JPH0294105A - Tape recording and reproducing device of helical scan system - Google Patents

Abstract

PURPOSE:To provide the recording and reproducing device which is simplified in constitution and is economically advantageous by commonly using a rotary drum and head and subjecting plural tapes respectively independently to recording and reproducing. CONSTITUTION:A drum motor 78 for rotationally driving, for example, the rotary drum is controlled in the rotating direction by a drum servo circuit 79. The drum servo circuit 79 is supplied via an amplifier 80 under the control of a system controller 71. The rotation of the drum motor 79 is controlled in accordance with the information on the rotating speed of the rotary drum and the information on the head position from a sensor 81. The tape with which the head 56 is brought into contact is discriminated and the switching of switches 76, 77 is executed via the amplifier 80 in accordance with the information on the rotating speed of the rotary drum and the information on the head position from a sensor 81. The plural tapes are respectively independently subjected to recording and reproducing in such a manner by using the same rotary drum and the head. The device which is simplified in constitution and is economically advantageous is obtd. in this way.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a helical scan type tape recording and reproducing device, such as a rotary head type digital audio tape recorder, and in particular, to It relates to a tape that can be recorded and played back simultaneously.

(Prior Art) As is well known, in the field of audio equipment, in order to record and reproduce information with as high density and high fidelity as possible, PCM (Pulse Code Modulation) technology is used to process information signals such as audio signals. Digital recording and reproducing systems that convert data into digitized data, record it on a recording medium, and reproduce it are becoming popular.

Among these, those that use magnetic tape as a recording medium are called digital audio tape recorders.
For example, there is a fixed head type in which multiple heads are arranged in the width direction of the tape, and a helical scan in which the tape is wound around a cylindrical drum in which the head rotates along the circumference. There is also a rotating head type that does this.

Here, FIG. 3 shows a conventional rotary head type digital audio recorder. In other words, I in the figure
I is a digital audio tape cassette in which a digital audio tape 14 whose both ends are wound around a pair of reel hubs 1213 is accommodated.

This tape cassette 11 has its reel hub 12゜13.
is a pair of reel stands 1[i,
17, and are fitted to each other. The tape 14 is run by rotating these reel stands IO, 17 in predetermined directions by reel motors (not shown), and during recording and reproduction, the tape 14 is run from the reel hub 12 side to the reel hub 13 side. It is designed so that

Here, the main chassis 15 includes a rotating drum 18. which is formed in a cylindrical shape. Capstan 19. A pinch roller 20, a plurality of tape guide rollers 21, tape guide pins 22, etc. are arranged. Of these, a pair of recording and reproducing heads 23 and 24 are supported on the rotating drum 18 so as to face outward from each other with the rotation center thereof in between. and,
The rotating drum 18 is rotated counterclockwise in the figure by a drum motor, which will be described later.

Further, the capstan 19 serves as a rotation axis of the flywheel 25, and is rotated counterclockwise in the figure at a constant rotation speed by a capstan motor (not shown). Further, a pinch roller 2o is brought into contact with and separated from the capstan 19.

During recording and reproduction, the tape 14 is pulled out from within the tape cassette 11, supported by each tape guide roller 21, tape guide pin 22, etc., and brought into contact with the circumferential surface of the rotating drum 18, as shown in the figure. Become. In this case, the tape 14 is 90° from the center of rotation of the rotating drum 18.
Within the range of the opening angle, the wire is obliquely wound around the circumferential surface of the rotating drum 18 with a certain inclination.

Further, at this time, the pinch roller 20 is pressed against the capstan 19 via the tape 14, so that the tape 14 is run at a constant speed. Therefore, on the tape 4, tracks corresponding to the head 23 and tracks corresponding to the head 24 are alternately formed with a constant slope.

In this case, the head 23 is supported by the rotating drum 18 at an azimuth angle of +20° with respect to the track forming direction, and the head 24 is supported by the rotating drum 18 at an azimuth angle of -20° with respect to the track forming direction. is supported by

Next, with the tape 14 loaded as described above, the recording/reproducing operation for the tape 14 will be described with reference to FIG. 4. First, during recording, digital data obtained by digitizing an audio signal is supplied to the input/output terminal 26. This digital data is supplied to a signal processing circuit 27, and various control data, error correction data, etc. are added thereto under the control of a system controller 28 incorporating, for example, a microcomputer.

The digital data output from the FI non-processing circuit 27 is then transferred to an equalizer circuit 29 having a PLL (phase locked loop) circuit configuration. Via the amplifier 30 and switch 31,
The heads 23, 24 are selectively fed. In this case, the switch 31 connects the output from the rotary transformer (not shown) which rotates together with the rotating drum 18 to the amplifier 30 during the period when the head 23 is in contact with the tape 14.
The output of the amplifier 30 is switched to the head 23 while the head 24 is in contact with the tape 14, and the output of the amplifier 30 is switched to the head 24. will be carried out.

Here, the rotation state of the drum motor 32 for rotationally driving the rotary tram 18 is controlled by a drum servo circuit 33. This drum servo circuit 8
3 controls the rotation of the drum motor 32 based on the rotational speed information and head position information of the rotating drum 18 from the sensor 35, which are supplied via the amplifier 34 under the control of the system controller 28. be.

Further, a capstan motor 36 for rotationally driving the capstan 19 is connected to a capstan servo circuit 37.
The rotation state is controlled by. This capstan servo circuit 37 is connected to the system controller I/roller 28
capstan 1 obtained from sensor 38 under the control of
A signal obtained by passing a frequency signal corresponding to the rotation speed of No. 9 through an AFC (automatic frequency control) circuit 39, a tracking error signal output from an ATF (automatic track finding) circuit 40, and an APC (automatic phase control) signal. ) Based on the output signal of the circuit 41, the rotational speed of the capstan motor 36 and thus the running speed of the tape 14 are controlled.

Next, during reproduction, the reproduced signals obtained from each head 23 and 24 are selectively guided to the amplifier 30 by the switch 31, and then passed through the equalizer circuit 29 to the signal processing circuit 27.
is supplied to In this case, the switch 31 is changed so as to lead the output of the head 23 to the amplifier 30 while the head 23 is in contact with the tape I4, as in the case of recording; During this period, the output of the head 24 is switched to the amplifier 30.

Here, in the signal processing circuit 27, separation of various control data, error correction processing, etc. are performed under the control of the system controller 28, and only the digital data of the audio component is transmitted via the input/output terminal 26 (not shown). The signal is supplied to a digital-to-analog conversion circuit or the like, where the tape 14 is reproduced. Even in this reproducing state, the rotating drum 18
The rotational state of the capstan 19 is controlled in the same manner as during recording.

By the way, in recent years, digital audio tape recorders such as those mentioned above have been equipped with two tape cassettes and each tape can be recorded and played back independently, thereby making it possible to simultaneously record on two tapes. It is being considered to increase the number of functions by adding functions such as a function to put one tape in a playback state and the other tape in a recording state at the same time.

However, in order to achieve such multi-functionality, two recording and reproducing systems with the configuration shown in Figure 3 must be placed in the same cabinet, which leads to an increase in the size of the configuration and is not economically viable. The problem arises that it is not suitable for practical use.

(Problem to be Solved by the Invention) As described above, in order to realize the function of independently recording and reproducing two tapes, it is necessary to arrange two recording and reproducing systems with the same configuration in the same cabinet. What you have is a problem of not being practical.

Therefore, the present invention has been made in consideration of the above circumstances, and is an extremely favorable helical scan method that can independently record and play back to multiple tapes with a simple configuration and is economically advantageous. The object of the present invention is to provide a tape recording and reproducing apparatus for the following purposes.

[Structure of the Invention (Means for Solving the Problems) A helical scan type cheap recording and reproducing device according to the present invention includes a rotating drum, a rotating drum provided on the circumferential side of the rotating drum, and a first azimuth angle set at a first azimuth angle. A first recording/reproducing section set at a second azimuth angle and a second recording/reproducing section set at a second azimuth angle are integrated into a head, and are arranged on the circumferential side of the rotating drum from the center of rotation of the rotating drum. loading means for bringing the first and second tapes into contact in a substantially equal opening angle range and facing each other across the center of rotation; a detection means for obtaining a signal corresponding to the rotational position of the rotating drum; Based on the signal obtained from the detection means, the signal to be recorded on the first tape is alternately guided to the first and second recording/reproducing sections each time the head traces the first tape;
Helical tracks corresponding to first and second azimuth angles are alternately formed and recorded on the first tape, and signals to be recorded on the second tape are recorded each time the head traces the second tape. a recording means for alternately guiding the recording medium to a first and second recording/reproducing section to alternately form and record helical tracks corresponding to the first and second azimuth angles on the second tape; and a detecting means. Based on the signals, each time the head traces the first tape, the playback signals from the first and second recording/playback sections are alternately derived, and the first and second signals formed alternately on the first tape are The helical track corresponding to the azimuth angle of and reproducing means for reproducing helical tracks corresponding to the first and second azimuth angles formed in the first and second azimuth angles.

(Function) According to the above configuration, recording and reproduction can be performed independently on the first and second tapes using the same rotating drum and head, and the configuration is simple and economical. It can be used to your advantage.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. In FIG. 1, 42 is a digital audio tape cassette, inside which there is a pair of adhesives at both ends.
A digital audio tape 45 wound around the hubs 43 and 44 is housed.

This tape cassette 42 has its reel hub 43°44
A pair of reel stands 47.4 are rotatably supported by the main chassis 46 of the digital audio tape recorder.
8, and are fitted to each other. These reel stands 47 and 48 are rotated in predetermined directions by reel motors (not shown) to run the tape 45. During recording and playback, the tape 45 is rotated from the reel hub 43 side to the reel hub 44 side. It is designed to be driven.

On the other hand, numeral 49 in the figure is another digital audio tape cassette, inside which there is a pair of reel hubs 50.5 at both ends.
A digital audio tape 52 wound around 1 is housed therein. This tape cassette 49 has its reel hub 5
0.51 are fitted to a pair of reel stands 53 and 54 rotatably supported by the main chassis 46, respectively. And these reel stands 53.5
4 is rotated in a predetermined direction by a reel motor (not shown) to run the tape 52, and during recording and playback, the tape 52 is rotated from the reel hub 50 side to the reel hub 5.
A tape 52 is run on the first side.

Here, in the main chassis 46, a cylindrical rotating drum 55 is arranged between the tape cassettes 42 and 49. A recording/reproducing head 56 is supported outwardly on the circumferential surface of the rotating drum 55. The head 56 is configured by integrally comprising a first recording/reproducing section set at a positive azimuth angle and a second recording/reproducing section set at a negative azimuth angle. Further, the rotating drum 55 is rotated counterclockwise in the figure by a drum motor to be described later.

Further, in the main chassis 46, a capstan 57 is provided near the tape cassette 42. Pinch roller 58, multiple tape guide rollers 59, and tape guide pins 6
0 etc. are arranged. Of these, the capstan 57 is the rotational axis of the flywheel 61, and is operated by a geared bustan motor that does not R in the figure.
, )) is rotated at a constant rotational speed. A pinch roller 58 is brought into contact with and separated from the capstan 57.

The main palm 46 also includes a tape cassette 4.
9, a capstan 62. A pinch roller 63, a plurality of tape guide rollers 64, and a tape guide bin 65
Chika is placed. Among these, the capstan 62 is
This is the rotation axis of the flywheel 66, and is rotated counterclockwise in the figure at a constant rotational speed by a gear bus stan motor (not shown). Further, a pinch roller 63 is adapted to move toward and away from the capstan 62.

First, when recording and reproducing the tape 45, the tape 45 is pulled out from the tape cassette 42 as shown in the figure, and each tape guide roller 59 and tape guide pin 60
etc., and comes into contact with the circumferential side of the rotating drum 55. In this case, the tape 45 is
Winding E 1 obliquely within an opening angle of 90° from the center of rotation and with a certain inclination on the circumferential surface of the rotating drum 55.
I get kicked. Also, at this time, the pinch roller 58 is pressed against the capstan 57 via the tape 45, and the tape 45
will now run at a constant speed.

On the other hand, when recording and playing back the tape 52, the tape 52 is pulled out from the tape cassette 49, supported by each tape guide roller 64, tape guide pin 65, etc., and brought into contact with the circumferential side of the rotating drum 55, as shown in the figure. Become so. In this case, the tape 52 is wound diagonally (=1) within a range of an opening angle of 90° from the center of rotation of the rotating drum 55 and with a certain inclination on the circumferential surface of the rotating drum 55. The vinyl roller 63 is pressed against the capstan 62 via the tape 52, and the tape 52 is run at a constant speed.

In this case, when recording and reproducing the tape 45, 52, as shown in the figure, the tape is placed on the circumferential side of the rotating drum 55 within an opening angle of 90° from the center of rotation of the rotating drum 55, and facing the center of rotation across the center of rotation. Since the tapes 4552 are brought into contact in such a manner that the tapes 45, 52 are not brought into contact with each other.

With one tape 4552 loaded (above), recording and reproducing operations for the tape 45 and 52 will now be described with reference to FIG.

First, when recording onto the tape 45.52, digital data obtained by digitizing the audio signal is transferred to the input/output terminal 81.
[fJ (is supplied to each i8. This digital button is supplied to a signal processing circuit 6970, and under the control of a system controller 71 that includes a built-in microcomputer, etc., various control data, error termination data, etc. is added.

Each digital data output from the signal processing circuit [i9.70 is processed by an equalizer circuit 72 having a PLL circuit configuration.
．． 73, the first and second recordings (1) of the head 56 via amplifiers 74, 75 and switches 76, 77, respectively.
It is selectively supplied to the live parts 58a and 5Gb.

In this case, the switches 76 and 77 are connected to one of the amplifiers described later.
(Accordingly, each time the head 5G comes into contact with the tape 45, the output of the amplifier 74 is switched to be alternately guided to the first and second recording pre-recording sections 56a and 5[ib. Amplifier 7 each time 56 is contacted with tape 52
5 output to the first and second recording +1 raw section 513a,
5[).

Therefore, the tape 45 contains the first recording +1 raw portion 56a.
A helical track by the input/output terminal 67 and a helical track by the second recording/reproducing section 561+ are alternately formed, and digital data supplied to the input/output terminal 67 is recorded. Also,
Also on the tape 52, helical tracks formed by the first recording/reproducing section 5 [ia] and helical tracks formed by the second recording/reproducing section 5Bb are alternately formed, and the dental data supplied to the input/output terminal 68 is recorded thereon. Simultaneous recording is performed on two tapes 45 and 52.

Here, the rotational state of the drum motor 78 for rotationally driving the rotary drum 55 is controlled by a drum servo circuit 79. This drum servo circuit 7
9 controls the rotation of the drum motor 78 based on the rotational speed information of the rotary tram 55 from the sensor 81 and the position information supplied via the amplifier 80 to the system controller 71. It is something.

Then, based on the rotational speed information of the rotating drum 55 and the head position information obtained from the sensor 81, the tape 45, 52 that the head 56 contacts is determined, and the switches 76 and 77 are switched via the amplifier 80. It is something that can be done.

Further, the rotation state of the capstan motor 82 for rotationally driving the capstan 57 is controlled by a capstan servo circuit 83. The capstan servo circuit 83 receives, under the control of the system controller 71 , a frequency signal obtained from a sensor 84 and passed through an AFC circuit 85 that corresponds to the rotational speed of the capstan 57 , and a signal that is output from an ATF circuit 86 . Based on the tracking error signal and the output signal of the APC circuit 87, the rotational speed of the capstan motor 82 and thus the tape 4
5's running speed is controlled.

Further, a capstan motor 88 for rotationally driving the capstan 62 is connected to a capstan water circuit 89.
The rotation state is controlled by. This capstan servo circuit 89 is configured to control the capstan 62 obtained from the sensor 90 under the control of the system controller 71.
The rotational speed of the capstan motor 88 and the tape are determined based on a frequency signal corresponding to the rotational speed of the capstan motor 88 passed through the AFC circuit 91, a tracking error signal output from the ATF circuit 92, and an output signal of the APC circuit 93. 52's running speed is controlled.

Next, when playing back the tape 45 and recording on the tape 52, each time the head 56 traces the tape 45, the switches 76 and 77 control the playback signals from the first and second recording/playback sections 5Ba and 56b. The signals are alternately derived and guided to an amplifier 74 and supplied to a signal processing circuit 69 via an equalizer circuit 72.

Here, in the signal processing circuit 69, under the control of the system controller 71, separation of various control data, error correction processing, etc. are performed, and only the digital data of the audio component is transmitted via the input/output terminal 67 (not shown). The signal is supplied to a digital-to-analog conversion circuit or the like, where the tape 45 is reproduced. Even in this reproducing state, the rotating drum 55
The rotational state of the capstan 57 is controlled in the same manner as during recording.

Further, since the recording operation on the tape 52 can be explained in the same manner as described above, the explanation thereof will be omitted.

Furthermore, when playing back the tape 52 and recording on the tape 45, each time the head 56 traces the tape 52, the switches 70 and 77 alternately switch the playback signals from the first and second recording/playback sections 5Ga and 56b. By leading the signal to the amplifier 75, the tape 52 can be reproduced. Further, the recording operation on the tape 45 can be explained in the same manner as described above.

Therefore, according to the configuration of the above embodiment, since the rotary drum 55 and the head 56 are commonly used for the two tapes 45 and 52, the configuration is simplified and economically advantageous. be able to.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to independently record and reproduce data on a plurality of tapes with a simple configuration, and to achieve an extremely good helical scan that can be economically advantageous. It is possible to provide a tape recording and reproducing device based on the above-mentioned method.

[Brief explanation of the drawing]

1 and 2 are respectively a plan view showing an embodiment of a helical scan type tape recording/reproducing apparatus according to the present invention and a block configuration diagram showing its control means, and FIGS. FIG. 1 is a plan view showing a tape recording/reproducing device and a block configuration diagram showing its control means. 11...Tape cassette, 12.13...Reel hub, 14...Tape, 15...Main chassis, l
[i, 17... Lil stand, 18... Rotating drum, 1
9... Capstan, 20... Pinch roller, 21
... Tape guide roller, 22 ... Tape guide pin, 23.24 ... Head, 25 ... Flywheel, 26 ... Input/output terminal, 27 ... Signal processing circuit, 28
...System controller, 29...Equalizer circuit, 30...Amplifier, 31...Switch, 32...
・Drum motor, 33...Drum motor circuit, 34・
...Amplifier, 35...Sensor, 36...Capstan motor, 37...Capstan servo circuit, 38...
Sensor, 39...AFC circuit, 40...ATF circuit, 41...APC circuit, 42...tape cassette,
43.44...Reel hub, 45...Tape, 4G
... Main palm, 47.48 ... Reel stand, 4
9...Tape cassette, 50.51...Reel hub, 52...Tape, 53.54...Reel stand, 55...
...Rotating drum, 56...Head, 57...Capstan, 58...Pinch curler, 59...Tape guide roller, 60...Tape guide pin, 61...Flywheel, 62...・Capstan, 63・ Pinch roller, 64...Tape guide roller, 65...
Tape guide pin, 66...Flywheel, 67,
B111...Input/output terminal, 69°70...Signal processing circuit, 7]...System controller, 72, 73
... Equalizer circuit, 74.75・Amplifier, 7G. 77...Switch, 78...Drum motor, 79...
Drum servo circuit, 80...Amplifier, 81...Sensor, 82...Capstan motor, 83...Capstan servo circuit, 84...Sensor, 85...AFC circuit, 86...ATF circuit, 87・APC circuit, 88・
Capstan motor, 89... Cabstan servo circuit, 90... Sen→J-191... AFC circuit, 92...
...ATF circuit, 93...APC circuit.

Claims (1)

[Claims] A rotating drum; a first recording/reproducing section provided on the circumferential side of the rotating drum and set at a first azimuth angle; and a second recording section set at a second azimuth angle. a reproducing unit, a head integrally configured, and a peripheral side of the rotating drum, in a range of approximately equal opening angles from the center of rotation of the rotating drum, and facing the center of rotation across the center of rotation; loading means for bringing the first and second tapes into contact; a detection means for obtaining a signal corresponding to the rotational position of the rotating drum; and a signal to be recorded on the first tape based on the signal obtained from the detection means. A signal is alternately guided to the first and second recording/reproducing sections each time the head traces the first tape, and a helical track corresponding to the first and second azimuth angles is formed on the first tape. are alternately formed and recorded, and the signal to be recorded on the second tape is
Each time the head traces the second tape, the head alternately guides the second tape to the first and second recording/reproducing sections, and alternately creates helical tracks corresponding to the first and second azimuth angles on the second tape. a recording means for forming and recording; and a recording means for alternately transmitting reproduction signals from the first and second recording and reproducing sections each time the head traces the first tape, based on the signal obtained from the detection means. and reproduce helical tracks corresponding to first and second azimuth angles alternately formed on the first tape, and each time the head traces the second tape, the first and second azimuth angles are reproduced. and reproducing means for alternately deriving reproduction signals from the second recording/reproducing section and reproducing helical tracks corresponding to the first and second azimuth angles alternately formed on the second tape. A helical scan type tape recording and reproducing device.