼル工業株式会社 Automatic transmission for vehicles
JPS60182552U (en) * 1984-05-14 1985-12-04 日産ディーゼル工業株式会社 Automatic transmission for vehicles
JPS62125024U (en) * 1986-01-30 1987-08-08
JPS63167998A (en) * 1986-12-29 1988-07-12 能美防災株式会社 Constant setter for disaster prevention equipment

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59140532U (en) * 1983-03-10 1984-09-19 三洋電機株式会社 preset receiver
JPH026677Y2 (en) * 1983-03-10 1990-02-19
JPS60152861U (en) * 1984-03-21 1985-10-11 日本電気ホームエレクトロニクス株式会社 Vehicle transmission
JPH0217245Y2 (en) * 1984-03-21 1990-05-14
JPS60182551U (en) * 1984-05-14 1985-12-04 日産ディーゼル工業株式会社 Automatic transmission for vehicles
JPS60182550U (en) * 1984-05-14 1985-12-04 日産ディーゼル工業株式会社 Automatic transmission for vehicles
JPS60182552U (en) * 1984-05-14 1985-12-04 日産ディーゼル工業株式会社 Automatic transmission for vehicles
JPS62125024U (en) * 1986-01-30 1987-08-08
JPS63167998A (en) * 1986-12-29 1988-07-12 能美防災株式会社 Constant setter for disaster prevention equipment

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