CA1039845A - Magnetic tape reproducing system - Google Patents
Magnetic tape reproducing systemInfo
- Publication number
- CA1039845A CA1039845A CA173,612A CA173612A CA1039845A CA 1039845 A CA1039845 A CA 1039845A CA 173612 A CA173612 A CA 173612A CA 1039845 A CA1039845 A CA 1039845A
- Authority
- CA
- Canada
- Prior art keywords
- magnetic tape
- heads
- tape
- reproducing
- disc
- 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
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- Television Signal Processing For Recording (AREA)
Abstract
Magnetic Tape Reproducing System Abstract of the Disclosure A magnetic tape reproducing system for providing a still picture or a slow motion picture. A magnetic tape is provided on which video signals are recorder in successive fields of a unit length in the longitudinal direction of the tape and a plurality of rotary magnetic reproducing heads are placed on the periphery of a rotating disc at equal angular intervals from each other so as to reproduce one complete field of the video signals. The magnetic reproducing heads are ar-ranged so that the distance between the two gaps of two adjacent heads is equal to an intergal multiple of the distance along the tape corresponding to a period of horizontal synchronizing signals contained in the video signals.
Description
~391~4S
_ ~netic Tape Reproducing System Back~3round of the Invention This invention relates to a magnetic tape reproducing system, and more particularly to a magnetic tape reproducing system for reproducing television signals which are recorded longitudinally Oll a magnetic tape in successive fields. ;`
Heretofore, there have been proposed several methods for presenting a still picture or a slow motion picture, for example by reproducing the same field of television signals, which are recorded on a magnetic tape in the longitudinal dir- ` `
ection thereof, a plurality of times successively by a plurality -of rotary reproducing heads. ~`
However, in a conventional magiletic recording and re-producing apparatlls for providing such a still picture by suc cessively reproducing the same field of the video signals, there is a problem that owing to deviation of the horizontal synchronizing signal of the video signal there is caused a skew distortion and it results in poor picture quality.
Therefore, an object of the present invention is to 20- provide a novel and improved magnetic recording and reproducing apparatus for presenting a still picture or a slow motion picture having a better picture quality. -Another object of thP invention is to provide a novelmagnetic tape reproducing system for reproducing a still picture which is stable and has no skew distortion, from the video signals recorded in the longitudinal direction on a magnetic tape in suc-cessive fields.
A further object of the invention is to provide a novel magnetic tape reproducing system for presenting a stable still picture by using a plurality of rotary reproducing heads.
These objec~s are achieved by providing a magnetic tape ~ ' -- 1 . ~ .
. .:: . . ~
, ..... . .
1~39~45 reproducing system according to the present invention, which com-prises a magnetic tape on whic~ video signals are recordea in successive fields of a unit length in the longitudinal direction of said magnetic tape, each field of said video signals containing horizontal synchronizing signals, a rotating disc, a d`riving means for rotating said rotating disc, and a plurality of reproducing magnetic heads which are placed on the periphery of said rotating disc at equal angular intervals relative to each other, each of said plurality of reproducing heads being arranged so as to re-produce one complete field of said video signals and being arrangedso that the distance between two gaps of two adjacent heads is equal to an integral multiple of the distance along the tape cor-responding to a period of said horizontal synchronizing signals.
The integral number is preferably around 262.
Where there are three reproducing rotary magnetic heads, the length of the magnetic tape which is wound around the rotating ~
disc can extend more than 240 degrees around the disc. `
Brief Description of the Drawings These and other objects and features and advantages of the invention will be apparent from a consideration of the following detailed description and reference to the accompanied drawings, wherein: - `
Fig. 1 shows the head assembly of three rotary magnetic heads and the magnetic tape for explaining an embodiment of the invention;
Fig. 2 shows a part of the magnetic tape used in the apparatus according to the invention showing the track pattern of the tape, on which the signals of fields extracted intermittently -from the video signals are recorded successively in the longitudinal direction of the tape by the assembly of three rotary heads shown in Fig. l; and Figs. 3(a) to 3(c) show the patterns of the video signals :: :, .: - . , . .- ~: - -- - ,.- - - . - - ., ~
~l~39845 reproduced from the magnetic tape shown in Fig. 2 by the three rotary magnetic heads, respectively, and Fig. 3(d) shows the pattern :~
of the video signal synthesized from the effective parts of the ., ``'''' '`"~. '.' ''` ;.
-2a- ~ ~
-_. -, . . . . . .. .. . . . . .. . . .
~39845 reproduced video signals 3(a~ to 3(c).
Detailed Description of the Preferred Embodiment Referring to Figs. 1 to 3, an embodiment o~ the invention will be described in detail which uses three rotary magnetic heads.
Fig. 1 shows the relation between the head assembly ;~
having three rotary magnetic heads and a magnetic tape, wherein the magnetic tape designated by a reference numeral 1 is moved in the direction of arrow V by fixed guide rollers 2 and 3. The rotary head assembly 5 comprises a rotary disc 6 and three magnetic heads ~ ~;
4a, 4b and 4c arranged at equal angular intervals of 120 degrees along the periphery of the rotary disc 6, and the disc 6 is rotated in the direction of arrow ~.
The driving means for rotating the rotary disc 6 is a motor M. The moving means for moving the magnetic tape 1 is omitted ~
herewith for simplifying the description. Further, although the `
direction of rotation is optional in the system according to the invention, the following description is for rotation in the dir-ection of the arrow ~. -Referring to Fig. 2, there is shown a track pattern of each of the fields 7a, 7b, 7c and 7d of the video signals which are for one field and which are extracted intermittently from the video signals and recorded successively in the longitudinal direction of the magnetic tape 1 by the three rotary magnetic heads of Fig. 1. In case of Fig. 2 there exists between the two adjacent recorded field patterns a narrow portion where the signal is not recorded. However if the period for sampling one field of the video signal is shortened a little during recording, there exists a portion where parts of the two adjacent fields overlap instead of the portion where no signal exists, as described. However, as will be obvious from the description presented hereinafter, the fundamental operation of the system of the invention is substantially ~ .
, .- , -- . ., , , - .. : - ~
. - ~ : - , - .
~:. . . :. . , . ~ . .
~39~45 the same for both cases described above, i.e. where there is a portion having no signal or where there is an overlapping portion, and so the following description is presented for the case shown in Fig. 2.
Further, in order to provide the recorded track pattern as shown in Fig. 2, it is not necessary to use three rotary magnetic heads. It is of course possible to use a system having one rotary head, two rotary heads or a fixed head.
Figs. 3(a) to 3(c) show the output signals reproduced by the rotary magnetic heads 4a, 4b and 4c, respectively during move-ment of the magnetic tape on which the video signals are recorded as shown in Fig. 2 around the disc 6 having the three rotary mag-netic heads thereon. Fig. 3(d) shows the output signal which is synthesized from the effective parts of each of the reproduced -signals 3(a) to 3(c).
As shown in Fig. 1, the length of the magnetic tape 1 wound around the rotary disc 6 is at least as long as the length of two fields of the recorded video signals shows in Fig. 2, i.e.
the tape extends 240 degrees or more around disc 6. Therefore, each of the signals of Figs. 3(a), 3(b) and 3(c) reproduced by the magnetic heads 4a, 4b and 4c, respectively contains video signal information for one complete field. In Figs. 3(a) to 3(b), -such a complete one field, the field 7b as an example, is in-dicated by hatching.
Fig. 3(d) shows a tr~n of successive fields 7b, one of the fields of the recorded video signal, which is continuously - synthesized for providing a still picture signal. The signal 3(d) is provided by switching the reproduced signals from the magnetic ~-heads 4a, 4b and 4c in turn at the times Al, A2, A3,...., as shown in Fig. 3. As a practical means for obtaining the synthesized signal of Fig. 3(d), for example, the reproduced signals from the rotary magnetic heads 4a, 4b and 4c are taken out of the heads by ~,~ . . .
-9~45 a conventional slip-ring brush or rotary transformers, and on detecting a control signal such as a vertical synchronizing signal contained in each field of the signals, the si~nals ~rom each o~
the magnetic heads are synthesized by driving a well-known suitable switching circuit by that detected control signal.
The signal of Fig. 3(d) is a signal for a still picture of one field, and if the horizontal synchronizing signals in each field are not related correctly and continuously at the times Al, A2, A3, .. when the output signals from each of the magnetic heads are switched, there is caused, as well known, so-called skew distortion which usually results in a poor picture which is dis-torted to the right or left at the upper part of the picture on a monitor TV receiver.
According to the magnetic tape reproducing system of the invention, such a skew distortion can be eliminated by arranging the distance Q along the periphery of the disc 6 between the two adjacent heads of the plurality of reproducing magnetic heads to be n ~n is an integer around 262, for example 262 or 263) times the length corresponding to the period of the horizontal synchronizing signal synchronizing signal. This relation of lengths is accomplished by adjusting the speed of movement of the magnetic tape during re-cording, the rotating speed of the recording magnetic heads and the radial distance thereof, from the center of rotation and the radial distance of the reproducing magnetic heads from the center of rotation thereof, and by relating these values to each other.
This aspect of the invention is described in more detail in the following.
There will first be considered what occurs around the switching time A3 in Fig. 3, that is the junction point A3 bet-ween the still picture signals provided by synthesizing the re-produced signals from each of the rotary magnetic heads 4a, 4b and 4c.
- , :
1~)398~5 At a portion a little before the point A3, the signal of Fig. 3(d) is the output signal from the head 4b, and at a portion a li-ttle after the point A3, the signal of Fig. 3(d) is the output signal from the head 4c. As for the signal of Fig. 3(d) indicated at the point A3, the reproduced signal from the head 4c has a phase delayed with respect to that of the signal reproduced from the head 4b, and the amount of the phase delay corresponds to the distance on the magnetic tape between two points wher the air gaps of the - head tips of the heads 4b and 4c contact the tape, respectively while reproducing. The distance between these two points is des-ignated by Q in Fig. 1. That is, the signal of Fig. 3(d) represents the condition that the signal for the same field is always provided at a phase delayed by an amount corresponding to the distance at each of the connecting points.
Accordingly, when the length Q coincides with integral multiple of the length corresponding to the period of the horizontal synchroni~ing signals, the horizontal synchronizing signals are correctly and continuously related to each of the junction points of the still picture signal 3(d). Therefore, skew distortion is never caused; The same is true for the other junction points Al, A2, A4, ... besides A3.
When, during reproducing, the three rotary magnetic heads 4a, 4b, and 4c in Fig. 1 are arranged correctly at the equal in-tervals of 120 degrees, the above mentioned length Q between the two points where the air gaps of the head tips of each two adjacent magnetic heads contact with the magnetic tape is expressed as fol-lows:
Q = ~ ................... (1) wherein yp is the radial distance of the reproducing rotary magnetic heads from the center of rotation. On the other hand, the mutual speed of the magnetic tape and the rotary magnetic heads is expressed : - .
1ยข)3984S
as (~RyR ~ )r in which V~ is the speed of movement of the magnetic tape during recording, ~ is the speed of rotation of the recording rotary magnetic heads and YR is the radial distance thereof from the center of rotation. Therefore, for hori~ontal synchronizing signals having a period TH, the signals in that per.iod T~I are recorded on the magnetic tape in a length of (~RY~ ~ VR)TH-For the condition for removing skew distortion, that isfor making the length Q equal to an integral multipl.e of the length corresponding to the period of the horizontal synchronizing signals, the following equation must be satisfied:
_ ~netic Tape Reproducing System Back~3round of the Invention This invention relates to a magnetic tape reproducing system, and more particularly to a magnetic tape reproducing system for reproducing television signals which are recorded longitudinally Oll a magnetic tape in successive fields. ;`
Heretofore, there have been proposed several methods for presenting a still picture or a slow motion picture, for example by reproducing the same field of television signals, which are recorded on a magnetic tape in the longitudinal dir- ` `
ection thereof, a plurality of times successively by a plurality -of rotary reproducing heads. ~`
However, in a conventional magiletic recording and re-producing apparatlls for providing such a still picture by suc cessively reproducing the same field of the video signals, there is a problem that owing to deviation of the horizontal synchronizing signal of the video signal there is caused a skew distortion and it results in poor picture quality.
Therefore, an object of the present invention is to 20- provide a novel and improved magnetic recording and reproducing apparatus for presenting a still picture or a slow motion picture having a better picture quality. -Another object of thP invention is to provide a novelmagnetic tape reproducing system for reproducing a still picture which is stable and has no skew distortion, from the video signals recorded in the longitudinal direction on a magnetic tape in suc-cessive fields.
A further object of the invention is to provide a novel magnetic tape reproducing system for presenting a stable still picture by using a plurality of rotary reproducing heads.
These objec~s are achieved by providing a magnetic tape ~ ' -- 1 . ~ .
. .:: . . ~
, ..... . .
1~39~45 reproducing system according to the present invention, which com-prises a magnetic tape on whic~ video signals are recordea in successive fields of a unit length in the longitudinal direction of said magnetic tape, each field of said video signals containing horizontal synchronizing signals, a rotating disc, a d`riving means for rotating said rotating disc, and a plurality of reproducing magnetic heads which are placed on the periphery of said rotating disc at equal angular intervals relative to each other, each of said plurality of reproducing heads being arranged so as to re-produce one complete field of said video signals and being arrangedso that the distance between two gaps of two adjacent heads is equal to an integral multiple of the distance along the tape cor-responding to a period of said horizontal synchronizing signals.
The integral number is preferably around 262.
Where there are three reproducing rotary magnetic heads, the length of the magnetic tape which is wound around the rotating ~
disc can extend more than 240 degrees around the disc. `
Brief Description of the Drawings These and other objects and features and advantages of the invention will be apparent from a consideration of the following detailed description and reference to the accompanied drawings, wherein: - `
Fig. 1 shows the head assembly of three rotary magnetic heads and the magnetic tape for explaining an embodiment of the invention;
Fig. 2 shows a part of the magnetic tape used in the apparatus according to the invention showing the track pattern of the tape, on which the signals of fields extracted intermittently -from the video signals are recorded successively in the longitudinal direction of the tape by the assembly of three rotary heads shown in Fig. l; and Figs. 3(a) to 3(c) show the patterns of the video signals :: :, .: - . , . .- ~: - -- - ,.- - - . - - ., ~
~l~39845 reproduced from the magnetic tape shown in Fig. 2 by the three rotary magnetic heads, respectively, and Fig. 3(d) shows the pattern :~
of the video signal synthesized from the effective parts of the ., ``'''' '`"~. '.' ''` ;.
-2a- ~ ~
-_. -, . . . . . .. .. . . . . .. . . .
~39845 reproduced video signals 3(a~ to 3(c).
Detailed Description of the Preferred Embodiment Referring to Figs. 1 to 3, an embodiment o~ the invention will be described in detail which uses three rotary magnetic heads.
Fig. 1 shows the relation between the head assembly ;~
having three rotary magnetic heads and a magnetic tape, wherein the magnetic tape designated by a reference numeral 1 is moved in the direction of arrow V by fixed guide rollers 2 and 3. The rotary head assembly 5 comprises a rotary disc 6 and three magnetic heads ~ ~;
4a, 4b and 4c arranged at equal angular intervals of 120 degrees along the periphery of the rotary disc 6, and the disc 6 is rotated in the direction of arrow ~.
The driving means for rotating the rotary disc 6 is a motor M. The moving means for moving the magnetic tape 1 is omitted ~
herewith for simplifying the description. Further, although the `
direction of rotation is optional in the system according to the invention, the following description is for rotation in the dir-ection of the arrow ~. -Referring to Fig. 2, there is shown a track pattern of each of the fields 7a, 7b, 7c and 7d of the video signals which are for one field and which are extracted intermittently from the video signals and recorded successively in the longitudinal direction of the magnetic tape 1 by the three rotary magnetic heads of Fig. 1. In case of Fig. 2 there exists between the two adjacent recorded field patterns a narrow portion where the signal is not recorded. However if the period for sampling one field of the video signal is shortened a little during recording, there exists a portion where parts of the two adjacent fields overlap instead of the portion where no signal exists, as described. However, as will be obvious from the description presented hereinafter, the fundamental operation of the system of the invention is substantially ~ .
, .- , -- . ., , , - .. : - ~
. - ~ : - , - .
~:. . . :. . , . ~ . .
~39~45 the same for both cases described above, i.e. where there is a portion having no signal or where there is an overlapping portion, and so the following description is presented for the case shown in Fig. 2.
Further, in order to provide the recorded track pattern as shown in Fig. 2, it is not necessary to use three rotary magnetic heads. It is of course possible to use a system having one rotary head, two rotary heads or a fixed head.
Figs. 3(a) to 3(c) show the output signals reproduced by the rotary magnetic heads 4a, 4b and 4c, respectively during move-ment of the magnetic tape on which the video signals are recorded as shown in Fig. 2 around the disc 6 having the three rotary mag-netic heads thereon. Fig. 3(d) shows the output signal which is synthesized from the effective parts of each of the reproduced -signals 3(a) to 3(c).
As shown in Fig. 1, the length of the magnetic tape 1 wound around the rotary disc 6 is at least as long as the length of two fields of the recorded video signals shows in Fig. 2, i.e.
the tape extends 240 degrees or more around disc 6. Therefore, each of the signals of Figs. 3(a), 3(b) and 3(c) reproduced by the magnetic heads 4a, 4b and 4c, respectively contains video signal information for one complete field. In Figs. 3(a) to 3(b), -such a complete one field, the field 7b as an example, is in-dicated by hatching.
Fig. 3(d) shows a tr~n of successive fields 7b, one of the fields of the recorded video signal, which is continuously - synthesized for providing a still picture signal. The signal 3(d) is provided by switching the reproduced signals from the magnetic ~-heads 4a, 4b and 4c in turn at the times Al, A2, A3,...., as shown in Fig. 3. As a practical means for obtaining the synthesized signal of Fig. 3(d), for example, the reproduced signals from the rotary magnetic heads 4a, 4b and 4c are taken out of the heads by ~,~ . . .
-9~45 a conventional slip-ring brush or rotary transformers, and on detecting a control signal such as a vertical synchronizing signal contained in each field of the signals, the si~nals ~rom each o~
the magnetic heads are synthesized by driving a well-known suitable switching circuit by that detected control signal.
The signal of Fig. 3(d) is a signal for a still picture of one field, and if the horizontal synchronizing signals in each field are not related correctly and continuously at the times Al, A2, A3, .. when the output signals from each of the magnetic heads are switched, there is caused, as well known, so-called skew distortion which usually results in a poor picture which is dis-torted to the right or left at the upper part of the picture on a monitor TV receiver.
According to the magnetic tape reproducing system of the invention, such a skew distortion can be eliminated by arranging the distance Q along the periphery of the disc 6 between the two adjacent heads of the plurality of reproducing magnetic heads to be n ~n is an integer around 262, for example 262 or 263) times the length corresponding to the period of the horizontal synchronizing signal synchronizing signal. This relation of lengths is accomplished by adjusting the speed of movement of the magnetic tape during re-cording, the rotating speed of the recording magnetic heads and the radial distance thereof, from the center of rotation and the radial distance of the reproducing magnetic heads from the center of rotation thereof, and by relating these values to each other.
This aspect of the invention is described in more detail in the following.
There will first be considered what occurs around the switching time A3 in Fig. 3, that is the junction point A3 bet-ween the still picture signals provided by synthesizing the re-produced signals from each of the rotary magnetic heads 4a, 4b and 4c.
- , :
1~)398~5 At a portion a little before the point A3, the signal of Fig. 3(d) is the output signal from the head 4b, and at a portion a li-ttle after the point A3, the signal of Fig. 3(d) is the output signal from the head 4c. As for the signal of Fig. 3(d) indicated at the point A3, the reproduced signal from the head 4c has a phase delayed with respect to that of the signal reproduced from the head 4b, and the amount of the phase delay corresponds to the distance on the magnetic tape between two points wher the air gaps of the - head tips of the heads 4b and 4c contact the tape, respectively while reproducing. The distance between these two points is des-ignated by Q in Fig. 1. That is, the signal of Fig. 3(d) represents the condition that the signal for the same field is always provided at a phase delayed by an amount corresponding to the distance at each of the connecting points.
Accordingly, when the length Q coincides with integral multiple of the length corresponding to the period of the horizontal synchroni~ing signals, the horizontal synchronizing signals are correctly and continuously related to each of the junction points of the still picture signal 3(d). Therefore, skew distortion is never caused; The same is true for the other junction points Al, A2, A4, ... besides A3.
When, during reproducing, the three rotary magnetic heads 4a, 4b, and 4c in Fig. 1 are arranged correctly at the equal in-tervals of 120 degrees, the above mentioned length Q between the two points where the air gaps of the head tips of each two adjacent magnetic heads contact with the magnetic tape is expressed as fol-lows:
Q = ~ ................... (1) wherein yp is the radial distance of the reproducing rotary magnetic heads from the center of rotation. On the other hand, the mutual speed of the magnetic tape and the rotary magnetic heads is expressed : - .
1ยข)3984S
as (~RyR ~ )r in which V~ is the speed of movement of the magnetic tape during recording, ~ is the speed of rotation of the recording rotary magnetic heads and YR is the radial distance thereof from the center of rotation. Therefore, for hori~ontal synchronizing signals having a period TH, the signals in that per.iod T~I are recorded on the magnetic tape in a length of (~RY~ ~ VR)TH-For the condition for removing skew distortion, that isfor making the length Q equal to an integral multipl.e of the length corresponding to the period of the horizontal synchronizing signals, the following equation must be satisfied:
2~yp = n(~R~R + VR)TH ---........... (2) in which n is an optional integer. As the period of the signal ;
for one field is around 262, it is of course desirable that n be an integer around 262, for example 261, 262 or 263.
The above equation (2) is of couxse also applicable for the case in which the speed VR of the magnetic tape during re-cording is zero, and for a fixed head system ~here YR is zero. ~-Further, although in the above embodiment the description has been for the case in which the switching of the reproduced ::
signals from each of the magnetic heads is carried out, as will ~;
be obvious from Fig. 3(d), in the same field of the reproduced signal, other ways are also possible for satisfying the above -.. .
conaition. For example, when recording the signals of one field extracte~ by sampling on the magnetic tape, a signal a little longer than one field may be recorded, or it is also of course possible that during reproducing the value of n in the equation (2) may be set to a value smaller than 262. Although the still picture signal provided in such a way is not a signal of the normal standard TV system used in Japan or the U. S. A., it does not cause any trouble during the di.splay of the si.gnal on a conventional -, ' ' ~ - .~.: `
monitor TV receiver. 1~3984S
Further, although the system has been described herein-before for three rotary magnetic heads, the subject of the in-vention can be used with other optional members of rotary heads.
There has been described hereinbefore a preferred em-bodiment of the invention, and it is apparent that various modi-fications may be made without departing from the spirit and scope of the invention which is defined by the following claims.
for one field is around 262, it is of course desirable that n be an integer around 262, for example 261, 262 or 263.
The above equation (2) is of couxse also applicable for the case in which the speed VR of the magnetic tape during re-cording is zero, and for a fixed head system ~here YR is zero. ~-Further, although in the above embodiment the description has been for the case in which the switching of the reproduced ::
signals from each of the magnetic heads is carried out, as will ~;
be obvious from Fig. 3(d), in the same field of the reproduced signal, other ways are also possible for satisfying the above -.. .
conaition. For example, when recording the signals of one field extracte~ by sampling on the magnetic tape, a signal a little longer than one field may be recorded, or it is also of course possible that during reproducing the value of n in the equation (2) may be set to a value smaller than 262. Although the still picture signal provided in such a way is not a signal of the normal standard TV system used in Japan or the U. S. A., it does not cause any trouble during the di.splay of the si.gnal on a conventional -, ' ' ~ - .~.: `
monitor TV receiver. 1~3984S
Further, although the system has been described herein-before for three rotary magnetic heads, the subject of the in-vention can be used with other optional members of rotary heads.
There has been described hereinbefore a preferred em-bodiment of the invention, and it is apparent that various modi-fications may be made without departing from the spirit and scope of the invention which is defined by the following claims.
Claims (2)
1. A magnetic tape reproducing system comprising a magnetic tape on which video signals are recorded in successive fields of a unit length in the longitudinal direction of said magnetic tape, each field of said video signals containing horizontal synchronizing signals, a rotating disc, a driving means coupled to said disc for rotating said rotating disc, a plurality of reproducing magnetic heads on the periphery of said rotating disc at equal angular intervals from each other, each of said plurality of reproducing heads being for reproducing a quasi-complete one field of said video signals, and means for continuously moving said tape around said disc past said heads, all the distances on the periphery of said disc between the gaps of two adjacent heads at the relative speed of the tape and the disc being equal to each other and equal to an integral multiple of the distance (.omega.RrR+VR)TH along said tape corresponding to the length on the tape of said horizintal synchronizing signals, said integral multiple being around 262, .omega.R being the speed of rotation of the recording heads for recording the signals, rR
being the radial distance of each recording head from the center of rotation thereof during recording, VR being the speed of the magnetic tape during recording, and TH being the period of said horizontal synchronizing signals.
being the radial distance of each recording head from the center of rotation thereof during recording, VR being the speed of the magnetic tape during recording, and TH being the period of said horizontal synchronizing signals.
2. A magnetic tape reproducing system as claimed in claim 1, wherein there are three of said reproducing rotary magnetic heads and the length of said magnetic tape which is wound around said rotating disc extends more than 240 degrees around said disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA173,612A CA1039845A (en) | 1973-06-08 | 1973-06-08 | Magnetic tape reproducing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA173,612A CA1039845A (en) | 1973-06-08 | 1973-06-08 | Magnetic tape reproducing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1039845A true CA1039845A (en) | 1978-10-03 |
Family
ID=4096954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA173,612A Expired CA1039845A (en) | 1973-06-08 | 1973-06-08 | Magnetic tape reproducing system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1039845A (en) |
-
1973
- 1973-06-08 CA CA173,612A patent/CA1039845A/en not_active Expired
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