KR920007427Y1 - Blank skip circuit - Google Patents

Abstract

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Description

Blank Skip Circuit

The figure shows a blank-skip circuit according to the invention.

* Explanation of symbols for main parts of the drawings

1: mussel shell type switch unit 2: amplification and double voltage rectifying unit

3: first detection part 4: first inversion part

5: equalization amplifier 6: voltage stabilizer

7: first flanger portion 8: second flanger portion

9: third flanger 10: motor

11: deck control unit 12: automatic reverse sensor

13: second inversion unit 14: second detection unit

15: third inverting unit 16: motor control unit

The present invention relates to a blank-skip circuit of an automatic reversing cassette tape recorder. Particularly, a blank space between the front and rear end of the tape is changed to switch the program for the cassette tape front and back operation so that the first record sound is played back. It relates to a blank-skip circuit which allows the period to be fast forwarded (FF).

In general, a cassette tape recorder apparatus was used to pull out a tape mounted on a deck and to refit it, in order to play the record sound on the back side after the record sound on the front of the tape was completed.

To remedy the above drawbacks, the tape is mounted on the deck, and then the front side of the tape is regenerated and the end of the front tape is detected by the sensor to reverse the tape to play the record sound on the back without pulling out the tape. However, there was a disadvantage in that unnecessary time was consumed before the tape first record sound was played at the rear end of the tape. To compensate for this, deck control ICs have been developed, ordered, and used as a single chip. However, this has the disadvantage of being expensive to order and being impossible to use except specified circuits.

It is therefore an object of the present invention to provide a simple universal blank-skip circuit that can be used in any autoreverse cassette record apparatus.

According to the present invention, in the blank-skip circuit which makes the flanger detachable by the control signal of the deck control unit, the blank tape portion of the cassette tape record apparatus is advanced at high speed and brought into a normal play state when the record sound is restarted. The MUTUAL RESET TYPE SWITCH section 1, which is connected from SW and whose output transitions from the "high" level to the "low" level during ON operation of the switch, amplifies the sound recorded on the tape. A first detection part connected from the equalizing amplifier 5 and connected to be enabled in accordance with the output signals of the first and second flanger parts 7 and 8 which detect the blank for a predetermined time and allow the tape to rewind and FF. 3) and the second detection unit 14 and the second detection unit 14 and the connection from the Rewind output display level I ₂ of the deck controller 11 and its output the Pro / PLY control of the deck controller 11 A third inverting portion 15 connected to a ruler, the third inverting portion 15 for inverting an input signal, the third inverting portion 15 for inverting an input signal, and the equalizing amplifier 5 The FF output display terminal of the resell type switch unit 1 and the deck control unit 11 are connected to be enabled according to an output signal, and the input signal is amplified and double-voltage rectified, and the output terminal is connected to the FF of the deck control unit 11. The amplification and double voltage rectifying unit 2 connected to the / REW control terminal and the third flanger unit 9 for program switching and to be enabled according to the output signal of the mussel-cell switch unit 1; The output terminal is connected to the FF / REW control terminal of the deck control unit 11, the second inverting unit 13 for inverting the input signal, and the mussellissel type switch unit connected from the first detection unit 3 According to the output signal of (1) Doedoe connected to enable its output characters characterized by consisting of a first reflecting part (4) for inverting a signal input is connected to the FF / REW control terminal of the deck controller 11.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a blank-skip circuit diagram according to the present invention, in which a mutual reset type switch unit 1 connected from a blank-skip switch SW having one terminal grounded is a three-state of the second inverting unit 13. Enable terminal of the element S5, enable terminal of the three state element S4 of the third inverting portion 15, enable terminal of the three state element S3 of the first inversion portion 4, and amplification and double voltage It is connected to the enable terminal of the three-state element S1 of the rectifier 2.

An equalizer amplifier 5 which amplifies the sound recorded on the tape detects a blank space of the buffer amplifier Q7 of the amplification and double voltage rectifying unit 2, for example, 15 seconds, via the capacitors C5 and C6, respectively. It is connected to one input terminal of the buffer amplifier Q5 of the first detection unit 3 and the operational amplifier U3 of the second detection unit 14 which detects a blank of the tape, for example, for 0.1 second.

The output terminal of the buffer amplifier Q7 of the amplifying and double voltage rectifying unit 2 passes through the capacitor C1, the diode D2, the three states S1 and S2, and then inverts the second inverting unit 13 through the diodes D3 and D5. It is connected to the output terminal of the gate G3. The connection point of the capacitor C1 and the diode D2 and the connection point of the three state S1 and the diode D2 are respectively grounded via the diode D1 and the capacitor C2, respectively.

The output terminal of the buffer amplifier Q5 of the first detector 3 is connected to one input terminal of the operational amplifier U2, and the remaining input terminal of the operational amplifier U2 is connected to the Vcc terminal via the resistor R1 and simultaneously via the capacitor C3. The output terminal is grounded and is connected to the input terminal of the three state S3 of the first inverting portion 4. The output terminal of the three state S3 is connected to the FF / REW control terminal of the deck control unit 11 via the inverting gate G2 and the diode D4. (REW; Rewind)

The remaining input terminal of the operational amplifier U3 of the second detecting unit 14 is connected to the Vcc terminal via the resistor R2 and grounded through the capacitor C4, and the output terminal thereof is the three state S4 of the third inverting unit 15. Is connected to one input terminal of the NAND gate A1, and its output terminal is connected to the Pro / PLY (Program / Play) control terminal of the deck controller 11.

The FF output terminal of the deck control unit 11 is connected to the base terminal of the transistor Q1 to which the emitter terminal is grounded, and the collector terminal of the transistor Q1 is connected to the Vcc terminal via the coil 1 of the first flanger 7. Connected. In addition, the collector terminal of the transistor Q1 is connected to the enable terminal of the operational amplifier U3 via the diode D6 and the buffer amplifier Q6 of the second detector 14, and is operated through the inverted gate G1 of the first detector 3. It is connected to the enable terminal of amplifier U2.

The Rew (Rewind) output terminal of the deck control unit 11 is connected to the base terminal of the transistor Q2 to which the emitter terminal is grounded, and the collector terminal of the transistor Q2 is connected to the Vcc terminal via the second flanger 8 coil L2. Connected. In addition, the collector terminal of the transistor Q2 is connected to the connection point of the inverting gate G1 of the diode D6 and the first detection unit 3 via the diode D8 (FF / Rew Plunger is inverted when the program is switched).

The Pro / PLY output terminal of the deck control unit 11 is connected to the base terminal of the transistor Q3 to which the emitter terminal is grounded, and the collector terminal of the transistor Q3 is connected to the Vcc terminal via the coil L3 of the third flanger unit 9. Connected. The collector terminal of the transistor Q3 is connected to the three state S of the second inverting portion 13 via the diode D10, and the three state S5 is connected to the inverting gate G3. On the other hand, the relay protection diodes D7, D9 and D11 are connected in parallel to both ends of the relay coils L1, L2 and L3. However, the detachable state of the flanger by the flanger coils L1, L2, and L3 is omitted for simplicity of the drawings.

The FF display terminal I1 of the deck control unit 11 is connected to the enable terminal of the three state S2 of the amplifying and double voltage rectifying unit 2, and the Rew display terminal I2 is the AND gate A1 of the third inverting unit 13. Is connected to the rest of the input terminals.

In addition, the deck control unit 11 is connected to the Vcc terminal via the voltage stabilizer (6), and is configured to be connected to the automatic reverse rotation sensor unit 12, the control terminal of the motor 10 of the deck control unit 11 Emmy The terminal terminal is connected to the base terminal of the transistor Q4 which is grounded, and the collector terminal of the transistor Q4 is grounded via the motor control unit 16 and the motor 10.

Referring to the operation of the present invention configured as described above are as follows.

When the tape (not shown) is playing (the motor 10 is operated by the motor control unit 16 by outputting a "low" level signal from the motor control terminal of the deck control unit 11). When the switch SW is turned ON, the output of the mussel-liquid switch unit 1 transitions from the "high" level state to the "low" level state, so that the three states S1 and the first inverting part 4 of the amplifying and double voltage rectifying unit 2 are changed. ), The three state S3 of the 2nd inversion part 13, and the three state S4 of the 3rd inversion part 15 are enabled. When the tape is in the PLAY state, " high " level signals are output from the FF, Rew and Pre / PLAY output terminals of the deck control unit 11 so that the transistors Q1, Q2 and Q3 are turned on, so the flanger coils L1, L2 and L3 is activated to attach the flange (not shown) to the deck (not shown). Therefore, the potential of each connection point of the transistor Q1 and the plunger coil L1 and each connection point of the transistor Q2 and the plunger coil L2 becomes an "O" potential, so that the complete amplifier Q6 of the second detector 14 is disabled and the second The inverting gate G1 of the one detection unit 3 is enabled. At this time, if the signal amplified by the equalizing amplifier 5 is no longer than 15 seconds (blank state), the output of the operational amplifier U2 of the first detection unit 3 generates a square wave of "high" level in the "low" level state. After generation, the inverted gate G2 of the first inverting unit 4 is inverted and applied to the FF / REW terminal of the deck control unit 11 in a "low" level so that the FF output terminal becomes a "low" level. The transistor Q1 is turned off.

Since the transistor Q1 is turned off, no current flows through the flanger coil L1, so that the flanger (not shown) connected to the deck is dropped, and the blank tape portion is advanced at high speed. At this time, the "low" level signal is output from the FF display terminal I1 of the deck control unit 11 so that the three-state S2 of the amplifying and double-voltage rectifying unit 2 is turned ON. Since the transistor Q3 is turned off by outputting a "low" level signal from the Pro / PLY output terminal of the deck control unit 11 by detecting the reverse rotation sensor unit 12, the program is switched by the flanger coil L3 so that the back of the tape operates. Turn. At this time, the potential of the connection point of the flanger coil L3 and the diode D10 is in the "high" potential state, but is inverted in the second inverting unit 13 so that the FF / REW control terminal of the deck control unit 11 is in the "low" level state. Therefore, the FF operation is continued, and the first record sound of the tape is amplified by the equalization amplifier 5 and applied to the amplification and double voltage rectifier 2.

The amplification and double voltage rectifying unit 2 amplifies the input record signal in the buffer amplifier Q6 and rectifies the double voltage in the capacitors C1 and C2, the diodes D1 and D2, and the deck control unit via the three states S1 and S2 and the diode D3. When the "high" level signal is applied to the FF / REW control terminal of (11), the "low" level signal is output from the REW output terminal, so the tape is rewinded and the transistor Q2 is turned off. Since the transistor Q2 is turned off, the flanger coil L2 and the diode D8 connection point are at the " high " level to enable the second detector 14 and the first detector 3 to be disabled.

When the second detector 14 is enabled and no record sound is output from the equalizing amplifier 5, for example, for 0.1 second or more, the operational amplifier U3 outputs a square wave of "high" level. The " high " level signal and the " high " level signal of the Rewind display terminal I2 of the deck control unit 11 are synthesized at the AND gate A1 and applied to the Pro / PLY terminal of the deck control unit 11 in a " low " level state. Since the FF and Rew output terminals of the deck control unit 11 output the " high " level signal, the deck has a flanger to reproduce the sound recorded on the tape.

As described above, according to the configuration of the present invention, there is an effect that a general blank-skip circuit that can be used for any automatic reverse cassette record apparatus can be provided.

Claims (7)

In the blank skip circuit which makes the flanger detachable by the control signal of the deck control unit, and advances the blank tape portion of the cassette tape recording device at high speed, and makes the normal play state when the record sound starts again, it is connected from the blank switch SW. When the switch is turned ON, the output is connected from the mux-cell-type switch unit 1, which transitions from the "high" level to the "low" level, and from the equalizing amplifier 5 which amplifies the sound recorded on the tape, for a predetermined time. First detection part 3 and first detection part 14 which are connected alternately to enable detection of blanks during the operation but according to the output signals of the second and first flanger parts 7 and 8 for rewinding and FF the tape. And the second detection unit 14 and the deck control unit 11 are connected from the Rewind output display terminal I ₂ , and the output terminal thereof is connected to the Pro / PLY control terminal of the deck control unit 11. A third inverting portion 15 connected to be enabled in accordance with an output signal of the cell type switch 1 and inverting an input signal, and connected from the equalizing amplifier 5 to the mussel resizing switch 1 And FF output display terminal I ₁ of the deck control unit 11 is connected to be enabled, amplifies and rectifies the input signal, and its output terminal is an FF / REW control terminal of the deck control unit 11. An amplifying and double voltage rectifying unit 2 connected to the third and second plunger sections 9 for program switching and being enabled according to an output signal of the mute type switch section 1, the output terminal of the A second inverting unit 13 connected to the FF / REW control terminal of the deck control unit 11 and inverting the input signal, and an output signal of the mute switch unit 1 connected from the first detecting unit 3; To be enabled according to Output terminals, characterized in that blanks composed of a first reflecting part (4) for inverting a signal input is connected to the FF / REW control terminal of the deck controller 11-skip circuit. The method of claim 1, wherein the amplifying and double voltage rectifying unit (2) is connected to the capacitor C ₁ , diode D ₂ , three states S ₁ and S ₂ in order from the buffer amplifier Q ₅ , the both ends of the diode D ₂ A blank-skip circuit, characterized in that it is configured to be grounded via D ₁ and capacitor C ₂ , respectively. 2. The first detector (3) is characterized in that one input terminal is connected to the Vcc terminal via a resistor (R ₁₎ and grounded via a capacitor (C ₃₎ and the other input terminal is connected from a buffer amplifier (Q ₅₎ . And an operational amplifier U ₂ to which the inverting gate G ₁ is connected to the enable terminal. The method of claim 1, wherein the second detection unit 14 is a bite-force terminal via a resistor R ₂ ground by at the same time via the capacitor C ₄ is connected to the Vcc terminal and the other input terminal of the equalization amplification unit (5) A blank-skip circuit having an output as an input, wherein the enable terminal comprises an operational amplifier U ₃ to which a buffer amplifier Q ₆ is connected. 2. The blank-skip circuit according to claim 1, wherein said first and second inverting portions (4 and 13) are configured such that one three state element and one inverting gate are connected in series. 2. The blank-skip circuit according to claim 1, wherein said third inverting portion (15) comprises an AND gate A ₁ to which three states S ₄ are connected to _one input terminal. 2. The blank-skip circuit according to claim 1, wherein reverse current preventing diodes D ₃ and D ₅ are reversely connected between the amplifying and double voltage rectifying section (2) and the second inverting section (13).