JPH06150469A - Running speed controller for recording medium - Google Patents

Abstract

PURPOSE:To improve the resposibility of rotational speed of a jogging dial and the running speed of a tape in a low-speed rotating are of the dial and to suppress the unevenness of a tape running caused by the unevenness of the dial rotation in a high-speed rotating area of the dial. CONSTITUTION:In the low-speed rotting area of the jogging dial 1, a tape running system 6 is controlled based on a dial FG pulse itself as pulse data. Then, in the high-speed rotating area of the jogging dial 1, the tape running system 6 is controlled based on an integrally processed dial FG pulse as pulse data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium running speed control device for controlling the running speed of a recording medium such as a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, in a video tape recorder (VTR), for example, there is known a technique of controlling a reproduction speed according to a rotation speed of a dial called a jog dial.

FIG. 4 shows an example of a conventional tape running speed control device for a VTR. In FIG. 4, a frequency generator (FG generator) attached to the rotary shaft of the jog dial (dial knob) 1 and optically or magnetically outputting a pulse (FG pulse) PFG of a frequency corresponding to the rotational speed of the dial 1 is generated. FG pulse PFG from device 2)
Are sent to the counter 3.

The counter 3 counts the FG pulse PFG in a fixed time, and the count data DPC is sent to the arithmetic processing unit 4. In this arithmetic processing unit 4, the count data DPC is averaged by the integration processing.

That is, when the dial 1 is rotated in an attempt to keep the tape running speed constant, a person rotates the dial 1, so that the rotation speed of the dial is uneven. Therefore, the frequency generator 2 produces unevenness. Some F
G pulse PFG is generated. Further, since the FG pulse PFG is counted by the counter 3 for a certain period of time to create the count data DPC, uneven rotation of the dial 1 appears as unevenness of the count data DPC. For this reason, the arithmetic processing unit 4 eliminates the unevenness of the count data DPC by integrating and counting the count data DPC.

The count data DPCA averaged by the arithmetic processing unit 4 is supplied to the tape traveling speed instruction unit 5. The tape traveling speed instructing section 5 converts the count data DPCA into the rotational speed of the dial 1 and further obtains tape traveling speed information (a command CSP for instructing the tape traveling speed) corresponding to the rotational speed. In order to obtain the tape running speed corresponding to this rotation speed, FIG.
A table (tape speed control curve) showing the relationship between the rotation speed of the dial 1 and the tape traveling instruction speed as shown in FIG. This table is stored in, for example, the ROM. Although FIG. 5 shows the relationship between the rotational speed of the dial 1 in one direction and the tape running speed, the tape running speed becomes a negative value when the dial 1 rotates in the other direction, although not shown. .

The command CSP for instructing the tape running speed obtained from the tape running speed instructing section 5 as described above is sent to the tape running system 6. In the tape running system 6, the tape running speed is controlled to be the speed designated by the command CSP.

The flowchart of the processing of the main part in the conventional apparatus of FIG. 4 is as shown in FIG. In FIG. 6, the FG pulse PFG is counted in step S11, the count value is integrated in the next step S12, and a command CSP based on the integrated value and the tape speed control curve as shown in FIG. 5 is generated in step S13. After that, this command CSP is output to the tape running system 6 in step S14.

[0009]

That is, in the conventional running speed control device in which the tape running speed is controlled by the rotating speed of the jog dial 1 as described above, in order to suppress uneven rotation of the dial 1, Pulse (F
The G pulse PFG) is subjected to integral processing by some FG calculation processing, and the tape running system 6 is controlled by using the command CSP based on the processed pulse data (averaged count data DPCA).

However, if the tape running system 6 is controlled based on the pulse data obtained by the integral processing in this way, the response of the tape running speed to the dial rotation speed is delayed in the entire range of the tape running speed to be controlled. It has the drawback of being a victim.

Therefore, for example, the dial pulse (FG
If the pulse PFG) is used as it is without being processed, the uneven rotation of the dial 1 will appear as uneven tape running.

Therefore, an object of the present invention is to provide a running speed control device for a recording medium which does not sacrifice operability and has less tape running unevenness.

[0013]

A traveling speed control apparatus for a recording medium according to the present invention has been proposed in order to achieve the above-mentioned object, and includes pulse generating means for generating a pulse according to the dial rotation speed. , Comparing the number of pulses generated by the pulse generating means with a reference value to determine whether the number of pulses exceeds the reference value or is less than the reference value. It has an integration means for integrating the number of pulses, and a control means for designating the traveling speed of the recording medium according to the integrated value from the integration means or the number of pulses of the pulse generation means, and according to the designation by the control means. Based on the information indicating the traveling speed of the recording medium, the traveling system that drives the recording medium to drive is controlled.

Here, the reference value is preferably set to a value corresponding to a speed equal to or lower than 1 × the traveling speed of the recording medium.

Further, the running speed control apparatus for a recording medium of the present invention compares pulse generation means for generating a pulse according to the dial rotation speed with the number of pulses generated by the pulse generation means and a plurality of reference values. An integrating means for discriminating in which area the pulse number lies with respect to each of the plurality of reference values, and performing integration according to each area on the pulse number from the pulse generating means, and the integrating means. And a control means for designating the traveling speed of the recording medium according to the integral value from, and the traveling of the recording medium is performed based on the information indicating the traveling speed of the recording medium according to the designation by the control means. It is also designed to control the traveling system.

The recording medium used in the present invention is as follows.
A magnetic tape can be taken as an example.

That is, the device of the present invention is a tape running speed control device for controlling the tape running speed by the rotating speed of the jog dial. Specifically, in the low speed rotating area of the dial, the dial FG pulse itself is supplied. Controls the tape running system based on this as pulse data,
In the high speed rotating area of the dial, the tape running system is controlled on the basis of pulse data obtained by performing integral processing of the dial FG pulse using some kind of FG calculation to control the tape rotation speed and the tape in the low speed rotating area of the dial. It is possible to improve the responsiveness of the running speed and suppress the tape running unevenness due to the rotation unevenness of the dial rotation in the high speed rotating region of the dial.

[0018]

According to the traveling speed control apparatus for a recording medium of the present invention, whether or not to integrate the number of pulses (or the degree of integration of the number of pulses) is switched according to the dial rotation speed (rotation speed). There is. For example, set the tape running speed to 1
When the speed is lower than double speed, by not integrating the number of pulses, it is possible to improve the responsiveness of the rotation speed of the dial and the tape running speed. In this case, by integrating the number of pulses, it becomes possible to suppress tape running unevenness due to uneven rotation of the dial.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recording medium running speed control apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of a recording medium running speed control apparatus according to an embodiment of the present invention. The running speed control device for a recording medium according to the present embodiment includes a frequency generator (FG generator) 2 as pulse generating means for generating a pulse according to the rotation speed of a jog dial (dial knob) 1, and the frequency generator 2 described above. The counter 3 which counts the number of FG pulses PFG generated in 1. and the number of pulses generated in the frequency generator 2, that is, the count data DPC from the counter 3 and the reference value are compared and the number of pulses (count data DPC). Means for discriminating whether or not is above or below the reference value, and when the reference value is exceeded, the number of pulses from the frequency generator 2 (count data D from the counter 3)
(PC) integrating means for integrating (averaging), and when it is determined that the reference value is exceeded by the above determination, the tape running speed of the magnetic tape according to the integrated value from the above integrating means is designated, and conversely the above determination is made. When it is determined that the value is less than or equal to the reference value, the tape running speed instructing section 15 as a control means for designating the tape running speed of the magnetic tape according to the count data DPC from the counter 3 is provided. The tape running system 6 for running and driving the magnetic tape is controlled based on the information (command SCSP) indicating the tape running speed of the magnetic tape in accordance with the designation in (1).

In FIG. 1, constituent elements corresponding to those in FIG. 4 described above are designated by the same reference numerals, and detailed description thereof will be omitted.

That is, in FIG. 1, the count data DPC from the counter 3 is sent to the tape running speed instruction unit 15 of the apparatus of this embodiment.

Here, FIG. 2 shows the internal structure of the tape traveling speed instructing section 15. The tape traveling speed instructing section 15 includes a CPU 51, a RAM 52, a ROM 53, and
It comprises a bus 54 and interfaces 55-57.

The count data DPC from the above-mentioned counter 3 is supplied to the CPU 51 via the interface 56. Further, the command SCSP of the present embodiment which indicates the tape running speed output from the CPU 51 is supplied to the tape running system 6 via the interface 57.

In order to obtain the tape running speed corresponding to the rotation speed of the dial 1, the ROM 53 is provided with the dial 1
The table as shown in FIG. 5, which shows the relationship between the rotation speed of the tape and the tape running instruction speed, is stored. That is,
A table is stored in which the tape running speed monotonously changes from 0 to 3 times when the rotation speed of the dial 1 changes from 0 to 3 rotations / second. However, when the dial 1 rotates in the other direction, the tape running speed becomes a negative value.

Note that the table shown in FIG.
It may be stored in M52 and the tape traveling speed corresponding to the rotation speed of the dial 1 may be obtained using the table. In that case, the input means 7 such as the keyboard of FIG. 2 may be connected to the CPU 51 via the interface 55 so that the table stored in the RAM 52 can be changed.

Here, in the tape running speed instruction unit 15 of the apparatus of this embodiment, as described above, together with the processing for obtaining the tape running speed corresponding to the rotation speed of the dial 1 described above,
The count data DPC from the counter 3 is compared with a reference value (judgment reference value) to determine whether or not the count data DPC exceeds the reference value. When the count data DPC exceeds the reference value, the counter 3 outputs from the counter 3 The count data DPC is integrated to output the command SCSP indicating the tape running speed. Conversely, when the count value is less than the reference value, the count data DPC from the counter 3 is sent as it is to the tape running system 6 as the command SCSP. There is.

More specifically, the tape running speed instructing section 15 of the apparatus of the present embodiment prepares a value corresponding to 1 times the tape running speed as the reference value, and count data DPC from the counter 3 is prepared. It is determined whether or not the value of is above or below a value (reference value) corresponding to 1 × the tape running speed. In this determination, the counter 3
If it is determined that the value of the count data DPC from the reference data exceeds the reference value, the count data DPC is subjected to integral calculation (integral processing), and the command SCSP corresponding to the output of the integral calculation is sent to the tape running system. When the count data DPC is determined to be less than or equal to the reference value, the command SCSP corresponding to the count data DPC (count data DPC not subjected to integral processing) is sent to the tape running system. I try to send it.

The flowchart of the processing of the main part in the apparatus of this embodiment shown in FIGS. 1 and 2 is as shown in FIG. In FIG. 3, the FG pulse PFG is counted in step S1, and it is determined in the next step S2 whether or not the count data DPC exceeds the reference value. When it is determined in step S2 that the count data DPC has exceeded the reference value (YES), the process proceeds to step S3, the count data DPC is subjected to integration processing in step S3, and then the process proceeds to step S4. If it is determined in step S2 that the count data DPC has not exceeded the reference value (NO), the process proceeds to step S4. Step S
At 4, the command SCSP is generated according to the tape speed control curve shown in FIG. 5, and then at step S5 this command SCSP is output to the tape running system 6.

From the above, when the fine tape feeding is performed at a low tape running speed such as 1 × speed in the running speed control apparatus of this embodiment, the rotation of the dial 1 becomes low, The count data DPC becomes less than the above reference value. At this time, the integration means does not operate, and the command SCSP based on the tape speed control curve corresponding to the unprocessed count data DPC causes the tape traveling system 6 to operate.
Therefore, it becomes possible to instruct the tape running without including the response delay due to the integration effect. Incidentally, in the past, since the integration processing was uniformly applied as shown in FIG. 6 described above, when fine tape feeding is performed at a low speed, the response of the tape running speed instruction command to the rotational speed of the dial is poor. Was becoming.

On the other hand, when the tape running speed is high, that is, when the count data DPC exceeds the reference value,
The integrating means operates, whereby the count data DPC is subjected to integration processing, and integrated count data in which unevenness of the count data DPC caused by uneven rotation of the dial 1 is suppressed can be obtained, and a tape speed control curve corresponding to this can be obtained. Based on this, the command SCSP is input to the tape running system 6, so that it is possible to give a tape running instruction in which uneven rotation is suppressed.

In this embodiment, the reference value is made to correspond to the number of rotations of the dial 1 (twice the tape running speed) at 2 rotations per second as in the case of FIG. 5 described above, but the present embodiment is not limited to this. It goes without saying that any dial 1 rotation speed (tape running speed) can be accommodated.

From the above, according to the present embodiment, in the high speed region where the tape running speed with respect to the rotation speed of the dial 1 is required to be smoother,
The unevenness of rotation is suppressed by the integration effect, and the responsiveness is improved in the low speed region where a fast response is required, so that the operability of the entire control speed range can be improved.

By the way, in the above-mentioned embodiment, the example in which the count data DPC is compared by using one reference value has been described, but a plurality of reference values are used and the comparison result of each reference value and the count data DPC is used. It is also possible to perform an integral calculation suitable for each of the above.

That is, in this case, the tape running speed instructing section 15 of the embodiment apparatus of the present invention (another embodiment apparatus) is a comparison means for comparing the value of the count data DPC with a plurality of reference values, and the above-mentioned count. It includes an integrating means for discriminating in which area the value of the data DPC is in relation to each of the plurality of reference values, and performing integration according to each area on the count data DPC. It is composed of control means for designating the traveling speed of the magnetic tape according to the integral value. Therefore, in this embodiment, the command SCSP indicating the traveling speed of the magnetic tape according to the designation by the tape traveling speed instruction section 15 is provided. Based on the above, the running system 6 for running and driving the magnetic tape is controlled. In addition,
These comparison means, integration means, and control means are actually shown in FIG.
Since it is included in the CPU 51 of FIG.

More specifically, the tape traveling speed instructing section 15 of the apparatus of the other embodiment prepares, for example, n reference values, and an arbitrary reference value m-1 of the n reference values. ，
With respect to m and m + 1, the count data DPC is less than (or less than) the reference value m-1 or the count data DPC is greater than (or more than) the reference value m-1 and less than (or less than) the reference value m-1. ), Or the count data DPC is greater than (or more than) the reference value m, the reference value m +
It is discriminated whether it is 1 or less (or less), different tape traveling speeds are designated according to the discrimination results, and the command SCSP corresponding to these tape traveling speeds is sent to the tape traveling system 6.

As a result, in the apparatus of the other embodiment, it is possible to finely control the tape running speed according to the dial rotation speed.

[0038]

As described above, in the recording medium running speed control apparatus of the present invention, the number of pulses corresponding to the dial rotation speed is compared with the reference value to determine whether the number of pulses exceeds the reference value. If it is determined that the number of pulses exceeds the reference value, the number of pulses is integrated, or the number of pulses is compared with a plurality of reference values to determine which region the number of pulses is in each of the plurality of reference values. By performing integration according to each area and controlling the running speed of the recording medium according to the integrated value or the number of pulses, running of the recording medium without sacrificing operability and less tape running unevenness Speed control is possible.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a traveling speed control device for a recording medium according to an embodiment of the present invention.

FIG. 2 is a block circuit diagram showing a specific configuration of a tape traveling speed instructing unit of the apparatus of this embodiment.

FIG. 3 is a flowchart showing a procedure of processing of main parts of the apparatus of this embodiment.

FIG. 4 is a diagram showing a schematic configuration of a conventional device.

FIG. 5 is a diagram showing a relationship between a dial rotation speed and a tape running speed.

FIG. 6 is a flowchart showing a procedure of processing of main parts of a conventional example device.

[Explanation of symbols]

 1 --- Jog dial 2 --- Frequency generator 3 --- Counter 6 --- Tape running system 7 --- Input means 15 --- Tape running speed instruction unit 51 --- CPU 52-RAM 53-ROM 54-Bus 55-57 interface

Claims (4)

[Claims] 1. A pulse generating means for generating a pulse corresponding to a dial rotation speed is compared with a pulse number generated by the pulse generating means and a reference value to determine whether or not the pulse number exceeds the reference value. If it is determined that the number of pulses exceeds the reference value, an integrating means for integrating the number of pulses from the pulse generating means, and a traveling speed of the recording medium according to the integrated value from the integrating means or the number of pulses of the pulse generating means are designated. A traveling speed of the recording medium, the traveling system controlling the traveling speed of the recording medium based on information indicating the traveling speed of the recording medium according to the designation by the control means. Control device. 2. The traveling speed control device for a recording medium according to claim 1, wherein the reference value is set to a value corresponding to a speed equal to or less than 1 × the traveling speed of the recording medium. 3. A pulse generating means for generating a pulse according to a dial rotation speed is compared with a pulse number generated by the pulse generating means and a plurality of reference values, and the pulse number is set to each of the plurality of reference values. On the other hand, it is determined which area is in which area, and integration means for performing integration according to each area on the number of pulses from the pulse generation means, and running speed of the recording medium according to the integrated value from the integration means. And a control unit for designating the recording medium, and based on information indicating the traveling speed of the recording medium according to the designation by the control unit, a traveling system for driving and driving the recording medium is controlled. Traveling speed control device. 4. The running speed control device for a recording medium according to claim 1, wherein the recording medium is a magnetic tape.