JPS6111953A - Magnetic tape storage device - Google Patents

Abstract

PURPOSE:To make automatically and accurately a program such for a file on a magnetic tape at a high speed without any perception which is requied in conventional manual operation by running the tape almost to a target point at a high speed and then running the tape to the target point at a low speed. CONSTITUTION:The head counter value (based upon the head of the tape) of a target file is supplied to a CPU41, and the current counter value is known through a take-up quantity counting circuit 39 and compared with the target counter value. When the current value is smaller, the tape is taken up at the high speed to the counter value -beta of the target point if the counter value of the target point minus the current counter value is smaller than alpha; and the tape is braked and taken up at the low speed up to the target point. In this case, alpha>beta and beta is set larger than a counter value corresponding to length with which the tape overruns before stopping when the tape is braked in the fast run.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention counts the number of windings of a magnetic tape and moves to a target point on the magnetic tape in two stages: high-speed running and low-speed running. That is, the present invention relates to a magnetic tape storage device that accurately locates the beginning of a file.

[Prior art]

Conventionally, when recording digital data using a storage device using an audio cassette tape, it was necessary to record continuously (sequentially) from the beginning of the tape and read out sequentially. Alternatively, the operator can quickly forward and rewind the tape by looking at the device's kakunta (a device that roughly counts the number of fireflies when the tape is wound) and start playback near the desired file. I had to take the step of letting him do it.

〔the purpose〕

SUMMARY OF THE INVENTION In order to eliminate this inconvenience, the present invention provides a magnetic tape storage device that can automatically locate a target file at high speed.

[Structure of the invention]

The magnetic tape storage device of the present invention, as shown in FIG.
A means 2 for storing digital data on an audio cassette tape 1, a means 5 for reading digital data from the tape 1, a means 4 for winding the tape 1, a means 5 for counting the amount of winding of the tape 1, and the result of 5. 4), and means 6 for supplying digital data to 2 and receiving the result (digital data). The winding means 4 is a device capable of high-speed winding, high-speed rewinding, and low-speed winding based on the command 6.

〔Example〕

In the configuration diagram of the embodiment shown in FIG. 2, 28 is a cassette holder, 29 is a micro cassette 50, which is a supply side reel, 31 is a take-up side reel, 52 is a magnetic tape surface 55, and 45 is a capstan. , 2.5 is a pinch roller,
26 is a capstan motor that rotates the capstan 45 via a transmission belt 27; 24 is a magnetic head;
3 is a tape guide; 22 is an arm to which the head 24 and the tape guide 25' are mounted; 21 is the capstan 45 and the arm 22 are moved to press the capstan 4.5 and the head 24 onto the magnetic tape surface; 54 is a device that generates a counter pulse according to the rotation of the take-up reel 51; 55 is a pedestal on which the above device is loaded; 56 is a circuit that drives the actuator 21; 57 is a digital data the head 24
58 is a circuit for recirculating the signal obtained from the magnetic tape 52 via the magnetic head 24 into digital data; 59 is a circuit for recirculating the signal obtained from the magnetic tape 52 via the magnetic head 24; to count the number of
A winding amount counting circuit 40 is the capstan motor 2
6 is a driving circuit, and 41 is a circuit C that controls all operations of this device.
The PU, in other words, supplies digital data to the recording recirculator 57, receives digital data from the reproducing circuit 58, controls the actuator drive circuit 56, and controls the winding amount counting circuit 59.
A device receives information from and controls the capstan motor drive circuit 40 based on the information on the amount of winding. 42 is a conductor memo used by the 0PU 41 to temporarily store data. J (RAM).

FIG. 4 is a diagram illustrating the hardware configuration of the embodiment shown in FIG. 2 in more detail.

Reference numeral 50 denotes an 8-bit 1-chip microprocessor for controlling this device, which includes a built-in RAM, RoM, and input/output port interface (none of which are shown). Built-in R
The OM is used to store control programs, and the built-in RAM is used as a work area for the CPH of the microprocessor.

51 is the motor 0 for driving the capstan motor 54;
The capstan motor 54 is rotated in the normal direction and reversely in accordance with the PH command. 52 is an IC that controls the rotational speed of the capstan motor 54 using the output waveform of the generator 55 that is synchronized with the capstan motor 54 . 55 is an actuator that drives the arm (22 in FIG. 2) of the microcassette mechanism, and 56 is a circuit that drives the actuator 55. Further, 57 is the actuator 5
This is a circuit that controls 5. 58 is a circuit that shapes the output waveform of a device 59 that generates a counter pulse in synchronization with the take-up reel (51 in FIG. 2) of the microcassette, and then samples and counts the waveform.

Next, the operation of the apparatus configured as described above will be explained based on the flowchart of FIG. First, QPU (Fig. 2
1) gives the counter value at the beginning of the target file (based on the beginning of the tape) (Fig. 5 ■). The CPH41 learns the current counter value from the winding amount meter circuit (Fig. 2 59) ( Figure 5 ■), compare the target counter value and the current counter value (Figure 5 ■), if the current value is smaller,
(1) If the destination point is greater than the current counter value α, wind it up at high speed to the destination point counter value minus β (Fig. 5 ■) and apply the brake there (Fig. 5 ■) , (1) Counter value at the destination point - If the current counter value is smaller than α, high-speed winding is not performed,
Perform only low-speed winding in the second stage (Fig. 3, ■■0),
After high-speed winding is completed, the head is brought into contact with the tape surface once to the destination point, the tape 52t is sandwiched between the pinch roller 25 and the capstan 45, and the tape is wound at a constant speed. In Figure 5 ■, if the current location counter value is larger than the destination counter value, the 3rd step rewinds to the destination at high speed.
Figure @), apply the brakes at that point (Figure 6 ■). Then, wind up the excess amount by running at low speed (Fig. 5■
■0). Here, it is assumed that α>β, and the value of β is larger than the counter value corresponding to the distance that the vehicle travels too far before coming to a stop when the brakes are applied while driving at high speed.

〔effect〕

As described above, the present invention makes it possible to automatically and quickly locate the beginning of a file on a magnetic tape, which conventionally required manual operation and reliance on intuition.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically showing an embodiment of the present invention. FIG. 2 is a diagram showing the hardware configuration of the embodiment of FIG. 1. FIG. 5 is a flowchart showing the operation of the embodiment of FIG. FIG. 4 is a diagram showing FIG. 2 in more detail. 1... Audio cassette tape 2... Recording means 5... Playback means 4...
Winding means 5... Winding amount counting means 6... Control means and above

Claims (1)

[Claims] Audio cassette tape (hereinafter abbreviated as tape)
means for storing digital data; means for reproducing the digital data recorded on the tape; means for counting the amount of winding of the tape; means for winding the tape; After receiving the results and knowing the tape position,
means for controlling the tape winding means; means for causing the tape to travel at high speed to a vicinity of a target point using a command from the control means, the winding amount counting means, and the tape winding means; A magnetic tape storage device comprising: means for running the tape at a low speed to a destination point using the control command, the winding amount counting means, and the tape winding means after the running means is operated.