KR910003018B1 - Dubbing circuit of dauble deck cassette tape recorder - Google Patents

Abstract

This has autoreverse first deck for only playback and second deck for playback/recording. Dubbing circuit offers simultaneous playback both A and B side to record from first to second deck. Heads in two decks have two windows (12',12")(13',13") to trace A side and B side of the magnetic tape. Especially dubbing circuit has playback/recording selector (10a) to switch ON/OFF playback/recording signals of A and B sides, dubbing switch (SW15)(SW16) to switch ON/OFF reproducing signals through signal processor (15) from the first deck. All control signals come from the micro-computer.

Description

Dubbing circuit of double deck cassette tape recorder

1 is an explanatory diagram showing a head used in a conventional double deck cassette tape recorder.

2 is a circuit diagram of a conventional double deck cassette tape recorder.

3A and 3B are explanatory views showing the reproduction and recording state of audio signals of a cassette tape when dubbing a conventional double deck cassette tape recorder.

4 is an explanatory diagram showing a head of the present invention.

5 is a dubbing circuit diagram of the double deck cassette tape recorder of the present invention.

6 is a signal flow diagram of the present invention.

7A and 7B are explanatory diagrams showing reproduction and recording states of audio signals of a cassette tape during duplex dubbing according to the present invention.

* Explanation of symbols for main parts of the drawings

10: play selector 10a: record / play selector

11: head body 12, 12 ', 12 ", 13, 13', 13": head window

14: reproduction equalizer amplifier 15, 19: signal processor

16, 18: amplifier 17: constant speed / double speed control unit

SP12: Speaker SW11-SW16: Switch

The present invention provides a double-deck cassette tape recorder having an autoreverse type first deck for playback and a second deck for recording / playback, wherein dubbing is performed, namely, a cassette tape inserted into the first deck is used. The present invention relates to a dubbing circuit of a double-deck cassette tape recorder which reproduces and records the A side and B side tracks of the cassette tape at the same time when recording on the cassette tape inserted in the second deck.

The conventional double deck cassette tape recorder reproduces and records only one track of two tracks of the cassette tape when dubbing.

That is, the conventional double deck cassette tape recorder processes the head in which the head window 2 is formed at the lower front face of the head body 1 as shown in FIG. 1 in the signal processor 4, and in the amplifier 5 After amplified and output to the speaker SP1, a cassette tape is built into the second deck, the movable terminal of the recording / playback switch SW1 is short-circuited to the playback terminal PB, and the second deck is pressed when the play button is pressed. The head window 2B of the head installed in the circuit reproduces the signal, and the reproduced signal is amplified by the reproduction equalizer amplifier 3 through the melt / play switch SW1, and processed by the signal processor 4, and then the amplifier 5 ) Is output to the speaker SP1.

Then, the movable terminal of the recording / playback switch SW1 is short-circuited to the recording terminal REC, the dubbing switch SW2 is short-circuited, the cassette tape to be played is inserted into the first deck, and the second deck is recorded. When dubbing after inserting the cassette tape, the head window 2A reproduces the cassette tape inserted in the first deck, and the reproduction signal is amplified by the reproduction equalizer amplifier 3, and the signal processor 4 After processing, it is output to the speaker SP1 through the amplifier 5, and the reproduced signal processed by the signal processor 4 is input to the amplifier 7 through the dubbing switch SW2 and the constant speed / speed control unit 6. And amplified, processed by the signal processor 8, and applied to the head window 2B of the second deck via the recording equalizer amplifier 9 and the recording / playback switch SW1 to the cassette tape inserted into the second deck. It is recorded.

When dubbing at twice the speed, the speed / speed control unit 6 processes the playback signal according to the control signal CTL1 and doubles the drive motor for driving the cassette tapes of the first and second decks. It is driven by the double speed dubbing.

However, such a conventional double-deck cassette tape recorder reproduces the A side track of the cassette tape embedded in the first deck as shown in FIG. 3A when dubbing, and embeds it in the second deck as shown in FIG. 3B. Since you are recording on the A side track of one cassette tape, when dubbing both the A and B tracks of the cassette tape, dub the A side track first, remove the cassette tape, turn it over, and then operate the unit again to dub the B side track. It takes a lot of time because it has to be done, and it was troublesome for the user, and it was possible to edit and record in double speed mode in order to shorten the recording time. Since the sound quality is lower than when recorded in the double speed editing, there was a problem that you should take the deterioration of sound quality.

In view of such a conventional deficiency, the present invention simultaneously reproduces audio signals recorded on the A and B surfaces of the cassette tape and transmits them to the second deck using the respective panels to simultaneously transmit the A and B tracks. Invented to dub, when the present invention will be described in detail with reference to the accompanying drawings 4 to 7 as follows.

4 is an explanatory view showing the head of the present invention. As shown therein, the head windows 12 and 13 are traced to trace the B side and A side tracks of the cassette tape on the front and the bottom of the head body 11, respectively. ) Is installed on the first deck and the second deck.

5 is a dubbing circuit diagram of the double-deck cassette tape recorder of the present invention. As shown therein, the head window 12 'of the first deck is controlled by a control signal CTL11 of a microcomputer (not shown) during recording and playback. A playback selector (10) consisting of playback switches (SW11) and (SW12) of the first deck for switching the playback signals on the A side and B side of the tape input from (13 '), and the control of the microcomputer; Recording switch of the second deck to switch on and off the recording and playback signals on the A and B sides of the tape input and output to the head windows 12 "and 13" of the second deck by the signal CTL11. (4) recording / playback selection section (10a) consisting of (SW4) and recording / playback switch (SW13), and playback signals and recording / playback of the tapes A and B surfaces of the first deck output from the playback selection section (10); Playback equalizer for amplifying the playback signal on the tape A side of the second deck output from the recording / playback switch SW13 of the selection unit 10a to a predetermined level. 14, a signal processor 15 amplified from the reproduction equalizer amplifier 14 to input a reproduction signal to remove noise, and amplification of the reproduction signal output from the signal processor 15 to a predetermined level. The amplifier 16 outputs to SP12 and the playback signals on the tape A and B surfaces of the first deck output from the signal processor 15 when dubbing on and off according to the control signal CTL13 of the microcomputer. The dubbing switches SW15 and SW16 are driven by the control signal CTL12 of the microcomputer during quieting and double speed to compensate the frequency characteristics of the regenerative equalizer amplifier 14, as well as the dubbing switches SW15 and SW16. A constant speed control unit 17 for outputting a reproduction signal through the controller, and a reproduction signal of the tape A surface and the B surface of the first deck through the constant speed / speed control unit 17 and an external signal input from the external terminal EXT. An amplifier 18 for amplifying to a predetermined level; The signal processor 19 for removing noise from the reproduction signal and the external signal of the amplifier 18, and the control signal of the constant speed / speed control unit 17 controls the frequency of the reproduction signal and the external signal output from the signal processor 19. And amplifying and amplifying the signal of the tapes A and B of the amplified first deck to the recording / playback selection unit 10a, the head windows 12 ", and 13 " The recording equalizer amplifier 20 records simultaneously on the tape A side and the B side of the second deck.

Referring to the operation, effects of the present invention configured as described above in detail. First, insert the cassette tape into the first deck, press the play button of the first deck to play and listen to the tape A side of the first deck, and determine whether the microcomputer is in the playback mode or the recording mode. The control signal CTL11 is applied to the playback selection unit 10 to turn on the playback switches SW11 and SW12, and the recording / playback switch SW13 of the recording / playback selection unit 10a is turned on. The movable terminal is connected to the fixed terminal a13. Therefore, the head windows 12 'and 13' of the head provided on the first deck reproduce the signals recorded on the A side and the B side of the tape, and the reproduced signal is the regeneration switch of the regeneration selector 10. After SW11 and SW12, the amplifier 14 of the reproduction equalizer is amplified to a predetermined level and the noise is removed from the signal processor 15 and input to the amplifier 16. At this time, of the playback signals on the A and B surfaces of the tape output from the signal processor 15, the playback signal on the B surface, that is, the signal reproduced from the head window 13 ', is cut off, and the playback signal on the A surface, that is, the head window ( Only the signal reproduced from 12 'is amplified to a predetermined level through the amplifier 16 and output to the speaker SP12.

On the contrary, if the play button of the second deck is pressed to play and listen to the tape A surface of the first deck, the microcomputer applies the control signal CTL11 to the play selector 10 as described above to play the switch SW11, ( The SW12 is turned off and the control signal CTL11 is applied to the recording / playback selecting section 10a to connect the movable terminal of the recording / playback switch SW13 to the fixed terminal b13. Therefore, as shown in FIG. 7B, the head window 12 ″ of the head installed on the first deck reproduces the signal recorded on the A side of the tape, and goes to the predetermined level in the reproduction equalizer amplifier 14 through the recording / playback switch SW13. The amplified signal and the reproduced signal on the tape A side of the amplified second deck are removed from the signal processor 15 and then output to the speaker SP12 through the amplifier 16. In addition, the external terminal EXT in the recording mode. In order to record a signal input from the tuner or an external signal to the second deck, the microcomputer applies the control signal CTL11 to the recording / playback selection unit 10 to fix the movable terminal of the recording / playback switch SW13. Thus, the tuner signal and the external signal input from the external terminal EXT are connected to the amplifier 18, the signal processor 19, the recording equalizer amplifier 20, and the recording / playback switch SW13. The tape is written on the A side of the tape.

On the other hand, when dubbing the playback signal from the tape A side and the B side of the second deck to record on the tape A side and the B side of the second deck, when the user presses the dubbing button of the cassette recorder, the microcomputer recognizes and reproduces it. The playback switch SW11, SW12 of the selecting section 10 and the recording switch SW14 of the recording / playback selecting section 10a are turned on, and the movable terminal of the recording / playback switch SW13 is turned on (a13). Will be connected to. Therefore, the signals recorded on the tapes A and B of the first deck are reproduced in the head windows 12 'and 13', and the reproduced signals are reproduced by the reproduction switches SW11 and (11) of the reproduction selector 10. After the SW12, the reproduction equalizer amplifier 14, and the signal processor 15, the tape A surface is amplified by the amplifier 16 to a predetermined level and output to the speaker SP12. At the end of the dubbing switch SW16, the microcomputer judges the dubbing speed selected by the user, and in the case of double speed dubbing, the reproduction signal from the tape of the first deck has a high frequency characteristic due to double speed driving. Since the control signal CTL12 is applied to the constant speed / speed control unit 17 to switch to the double speed mode, the constant speed / speed control unit 17 is reproduced by the control signal CTL12 of the microcomputer. Recording equalizer amplifier (14) and The recording equalizer amplifier 20 is controlled to adjust the frequency characteristic value.

Then, it is determined whether the dubbing mode selected by the user is a double-sided (A side and B side of the tape) mode or a single-sided mode (A side or B side of the tape), that is, whether the dubbing button is pressed once or twice. In the case of single-sided dubbing (the dubbing button is pressed once), the microcomputer applies the control signal CTL13 to the dubbing switches SW15 and SW16 to turn on the dubbing switch SW15. Accordingly, the reproducing signal of the tape A surface of the first deck output from the signal processor 15 has the frequency characteristics of the recording equalizer amplifier 20 through the constant speed / speed control unit 17, the amplifier 18, and the signal processor 19. After being compensated, it is applied to the head window 12 "of the second deck through the record / playback switch SW13 of the record / playback selector 10a to be recorded on the A side of the tape.

In the case of double-sided dubbing (the dubbing button is pressed twice), the microcomputer applies the control signal CTL13 to the dubbing switches SW15 and SW16 to turn on the dubbing switches SW15 and SW16. Let's go. Therefore, the reproduction signal is transmitted from the signal processor 15 to the tape A and B surfaces of the first deck through the constant speed / double speed control unit 17, the amplifier 18, and the signal processor 19. After the frequency characteristic is compensated, the second window is applied to the head windows 12 "and 13" of the second deck through the recording / playback switch SW13 and the playback switch SW13 of the recording / playback selection unit 10a. The A and B sides of the tape inserted into the deck are simultaneously dubbed, that is, the head windows 12 'and 13' of the first deck are located on the A and B side tracks of the cassette tape as shown in FIG. At the same time, signals are reproduced, and as shown in FIG. 7B, the head windows 12 " and 13 " of the second deck are simultaneously recorded on tracks A and B of the cassette tape. In this case, in order to play without dubbing, the cassette tapes A inserted into the first and second decks can be played and listened. After listening to the A sides, the tapes can be removed, flipped over, and then played by playing the B side.

As described in detail above, the present invention dubs the A side and B side tracks of the cassette tape, thereby reducing the dubbing time when dubbing both sides as well as removing the hassle of flipping the cassette tape during dubbing. There is.

Claims (1)

A double-deck cassette tape recorder having a first deck dedicated for playback and a first deck dedicated for recording / reproducing, wherein the head window (upper and lower front) of the head body (11) is traced to trace the A side and the B side of the cassette tape, respectively. 12 ', 12 "), (13', 13") to form the head mounted on the first and second decks, and the head window 12 'by the control signal CTL11 of the microcomputer during recording and playback. ) And (13 ') the playback selection section 10 for switching playback signals on and off of the A and B surfaces of the tape, and the head window 12 "of the second deck by the control signal CTL11. Recording / playback selection section 10a for switching the recording and playback signals of the A and B sides of the tapes input and output to " 13 " Playback equalizer amplification for amplifying the playback signals on the A and B planes of one deck and the A plane playback signals of the second deck output to the recording / playback selection unit 10a to a predetermined level. (14), a signal processor (15) for processing the output signal of the reproduction equalizer amplifier (14), and an amplifier for amplifying a reproduction signal outputted to the signal processor (15) to a predetermined level and outputting it to the speaker (SP12). (18), dubbing switches (SW15) and (SW16) for switching on / off the reproduction signals of the A and B surfaces of the first deck output from the signal processor (15) when dubbing, and the microcomputer at constant speed and double speed. And a constant speed / speed control unit 17 for compensating the frequency characteristics of the reproduction equalizer amplifier 3 by outputting a reproduction signal through the dubbing switches SW15 and SW16 by driving by a control signal of the same. After receiving the signal from the control unit 17 through the amplifier 18 and the signal processor 19 and amplifying the signal to a predetermined level, the head window 12 ″ of the second deck through the recording / playback selection unit 10a, ( 13 "), which is configured as a recording equalizer amplifier 20 Dubbing circuit of cassette tape recorder.

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