KR920006316B1 - Cassette tape recorder and manufacturing method with self-dubbing - Google Patents

Abstract

The cassette tape recorder for dubbing with only one deck by mixing the two signals-delayed play signal and external signal-and recording the mixed signal onto the same tape comprises a play head (30), an erase head (90), a record head (140), a time-delay circuit (100) delaying the mixed signal for a certain time and supplying the delayed signal to the record head (140) and a micom (20) controlling the system according to the command of a user.

Description

Self-dubbing cassette tape recorder and its control method

1 is a block diagram according to the present invention.

2 is a flow chart in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

10: key input unit 20: micom

30: playhead 40: equalization amplifier for reproduction

50: mixer 60: first multiplexer

70: power amplifier 80: bias oscillator circuit

90: erase head 100: time delay circuit

110: second multiplexer 120: equalization amplifier for recording

130: bias current adjustment circuit 140: recording head

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette tape recorder capable of self dubbing and a control method thereof. In particular, in a cassette tape recorder, dubbing of an external input signal to a signal reproduced as a deck is performed. A possible cassette tape recorder and a control method thereof are provided. The dubbing method in the current cassette tape recorder uses two decks. That is, one deck reproduces the signal recorded on the tape, and the other deck mixes the reproduced signal and an external input signal input through a microphone or line in terminal to record. It is supposed to be done. Therefore, the conventional dubbing method as described above has a problem that there must be two decks.

Accordingly, an object of the present invention is to provide a cassette tape recorder and a control method thereof capable of dubbing using only one deck in a cassette tape recorder.

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

1 is a block diagram according to the present invention, an external input signal terminal 200 for inputting an external input signal, a key input unit 10 for outputting a key input by a user's operation, and the key input unit 10. A micro-computer 20 which outputs the _{first to} third selection signals SEL _{1 to} SEL ₃ and the control signal CTL according to a key input, and picks up a signal recorded on a predetermined tape. A reproduction head 30 for picking up, a reproduction equalization amplifier 40 connected to the reproduction head 30 to amplify and output the picked-up reproduction signal, and the reproduction equalization amplifier 40 A mixer 50 connected to an output terminal of the output signal and the external input signal terminal 200 and outputting a mixed signal by mixing the reproduction signal and the external input signal, and the output terminal and the mixer 50 of the equalizing amplifier 40 for reproduction. Each input terminal is connected to the output terminal of the terminal and the ground of the external signal input terminal 200, respectively. First and second multiplexers 60 connected to the microcomputer 20 to select and output an input by the first to second selection signals SEL1 to SEL2, and the first multiplexer 60. A power amplifier 70 connected to an output terminal of the first multiplexer 60 and amplifying the output of the first multiplexer 60 to a speaker SPK, and connected to the microcomputer 20 and biased by the control signal CTL. A bias oscillator circuit 80 for oscillating and outputting a Bias signal, an erase head 90 connected to the bias oscillator circuit 80 for erasing a signal recorded on a predetermined tape, and an output terminal of the mixer 50; And two input terminals are connected to the time delay circuit 100 for delaying and outputting the mixed mixed signal by a predetermined time T, the output terminal of the time delay circuit 100 and the external signal input terminal 200, respectively. Select signal input terminal is connected to the microcomputer 20, A second multiplexer 110 which selects and outputs a mixed signal or an external input signal input by the third selection signal SEL3, and amplifies the mixed signal or an external input signal by being connected to an output terminal of the second multiplexer 110; A bias current adjusting circuit 130 connected between an output equalization amplifier 120 for recording and an output terminal of the bias oscillation circuit 80 and an output end of the recording equalization amplifier 120 to adjust the recording bias during recording. And a mixed signal or an external input signal, which is connected to an output terminal of the recording equalizer amplifier 120 and is located at a position T2 spaced apart from the position T1 of the playhead 30 and a predetermined interval L. It consists of a recording head 140 for recording on a tape.

In the configuration of FIG. 1, the bias current fixing circuit 130 includes a variable resistor VR having one end connected to an output terminal of the bias oscillation circuit 80, the variable resistor VR, and the recording equalizing amplifier 120. It consists of a capacitor (C1) connected between the output terminal of. In addition, the playback head 30, the erasing head 90, and the recording head 140 of the configuration shown in FIG. 1 correspond to the playback head 30, the arrow direction K, which is the driving direction of the tape 300 during playback and recording. The erasing head 90 and the recording head 140 are arranged in this order. The time delay T for delaying the mixed signal in the time delay circuit 100 is determined according to the interval L between the playhead 30 and the recording head 140.

2 is a flowchart according to the present invention, which searches for a key input and terminates if there is no key input, and if there is a key input, determines whether it is its own dubbing mode key and "lows" the first selection signal SEL1 when it is its own dubbing mode key. To output the second selection signal SEL2 to "high", to output the third selection signal SEL3 to "low", and to output the control signal CT2 to "high" to perform its own dubbing mode. In the first process and in the first process, when the key input is not the dubbing mode key, it is determined whether the recording mode key is used. If the recording mode key is selected, the first selection signal SEL1 is “high” and the second selection signal SEL2 Is outputted as "low", the third selection signal SEL3 is output as "high" and the control signal CTL is output as "high" to perform the recording mode, and in the second process If the key input is not the record mode key, it is judged whether it is the play mode key. A third process of outputting the control signal CTL to the low level by outputting the circuit SEL1 to " low " and the second selection signal SEL2 to " low " In the process, if the key input is not the play mode key, the first select signal SEL is set to "high" and the second select signal SEL2 is set to "high" and the control signal CTL is output to "low". A fourth process of muting the voice signal is performed.

Hereinafter, an operation example of FIGS. 1 to 2 according to the present invention will be described in detail. When the power is turned on and the user operates the key input unit 10 of FIG. 1 to operate in the predetermined mode and the corresponding key input is input to the microcomputer 20, the microcomputer 20 is performed in step (A1) of FIG. 2. If there is no key input, the process is terminated if there is no key input, and the process proceeds to step A2. In step (A2), it is determined whether the key input is a self-dubbing mode key, and the process proceeds to the step of backing the own dubbing mode key (A3) to perform a self-dubbing mode. That is, in step (A3), the first select signal SEL1 is set to "low", the second select signal SEL2 is set to "high", and is output to the first multiplexer 60, and the third select signal SEL3 is output. The signal is output to the second multiplexer 100 by setting it to "low" and output to the bias oscillator circuit 80 by setting the control signal CTL to "high".

At this time, the playhead 30 picks up the signal recorded on the tape 300 traveling in the direction of the arrow K, and the picked-up play signal is amplified by the equalizing amplifier 40 for reproduction and input to the first multiplexer 60. do. The external input signal input from the microphone through the external signal input terminal 200 is input to the first multiplexer 60, the mixer 50, and the second multiplexer 110. In addition, since the control signal CTL is input as "high", the bias oscillator circuit 80 oscillates a bias signal and outputs the bias signal to the erase head 90 and the bias current adjusting circuit 130. Therefore, the signal recorded on the tape 300 is erased by the erasing head 90, and the tape 300 is in a state capable of recording a predetermined signal and proceeds in the arrow direction K. FIG.

The mixer 50 mixes the reproduction signal amplified by the reproduction equalization amplifier 40 and the external input signal input through the external signal input terminal 200 to convert the mixed signal into the time delay circuit 100 and the first signal. Output to the multiplexer 60. The time delay circuit 100 inputting the mixed signal delays the mixed signal for a predetermined time T and outputs the mixed signal to the second multiplexer 110.

The second multiplexer 110 inputs the mixed signal delayed by the external input signal, the predetermined time T, and the third select signal SEL3 to select and record a mixed signal because the third select signal SEL3 is "low". Output to the equalization amplifier 120, the mixed signal is amplified in the recording equalization amplifier 120 is to be recorded on the tape 300 by the recording head 140. The bias current adjustment circuit 130 adjusts the recording bias of the mixed signal recorded on the tape 300 by the variable resistor VR and the capacitor C1. In addition, the first multiplexer 60 inputs the reproduction signal, the mixed signal, the external input signal, and the ground potential to each input terminal, and inputs the first selection signal SEL1 and the second selection signal SEL2 to the selection signal input terminal. Since the first selection signal SEL1 is "low" and the first selection signal SEL2 is "high", the mixed signal is selected and output.

Therefore, the mixed signal is amplified by the power amplifier 70 and converted into voice through the speaker SPK. At this time, the predetermined time T for delaying the mixed signal in the time delay circuit 100 is a time determined by the following equation.

In Equation (1), L is the interval between the playback head 10 and the recording head 140, and V _T represents the speed at which the tape 300 proceeds in the direction of the arrow (K). Therefore, the external input signal is mixed with the signal reproduced by the reproduction head 30, and recorded on the tape 300 at the position T1 of the reproduction head 30, thereby self-dubbing.

On the other hand, if the key input is not the own dubbing mode key in step (A2), it proceeds to step (A4) to determine whether the key input is the recording mode key. If the key input is the recording mode key (A5) in step (A4) to proceed to the recording mode. That is, in step (A5), the first select signal SEL1 is "high" and the second select signal SEL2 is "low" and is output to the first multiplexer 60, and the third select signal SEL3 is " High to output to the second multiplexer 110 and control signal CTL to high to output to the bias oscillator circuit 80. The bias oscillation circuit 80 inputting the control signal CTL "high" oscillates a bias signal and outputs the bias signal to the erase head 90 and the bias current adjustment circuit 130 as in the self-dubbing mode. Therefore, the signal recorded on the tape 300 is erased by the erasing head 90, and the tape 300 is in a state capable of recording a predetermined signal and proceeds in the arrow direction K. FIG. In addition, since the third selector signal SEL3 is input as “high”, the second multiplexer 110 selects an external input signal input through the external signal input terminal 200 and outputs the same to the recording equalizer 120 for recording. The external input signal is amplified by the recording equalization amplifier 120 to be recorded on the tape 300 by the recording head 140. The bias current adjustment circuit 130 adjusts the recording bias of the external input signal recorded on the tape 300 as in the dubbing mode.

Since the first select signal SEL1 is "high" and the second select signal SEL2 is input "low", the first multiplexer 60 selects the external input signal input through the external signal input terminal 200. To print. Therefore, the external input signal is amplified by the power amplifier 70 and converted into voice through the speaker SPK.

Therefore, the recording mode of recording the external input signal to the tape 300 and converting the voice into a voice through the speaker SPK is performed. On the other hand, if the key input is not the recording mode key in step (A4), it proceeds to step (A6) to determine whether the key input is the playback mode key. If the key input is the playback mode key in step (A6), go to step (A7) to perform the playback mode. That is, in step (A7), the first select signal SEL1 is "low" and the second select signal SEL2 is "low", and is output to the first multiplexer 60 and the control signal CTL is "low". The output is output to the bias oscillation circuit 80 as a reference.

The bias oscillation circuit 80 which inputs the control signal CTL "low" does not operate. In addition, since the first selection signal SEL1 is "low" and the second selection signal SEL2 is input "low", the first multiplexer 60 receives a reproduction signal amplified by the reproduction equalization amplifier 40 and output. Select and print. Therefore, the reproduction signal is amplified by the power amplifier 70 and converted into voice through the speaker SPK. Therefore, the playback mode in which the signal recorded on the tape 300 is reproduced and converted into audio through the speaker SPK is performed. On the other hand, if the key input is not the play mode key in step (A6), the key input is not the mode key, the recording mode key, or the play mode key, so that the key input is not stopped or fast forward or rewind. The mode is to be entered (A8). In the step (A8), the first select signal SEL1 is set to "high" and the second select signal SEL2 is set to "high" and the control signal CTL is "low". The output is output to the bias oscillation circuit 80 as a reference. Therefore, the bias oscillator 80 does not operate as in the regeneration mode.

In addition, the first multiplexer 60 selects and outputs a ground potential because the first selection signal SEL1 is “high” and the second selection signal SEL2 is input “high”. It will be muted.

As described above, the present invention has the advantage that the cassette tape recorder can dub itself as a deck by recording a mixed signal mixed with a reproduction signal and an external input signal with a predetermined time delay.

Claims (2)

The reproducing head 30, the reproducing equalization amplifier 40 and the power amplifier 70, the erasing head 90, the bias oscillator circuit 80, the recording equalizing amplifier 120, and the bias current adjusting circuit. A cassette capable of self-dubbing having a recording head 140 and a recording head 140 positioned at a position T2 at a predetermined distance from the position T1 of the reproduction head 30, and an external signal input terminal 200. In a tape recorder, a key input unit (10) for outputting a key input by a user's operation, connected to the key input unit (10), and a first-third selection signal (SEL1-SEL3) and a control signal in response to a key input. The output signal of the reproduction equalization amplifier 40 and the external signal connected to the microcomputer 20 for outputting the CTL, the output terminal of the equalization amplifier 40 for reproduction, and the external signal input terminal 200. A mixer 50 for mixing the external input signal input through the input terminal 200 and outputting a mixed signal; A bias oscillation circuit 80 connected to the circuit 20 for oscillating and outputting a bias signal by the control signal CTL, an output terminal of the equalizing amplifier 40 for reproduction, an output terminal of the mixer 50, and the external signal input. Each input terminal is connected to the terminal 200 and the ground, respectively, and two selection signal input terminals are respectively connected to the microcomputer 20 to select and output an input by the first to second selection signals SEL-SEL2. A time delay circuit 100 connected to the multiplexer 60 and an output terminal of the mixer 50 to delay and output the mixed mixed signal by a predetermined time T, an output terminal of the time delay circuit 100, and Two input terminals are respectively connected to the external signal input terminal 200 and a selection signal input terminal is connected to the microcomputer 20 to select and output a mixed signal or an external input signal input by the third selection signal SEL3. Characterized by two multiplexer 110 A cassette tape recorder that can dub itself. A microcomputer 20 connected to the key input unit 10, the key input unit 10, and outputting a first-third selection signal SEL1-SEL3 and a control signal CTL according to a key input, and a first multiplexer A cassette tape recorder control method capable of self-dubbing having a cassette tape recorder composed of a 60, a bias oscillator circuit 80, and a second multiplexer 110, searches for whether there is a key input, and terminates when there is no key input. If there is a key input, it is determined whether the self dubbing is a mode key, and when the self dubbing mode key is set, the first selection signal SEL1 is set to "low" and the second selection signal SEL2 is set to "high". A first process of outputting to the second multiplexer with the third selection signal SEL3 "low" and outputting a control signal CTL "high" to the bias oscillator circuit to perform its own dubbing mode; In the first step, the key input has its own dubbing mode key. If not, it is determined whether the recording mode key is used. If the recording mode key is selected, the first selection signal SEL1 is set to "high" and the second selection signal SEL2 is set to "low" and the third multiplexer is output. A second process of outputting to the second multiplexer with SEL3 set to “high” and outputting a control signal CTL to the bias oscillator circuit with “high” to perform a recording mode; and key input in the second process When it is not the recording mode key, it is determined whether the reproduction mode key is used, and when the reproduction mode key is used, the first selection signal SEL1 is set to "low" and the second selection signal SEL2 is set to "low" and output to the first multiplexer. And a third process of performing a regeneration mode by outputting a control signal CTL to the bias oscillation circuit in a low state, and if the key input is not a regeneration mode key in the third process, High "and the second select signal SEL2 to " high " to output to the first multiplexer. A roll signal (CTL) to "Low" is output to the bias oscillation circuit comprises a fourth process of muting the sound output.

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