KR900003161Y1 - Automatic dubbing system - Google Patents

Abstract

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Description

Automatic dubbing system

1 is a circuit diagram of the present invention.

2 is an input / output waveform diagram of the main part of FIG. 1 when the tape is rewound.

FIG. 3 shows the input and output waveforms for the main part of FIG. 1 when the tape has been rewound.

* Explanation of symbols for main parts of the drawings

1: Deck for playback 2: Deck for playback and recording

3: Pulse generator F ₁ -F ₄ : JK type flip-flop

SW: Automatic Dubbing Switch Q ₁ -Q ₄ : Transistor

SL ₁ : Rewind Life (LEAF) switch for playback

SL ₂ : Rewind life (LEAF) switch for playback and recording

I ₁ -I ₇ : Inverter AN: Endgate

R ₁ -R ₆ : Resistor C ₁ , C ₂ : Capacitor

The present invention relates to an automatic dubbing system of a double cassette, and in particular, when a user selects an automatic dubbing switch, each tape inserted in the deck is automatically rewound and a dubbing operation can be started when rewinding is completed. It is about.

In the conventional double cassette, when the dubbing function is to be performed, the recording tape is inserted into the deck for playback and recording, and the playback tape is inserted into the playback deck. Select to perform a dubbing operation.

However, there was an inconvenience of dubbing as described above after the user selects the corresponding switch to rewind the recording tape and the playback tape inserted into each deck.

Therefore, the present invention was devised to solve the same conventional defects, and when the user selects a dubbing switch after inserting a recording tape and a playback tape into each deck, the tapes in each deck are automatically rewound. The object of the present invention is to provide a system for the dubbing operation.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment that can achieve the object of the present invention as described above.

FIG. 1 is an automatic dubbing system of the present invention, which outputs a pulse-down edge signal output from a pulse generator 3 composed of resistors R ₁ -R ₃ , a capacitor C ₂ , and a transistor Q ₁ , Q ₂ . Is a clear terminal of a JK type flip-flop (hereinafter referred to as JK) (F ₁ -F ₄ ) applied to a power supply voltage (Vcc) to each input terminal (J) (K) through an inverter (I ₁ -I ₃ ). And a pulse up edge signal to the clock terminal CK of JK (F ₁ ) (F ₂ ) when the automatic dubbing switch SW is selected.

On the other hand, the signal output from the output terminal Q of JK (F ₁ ) (F ₂ ) is transferred to the rewind (REW) terminal of the playback deck 1 and the rewind (REW) terminal of the deck 2 for playback and recording. Let each be applied.

When the tape inserted in the two decks is rewound, the LEAF switch SL ₁ (SL ₂ ) is turned “off” to apply a signal applied at that time, that is, a pulse-down edge signal JK (F ₃ ) (F ₄ ). Is applied to the clock terminal CK.

In addition, the signal output from each output terminal (Q) of JK (F ₃ ) (F ₄ ) is applied to the input terminal of the AND gate (AN) and the emitter terminal is grounded through the resistor (R ₅ ) (R ₆ ). The collector terminals are applied to the base terminals of the transistors Q ₁ and Q ₂ connected to the clear terminal CR of the JK F ₁ and F ₂ , respectively.

On the other hand, the output signal multiplied by the AND gate (AN) through the inverter (I ₄ , I ₅ ), (I ₆ , I ₇ ) the playback terminal (PLAY) of the playback deck (1) and the deck for playback and recording ( The system of the present invention is achieved by applying to the recording terminal REC of 2).

The operation of the present invention having the configuration as described above will be described with reference to the accompanying waveform diagram.

First, the playback tape and the recording tape are inserted into each deck to examine the operation of automatically rewinding the two tapes when the user selects the automatic dubbing switch (SW).

In the pulse generator 3, the falling reset pulse as shown in A of FIG. 2 is delayed and developed as B in FIG. 2 through the inverters I _{1 to} I ₃ , respectively, and JK (F ₁ -F ₄ ) is generated. JK (F ₁ -F ₄ ) is in a clear state because it is applied to each clear terminal CR.

At this time, when the user who wants to dub "on" the automatic switch SW, a pulse-up edge clock pulse as shown in C of FIG. 2 is applied to the clock terminal CK of JK (F ₁ ) (F ₂ ). The output terminal (Q) signal of F ₁ ) (F ₂ ) becomes a “high” signal as shown in D of FIG. 2 to each rewind terminal REW of the deck 1 for playback and the deck 2 for playback and recording. The two tapes start rewinding as if the user had selected the rewind switch.

During this rewind, the life switches SL ₁ and SL ₂ are in continuous contact from the moment the tape starts rewinding, so the clock terminal CK of JK (F ₃ ) (F ₄ ) is a “high” signal. Is maintained, the output signal of the JK (F ₃ ) (F ₄ ) output terminal Q becomes " low " and is applied to the base terminal of the transistor Q ₃ (Q ₄ ) and the AND gate (AN). Is input.

Therefore, since the transistors Q ₃ and Q ₄ are "off", the clear terminal CR of the JK (F ₁ ) (F ₂ ) becomes a "high" state, and the output is not changed and is applied to the rewind terminal REW continuously. The low signal output to the AND gate AN is applied to the reproduction terminal PLAY and the recording terminal REC through the inverters I ₄ , I ₅ and I ₆ and I ₇ . Continue rewinding.

The following describes the dubbing operation with reference to the waveform diagram of FIG. 3 when the relief switch SL ₁ (SL ₂ ) is " off " after the rewind operation is completed.

First, when the tape inserted in the playback deck 1 has been rewound, the leaf switch SL ₁ is automatically " off " so that the clock terminal CK of the JK F ₃ has a pulse-down edge like A in FIG. Since the signal is applied, the signal of the JK (F ₃ ) output terminal Q is output from the "low" to the "high" signal as shown in B of FIG. 3 to the base terminal of the transistor Q ₃ through the resistor R ₅ . When applied to one input terminal of the AND gate (AN), the clear terminal (CR) of the JK (F ₁ ) is applied to the "low" signal is reset to output the JK (F ₁ ) output terminal (Q) The signal becomes " low ", so that the play deck 1 applies the " low " signal to the rewind terminal REW without performing the rewind operation, and the AND gate " AN " Low "signal is applied to the play terminal PLAY and the record terminal REC through the inverters I ₄ , I ₅ and I ₆ , I ₇ so that the deck 1 for playback is in the stopped state and The playback and recording deck 2 continues the rewind operation.

When the playback and recording deck 2 continues the rewind operation as described above, the leaf switch SL ₂ is automatically " off ", so that the pulse of the clock terminal CK in JK (F ₄ ) CK is shown in FIG. The down-edge signal is applied and the signal output from the output terminal Q of JK (F ₄ ) is inverted from "low" to "high" as D of FIG. 3 and applied to the other input terminal of the AND gate AN. At the same time, resistor R ₆ is applied to the base terminal of pass transistor Q ₄ .

Therefore, when the transistor Q ₄ is "on", the signal applied to the clear terminal CR of the JK (F ₂ ) is reset to the "low" state, so the output signal of the JK (F ₂ ) output terminal (Q) is It becomes " low " and is applied to the rewind terminal REW of the playback and recording deck 2 so that the rewind operation is stopped.

In addition, since the level of the two signals input to the AND gate (AN) is in the "high" state, the output of the AND gate (AN) becomes a "high" signal as shown in E of FIG. 3 and the inverters I ₄ and I ₅ (I). ₆ , I ₇ ), since a "high" signal is applied to the playback terminal PLAY of the playback deck 1 and the recording terminals REC of the deck 2 for playback and recording, respectively, after the delay is performed, the dubbing operation is performed.

In this case, the AND gate (AN) plays a role of matching the time for the dubbing operation from the beginning after the reproducing tape and the recording tape are completely rewound.

The effect of the present invention operating as described above has the advantage that the user can automatically dub from the beginning when the tape to be dubbed when the user "on" the automatic dubbing switch is completed.

Claims (1)

JK-type flip-flop F ₁ (F ₂ ) and a reverse switch in which the signal output from the pulse generator 3 is inverted to be a clear signal and the signal applied by the automatic dubbing switch SW is a clock pulse. JK-type flip-flop F ₃ and F ₄ for latching an input using a pulse applied by the operation of (SL ₁ ) (SL ₂ ) as a clock pulse, and the JK-type flip-flop F ₃ (F ₄ ) Transistors Q ₃ and Q ₄ for switching the signal applied to the clear terminal CR of the JK flip-flop F ₁ and F ₂ , and the JK flip-flop F ₃ and F ₄ ) The AND gate (AN) and the inverter (I ₁ -I ₇ ), etc., which cause the double cassette to dub by multiplying the output of the output, and when the automatic dubbing switch (SW) is "on", playback and recording tapes are respectively An automatic dubbing system, characterized in that it is configured to rewind and dub from the beginning.