JP3389586B2 - Recording and playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording and reproducing apparatus, and more particularly to a recording and reproducing apparatus having a dubbing function. 2. Description of the Related Art As a recording / reproducing apparatus having a dubbing function, there is a recording / reproducing apparatus known as a so-called double cassette tape recorder. This recording / reproducing apparatus includes two mechanism units capable of loading two recording media at the same time, and directly reproduces a reproduction signal obtained by reproducing one cassette tape loaded in one mechanism unit without passing through an external signal line. Can be recorded on another cassette tape loaded in the mechanism section. In this case, there is a type in which two mechanisms are used for both recording and reproduction, or a type in which one of the mechanisms is used exclusively for reproduction. In such a recording / reproducing apparatus, at the time of dubbing, a signal obtained by reproducing one cassette tape by a head of one of the mechanical units is amplified by a reproducing equalizer amplifier, and then a noise reduction circuit operating in a reproducing mode is used. The noise is reduced, output, amplified by a recording equalizer amplifier, equalized, and recorded on another cassette tape by the head of another mechanism. Also, at the time of normal recording, the signal input from the external input terminal is subjected to noise reduction processing by the noise reduction circuit that operates in the recording mode, and output.
As in the case of dubbing, the sound is recorded on the cassette tape by the head of the mechanism. In a recording / reproducing apparatus, a right channel core 103 and a left channel core 104 are mounted on a front surface of a head body 101 with a spacer 102 interposed therebetween, as shown in FIG. The dimensional tolerances of the dimensional accuracy and mounting accuracy of the cores 103 and 104 of the head main body 101 and the mounting accuracy of the tape guides 105 and 105 are recognized. Therefore, when adjusting the reproduction signal level using the reference signal test tape ST recorded on the full track as shown in FIG. 4 at the factory shipment stage, the cores 103 and 104 of the head body 101 are adjusted. Even if the mechanical position slightly varies, it does not deviate from the signal recording pattern of the test tape. On the other hand, in the normal use stage, as shown in FIG.
An inevitable shift occurs between R, TL and the cores 103, 104 (gap) of the head body 101, and the reproduction level is reduced by the shift. However, in the above-described conventional recording / reproducing apparatus having the dubbing function, the occurrence of the deviation is ignored in the dubbing on the premise that the core positions of the heads of the respective mechanisms coincide. When the core position of the head is shifted, it becomes impossible to record at the same level as the original tape. In this case, when the noise reduction circuit is not operating, no serious harm is developed, but when the noise reduction circuit is operating, there is a problem that normal operation cannot be performed. [0007] In order to solve the above-mentioned problems, a recording / reproducing apparatus according to the present invention is capable of loading one recording medium.
, A first mechanism having at least a reproducing function
And another recording medium can be loaded, and at least
A recording / reproducing apparatus including a second mechanism having a sound function , wherein the one recording medium loaded in the first mechanism is
The first mechanism is operated in a reproduction mode when reproducing.
Performs a noise reduction process on the reproduced signal from the
External input terminal to another recording medium loaded in the mechanism of
It works in the recording mode when recording the input signal from
The first and second steps for performing noise reduction processing on the input signal.
And one common noise reduction for the second mechanism
The reproduction signal from the first mechanism unit and the reproduction signal from the first mechanism unit.
The noise reduction without supplying the noise reduction
Normal playback means that outputs to an external output terminal via a
And reproducing the reproduced signal from the first mechanism section with the noise
Supply to the second mechanism section via a reduction circuit.
With this, the reproduction signal from the first mechanism section is transmitted to the other
Dubbing means for dubbing to one recording medium;
Between the mechanism and the noise reduction circuit,
Between the noise reduction circuit and the second mechanism
Provided in at least one of the first mechanism and the
The reproduced signal supplied to the noise reduction circuit;
From the noise reduction circuit to the second mechanism
Signal level of at least one of the supplied reproduced signals.
More than the normal playback by the normal playback means.
Which is configured by providing the level switching means for switching to high during dubbing by Bing means. By duplicating the level of at least one of the reproduction signal and the recording signal during dubbing so as to be higher than that during normal reproduction or recording, the reproduction level during dubbing rises and dubbing occurs. This can prevent the level from the original recording medium from dropping and the malfunction of the noise reduction circuit due to this. Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram of a recording / reproducing apparatus according to the present invention, and FIG. 2 is a detailed view of a main part of FIG. This recording / reproducing apparatus includes two first and second mechanism sections 1 and 2 each capable of loading a cassette tape as a recording medium, wherein the first mechanism section 1 is dedicated to reproduction and the second mechanism section 2 is provided. Are used for reproduction and recording. These first and second mechanism units 1 and 2 respectively include heads 3 and 4, reel shafts 5 and 6, capstans 7 and 8, and pinch rollers 9 and 1.
0 and so on. A reproduction signal reproduced by the head 3 of the first mechanism 1 is passed through a reproduction equalizer amplifier circuit 11, a level switching circuit 12 as a level switching means, and a reproduction signal switching switch 13 to a noise reduction circuit (NR).
The reproduction signal input to the reproduction signal input terminal PBIN 14 and reproduced by the head 4 of the second mechanism section 2 is transmitted through the recording / reproduction switch 15, the reproduction equalizer amplifier circuit 16, and the noise reduction through the reproduction signal change switch 13. Circuit 1
4 is input to the reproduction signal input terminal PBIN. As shown in FIG. 2, a reproduction equalizer amplifier circuit 11 includes an amplifier A1, capacitors C1 to C3, and a resistor R.
1, R2 and a semi-fixed resistor VR1. The semi-fixed resistor VR1 is used to adjust so as to obtain a predetermined reproduction level when reproducing the reference signal test tape, and is used to absorb variations in head reproduction sensitivity and variations in amplifier gain. Adjusted at the factory. Note that the reproduction equalizer amplifier circuit 16 has the same configuration. The level switching circuit 12 is for switching the level of a reproduction signal output from the reproduction equalizer amplifier circuit 11 between normal reproduction and dubbing as shown in FIG. It comprises a series circuit of two input distribution resistors R3 and R4, and a changeover switch SW1 having a contact a connected between the distribution resistors R3 and R4, a contact b connected to the input side of the distribution resistor R3, and a common contact c. The switch SW1 is switched to the contact a during normal reproduction and to the contact b during dubbing. The changeover switch SW1 can perform manual switching or automatic switching control by detecting that dubbing is instructed. On the other hand, a recording signal output from a recording signal output terminal RECOUT of the noise reduction circuit 14 is input to a recording equalizer amplifier circuit 18 via a semi-fixed resistor VR2 and a recording mute circuit 17, and is supplied to a bias erasing oscillator circuit 19. The bias current is superimposed and supplied to the head 4 via the recording / reproduction switch 15. The recording equalizer amplifier circuit 18 includes an amplifier A2, an equalizer EQ, and a capacitor C as shown in FIG.
4, resistors R5 and R6. The semi-fixed resistor VR2 at the preceding stage of the recording equalizer amplifier circuit 18 is adjusted so that a predetermined reproduction level can be obtained when a reference recording signal is recorded at a reference level on a blank tape as a reference of a tape recorder. This is used to absorb variations in the recording level of the head and variations in the gain of the amplifier, and is adjusted at the factory shipment stage. FIG. 2 omits illustration of the recording mute circuit 17 of FIG. The bias erasing oscillation circuit 19 is composed of a parallel circuit of a bias oscillator 20, a coil L1, and a capacitor C5, and supplies a bias current to a recording head and an erasing current to an erasing head. An external input LINEIN is input to a recording signal input terminal RECIN of the noise reduction circuit 14 via an external input terminal LI via a variable resistor VR3, and from a line output terminal LINEOUT via a mute circuit 22, As shown in FIG. 2, a headphone terminal 24 is amplified by a head amplifier circuit 23 including an amplifier A3 and resistors R8 and R9.
And output to the level meter 26 via the rectifier circuit 25 and further directly to the external output terminal LO. The recording / reproducing apparatus further comprises a system controller 28 comprising a microcomputer for controlling the entire apparatus.
8 controls the mechanism drive circuit 30 based on the detection results of various detectors provided in the operation unit 29 and the first and second mechanism units 1 and 2, and controls the mechanism of the first and second mechanism units 1 and 2; In addition to controlling the operation of an actuator, a reel motor, a capstan motor, and the like for operation, switching the operation mode of the noise reduction circuit 14, switching control of the reproduction signal changeover switch 13, recording / reproduction changeover switch 15, and bias erase oscillation Various controls such as control of the circuit 19 and display control of the display unit 31 are performed. When the switch SW1 of the level switching circuit 12 is automatically switched, the switching is controlled by a switching signal from the system controller 28. The operation of the recording / reproducing apparatus configured as described above will be described. (1) In the case of single reproduction by the first mechanism unit 1 When a reproduction command signal of the first mechanism unit 1 is input from the operation unit 29, the system controller 28 outputs a drive signal to the mechanism drive circuit 30, and First mechanism 1
The first mechanism 1 is moved to the reproducing state, that is, the head 3 is moved to the reproducing position, the capstan motor is rotated at a constant speed, and the pinch rollers 9 and 10 are moved to the capstans 7 and 8 while monitoring the mechanism monitor signal from. The reel motor is rotated in the reproduction mode, the reproduction signal changeover switch 13 is switched to the first mechanism 1 side, the noise reduction circuit 14 is controlled to the reproduction mode, and the mute circuit 22 to the external output terminal LO is connected. To release. As a result, a signal reproduced by the head 3 from the tape loaded in the first mechanism section 1 is amplified by the reproduction equalizer amplifier circuit 11, and a level switching circuit 12 (this operation will be described later) and a reproduction signal switching switch 13, is input to a reproduction signal input terminal PBIN of the noise reduction circuit 14, is output from a line output terminal LINEOUT of the noise reduction circuit 14 to a speaker or the like through an external output terminal LO, and is connected to a headphone terminal 24 and a level meter 2.
6 is also output. (2) In the case of single reproduction by the second mechanism section 2 When a reproduction command signal of the second mechanism section 2 is inputted from the operation section 29, the system controller 28 outputs a drive signal to the mechanism drive circuit 30. And the second mechanism 2
The second mechanism unit 2 is set to the above-described playback state while monitoring the mechanism monitor signal from the CPU, the recording / playback switch 15 is switched to the playback side, and the playback signal switch 13 is set to the second mechanism unit 2 side. Switching and controlling the noise reduction circuit 14 to the reproduction mode. As a result, a signal obtained by reproducing the tape loaded in the second mechanism unit 2 by the head 4 is input to a reproduction equalizer amplifier circuit 16 via a recording / reproduction switch 15 and amplified, and the reproduction signal change switch 13 is turned on. The signal is input to the reproduction signal input terminal PBIN of the noise reduction circuit 14 via the line output terminal LINEOUT of the noise reduction circuit 14 to the speaker or the like through the external output terminal LO in the same manner as described above. Is also output. (3) In the case of single recording by the second mechanism section 2 When a recording command signal of the second mechanism section 2 is input from the operation section 29, the system controller 28 outputs a drive signal to the mechanism drive circuit 30. And the second mechanism 2
While monitoring the mechanism monitor signal from, the second mechanism section 2 is in the recording state, that is, the head 4 is moved to the recording position, the capstan motor is rotated at a constant speed, and the pinch rollers 9 and 10 are moved to the capstans 7 and 8. The reel motor is rotated in the recording mode by pressing, and the recording / playback switch 15 is switched to the recording side.
4 is set to the recording mode, the bias erasing oscillation circuit 19 is operated, and the recording mute circuit 17 is released. Thus, the input signal input to the external input terminal LI is input to the recording signal input terminal RECIN of the noise reduction circuit 14, and the noise reduction circuit 1
Recorded signal output terminal RECO encoded in 4
The signal is input from the UT to the recording equalizer amplifier circuit 18, amplified, and recorded by the head 4 on the tape loaded in the second mechanism 2. (4) In the case of dubbing In this case, the first mechanism section 1 is set to the above-described reproduction state, the second mechanism section 2 is set to the recording state, and the reproduction signal changeover switch 13 is set to the first mechanism section. The recording / reproduction switch 15 is switched to the recording side. As a result, a signal reproduced from the tape loaded in the first mechanism unit 1 by the head 3 is amplified by the reproduction equalizer amplifier circuit 11, and is amplified via the level switching circuit 12 (this operation will be described later) and the reproduction signal switch 13. is input to the reproduced signal input terminal PBIN noise reduction circuit 14 Te, noise reduction circuit 14 outputs a reproduction signal input to the reproduced signal input terminal PBIN from recording <br/> sound signal output terminal RECOUT, recording equalizer amplifier circuit The recording is amplified by 18 and recorded on the tape loaded in the second mechanism unit 2 by the head 4. The operation of the level switching circuit 12 will now be described. At the time of normal reproduction, the changeover switch SW1 is switched to the contact a as described above, so that the reproduction signal input to the noise reduction circuit 14 at this time is The level depends on the level between both ends of the voltage dividing resistor R4. On the other hand, at the time of dubbing, the changeover switch S
Since W1 is switched to the contact b side as described above, the level of the reproduced signal input to the noise reduction circuit 14 at this time is in accordance with the level between both ends of the series circuit of the voltage dividing resistors R3 and R4. . Therefore, during dubbing, the level of the reproduced signal is higher than during normal reproduction. As a result, at the time of dubbing, the level of the reproduced signal is increased so as to compensate for the decrease in the reproduced level caused by the mismatch between the core position (gap position) of the recording head and the reproducing head. , And the malfunction of the noise reduction circuit 14 is also prevented. At this time, since the decrease in the reproduction level is about 1 dB on average, it is preferable to set the level to be corrected to about 1 dB. In the above embodiment, the level of the reproduction signal is switched by the level switching means. However, the level of the recording signal or both of them may be switched. For example, when the level of the recording signal is switched, the level switching circuit 12 of the above embodiment may be provided at the subsequent stage of the recording signal output terminal RECOUT of the noise reduction circuit 14. Further, the semi-fixed resistors VR1 and VR2 of the above embodiment may be constituted by an electronic volume, and these may be switched between normal reproduction and dubbing. Furthermore, the first and second mechanism units may be dedicated to reproduction and recording only, and both may have reproduction and recording functions. Furthermore, the present invention can be applied to a recording / reproducing apparatus using a magnetic recording medium other than a cassette tape. As described above, according to the present invention, at the time of dubbing, the signal level of at least one of the reproduction signal and the recording signal is increased by the level switching means as compared with the normal reproduction or recording. By switching, the reproduction level at the time of dubbing rises, and it is possible to prevent a level drop from the original recording medium due to dubbing and a malfunction of the noise reduction circuit accompanying the dubbing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a recording / reproducing apparatus according to the present invention; FIG. 2 is a detailed view of a main part of FIG. 1; FIG. FIG. 5 is an explanatory diagram showing the relationship between the tape and the head. FIG. 5 is an explanatory diagram showing the relationship between the track and the head of the recording tape. [Description of References] 1. First mechanical unit, 2. Second mechanical unit, 3, 4,. Head, 1
DESCRIPTION OF SYMBOLS 1 ... Reproduction equalizer amplifier circuit, 12 ... Level change circuit, 13 ... Reproduction signal change switch, 14 ... Noise reduction circuit, 18 ... Recording equalizer amplifier circuit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 5/027 G11B 20/00-20/04 G11B 15/02 373

Claims (1)

(57) [Claims] [Claim 1] At least one recording medium can be loaded.
Mechanism having a reproducing function and another recording medium
And at least a second having a recording function
In the recording and reproducing apparatus having a mechanism to reproduce the one recording medium loaded in the first mechanism portion
At the time of operation in the regeneration mode, and restarts from the first mechanism.
Performing a noise reduction process on the raw signal;
Input from the external input terminal to another recording medium
Operate in record mode when recording force signal
The first and second signals for subjecting the signal to noise reduction processing;
One noise reduction circuit common to the mechanism
And reproducing the reproduced signal from the first mechanism section with the second mechanism section.
Without passing through the noise reduction circuit.
Normal reproduction means for outputting the signal to an external output terminal, and a reproduction signal from the first mechanism section to the noise reduction circuit.
Supply to the second mechanism unit via an application circuit.
Thus, the reproduction signal from the first mechanism unit is
Dubbing means for dubbing on a recording medium, between the first mechanism unit and the noise reduction circuit;
And the noise reduction circuit and the second mechanism
And the first mechanism unit is provided in at least one of
The signal supplied to the noise reduction circuit from the
From the raw signal and the noise reduction circuit, the second device
At least one of the reproduced signal supplied to the structural unit
The signal level from the time of normal reproduction by the normal reproduction means.
A recording / reproducing apparatus, further comprising a level switching means for switching the level to a high level at the time of dubbing by the dubbing means .