JPH0795381B2 - Playback device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus, particularly a reproducing apparatus suitable for use in a case of reading subcode data at high speed search start in a rotary head type magnetic tape reproducing apparatus.

[Outline of Invention]

According to the present invention, the drum control circuit for controlling the drum motor to keep the relative speed between the tape and the head constant is controlled by the control means, and the information is read from the tape through the head, and the tape is stopped at the start of the high speed search. In this state, drive the drum control circuit to rotate the drum and then apply tension to the tape to read the subcode data from the tape so that skipping of the subcode data at the start of high-speed search is eliminated. It was done.

[Prior Art] In a rotary head type magnetic tape reproducing apparatus, it is general to perform a high-speed search to detect sub-code data before the start of a normal performance to find the beginning of the music. In such a high-speed search, if the high-speed search is started from a state where no tape tension is applied such as a stopped state, the reel motor rotates and the tape tension is applied, and the reel motor is read before the sub-code data on the tape is read. May already stand up.

[Problems to be solved by the invention]

In such a case, the tape is sent before sufficient tape tension is obtained, and the subcode data recorded on the tape of the sent length cannot be read. Sometimes I skipped one song.

When the reproduction data is not synchronized with the reproduction clock and the relative speed deviates greatly from the set value, control is performed using rough servo, and when the reproduction data is synchronized with the reproduction clock and the relative speed is close to the set value. In the drum follower type constant relative velocity servo system (Japanese Patent Application No. 60-146268) that uses two systems that control using the PLL servo, the RF signal is detected if the tape tension is not sufficient.
The CRC code may not be detected, and you will enter the rough servo. When the tape is running during this rough servo, the subcode data cannot be read during that time.

The present invention has been made in view of the above point, and it is possible to eliminate the skip of the subcode data at the start of high-speed search, and to avoid the rough servo when the drum following type constant relative speed servo is applied. The present invention provides a playback device that can

[Means for solving problems]

A reproducing apparatus according to the present invention has a head (2) mounted thereon, a drum (1) on which a tape (3) is slidably contacted, a drum motor (10) for driving this drum, and a drum motor (10) which controls the drum motor to perform relative movement. A drum control circuit (11) that keeps the speed constant,
Control means (9) for controlling the drum control circuit and reading information from the tape through the head, and driving means for driving a reel around which the tape is wound (6,
7, 8) and is configured to read the subcode data by applying tension to the tape after driving the drum control circuit while the tape is stopped at the start of high-speed search.

[Action]

At the start of the high speed search, the control means (9) rotates the drum motor (10) through the drum control circuit (11) while the tape (3) is stopped, and the relative speed servo is applied. Next, drive means (6 to 8) are used to reel (4,5)
Is rotated in a predetermined direction to apply tension to the tape and read the subcode data. As a result, the subcode data can be surely read out at the start of the high-speed search, and in the drum following type constant relative speed servo system, the rough servo is not involved and the subcode is not skipped.

〔Example〕

An embodiment of the present invention will be described below in detail with reference to FIGS.

FIG. 1 shows a circuit configuration of this embodiment. In FIG. 1, (1) is a drum, a head (2) is mounted on the drum (1), and a tape (3) is slidably contacted. To be done.
(4) and (5) are supply reels and take-up reels around which the tape (3) is wound, and (6) and (7) are reel motors that rotate and drive the reels (4) and (5), respectively. (8) is a reel motor control circuit for controlling the reel motors (6) and (7). The reel motor control circuit (8) is controlled by a control signal from the system control circuit (9). Further, tape information including at least subcode information read from the tape (3) by the head (2) is supplied to the system control circuit (9).

(10) is a drum motor for rotating the drum (1),
(11) is a drum control circuit that controls the drum motor (10) to keep the relative speed of the head and tape constant, and (12) is a rotation detector that detects the rotation of the drum motor (10).
The output of the rotation detector (12) is supplied to the drum control circuit (11), and the speed information is supplied from the drum control circuit (11) to the system control circuit (9). Further, the system control circuit (9) supplies a control signal including a drum motor on / off signal, a constant phase speed constant servo on / off signal, etc. to the drum control circuit (11).

Next, the circuit operation of FIG. 1 will be described with reference to the flowchart of FIG.

In step (a), it is assumed that the high speed search is started in a state where no tape tension is applied such as a stopped state. System control circuit (9) in step (b)
A control signal for turning on the drum motor (10) is supplied to the drum control circuit (11), whereby the drum motor (1
0) is turned on and the drum (1) is driven so as to have a predetermined constant speed. At the same time, the system control circuit (9) supplies a control signal for turning on the constant relative speed servo to the drum control circuit (11) to apply the constant relative speed servo in advance.

Next, in step (c), the system control circuit (9) supplies a control signal for applying the tape tension to the reel motor control circuit (8), and the reel motor control circuit (8) supplies the reel motors (6), ( 7) is driven to apply a predetermined tension to the tape (3) wound around the reels (4) and (5). This tape (3)
There are various possible methods for applying tension to the.
For example, the take-up reel (5) is locked and the supply-side reel (4) is rotated counterclockwise to apply tension to the tape (3), or the supply-side reel (4) is locked to take-up reel. Rotate (5) clockwise and tape (3)
There is a method of applying tension to the tape, or rotating the supply reel (4) counterclockwise and rotating the winding reel (5) clockwise to apply tension to the tape (3).

Since the tape (3) comes into sliding contact with the drum (1) by applying tension to the tape (3), the tape information containing at least subcode data from the tape (3) by the head (2) in step (d). Is supplied to the system control circuit (9). In step (e), the system control circuit (9) determines whether or not the read subcode data is the target data, and if it is the target data, the process proceeds to step (f). Then, here, the system control circuit (9) supplies a control signal to the reel motor control circuit (8) to stop the operations of the reel motors (6) and (7), and at the same time sends the control signal to the drum control circuit (11). The supply is stopped to stop the operation of the drum motor (10) and the operation of the servo with a constant relative speed. At this time, the tension applied to the tape (3) is released. Then, in step (g), the high speed search is ended.

On the other hand, in step (e), if the read subcode data is not the desired data, step (h)
Then, the system control circuit (9) supplies a control signal to the reel motor control circuit (8) to rotate the reel motors (6) and (7), and the reel motors (4) and (5) are wound. Run the existing tape (3) at high speed. At this time, since the relative speed between the tape and the head is constant, the head (2) reads the tape information including at least the subcode data from the tape (3) and supplies it to the system control circuit (9).

In step (i), the system control circuit (9) controls whether or not the read subcode data is the desired data, and if it is not the desired data, the same operation is continued to obtain the desired data. If it is data, go to step (nu). In step (n), the system control circuit (9) controls the reel motor control circuit (8) to stop the operation of the reel motors (6) and (7),
The running of the tape (3) wound around the reels (4) and (5) is stopped urgently. If the tape 3 overshoots due to this emergency stop, the system control circuit 9 controls the reel motor control circuit 8,
Correct the overshoot of tape (3). After that, in the same manner as described above, all the operations are stopped in step (f), and the high speed search is ended in step (g).

In addition to the above-described method for applying tension to the tape, the rising of the reel motor may be controlled and maintained as shown by the solid line b in FIG. That is, generally, the start-up of the reel motor has a characteristic as shown by the broken line a in FIG. 3, but as shown by the solid line b, the start-up of the reel motor is delayed and a tension is applied to the tape for a time T only. To As a result, the above-mentioned method requires a new reel mode such as stopping one reel, but the method of FIG. 3 does not require such a new reel mode, and the conventional fast-forward (FF) search mode. ,
You can search only in the winding (REW) mode.

Further, when the present invention is applied to the drum follow-up type constant relative speed servo system, if this servo is turned on at the start of high-speed search, the PLL servo mode is set immediately when the tape tension is applied before running the tape, and the rough servo mode is set. Since it does not become, there is no skip of subcode data.

〔The invention's effect〕

As described above, according to the present invention, the drum is rotated at the start of high-speed search before the tape is run at high speed, and the tape tension is applied to read the subcode data. Information such as how many minutes have passed from the tape top) is obtained, skipping subcode data at the beginning of tape feeding is eliminated, and the cue of a song can be accurately performed. Further, since the rough servo is not used in the drum following type constant relative speed servo system, the subcode data is not skipped.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flow chart for explaining the operation of FIG. 1, and FIG. 3 is a rising characteristic diagram of a reel motor. (1) is a drum, (2) is a head, (3) is a tape,
(4) and (5) are reels, (6) and (7) are reel motors, (8) is a reel motor control circuit, (9) is a system control circuit, (10) is a drum motor, and (11) is a drum. It is a control circuit.

Claims (1)

[Claims] 1. A drum on which a head is mounted and on which a tape slides, a drum motor for driving the drum, a drum control circuit for controlling the drum motor to keep a relative speed constant, and the drum control circuit. Control means for reading information from the tape through the head, and driving means for driving the reel around which the tape is wound, and the drum control circuit when the high speed search is started and the tape is stopped. A reproducing device characterized in that after the tape is driven, tension is applied to the tape to read the subcode data.