CN1175762A - Method for controlling high-speed tape running in magnetie recording/reproducing apparatus - Google Patents
Method for controlling high-speed tape running in magnetie recording/reproducing apparatus Download PDFInfo
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- CN1175762A CN1175762A CN97116721A CN97116721A CN1175762A CN 1175762 A CN1175762 A CN 1175762A CN 97116721 A CN97116721 A CN 97116721A CN 97116721 A CN97116721 A CN 97116721A CN 1175762 A CN1175762 A CN 1175762A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000013459 approach Methods 0.000 abstract description 4
- 230000005236 sound signal Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/46—Controlling, regulating, or indicating speed
- G11B15/48—Starting; Accelerating; Decelerating; Arrangements preventing malfunction during drive change
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/05—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container
- G11B15/06—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing auxiliary features on record carriers or containers, e.g. to stop machine near the end of a tape
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/05—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container
- G11B15/093—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing driving condition of record carrier, e.g. travel, tape tension
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/90—Tape-like record carriers
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Abstract
A method for controlling high-speed tape running in magnetic recording/reproducing apparatus, includes the steps of: executing fast forward or fast backward mode operations related to the small hub disk size when the cassette tape has small hub disk size, and executing fast forward or fast backward mode operations related to big hub disk size when the cassette tape has big hub disk size. When the tape approaches its guide end or last end during the fast forward or fast backward mode operations related to big hub disk size, the running speed of the tape is reduced.
Description
The present invention relates to a method for controlling a high-speed tape running operation in a magnetic recording/reproducing apparatus such as a video cassette recorder, which is capable of controlling the running speed of a video tape at the time of high-speed running in a fast forward mode or a fast reverse mode of the video tape.
Magnetic recording/reproducing apparatuses are generally used to record video and audio signals on a video tape and to reproduce the signals.
Such a magnetic recording/reproducing apparatus has various operation modes, for example, a recording mode in which video and audio signals are recorded on a video tape while the video tape is running at a normal speed, a playback mode in which video and audio signals recorded on the video tape are reproduced while the video tape is running at a normal speed, a forward or reverse search mode in which a program recorded on the video tape is searched while the video tape is running forward or reverse at a high speed, and a fast forward or fast reverse mode in which the video tape is running forward or reverse at a high speed.
For playback, recording, forward seek and reverse seek, the running speed of the video tape can be appropriately adjusted by controlling the driving speed of the leader motor. In the fast forward or reverse mode, the supply reel and the take-up reel are directly rotated by the driving force of a reel motor, thereby causing the video tape to run at high speed.
In the case where the video tape is run at a high speed in the fast forward or reverse mode, when the video tape is run to a position near its leading end or trailing end, it is necessary to reduce the running speed of the video tape so as to stop the running of the video tape at the leading end or trailing end. If not, the driving force of the motor running the video tape or the inertial force generated by the rotation of the hub around which the video tape is wound will exert a large tensile stress on the video tape. In this case, the video tape may be damaged, for example, by being pulled apart or stretched.
In order to solve the above-mentioned problem, a method is proposed, which comprises: judging whether the video tape running at high speed in fast forward or fast reverse mode is near its leading or trailing end, and reducing the running speed of the video tape to prevent the video tape from being damaged when the video tape is judged to be near its leading or trailing end.
Fig. 1 is a perspective view of a general home video system (NHS) standard cassette tape.
In fig. 1, the tape cartridge is denoted by reference numeral 1. Reference numerals 2 and 3 denote supply and take-up hubs included in the magnetic tape cartridge 1, respectively. Reference numeral 4 denotes a video tape wound around the supply and take-up hubs 2 and 3.
The video tape 4 is coated with a layer of magnetic material in order to record video and audio signals during playback of these signals. The video tape 4 comprises an opaque tape 5 and a pair of transparent leader tapes 6.
Two guide belts 6 are located at the supply and take-up hubs 2 and 3, respectively. That is, one end of each leader tape 6 is connected to one joint end of the magnetic tape 5. The other of the guide belts 6 is connected to the supply and take-up hubs 2 and 3, respectively.
In order to determine the amount of video tape wound on the supply and take-up hubs 2 and 3, respectively, in the above-described magnetic tape cassette, it is first necessary to determine the size of the supply and take-up hubs 2 and 3.
Generally, video tapes wound on the hub of the cassette tape may have various lengths according to the type of the cassette tape based on the total running time in the normal running mode. For example, the magnetic tape cassettes are classified into those for 10 minutes, 20 minutes, 30 minutes, 45 minutes, 60 minutes, 80 minutes, 100 minutes, 160 minutes, 180 minutes, and 200 minutes.
For these types of cartridges, two standard hub sizes are used. I.e. a hub for 10 min, 20 min, 30 min, 45 min and 60 min cassettes having a larger diameter of 62.04 mm. A hub for 80 minute, 100 minute, 160 minute, 180 minute and 200 minute magnetic tape cassettes having a smaller size of 26.12mm diameter.
Where smaller sized hubs are used, there is a provision for the maximum diameter of the video tape to be wound. According to this provision the maximum diameter of the wound video tape must be equal to or smaller than the diameter of the larger sized hub, i.e. 62.04 mm.
For this reason, thinner video tapes are used for longer running time cartridges.
For example, a 120-minute video cassette tape uses a video tape having a thickness of about 20 μm, a 160-minute video cassette tape uses a video tape having a thickness of about 16 μm, a 180-minute video cassette tape uses a video tape having a thickness of about 15 μm, and a 210-minute video cassette tape uses a video tape having a thickness of about 14 μm, so that the maximum diameter of the video tape in a wound state is equal to or less than 31.02 mm.
In a Standard Play (SP) mode, the video tape runs at 33.35 mm/sec.
A signal detection device, such as a Hall sensor, is mounted in a suitable location adjacent the lead motor. The signal detection device detects the rotation of the master motor when the master motor is driven, thereby generating a Capstan Frequency Generator (CFG) signal.
When the video tape is operated in the SP mode, the CFG signal has a frequency of 1, 080 Hz. In one SLP mode, the CFG signal has a frequency of 360 Hz.
According to one prior art method, hub size is determined based on the tape cassette standard and the CFG signal described above. And judging the amount of the video tape wound on the tape supply hub and the tape take-up hub respectively according to the judged size of the hub.
According to this technique of determining the size of the hub, one rotation of each of the supply reel and the take-up reel is detected during the running of the video tape. In this case, the number of CFG signals generated for each rotation of the supply and take-up spools is counted. Based on the calculated values, a judgment value of the hub size is calculated using the following equation (1):
[ equation 1]
Pc2＝Ps2+Pt2
Wherein,
“Pc2"a judgment value representing the size of the hub;
"Ps" represents the number of CFG signals generated for one rotation of the tape spool; and
"Pt" represents the number of CFG signals generated by one revolution of the take-up spool.
Determination of hub size, Pc2In equation (1) are constants independent of the running conditions of the video tape.
Now, the judgment value, Pc, of the size of the hub will be described2Is the reason for the constant.
First, in the case of the magnetic tape cartridge shown in fig. 2, it is assumed that "Rh" represents the radius of each of the supply and take-up hubs 2 and 3, "Rs" represents the radius of the video tape 4 wound on the supply hub 2, and "Rt" represents the radius of the video tape 4 wound on the take-up hub 3.
In this case, the total area of the video tape wound around the supply and take-up hubs 2 and 3 can be calculated by the following equation (2):
[ equation 2]
S＝πRs2+πRt2-2πRh2
Wherein,
"S" represents the total area of the video tape 4 wound on the supply and take-up hubs 2 and 3; and
“2πRh2"represents the sum of the area of the supply hub 2 and the area of the take-up hub 3.
The total length of the video tape 4 can be calculated by dividing the total area S of the video tape 4 obtained from equation (2) by the thickness of the video tape 4, as shown in equation (3) below:
[ equation 3]
L＝(πRs2+πRt2-2πRh2)/Td
＝π(Rs2+Rt2-2Rh2)/Td
Wherein,
"L" represents the total length of the video tape 4; and
"Td" represents the thickness of the video tape 4.
A relationship expressed as "speed-distance/time" is generally established between distance, speed and time. From this relationship, the total running time of the video tape 4 at a constant running speed can be calculated by the following equation (4):
[ equation 4]
T＝L/Vo
＝{π/(Td×Vo)}×(Rs2+Rt2-2Rh2)
Wherein,
"T" represents the total running time of the video tape 4; and
"Vo" represents the running speed of the video tape 4.
The circumferential length of the video tape 4 wound on each of the supply and take-up hubs 2 and 3 at a certain operating time point can be calculated by the following equation (5):
[ equation 5]
Cs＝2πRs＝Vo×Ts＝Vo×Ps/F
Ct＝2πRt＝Vo×Tt＝Vo×Pt/F
Wherein,
"Ts" represents the time for one revolution of the tape spool;
"Tt" represents the time of use for one revolution of the take-up spool;
"Ps" represents the number of CFG signals generated for one rotation of the tape spool; and
"Pt" represents the number of CFG signals generated by one revolution of the take-up spool;
from equation (5), the radius Rs of the video tape 4 wound on the supply hub 2 and the radius Rt of the video tape 4 wound on the take-up hub 3 can be calculated by equation (6) below:
[ equation 6]
Rs＝(Vo×Ps)/(2πF)
Rt＝(Vo×Pt)/(2πF)
When equation (6) is substituted into equation (4), the total running time of the video tape 4 can be calculated by equation (7) below:
[ equation 7]
T＝{π/(Td×Vo)}×{(Vo/2πF)2×(Ps2+Pt2)-2Rh2}
＝{Vo/(Td×4πF2)}×(Ps2+Pt2)-{2Rh2/(Td×Vo)}
The value "Td × 4 π F" in equation (7)2"and" 2Rh2/(Td × Vo) "is a constant regardless of the running condition of the video tape.
Since the value "T" in equation (7), i.e., the entire running time of the video tape 4, is also constant, "Pc" in equation (1)2"value (Pc)2＝Ps2+Pt2) Is a constant.
According to the above principle, the judgment value of the hub size, Pc, as expressed in equation (1)2The number of CFG signals generated by one rotation of the supply reel and the number of CFG signals generated by one rotation of the take-up reel are calculated.
According to the calculated hub plate size judgment value Pc2Previously stored data may be retrieved to determine the size of the hub. The amount of the video tape wound around the supply and take-up hubs 2 and 3 is determined based on the determined hub size.
FIG. 3 shows the determination values Pc according to different hub sizes2The type of cartridge and the hub size.
In FIG. 3, the hub size judgment value Pc2Is expressed in hexadecimal numeric form. "T10", "T20", "T30", "T45", "T60", "T80", "T100", "T120", "T160", "T180" and "T200" represent cartridges of 10 minutes, 20 minutes, 30 minutes, 45 minutes, 60 minutes, 80 minutes, 100 minutes, 160 minutes, 180 minutes and 200 minutes, respectively.
When a fast forward or a fast reverse mode is performed in a magnetic recording/reproducing apparatus, the hub size is judged while the video tape is running.
After the determination of the hub size is completed, the amount of the video tape wound around the supply and take-up hubs 2 and 3, respectively, is determined, and the video tape is run at a speed corresponding to about 11 times the normal speed, as shown in fig. 4.
When it is judged that the video tape 4 is near its leading end or trailing end based on the judged amount of the video tape, the running speed of the video tape 4 is reduced to about 3 times as high as the normal speed, thereby preventing the video tape 4 from being damaged.
This prior art method can accurately determine the hub size of a standard cartridge having a standard hub size. Therefore, it can realize fast forward or fast reverse operation at a high speed in a short period of time without causing any damage to a video tape.
However, there are various types of magnetic tape cartridges having hub sizes other than the standard hub sizes described above.
For example, a 160 minute cassette tape is manufactured by winding a 20 μm thick video tape for a 120 minute cassette tape around a standard small size hub, the diameter of the wound tape being larger than the size of the standard large size hub. Therefore, in such a case, it is erroneously judged that the cartridge uses a hub of a standard large size.
If it is erroneously determined that the cartridge using the standard small-sized hub uses the standard large-sized hub, the running speed of the video tape starts to decrease when the video tape has not approached its leading or trailing end.
As a result, the fast forward or fast reverse mode operation takes a long time.
Although erroneous judgment of the size of the hub rarely occurs in the case of using a standard large-sized hub, erroneous judgment often occurs in the case of using a standard small-sized hub.
Accordingly, it is an object of the present invention to provide a method of controlling a high-speed tape running operation in a magnetic recording/reproducing apparatus, which can achieve a high-speed fast-forward or fast-reverse mode operation even when an erroneous hub size determination occurs.
To achieve this object, the present invention provides a method of controlling a high-speed tape running operation in a magnetic recording/reproducing apparatus, wherein the judgment of the hub size of a magnetic tape cartridge loaded in the magnetic recording/reproducing apparatus is made while a fast-forward or fast-rewind mode operation is performed. When the magnetic tape cartridge has a small hub size, a fast forward or fast reverse mode operation is performed in association with the small hub size.
When the cartridge has a small hub size, it may be erroneously determined that the cartridge has a large hub size.
For this reason, when the magnetic tape cartridge is judged to have a large hub size, re-judgment of the hub size is performed. That is, when the magnetic tape cartridge has a large hub size, a fast forward or fast reverse mode operation associated with the large hub size is performed. The running speed of the video tape is reduced when the video tape approaches its leading or trailing end during the execution of fast forward or fast reverse mode operations associated with large hub sizes.
The determination of the size of the hub is made by counting the number of CFG signals generated for one rotation of the take-up spool and the number of CFG signals generated for one rotation of the take-up spool, calculating the ratio between the two counts, and comparing the calculated ratio with a predetermined reference value. And performing proper fast forward or fast reverse mode operation according to the judged hub size.
Other objects and features of the present invention will be more clearly understood from the following description of the embodiments with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a generic VHS standard tape cartridge;
FIG. 2 is a schematic view for explaining a conventional method of determining the size of a hub;
FIG. 3 is a table of cassette types according to different hub sizes determined according to prior methods;
FIG. 4 is a graph showing high speed tape running operation according to a prior art method;
FIG. 5 is a block diagram of the structure of a magnetic recording/reproducing apparatus to which the control method of the present invention is applied;
FIG. 6 is a flow chart showing sequential steps of a control method according to the present invention;
fig. 7 is a graph showing a high-speed tape running operation according to the control method of the present invention.
A method of controlling a high-speed tape running operation in a magnetic recording/reproducing apparatus of the present invention will be described with reference to fig. 5 to 7.
Fig. 5 is a block diagram of the structure of a magnetic recording/reproducing apparatus to which the control method of the present invention is applied.
In fig. 5, reference numeral 10 denotes a microcomputer for controlling the operation of the magnetic recording/reproducing apparatus, determining the hub size of the magnetic tape cartridge loaded in the magnetic recording/reproducing apparatus, and controlling the fast forward or fast reverse mode operation according to the determined hub size.
According to the control method of the present invention applied to the magnetic recording/reproducing apparatus having the above-described structure, it is determined whether the user selects a high-speed tape running operation for the fast forward or fast rewind mode at step S1.
When it is determined at step S1 that the high speed tape running operation is selected, the hub size of the magnetic tape cartridge is judged at step S2.
For the hub size judgment, the microcomputer 10 calculates the number Ps of CFG signals generated by the CFG signal generating unit 12 for one rotation of the supply spool and the number Pt of CFG signals generated by the CFG signal generating unit 12 for one rotation of the take-up spool, each one rotation of the supply and take-up spools being detected by the spool rotation detecting unit 11. The calculated number Ps and Pt of CFG signals are substituted into equation (1) to calculate a hub size determination value. And judging the hub size of the tape cassette according to the calculated hub size judgment value.
From the result of the hub size judgment, it is determined whether the cartridge has a large hub size at step S3.
When it is determined at step S3 that the cartridge has a small hub size, a high-speed tape running operation associated with the small hub size is performed at step S4.
That is, the reel motor 13 is driven to run the video tape at a high speed equivalent to about 11 times the normal speed. As the video tape approaches its leading or trailing end, the running speed of the tape is reduced to a speed equivalent to about 3 times the normal speed. When the video tape reaches its leading end or trailing end, the microcomputer 10 stops the operation of the video tape.
On the other hand, when it is determined at step S3 that the magnetic tape cartridge has a large hub size, the reel motor 13 is driven to run the video tape at high speed at step S5. In step S6, the amounts of the video tapes wound around the supply and take-up hubs, respectively, are determined. Based on the judged amount of the video tape, it is determined whether the video tape is near its leading end or trailing end at step S7.
That is, in the case of performing the fast forward mode operation, it is determined whether the current position of the video tape wound on the tape supply hub corresponds to a position near the trailing end of the video tape. Where the fast reverse mode operation is performed, it is determined whether the current position of the video tape wound on the take-up hub corresponds to a position near the leading end of the video tape.
When it is judged at step S7 that the video tape is near the leading or trailing end thereof, the microcomputer 10 reduces the running speed of the video tape to a speed corresponding to about 3 times the normal speed at step S8. In step S9, the microcomputer 10 calculates the number Ps of CFG signals generated by the CFG signal generating unit 12 when the supply reel rotates one revolution, and the number Pt of CFG signals generated by the CFG signal generating unit 12 when the take-up reel rotates one revolution.
From the calculated number of CFG signals, Ps and Pt, a value of "Ps/Pt" is calculated at step S10. Then, it is judged at step S11 whether the value "Ps/Pt" is between a predetermined first reference value and a predetermined second reference value. For example, it is judged whether the value "Ps/Pt" is between 0.8 and 1.3.
In the case where it is judged that the video tape is near the leading end or the trailing end thereof, as long as the hub size judged at step S2 is accurate, the video tape is in a state where a large part thereof is wound around one of the supply and take-up hubs and a small part thereof is wound around the other. In this case, the value "Ps/Pt" is greater than the first reference value or less than the second reference value.
When it is erroneously determined at step S2 that the video cassette tape has a large hub size despite the fact that it has a small hub size, the state of the video tape is such that a considerable amount of video tape is wound on both the supply and take-up hubs. In this case, the value "Ps/Pt" is between the first and second reference values.
Therefore, when it is judged at step S11 that the value "Ps/Pt" is between the first and second reference values, the hub size is re-judged at step S13. That is, it is judged again that the cartridge has a small hub size because the value "Ps/Pt" between the first and second reference values means that the hub size of the cartridge is small.
When the cartridge is judged to have a small hub size, a high-speed tape running operation associated with the small hub size is performed in the existing manner.
On the other hand, when it is judged that the cartridge magnet has a large hub size, as shown in fig. 7, a high-speed tape running operation associated with the large hub size is performed. When the video tape approaches the leading or trailing end, the hub size is again determined.
When it is still determined at the re-determination step that the cartridge has a large hub size, the video tape is run at a low speed at step S12 until it reaches its leading or trailing end. On the other hand, when it is judged at the re-judgment step that the magnetic tape cartridge has a small hub size, a high-speed tape running operation associated with the small hub size is performed at step S14.
Therefore, according to the present invention, even when a cartridge having a small hub size is erroneously judged to have a large hub, a fast forward or fast reverse mode operation can be achieved for a short period of time.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (4)
1. A method of controlling a high-speed tape running operation in a magnetic recording/reproducing apparatus, comprising the steps of:
determining whether a current operation mode of the magnetic recording/reproducing apparatus corresponds to a high-speed tape running operation mode;
judging the hub size of the magnetic tape cartridge loaded in the magnetic recording/reproducing apparatus when it is judged in the operation mode judging step that the current operation mode corresponds to the high-speed tape running operation mode;
performing a high-speed tape running operation associated with the small hub size when the magnetic tape cartridge is judged to have the small hub size in the hub size judging step;
when it is judged in the hub size judging step that the magnetic tape cartridge has a large hub size, performing a high-speed tape running operation associated with the large hub size and, at the same time, judging again the hub size of the magnetic tape cartridge;
if the hub size is judged to be large in the hub size re-judgment step, the running speed of the video tape cartridge is reduced until the video tape runs to the leading end or the trailing end thereof; and
if it is judged in the hub size re-judging step that the cartridge has a small hub size, a high-speed tape running operation associated with the small hub size is performed.
2. The method of claim 1, wherein the hub size determining step comprises the steps of:
calculating the number (Ps) of Capstan Frequency Generator (CFG) signals included in the magnetic recording/reproducing apparatus for a single rotation of the tape reel, and the number (Pt) of CFG signals included in the magnetic recording/reproducing apparatus for a single rotation of the tape reel;
substituting the calculated number of CFG signals (Ps and Pt) into the following equation, thereby calculating a hub size determination value (Pc)2)：
Pc2＝Ps2+Pt2(ii) a And
and determining the hub size of the tape cassette based on the calculated hub size determination value.
3. The method of claim 1, wherein the high-speed operation/hub size re-determination step associated with a large hub comprises:
determining whether the video tape is near its leading or trailing end while performing high speed tape running operations associated with large hub sizes; and
if the video tape is judged to be near its leading or trailing end, the size of the hub is judged while the running speed of the video tape is reduced.
4. A method as claimed in claim 1 or 3, wherein the high-speed operation/hub size re-determination step associated with a large hub comprises:
calculating the number (Ps) of Capstan Frequency Generator (CFG) signals included in the magnetic recording/reproducing apparatus for a single rotation of the tape reel, and the number (Pt) of CFG signals included in the magnetic recording/reproducing apparatus for a single rotation of the tape reel;
calculating a value "Ps/Pt" using the calculated values Ps and Pt;
the value "Ps/Pt" is compared with a predetermined reference value, thereby determining the hub size of the tape cassette.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960033807A KR100207327B1 (en) | 1996-08-14 | 1996-08-14 | High speed state control method in a video tape recorder |
| KR33807/96 | 1996-08-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1175762A true CN1175762A (en) | 1998-03-11 |
Family
ID=19469654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97116721A Pending CN1175762A (en) | 1996-08-14 | 1997-08-11 | Method for controlling high-speed tape running in magnetie recording/reproducing apparatus |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100207327B1 (en) |
| CN (1) | CN1175762A (en) |
-
1996
- 1996-08-14 KR KR1019960033807A patent/KR100207327B1/en not_active IP Right Cessation
-
1997
- 1997-08-11 CN CN97116721A patent/CN1175762A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR19980014713A (en) | 1998-05-25 |
| KR100207327B1 (en) | 1999-07-15 |
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