JPS6029059Y2 - Automatic song selection circuit for tape recorder - Google Patents
Automatic song selection circuit for tape recorderInfo
- Publication number
- JPS6029059Y2 JPS6029059Y2 JP1979169261U JP16926179U JPS6029059Y2 JP S6029059 Y2 JPS6029059 Y2 JP S6029059Y2 JP 1979169261 U JP1979169261 U JP 1979169261U JP 16926179 U JP16926179 U JP 16926179U JP S6029059 Y2 JPS6029059 Y2 JP S6029059Y2
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- circuit
- frequency
- output
- tape recorder
- 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
Links
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Description
【考案の詳細な説明】
本考案はテープレコーダの自動選曲回路の改良に関し、
周波数補正用フィルタを必要としない自動選曲回路に係
るものである。[Detailed description of the invention] This invention relates to the improvement of the automatic music selection circuit of a tape recorder.
This invention relates to an automatic music selection circuit that does not require a frequency correction filter.
従来の自動選曲回路は第１図のブロックダイアグラムに
示すように構成される。A conventional automatic music selection circuit is constructed as shown in the block diagram of FIG.
即ち、再生ヘッド１の出力側とイコライザアンプ２の入
力側が接続され、該イコライザアンプ２の出力側と無信
号検出回路３の入力側とが、抵抗Ｒ１、Ｒ２、Ｒ３及び
コンデンサＣ１、Ｃ２にて構成された周波数補正用フィ
ルタ４及びスイッチ５を介して接続される。That is, the output side of the playback head 1 and the input side of the equalizer amplifier 2 are connected, and the output side of the equalizer amplifier 2 and the input side of the no-signal detection circuit 3 are connected through resistors R1, R2, R3 and capacitors C1, C2. It is connected via the configured frequency correction filter 4 and switch 5.
６はテープレコーダメカニズムをテープ高速走行状態か
ら再生状態に制御するためのプランジャで、前記無信号
回路３の出力側に接続される。A plunger 6 is connected to the output side of the no-signal circuit 3 for controlling the tape recorder mechanism from a high-speed tape running state to a reproducing state.
７は抵抗Ｒ４、Ｒ５、Ｒｅ及びトランジスタ８にて構成
された周知のモニタミューティング回路で、前記スイッ
チ５と連動し、自動選曲時に発する不愉快な高周波音を
カットするためのものである。Reference numeral 7 designates a well-known monitor muting circuit composed of resistors R4, R5, Re, and a transistor 8, which operates in conjunction with the switch 5 to cut unpleasant high-frequency sounds generated during automatic music selection.
而して前記スイッチ５を導通状態にすると、自動選曲検
出信号成分は前記周波数補正用フィルタ４を介して無信
号検出回路回路３に印加され、無信号検出時にプランジ
ャ６に電流が供給され、テープレコーダのメカニズムが
制御されることになる。When the switch 5 is turned on, the automatic music selection detection signal component is applied to the no-signal detection circuit 3 via the frequency correction filter 4, and when no signal is detected, current is supplied to the plunger 6, and the tape is The recorder mechanism will be controlled.
ここで従来例に於ては何故前記周波数補正用フィルタ４
が必要であるかについて以下に若干述べる。Here, in the conventional example, why is the frequency correction filter 4
I will briefly discuss below whether this is necessary or not.
自動選曲する場合は巻戻し又は早送り状態にて再生信号
を検出するのでその周波数ｆ１は次式により表わせれる
。In the case of automatic music selection, since the reproduction signal is detected in the rewind or fast forward state, the frequency f1 is expressed by the following equation.
■ ｆ ｔ” Ａ ” ｆ ｏｙ。■ f t”A”f oy.
ｆｏ＝定速時の再生周波数
■ｏ：定速時のテープ走行速度
Ｖｌ：早送り又は巻戻し走行速度
Ａ：定数
従ってこの自動選曲検出信号の周波数１１は通常の再生
信号の周波数ｆ。fo = playback frequency at constant speed o: tape running speed at constant speed Vl: fast forward or rewind running speed A: constant Therefore, the frequency 11 of this automatic song selection detection signal is the frequency f of the normal playback signal.
より遥かに高くなる。そのため自動選曲検出に害を及ぼ
す低域成分をカットしく例えばハム成分等を有信号とし
て検出される虞れがある。It will be much higher. Therefore, in order to cut low-frequency components that harm automatic music selection detection, there is a risk that, for example, a hum component or the like may be detected as a signal.
）必要な高域成分のみを通過させるための周波数補正用
フィルタ４が必要となる。) A frequency correction filter 4 is required to pass only necessary high-frequency components.
ところで第３図イは再生ヘッド１出力の周波数特性を示
すグラスであり、ハは前記再生ヘッド１よりの出力が前
記イコライザアンプ２を通過した後の周波数特性を示す
グラフであるが、無信号検出回路３へ印加する信号は前
述のように高周破成分のみとしなければならないので、
へのグラフに示されたようなフラットな周波数特性のま
までは適当でなく、第４図に示すような高域部の持上っ
た特性を有する周波数補正フィルタ４を介して印加する
必要がある。By the way, FIG. 3A is a graph showing the frequency characteristics of the output of the playback head 1, and C is a graph showing the frequency characteristics after the output from the playback head 1 passes through the equalizer amplifier 2. As mentioned above, the signal applied to circuit 3 must contain only high-frequency components, so
It is not appropriate to maintain a flat frequency characteristic as shown in the graph of FIG. .
従って、従来は周波数補正フィルタ４を必要としていた
ものである。Therefore, conventionally, the frequency correction filter 4 was required.
本考案は再生ヘッド１出力の周波数特性（第３図イ）と
周波数補正フィルタ４の周波数特性（第４図）の形状の
類似性に着目してなされたもので、従来例のような周波
数補正フィルタ４を使用することなく、アンプ２にイコ
ライザ特性を与えるための負帰環回路９を不動作とし斯
るアンプ２をフラットアンプとして再生ヘッド１の出力
を増幅し、直接無信号検出回路３に印加するものである
。The present invention was developed by focusing on the similarity in shape between the frequency characteristics of the output of the playback head 1 (Fig. 3 A) and the frequency characteristics of the frequency correction filter 4 (Fig. 4). Without using the filter 4, the negative feedback circuit 9 for giving equalizer characteristics to the amplifier 2 is made inactive, and the output of the playback head 1 is amplified by using the amplifier 2 as a flat amplifier, and the output is directly sent to the no-signal detection circuit 3. It is applied.
なお、前述のように再生ヘッド１の出力の周波数特性と
周波数補正用フィルタ４の周波数特性が類似していると
ころから、再生ヘッド１の出力をイコライザアンプ２を
介さず直接無信号検出回路３へ印加させる方法も考えら
れるが、この場合再生ヘッド１の出力が無信号検出回路
３を駆動するのに充分なゲインを有さないことがあり、
ときによっては別途に信号を増幅する必要がでてくる虞
れがある。As mentioned above, since the frequency characteristics of the output of the playback head 1 and the frequency characteristics of the frequency correction filter 4 are similar, the output of the playback head 1 is directly sent to the no-signal detection circuit 3 without going through the equalizer amplifier 2. A method of applying it may also be considered, but in this case, the output of the reproducing head 1 may not have sufficient gain to drive the no-signal detection circuit 3.
In some cases, it may be necessary to separately amplify the signal.
本考案は斯る問題を解決しつつも、前記周波数補正用フ
ィルタ４を必要としない自動選曲回路に関するもので、
以下一実施例につき図面に従い詳述する。The present invention relates to an automatic music selection circuit that solves such problems but does not require the frequency correction filter 4.
One embodiment will be described in detail below with reference to the drawings.
なお、従来例との関係に於て同一構成物品には同一番号
を付す。Incidentally, in relation to the conventional example, the same components are given the same numbers.
１は再生ヘッドで一端がアースされ、他端はイコライザ
アンプ２の入力側に接続される。Reference numeral 1 denotes a playback head, one end of which is grounded, and the other end connected to the input side of an equalizer amplifier 2.
該イコライザアンプ２からはイコライザ特性を与えるた
め抵抗Ｒ７とコンデンサＣ３とが並列接続されてなる負
帰環回路９が引出され、該負帰環回路９はスイッチ１０
のＯＮ、ＯＦＦによって動作が選択される。A negative feedback loop circuit 9 consisting of a resistor R7 and a capacitor C3 connected in parallel is drawn out from the equalizer amplifier 2 to provide equalizer characteristics, and the negative feedback loop circuit 9 is connected to a switch 10.
The operation is selected by turning on or off.
また前記イコライザアンプ２の出力側は従来例と同様の
ミューティング回路７の入力側に接続され、該ミューテ
ィング回路７の出力側は可変抵抗ＶＲを介してモニタ用
のメインアンプ１２の入力側に接続される。Further, the output side of the equalizer amplifier 2 is connected to the input side of a muting circuit 7 similar to the conventional example, and the output side of the muting circuit 7 is connected to the input side of a main amplifier 12 for monitoring via a variable resistor VR. Connected.
更にモニタ用のメインアンププ１２の出力側はスピーカ
１３に接続される。Further, the output side of the main amplifier 12 for monitoring is connected to a speaker 13.
前記イコライザアンプ２の出力側は抵抗Ｒ８を介して前
記スイッチ１０の可動接片１４にも接続され、該スイッ
チ１０の可動接片１４が負帰環回路９のための第１接点
１１から第２接点１５に切換つた際無信号検出回路３に
アンプ出力が印加される。The output side of the equalizer amplifier 2 is also connected to the movable contact piece 14 of the switch 10 via a resistor R8, and the movable contact piece 14 of the switch 10 connects the first contact 11 to the second contact point 11 for the negative feedback circuit 9. When the contact 15 is switched, the amplifier output is applied to the no-signal detection circuit 3.
更に無信号検出回路３の出力側はメカニズムを制御させ
るためのプランジャ６に接続される。Further, the output side of the no-signal detection circuit 3 is connected to a plunger 6 for controlling the mechanism.
従って本考案回路により自動選曲する場合は、前記スイ
ッチ１０の可動接片１４と第２接点１５を接続し、再生
ヘッド１からの出力信号をアンプ２を通じて無信号検出
回路３に印加すればよい。Therefore, when automatically selecting songs using the circuit of the present invention, the movable contact piece 14 of the switch 10 and the second contact 15 may be connected, and the output signal from the playback head 1 may be applied to the no-signal detection circuit 3 through the amplifier 2.
負帰環回路９を働かせていない場合のイコライザアンプ
２の周波数特性は第３図二に示すようにフラットになっ
ているの、該イコライザアンプ２を通過した信号の周波
数特性は再生ヘッド１よりの出力がそのまま増幅される
だけで形状に変化はなく、第３図ホに示すように高域が
持上った形状となっている。The frequency characteristics of the equalizer amplifier 2 when the negative feedback circuit 9 is not activated are flat as shown in FIG. There is no change in the shape, just the output is amplified as is, and the shape has a raised high frequency range, as shown in Fig. 3(e).
依って第４図に示す周波数補正フィルタ４の周波数特性
に類似する形状となり、周波数補正用フィルタ４を必要
としない。Therefore, the shape is similar to the frequency characteristic of the frequency correction filter 4 shown in FIG. 4, and the frequency correction filter 4 is not required.
また、再生ヘッド１の出力をそのまま直接無信号検出回
路３へ印加するわけでもないので、充分増幅でき無信号
検出回路３を駆動するのに充分なゲインを得ることもで
きる。Further, since the output of the reproducing head 1 is not directly applied to the no-signal detection circuit 3 as it is, it is possible to sufficiently amplify it and obtain a gain sufficient to drive the no-signal detection circuit 3.
以上述べたように本考案回路は簡単なスイッチ操作だけ
でイコライザアンプをフラットアンプとして自動選曲の
ために用いることが出来るので、安価な自動選曲回路を
提供することが出来るものである。As described above, the circuit of the present invention can be used as an equalizer amplifier as a flat amplifier for automatic music selection with a simple switch operation, and therefore an inexpensive automatic music selection circuit can be provided.
第１図は従来例の回路を示すブロックダイヤグラム、第
２図は本考案の一実施例を示すブロックダイヤグラム、
第３図イ９口、ハは再生ヘッドの出力イコライザアンプ
及びイコライザアンプを通過した出力の夫々の周波数特
性を示すグラフ、第３図二、ホはイコライザ特性を与え
ていない場合のイコライザアンプの周波数特性及び該イ
コライザアンプを通過した出力の夫々の周波数特性を示
すグラフ、第４図は周波数補正用フィルタの周波数特性
を示すグラフである。
１・・・・・・再生ヘッド、２・・・・・・イコライザ
アンプ、３・・・・・・無信号検出回路、６・・・・・
・プランジャ、９・・・・・・負帰環回路 １０・・・
・・・スイッチ。FIG. 1 is a block diagram showing a conventional circuit, and FIG. 2 is a block diagram showing an embodiment of the present invention.
Figure 3 A9 and C are graphs showing the respective frequency characteristics of the output equalizer amplifier of the playback head and the output that has passed through the equalizer amplifier. Figure 3 B and E are the frequencies of the equalizer amplifier when no equalizer characteristics are provided. Graphs showing the characteristics and the frequency characteristics of the outputs passed through the equalizer amplifier, and FIG. 4 is a graph showing the frequency characteristics of the frequency correction filter. 1...Playback head, 2...Equalizer amplifier, 3...No signal detection circuit, 6...
・Plunger, 9... Negative feedback circuit 10...
···switch.
Claims (1)
るか否かを選択するスイッチを接続し、自動選曲動作を
行なう場合前記スイッチにより前記アンプにイコライザ
特性を与えることなくそのアンプ出力を直接無信号検出
回路に印加し、該無信号検出回路の出力側にメカニズム
制御用プランジャを接続したことを特徴とするテープレ
コーダの自動選曲回路。When a switch for selecting whether or not to give equalizer characteristics to the amplifier connected to the playback head is connected, and automatic song selection operation is performed, the switch is used to directly detect the amplifier output without giving equalizer characteristics to the amplifier. An automatic music selection circuit for a tape recorder, characterized in that a mechanism control plunger is connected to the output side of the no-signal detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979169261U JPS6029059Y2 (en) | 1979-12-05 | 1979-12-05 | Automatic song selection circuit for tape recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979169261U JPS6029059Y2 (en) | 1979-12-05 | 1979-12-05 | Automatic song selection circuit for tape recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5686689U JPS5686689U (en) | 1981-07-11 |
| JPS6029059Y2 true JPS6029059Y2 (en) | 1985-09-03 |
Family
ID=29680101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1979169261U Expired JPS6029059Y2 (en) | 1979-12-05 | 1979-12-05 | Automatic song selection circuit for tape recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6029059Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5646022B2 (en) * | 1973-07-03 | 1981-10-30 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS618412Y2 (en) * | 1979-09-14 | 1986-03-15 |
-
1979
- 1979-12-05 JP JP1979169261U patent/JPS6029059Y2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5646022B2 (en) * | 1973-07-03 | 1981-10-30 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5686689U (en) | 1981-07-11 |
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