CA1152211A - Method for recording information signal and control signal - Google Patents
Method for recording information signal and control signalInfo
- Publication number
- CA1152211A CA1152211A CA000269560A CA269560A CA1152211A CA 1152211 A CA1152211 A CA 1152211A CA 000269560 A CA000269560 A CA 000269560A CA 269560 A CA269560 A CA 269560A CA 1152211 A CA1152211 A CA 1152211A
- Authority
- CA
- Canada
- Prior art keywords
- track
- main
- tracks
- recorded
- guard band
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000000875 corresponding effect Effects 0.000 claims description 15
- 229920000136 polysorbate Polymers 0.000 claims 1
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/30—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture with provision for auxiliary signals
- G11B23/36—Signals on record carriers or on containers and recorded by the same method as the main recording
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/488—Disposition of heads
- G11B5/4893—Disposition of heads relative to moving tape
Abstract
METHOD FOR RECORDING INFORMATION
SIGNAL AND CONTROL SIGNAL
ABSTRACT OF THE DISCLOSURE
A first main information signal is recorded in a first track extending longitudinally along one side of a length of magnetic tape and a corresponding first secondary, or control, signal is recorded in a narrow parallel track spaced from the first main track. A second main signal is recorded in a third track within the other half of the tape, and a corresponding second secondary, or control, signal is re-corded between the first secondary signal and the first main signal, whereby the two main signals and the two secondary signals are interleaved with each other. The first and second main tracks are equal in width, and the first and second secondary tracks are also equal in width but are much narrower than the first and second main tracks. If desired, the first and second main tracks can each be divided into first and second sub-main tracks to permit two channel record-ing with a control track in each direction but with each con-trol, or secondary, track being separated from its own nearest subtrack by a distance equal to the width of the other second-ary track plus two guardbands, one on each side of the other secondary track.
SIGNAL AND CONTROL SIGNAL
ABSTRACT OF THE DISCLOSURE
A first main information signal is recorded in a first track extending longitudinally along one side of a length of magnetic tape and a corresponding first secondary, or control, signal is recorded in a narrow parallel track spaced from the first main track. A second main signal is recorded in a third track within the other half of the tape, and a corresponding second secondary, or control, signal is re-corded between the first secondary signal and the first main signal, whereby the two main signals and the two secondary signals are interleaved with each other. The first and second main tracks are equal in width, and the first and second secondary tracks are also equal in width but are much narrower than the first and second main tracks. If desired, the first and second main tracks can each be divided into first and second sub-main tracks to permit two channel record-ing with a control track in each direction but with each con-trol, or secondary, track being separated from its own nearest subtrack by a distance equal to the width of the other second-ary track plus two guardbands, one on each side of the other secondary track.
Description
~5Z~
This invention relates to a method for recording an information signal and a control signal on a magnetic tape.
Usually, control signals are used to maintain the tape at the constant speed, or to search the desired portion of the ~ape by counting the control signals. In a conventional tape recorder, the control signal is recorded at the edges of the tape, so that if the moving tape fluctuates a little in the transverse direction, contact of the control head with the control track is apt to become unstable, and to make matters worse the head disengages from the track. Therefore, there is a disadvantage that drop-out of the control signal frequently occurs in the reproduced signal.
In order to overcome the above-described disadvantage, there has been proposed to arrange the control track at the center of the tape. That is, a pair of control tracks are formed between the information tracks. It should be noted that one control track is formed adjacent to one information track corresponding thereto. Consequently, the information track and the control track are disposed close together, so that the cross-talk between the tracks cannot be ignored.
Also the construction of magnetic head used therefor becomes more critical as the guardband therebetween becomes narrower.
According to one aspect of the invention there is provided a method for recording main signals and sub-signals corresponding to said main signals in the longitudinal direction of a recording medium comprising, forming at least first and second main tracks, in which said main signals are recorded;
forming at least first and second sub-tracks corresponding to said respective main tracks, in which said sub-signals are recorded; said recording method being characterized by forming said sub-tracks such that one sub-track corresponding to one 23~1 main track is interposed between another main track and another sub-track corresponding to another main track.
Accordingly, one object of this invention is to provide a new method for recording the control signal which overcomes the bove-described disadvantage.
The invention in a more particular aspect provides a method of recording a plurality of main signals and a corresponding plurality of secondary signals of a control nature related to said main signal6, said main signals and said secondary signals being recorded in parallel tracks on a record-ing medium, said method comprising the steps of:
recording at least one first main track and a corres-ponding first secondary track spaced apart from each other, said first main track being wider than said corresponding secondary track; and recording at least one second main track and a second secondary track also spaced apart from each other, said second main track being wider than ~aid second secondary track, said first secondary track being recorded in the space between said second secondary track and said second main track and said second secondary track being recorded in the space between said first secondary track and said first main track, with all of said tracks being separated from each other by guardbands.
Fig. 1 shows one t~pe pattorn of the prior art.
Fig. 2 shows another tape pattern of the prior art.
Fig. 3 shows one embodiment of tape pattern which is recorded in accordance with the method of this invention.
Fig. 4 shows a magnetic head which is for use with the method of ~his invention.
Fig. 5 shows another embodiment of tape pattern nd -la-.. ~ .,~.. . . .. ...... ...
magnetic heads according to this invention.
Fig. 1 shows the tape pattern of the prior art, in which the information signal and the control signal are re-corded by the conventional tape recorder. In Fig. 1, the tape 1 is provided with a forward track 2, in which the information signal is recorded during the tape movement in the forward di-rection, shown by arrow A, and a reverse track 3, in which the information signal is recorded during the tape movement in the reverse direction, shown by arrow B. Further, in the tape 1, a pair of control tracks 4 and 5 are formed at the side edges thereof. The control or cue signals corresponding to the in-formation signal recorded in the track 2 are recorded in the track 4, while the control or cue signals corresponding to the information signal recorded in the track 5 are recorded in the track 3. Herein, it should be noted that the width of the con-trol tracks 4 and 5 must be extremely narrow, for example 0.2 mm, if the tape width is 6.3 mm, (1/4 inch), which is equal to the tape width of the tape used in the conventional open-reel type tape recorder. Therefore, it is apparent that if the tape fluctuates or vibrates upon moving, the contact of the head with the control track will be unstable owing to the fluc-tuation thereof, and thereby drop-out of the control signal may occur frequently in the reproduced control signal.
In order to overcome the above-described disadvan-tage, it is proposed to form control tracks at the center of tape, as shown in Fig. 2. In Fig. 2, the control track 14 corresponding to the information track 12 is formed between the information track 12 and control track 15 and the informa-tion track 12, while the control track 15 corresponding to the information track 13 is formed between the control track 14 and the information track 13.
Assuming that the tape width D is 6.3 mm and the
This invention relates to a method for recording an information signal and a control signal on a magnetic tape.
Usually, control signals are used to maintain the tape at the constant speed, or to search the desired portion of the ~ape by counting the control signals. In a conventional tape recorder, the control signal is recorded at the edges of the tape, so that if the moving tape fluctuates a little in the transverse direction, contact of the control head with the control track is apt to become unstable, and to make matters worse the head disengages from the track. Therefore, there is a disadvantage that drop-out of the control signal frequently occurs in the reproduced signal.
In order to overcome the above-described disadvantage, there has been proposed to arrange the control track at the center of the tape. That is, a pair of control tracks are formed between the information tracks. It should be noted that one control track is formed adjacent to one information track corresponding thereto. Consequently, the information track and the control track are disposed close together, so that the cross-talk between the tracks cannot be ignored.
Also the construction of magnetic head used therefor becomes more critical as the guardband therebetween becomes narrower.
According to one aspect of the invention there is provided a method for recording main signals and sub-signals corresponding to said main signals in the longitudinal direction of a recording medium comprising, forming at least first and second main tracks, in which said main signals are recorded;
forming at least first and second sub-tracks corresponding to said respective main tracks, in which said sub-signals are recorded; said recording method being characterized by forming said sub-tracks such that one sub-track corresponding to one 23~1 main track is interposed between another main track and another sub-track corresponding to another main track.
Accordingly, one object of this invention is to provide a new method for recording the control signal which overcomes the bove-described disadvantage.
The invention in a more particular aspect provides a method of recording a plurality of main signals and a corresponding plurality of secondary signals of a control nature related to said main signal6, said main signals and said secondary signals being recorded in parallel tracks on a record-ing medium, said method comprising the steps of:
recording at least one first main track and a corres-ponding first secondary track spaced apart from each other, said first main track being wider than said corresponding secondary track; and recording at least one second main track and a second secondary track also spaced apart from each other, said second main track being wider than ~aid second secondary track, said first secondary track being recorded in the space between said second secondary track and said second main track and said second secondary track being recorded in the space between said first secondary track and said first main track, with all of said tracks being separated from each other by guardbands.
Fig. 1 shows one t~pe pattorn of the prior art.
Fig. 2 shows another tape pattern of the prior art.
Fig. 3 shows one embodiment of tape pattern which is recorded in accordance with the method of this invention.
Fig. 4 shows a magnetic head which is for use with the method of ~his invention.
Fig. 5 shows another embodiment of tape pattern nd -la-.. ~ .,~.. . . .. ...... ...
magnetic heads according to this invention.
Fig. 1 shows the tape pattern of the prior art, in which the information signal and the control signal are re-corded by the conventional tape recorder. In Fig. 1, the tape 1 is provided with a forward track 2, in which the information signal is recorded during the tape movement in the forward di-rection, shown by arrow A, and a reverse track 3, in which the information signal is recorded during the tape movement in the reverse direction, shown by arrow B. Further, in the tape 1, a pair of control tracks 4 and 5 are formed at the side edges thereof. The control or cue signals corresponding to the in-formation signal recorded in the track 2 are recorded in the track 4, while the control or cue signals corresponding to the information signal recorded in the track 5 are recorded in the track 3. Herein, it should be noted that the width of the con-trol tracks 4 and 5 must be extremely narrow, for example 0.2 mm, if the tape width is 6.3 mm, (1/4 inch), which is equal to the tape width of the tape used in the conventional open-reel type tape recorder. Therefore, it is apparent that if the tape fluctuates or vibrates upon moving, the contact of the head with the control track will be unstable owing to the fluc-tuation thereof, and thereby drop-out of the control signal may occur frequently in the reproduced control signal.
In order to overcome the above-described disadvan-tage, it is proposed to form control tracks at the center of tape, as shown in Fig. 2. In Fig. 2, the control track 14 corresponding to the information track 12 is formed between the information track 12 and control track 15 and the informa-tion track 12, while the control track 15 corresponding to the information track 13 is formed between the control track 14 and the information track 13.
Assuming that the tape width D is 6.3 mm and the
-2-.
~S~211 widths d2 of the information tracks 12 and 13 are 2.55 mm, the width dl between the tracks 12 and 13 becomes approximately 1.05 mm, and therefore the width d3 of the control tracks 14 and 15, the width d4 between the control tracks 14 and 15 and the the width d5 between the control track and the information track are selected to be 0.2 mm, 0.2 mm and 0.225 mm, respectively.
Generally, a combination head is used in the tape recorder for recording or reproducing both the information signal and the control signal simultaneously. However, if the information track and the control track are formed close to each other, as described above, the head cores of the information head and the control head must be disposed adjacent to each other and thereby the magnetic coupling generated between the head cores will cause a crosstalk which deteriorates the reproduced information signal.
Therefore, in one embodiment according to this invention, as shown in Fig. 3, the control track 15 is used as the control track for the information track 12, while the control track 14 is used as the control track for the information track 13. That is, the control tracks are disposed such that the control track to one information track is inter-posed between other control track and other information track.
With the tape pattern thus constructed, as shown in Fig. 4, the combination magnetic head 16 which records or reproduces the information signal and the control signal with the tape pattern shown in Fig. 3. The head is provided with a gap 17 for recording of the information signal and a head gap 18 for recording of the control signal. These gaps are separated by a fairly large distance d7. The distance d7 is counted as d5 + d3 + d4 and, in the above numeral example, 0.625 mm.
._ ~152~1 The provision of the distance d7 brings some advantages.
Firstly, the construction of the combination magnetic head becomes relatively easy, and secondly the crosstalk between the head cores is reduced to a great extent.
Fig. 5A shows another embodiment of a tape pattern recorded by method of this invention, in which each information track is divided into two channels. That is, the information tracks 12 and 13 are divided into two subtracks 12a, 12b and 13a, 13b, respectively. In this example, the width d8 of the sub$track~ and the width d9 of the guardband between the sub- -tracks are selected to be 1.1 mm and 0.35 mm, respectively.
Fig. 5B shows a combination magnetic head 19 having multi gaps 21 and 22l for recording or reproducing of the information signal and a gap 23 for recording or reproducing of the control signal, and are mounted at a predetermined distance d7 apart on the head shell 19.
Fig. 5C also shows an erasing head having a gap 24 of gap width d2 for erasing of the information signal and a gap 25 of gap width d3 for erasing of the control signal, which are mounted at a predetermined distance apart d7 on the head shell 20.
~S~211 widths d2 of the information tracks 12 and 13 are 2.55 mm, the width dl between the tracks 12 and 13 becomes approximately 1.05 mm, and therefore the width d3 of the control tracks 14 and 15, the width d4 between the control tracks 14 and 15 and the the width d5 between the control track and the information track are selected to be 0.2 mm, 0.2 mm and 0.225 mm, respectively.
Generally, a combination head is used in the tape recorder for recording or reproducing both the information signal and the control signal simultaneously. However, if the information track and the control track are formed close to each other, as described above, the head cores of the information head and the control head must be disposed adjacent to each other and thereby the magnetic coupling generated between the head cores will cause a crosstalk which deteriorates the reproduced information signal.
Therefore, in one embodiment according to this invention, as shown in Fig. 3, the control track 15 is used as the control track for the information track 12, while the control track 14 is used as the control track for the information track 13. That is, the control tracks are disposed such that the control track to one information track is inter-posed between other control track and other information track.
With the tape pattern thus constructed, as shown in Fig. 4, the combination magnetic head 16 which records or reproduces the information signal and the control signal with the tape pattern shown in Fig. 3. The head is provided with a gap 17 for recording of the information signal and a head gap 18 for recording of the control signal. These gaps are separated by a fairly large distance d7. The distance d7 is counted as d5 + d3 + d4 and, in the above numeral example, 0.625 mm.
._ ~152~1 The provision of the distance d7 brings some advantages.
Firstly, the construction of the combination magnetic head becomes relatively easy, and secondly the crosstalk between the head cores is reduced to a great extent.
Fig. 5A shows another embodiment of a tape pattern recorded by method of this invention, in which each information track is divided into two channels. That is, the information tracks 12 and 13 are divided into two subtracks 12a, 12b and 13a, 13b, respectively. In this example, the width d8 of the sub$track~ and the width d9 of the guardband between the sub- -tracks are selected to be 1.1 mm and 0.35 mm, respectively.
Fig. 5B shows a combination magnetic head 19 having multi gaps 21 and 22l for recording or reproducing of the information signal and a gap 23 for recording or reproducing of the control signal, and are mounted at a predetermined distance d7 apart on the head shell 19.
Fig. 5C also shows an erasing head having a gap 24 of gap width d2 for erasing of the information signal and a gap 25 of gap width d3 for erasing of the control signal, which are mounted at a predetermined distance apart d7 on the head shell 20.
Claims (5)
1. The method of recording a plurality of main signals and a corresponding plurality of secondary signals of a control nature related to said main signals, said main sig-nals and said secondary signals being recorded in parallel tracks on a recording medium, said method comprising the steps of:
recording at least one first main track and a cor-responding first secondary track spaced apart from each other, said first main track being wider than said corresponding secondary track; and recording at least one second main track and a second secondary track also spaced apart from each other, said second main track being wider than said second secondary track, said first secondary track being recorded in the space between said second secondary track and said second main track and said second secondary track being recorded in the space be-tween said first secondary track and said first main track, with all of said tracks being separated from each other by guardbands, said at least one first and second main tracks each being divided longitudinally into at least first and second sub-main tracks spaced apart from each other by an additional guardband distance, said first and second secondary tracks being recorded in the space between the proximal edges of the sub-main tracks closest to each other, and said first main track and said second secondary track being recorded with spacings of mirror symmetry with re-spect to said second main track and said first secondary track, the line of symmetry being centered between said first and second secondary tracks.
recording at least one first main track and a cor-responding first secondary track spaced apart from each other, said first main track being wider than said corresponding secondary track; and recording at least one second main track and a second secondary track also spaced apart from each other, said second main track being wider than said second secondary track, said first secondary track being recorded in the space between said second secondary track and said second main track and said second secondary track being recorded in the space be-tween said first secondary track and said first main track, with all of said tracks being separated from each other by guardbands, said at least one first and second main tracks each being divided longitudinally into at least first and second sub-main tracks spaced apart from each other by an additional guardband distance, said first and second secondary tracks being recorded in the space between the proximal edges of the sub-main tracks closest to each other, and said first main track and said second secondary track being recorded with spacings of mirror symmetry with re-spect to said second main track and said first secondary track, the line of symmetry being centered between said first and second secondary tracks.
2. The method according to claim 1 in which said secondary tracks are recorded with a first guard band between them, a second guard band between said first main track and said second secondary track, and a third guard band between said second main track and said first secondary track, the width of said first guard band being narrower than the width of either of said second or third guard bands.
3. The method according to claim 1 in which the guard bands defined by the spacing between the two sub-tracks into which each said main track is divided are wider than the guard band between each of said secondary tracks and the edge of the next adjacent sub-track of a main track.
4. The method of claim 1 in which said recording medium is magnetic tape and all of said tracks are recorded longitudin-ally along said tape, said method comprising the additional steps of:
moving said tape longitudinally in a first direction while recording said first main track and said first secondary track; and moving said tape in the opposite direction during the recording of said second main track and said second secondary track.
moving said tape longitudinally in a first direction while recording said first main track and said first secondary track; and moving said tape in the opposite direction during the recording of said second main track and said second secondary track.
5. The method according to claim 4 in which said first and second secondary tracks are recorded with a first guard band spacing between them, said first secondary track being recorded with a second guard band spacing between itself and said first main track, said second secondary track being recorded with said second guard band spacing between itself and said second main track, said first guard band being narrower than said second guard band.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7428/76 | 1976-01-26 | ||
| JP1976007428U JPS5299303U (en) | 1976-01-26 | 1976-01-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1152211A true CA1152211A (en) | 1983-08-16 |
Family
ID=11665585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000269560A Expired CA1152211A (en) | 1976-01-26 | 1977-01-12 | Method for recording information signal and control signal |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4121264A (en) |
| JP (1) | JPS5299303U (en) |
| AT (1) | AT356401B (en) |
| AU (1) | AU502879B2 (en) |
| CA (1) | CA1152211A (en) |
| DE (1) | DE2702971A1 (en) |
| FR (1) | FR2339208A1 (en) |
| GB (1) | GB1512192A (en) |
| IT (1) | IT1065762B (en) |
| NL (1) | NL188312C (en) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4321633A (en) * | 1978-10-09 | 1982-03-23 | Olympus Optical Co. Ltd. | Tape recorder |
| JPS5651070A (en) * | 1979-09-29 | 1981-05-08 | Toshiba Corp | Magnetic tape device |
| CA1161946A (en) * | 1980-07-26 | 1984-02-07 | Sony Corporation | Method and apparatus for recording digitized information on a record medium |
| JPS5786178A (en) * | 1980-11-18 | 1982-05-29 | Sony Corp | Magnetic recording system |
| DE3045380A1 (en) * | 1980-12-02 | 1982-07-01 | Blaupunkt-Werke Gmbh, 3200 Hildesheim | METHOD AND DEVICE FOR STORING AND LISTENING TO TRAFFIC INFORMATION |
| US4393414A (en) * | 1981-03-09 | 1983-07-12 | Rca Corporation | Horizontal-rate phase-change of TV pixel distribution among multiple recorder tracks for dropout concealment |
| US4423444A (en) * | 1981-06-30 | 1983-12-27 | Humphreys John L | Method for recording a magnetic audio tape and apparatus for generating a television signal from the recorded magnetic audio tape |
| JPS5846751A (en) * | 1981-09-11 | 1983-03-18 | Sony Corp | Binary code modulating method and recording medium and its reproducer |
| US4843485A (en) * | 1983-12-23 | 1989-06-27 | General Electric Company | Multiple format digital video tape record and replay system |
| US4692818A (en) * | 1984-02-01 | 1987-09-08 | Olympus Optical Co., Ltd. | Dual audio track recording system in which one track also contains a control signal |
| GB8414657D0 (en) * | 1984-06-08 | 1984-07-11 | Sony Corp | Digital video tape recorders |
| GB2165686A (en) * | 1984-10-17 | 1986-04-16 | Ezouri Fuad Akka | A method of and apparatus for tape based sound reproduction |
| US5053891A (en) * | 1984-11-02 | 1991-10-01 | Michael Snodgrass | Method of prerecording tape and apparatus for use therewith |
| US4855844A (en) * | 1984-11-02 | 1989-08-08 | Michael Snodgrass | Method of prerecording tape and apparatus for use therewith |
| JP2547735B2 (en) * | 1986-06-23 | 1996-10-23 | キヤノン株式会社 | Information recording device |
| US6028980A (en) * | 1987-04-13 | 2000-02-22 | Canon Kabushiki Kaisha | Image and sound recording apparatus using a common recording head and audio signal memory |
| US5008765A (en) * | 1989-01-17 | 1991-04-16 | Minnesota Mining And Manufacturing Company | Method and apparatus for reading or writing on tape using a servo positioned multiple channel head |
| JP2693809B2 (en) * | 1989-03-17 | 1997-12-24 | シャープ株式会社 | Image recording and playback device |
| JPH0589405A (en) * | 1991-09-30 | 1993-04-09 | Pioneer Electron Corp | Digital recording and reproducing system |
| JP2531056B2 (en) * | 1991-12-24 | 1996-09-04 | ティアック株式会社 | Data recording method for magnetic tape |
| EP0557552B1 (en) * | 1992-02-26 | 1997-04-16 | Tandberg Data A/S | Method and apparatus for erasing information from a magnetic tape |
| EP0569610B1 (en) * | 1992-05-13 | 1997-03-05 | Tandberg Data A/S | Method and apparatus for determining the tape position for a tape using dedicated servo format |
| DE4392695T1 (en) * | 1992-06-16 | 1994-10-20 | Samsung Electronics Co Ltd | Backwards compatible HDTV recording / playback system |
| JP2901814B2 (en) * | 1992-06-30 | 1999-06-07 | シャープ株式会社 | Magnetic tape unit |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3292168A (en) * | 1962-08-13 | 1966-12-13 | Sperry Rand Corp | High resolution, head positioner system |
| US3469037A (en) * | 1964-08-12 | 1969-09-23 | Iit Res Inst | Magnetic transducer head with single record winding and plural reproduce windings |
| US3539734A (en) * | 1967-03-18 | 1970-11-10 | Teac Corp | Automatic tape recorder operating system |
| US3591730A (en) * | 1968-01-31 | 1971-07-06 | Daniel C Chang | Amplitude sensitive magnetic marking and self-muting mark sensing system |
| US3587180A (en) * | 1969-08-04 | 1971-06-28 | Sueddeutche Mechanische Werkst | Educational device for programmed instruction |
| JPS515287B1 (en) * | 1969-08-27 | 1976-02-19 | ||
| GB1313835A (en) * | 1971-04-20 | 1973-04-18 | Debell L R | Apparatus for playback of plural track records |
| IT952756B (en) * | 1972-04-24 | 1973-07-30 | Del Bolgia F | DEVICE FOR THE AUTOMATIC RETRIEVATION OF SONGS RECORDED ON A MAGNETIC TAPE IN A RECORDER BY MEANS OF RECOGNITION SIGNALS RECORDED RECORDED ON ITSELF |
| JPS5136617B2 (en) * | 1972-07-25 | 1976-10-09 | ||
| US3812533A (en) * | 1972-12-22 | 1974-05-21 | Vermont Res Corp | Information storage unit transducer positioning system |
| US3869719A (en) * | 1973-03-23 | 1975-03-04 | Int Tapetronics Corp | Automatic sequence control for reproducing apparatus |
| US3781490A (en) * | 1973-06-01 | 1973-12-25 | Ibm | Web tension and speed control in a reel-to-reel web transport |
| US3919697A (en) * | 1974-06-26 | 1975-11-11 | Battelle Development Corp | Data record tracking using track identifying information in the gaps between recorded data groups |
| JPS5911964B2 (en) * | 1974-12-10 | 1984-03-19 | 松下電器産業株式会社 | Magnetic recording method |
-
1976
- 1976-01-26 JP JP1976007428U patent/JPS5299303U/ja active Pending
- 1976-12-15 AU AU20564/76A patent/AU502879B2/en not_active Expired
- 1976-12-28 FR FR7639332A patent/FR2339208A1/en active Granted
- 1976-12-29 AT AT978876A patent/AT356401B/en not_active IP Right Cessation
- 1976-12-30 IT IT31031/76A patent/IT1065762B/en active
-
1977
- 1977-01-06 GB GB434/77A patent/GB1512192A/en not_active Expired
- 1977-01-12 CA CA000269560A patent/CA1152211A/en not_active Expired
- 1977-01-25 DE DE19772702971 patent/DE2702971A1/en active Granted
- 1977-01-26 US US05/762,767 patent/US4121264A/en not_active Expired - Lifetime
- 1977-01-26 NL NLAANVRAGE7700802,A patent/NL188312C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NL188312C (en) | 1992-05-18 |
| AU2056476A (en) | 1978-06-22 |
| NL7700802A (en) | 1977-07-28 |
| DE2702971C2 (en) | 1988-09-15 |
| US4121264A (en) | 1978-10-17 |
| AU502879B2 (en) | 1979-08-09 |
| NL188312B (en) | 1991-12-16 |
| JPS5299303U (en) | 1977-07-27 |
| IT1065762B (en) | 1985-03-04 |
| DE2702971A1 (en) | 1977-07-28 |
| GB1512192A (en) | 1978-05-24 |
| FR2339208A1 (en) | 1977-08-19 |
| AT356401B (en) | 1980-04-25 |
| FR2339208B1 (en) | 1983-03-18 |
| ATA978876A (en) | 1979-09-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1152211A (en) | Method for recording information signal and control signal | |
| US5229895A (en) | Multi-track servo recording head assembly | |
| US5426543A (en) | Servo positioning system for magnetic recording media | |
| AU564397B2 (en) | Helical scan tracking control | |
| US6411460B1 (en) | Postponable servo code selection | |
| US5959812A (en) | Fringe field compensation system for multi-track servo recording head | |
| US5235483A (en) | Magnetic head having a groove between high and low track density cores | |
| AU578062B2 (en) | Recording a digital signal | |
| US4414596A (en) | Magnetic head assembly | |
| US5345341A (en) | Method of manufacturing a replicated magnetic reproducing medium, such as a magnetic-tape cassette provided with a music recording, and magnetic replication head and replication arrangement for use in the method | |
| US4131926A (en) | Magnetic tape and recording method therefor | |
| JPH0326442B2 (en) | ||
| EP0561453B1 (en) | Method of manufacturing a replicated magnetic reproduction medium and system comprising the magnetic reproduction medium, a magnetic reproduction head and a replication arrangement | |
| SU1016817A1 (en) | Contact assembly for longitudinal recording of magnetic marker | |
| JPH0636488Y2 (en) | Rotating magnetic head device | |
| KR930017000A (en) | Video signal recording and playback method | |
| JPS58194106A (en) | Azimuth system recorder and reprodlucer | |
| KR870000043B1 (en) | Multi-track complex head | |
| JPH0146922B2 (en) | ||
| US5247411A (en) | Multiple-channel magnetic head having plural magnetic head tips mounted on a single head base | |
| JP2938964B2 (en) | Magnetic head | |
| JPH0517632B2 (en) | ||
| JPS6153763B2 (en) | ||
| JPH07105522A (en) | Recording and reproducing device | |
| GB2279800A (en) | Magnetic head apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |