KR0115160Y1 - Hifi audio double deck recording and reproducing apparatus - Google Patents

Abstract

The hi-fi audio double-tech recorder is to dub the FM signal reproduced when the audio signal is to be dubbed between the decks. A hi-fi audio double deck recording and reproducing apparatus having a first deck and a second deck for this purpose; First selecting means for selectively outputting audio signals reproduced from the first deck and the second deck; Level balance means for adjusting a level so that the audio signal output from the first selection means is output at the same level as the signal subjected to modulation and demodulation; And second selection means for controlling the selection of an output path of the audio signal so that the audio signal output from the level balancing means is applied to the deck which does not output the audio signal among the first deck and the second deck. .

Therefore, it is possible to FM-dub audio signals between tech and share a hi-fi modulation and demodulation circuit.

Description

Hi-Fi audio double deck recorder

1 is a block diagram of a hi-fi audio double tech recording and reproducing apparatus according to the present invention.

FIG. 2 is a detailed circuit diagram of the switching noise removing means shown in FIG.

3 is a partial output waveform diagram of the circuit shown in FIG.

* Explanation of symbols for main parts of the drawings

10: first reproducing amplifier 20: rewrite first amplifier

30: second reproduction amplifier 40: second recording amplifier

50: input signal selection means 60: hi-fi modulation and demodulation processing circuit

70: output control means 80: first switching means

90: switching noise removing means 100: level balance means

110: second switching means

The present invention relates to a hi-fi audio double deck recording apparatus, and more particularly, to a hi-fi audio double deck recording and reproducing apparatus for FM dubbing an audio signal between double decks.

FM dubbing is a technique for copying without undergoing a modulation process. Up to now, the double-deck recording / reproducing apparatus has been applied only to video signals having discontinuities, and has not yet been adapted to audio signals having continuity. Therefore, in the case of audio signals, dubbing is performed through a circuit for demodulating the FM signal to be reproduced and a circuit for modulating the audio signal to be demodulated and applied, and a separate dedicated demodulation circuit must be provided for each deck. In addition, there are problems that are susceptible to noise due to the modulation and demodulation circuit.

Accordingly, an object of the present invention is to provide a hi-fi audio double deck recording and reproducing apparatus for FM dubbing of an audio signal between decks without going through a modulation / demodulation circuit.

Another object of the present invention is to provide a hi-fi audio double deck recording and reproducing apparatus for sharing a hi-fi modulation and demodulation circuit when outputting an audio signal or recording an audio signal applied from the outside.

In order to achieve the above object, the present invention provides a hi-fi audio double deck recording and reproducing apparatus having a first deck and a second deck; First selecting means for selectively outputting audio signals reproduced from the first deck and the second deck; Level balance means for adjusting a level so that the audio signal output from the first selection means is output at the same level as the signal subjected to modulation and demodulation; And second selection means for controlling selection of an output path of the audio signal such that the audio signal output from the level balance means is applied to the deck which does not output the audio signal among the first deck and the second deck. It features.

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

1 is an embodiment of a hi-fi audio double deck recording and reproducing apparatus according to the present invention. The double deck recording and reproducing apparatus here includes a hi-fi video tape recorder.

1 is a first reproduction amplifier 10 for amplifying an audio signal included in the first deck 1 and picked up from a recording medium (not shown) at a predetermined amplification rate, and the first deck. (1) included in the first recording amplifier 20 and the second deck 2 for amplifying an audio signal applied for recording at a predetermined amplification rate and outputting the same to a recording medium (not shown). A second reproduction amplifier 30 for amplifying an audio signal picked up from a medium (not shown) at a predetermined amplification rate, and an audio signal applied for recording to the second deck 2 at a predetermined amplification rate. The signals output from the second recording amplifier 40, the first reproducing amplifier 10, and the second reproducing amplifier 20 for amplifying by a system controller (not shown) are selectively outputted. The first switching means 80 and the signal output from the first switching means 80 Switching noise removing means (90) for removing and outputting noise generated by the switching, and level balance means (100) for adjusting the level of the audio signal output from the switching noise removing means (90) to the same level as during modulation and demodulation (100). ), An input signal selecting means 50 for selecting an audio signal output from a tuner and an external audio signal generator by a control signal output from the system controller (not shown), and the audio signal being input signal selection. When applied by the means 50, an audio signal capable of connecting the signal output after being demodulated by the hi-fi modulation / demodulation processing circuit 60 for modulation processing and demodulation during reproduction, and by the hi-fi modulation / demodulation processing circuit 60 is connected to an external playback system. Output control means 70 for selectively outputting to a dedicated jack or RF converter, and output from the level balance means 100 at the time of recording Selectively outputs the signal modulated by the call and the hi-fi modulation and demodulation processing circuit 60 to the first recording amplifier 20, or outputs the signal output from the hi-fi modulation and demodulation processing circuit 60 and the level balance means 100. An output for outputting to the second recording amplifier 20 and for selectively outputting signals output from the first reproducing amplifier 10 and the second reproducing amplifier 40 to the hi-fi modulation / demodulation processing circuit 60 during reproduction. It consists of two switching means (110). The switching operation performed in the second switching means 110 is performed through a system controller (not shown). The second switching means 110 has a plurality of switches SW1, SW2, and SW3 for switching operations for the three cases described above.

FIG. 2 is a detailed circuit diagram of the switching noise removing means 90 shown in FIG. 1. First delay circuit 91 for delaying by a predetermined value a head switching pulse generated from a drum (not shown) as an input signal. ), The AND signal for inverting the signal output from the first delay circuit 91, the above-described head switching pulse, AND1, the signal for inverting the head switching pulse and the first delay circuit 91 Logical AND device OR1 for outputting a gating pulse by ORing the first logical AND device AND2 for AND and the output signals of the first and second AND products AND1 and AND2, A second delay circuit 92 for delaying an audio signal output from the first or second reproduction amplifiers 10 and 40 by a value delayed by the first delay circuit 91, and a second delay circuit 92; Level balance means for the next stage selectively for the audio output signal of the reproduction amplifier applied to the input stage Control switch 93 for outputting to (100).

3 is an output waveform diagram of a part of the circuit diagram shown in FIG. 2, (A) is a head switching pulse to be applied, (B) is a signal output from the first delay circuit 91, and (C) Denotes an output signal of the logical sum element OR1.

The operation of FIG. 1 will then be described in conjunction with FIGS. 2 and 3.

First of all, the present invention requires the processing of the audio signal applied from the outside or the audio signal output from the outside to be subjected to the modulation / demodulation process as before, and when the audio signal is dubbed in the double deck, the FM signal reproduced without the modulation / demodulation process is performed. By recording the data as it is, it is not necessary to have a dedicated modulation and demodulation circuit for each deck, so that the price of the system can be lowered and noise generated by the modulation and demodulation process can be reduced.

To explain the same parts as before, first, the system control unit receives an audio signal applied from a jack connected to a tuner (not shown) or an output terminal of an external audio reproducing apparatus as described above through the input signal selecting means 50. Selected and output by the control signal (not shown). The hi-fi modulation and demodulation processing circuit 60 modulates the audio signal from the input signal selecting means 50 through a modulator and outputs the audio signal to one input terminal of the second switching means 110.

The second switching means 110 is a selection means for selecting a passage so as to record or reproduce the audio signal to be applied. When the audio signal is applied from the hi-fi modulation and demodulation processing circuit 60, the first and second control switches SW1 and SW2. Is applied to one side of the contact (S1, S2).

The switching operation is controlled by the first switching switch SW1 and the second controlling switch SW2 by an input switching control signal output from a system controller (not shown). At this time, the first control switch SW1 and the second control switch SW2 are not operated in an active state at the same time. In other words, when the switch reference contact SO of the first control switch SW1 is controlled to be switched to any one of the first contact S1 and the second contact S2, the reference contact SO of the second control switch SW2 is controlled. ) Is not switched at either contact. On the contrary, when the second control switch SW2 operates in the same manner as the first control switch SW1 described above, the reference contact SO of the first control switch SW1 is not switched with any contact point.

When the first control switch SW1 and the second control switch SW2 are operated as described above, when the signal output from the hi-fi modulation / demodulation processing circuit 60 is applied to the first deck 1, The reference contact SO of the switch SW1 is switched to the first contact S1 and transferred to the first recording amplifier 20. The first recording amplifier 20 amplifies and outputs the audio signal to be applied at a predetermined amplification rate so as to be recorded on a recording medium (not shown).

On the other hand, when the signal output from the hi-fi modulation and demodulation processing circuit 60 is applied to the second deck 2, the reference contact SO of the second control switch SW2 is switched to the second contact S2 and the second contact point S2 is applied. It transfers to the recording amplifier 40. The second recording amplifier 40 processes the audio signal to be applied to the recording medium (not shown) in the same manner as the first recording amplifier 20 described above.

At the time of reproduction, when reproduced from the first deck 1, the first reproduction amplifier 10 amplifies the FM signal to be reproduced at a predetermined amplification rate and outputs it to the first switching means 80 and the second switching means 110. do. Here, since the description is made in the conventional manner, the case in which the second switching means 110 is applied will be described.

The signal applied to the second switching means 110 is applied to one side contact S1 of the third control switch SW2. The third control switch SW3 selectively switches the signals output from the first or second reproducing amplifiers 10 and 30 and outputs them to the hi-fi modulation / demodulation circuit 60. The switching operation of the third control switch SW3 is controlled by an output switching control signal output from a system controller (not shown). Currently, since it is output from the first reproducing amplifier 10, it is output to the hi-fi modulation / demodulation processing circuit 60 and applied to the output control means 70 via the demodulation section.

The output control means 70 selectively outputs to the next stage an RF converter (not shown) or an output jack connected to an external playback device. The playback device here is like a speaker.

On the other hand, when the audio signal is output from the second reproducing amplifier 30, the third control switch SW3 is switched to the second contact point S2 and output to the hi-fi modulation / demodulation processing circuit 60 to be processed in the same manner as described above. do.

Meanwhile, the FM dubbing of the audio signal in the double deck is performed as follows.

First, when the audio signal is to be dubbed from the first deck 1 to the second deck 2, the audio signal is output from the second reproduction amplifier 10. The output audio signal is applied to the second switching means 110 and the first switching means 80, respectively. On the contrary, the audio signal applied to the second switching means 110 is not applied to the hi-fi modulation / demodulation processing circuit 60 of the next stage because the third control switch SW3 is not operated. On the other hand, the first switching means 80 is for selectively outputting the audio signal applied from the first reproducing amplifier 10 and the signal output from the second reproducing amplifier 30. Currently, the first deck Since (1) is a reproduction mode, a signal output from the first reproduction amplifier 10 is selected and output.

When the audio signal is output from the first switching means 80, the switching noise removing means 90 outputs the audio signal from which the switching noise is removed by the gating pulse formed by the head switching pulse. That is, it will be described in more detail with reference to FIGS. 2 and 3.

First, when an audio signal output from the first reproduction amplifier 10 is applied, it is applied to the control switch 93 and the second delay circuit 92 of FIG. At this time, the control switch 93 is switched by a gating pulse formed by the head switching pulse, and selects one of an undelayed audio signal and a delayed audio signal and outputs it to the next level balance means 100. The gating pulses generated by the head switching pulses are applied to the first and second logical elements AND1 and AND2 and the power delay circuit 91 when the head switching pulses are applied as shown in Fig. 3A.

The first delay circuit 91 delays about 3H (horizontal scanning period) about the falling edge of the head switching pulse applied as shown in (A) of FIG. 3 and outputs it as shown in FIG. As a result, the first logical AND device AND1 performs an AND operation on the signal A of FIG. 3 and the signal inverted B of FIG. 3, and the second logical AND device AND2 inverts A of FIG. The resultant signal is logically multiplied by the signal shown in FIG. In this way, the outputs of the first and second logical elements AND1 and AND2 are logically summed at the logical sum element OR1 to output a gating pulse as shown in FIG.

The control switch 93 outputs the output signal of the second delay circuit 92 to the next level leveling means 100 in the section in which the gating pulse is high, and in the first reproducing amplifier 10 in the section in the low stage. The output audio signal is output to the level balancing means 100 of the next stage. In this way, the FM audio signal delayed by about 3H period is output from the edge and falling edges of the head switching pulse to maintain the output of the audio signal, thereby preventing noise generation due to switching switching.

The level balance means 100 adjusts and outputs the gain of the FM audio signal to have the same level as the demodulated, modulated, and recorded FM audio signal. Level balance means 100 may be composed of an amplifier and a buffer.

As such, the signal output from the level balance means 100 is applied to the second switching means 110. Since the current is a case of dubbing from the first deck 1 to the second deck 2, the second switching means 110 is activated by the signal applied through the input switching control signal input port. And the first control switch SW1 is in an inactive state, and the second control switch SW2 is controlled to be switched to the first contact point S1 to which the output signal of the level balance means 100 is applied. As a result, the FM audio signal through the second control switch SW2 of the second switching means 110 is recorded on the recording medium (not shown) of the second deck 2 through the second recording amplifier 40. .

On the other hand, the dubbing from the second deck 2 to the first deck 1 operates in the same manner as described above, but there is no audio signal output from the first reproducing amplifier 10 from the first switching means 80. In the second switching means 110, the second control switch SW2 is in an inactive state and the first control switch SW1 is in an active state. In particular, it is different that the first control switch SW1 is controlled to be switched to the second contact point S2 to which the signal output from the level balancing means 100 is applied. Accordingly, the FM audio signal output from the second reproducing amplifier 30 is output to the recording medium of the first deck 1 through the first recording amplifier 20. Therefore, the second switching means 110 serves as an FM dubbing control means.

As described above, the present invention enables the FM signal to be dubbed in a double-deck recording and reproducing system, thereby preventing noise mixing that may occur during dubbing due to modulation and demodulation, thereby improving the reproducibility of the audio signal, and providing a modulation / demodulation circuit system. By using only when the input and output to the outside of each deck is not equipped separately to use a separate change circuit is used to simplify the circuit and thereby has the advantage of lowering the price of the system.

Claims (4)

A hi-fi audio double deck recording / reproducing apparatus having a first deck (1) and a second deck (2); First selecting means (80) for selectively outputting audio signals reproduced from the first and second decks; Level balance means (100) for adjusting a level so that the audio signal output from the first selection means (80) is output at the same level as the signal subjected to modulation and demodulation; Controlling the output path of the audio signal to be recorded by applying the audio signal output from the level balancing means 100 to a deck which does not output the audio signal among the first deck 1 and the second deck 2; Hi-Fi audio double deck recording and reproducing apparatus characterized in that it comprises a second selection means (110) for. 2. The double deck recording and reproducing apparatus according to claim 1, wherein the double deck recording and reproducing apparatus removes the switching noise generated at the edge portion of the head switching with respect to the audio signal output from the first selecting means (80) and outputs it to the level balancing means. Hi-Fi audio double deck recording and reproducing apparatus characterized by further comprising a noise removing means (90). A hi-fi audio double deck recording / reproducing apparatus having a first deck (1) and a second deck (2); Control means (110) for controlling FM dubbing to a deck which does not output from any one of the first deck (1) and the second deck (2) outputting an audio signal; If the signal to be reproduced from either the first deck 1 or the second deck 2 is to be output to an external playback device without the FM dubbing, the demodulated signal is output by demodulating the external audio. Hi-Fi audio, characterized in that it comprises a hi-fi modulation and demodulation processing circuit 70 for outputting to any one of the first deck (1) and the second deck (2) when the signal to be output from the playback device to record Double deck recording and playback device. 4. The control unit (110) according to claim 3, wherein the control means (110) is an audio between any one of the first deck (1) and the second deck (2) and the hi-fi modulation and demodulation processing circuit (70) when not in the FM dubbing mode. Hi-Fi audio double deck recording and reproducing apparatus characterized by controlling the transmission of the signal.