GB2070887A - Sampled or digitized color moviola in a record and replay system - Google Patents
Sampled or digitized color moviola in a record and replay system Download PDFInfo
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- GB2070887A GB2070887A GB8106329A GB8106329A GB2070887A GB 2070887 A GB2070887 A GB 2070887A GB 8106329 A GB8106329 A GB 8106329A GB 8106329 A GB8106329 A GB 8106329A GB 2070887 A GB2070887 A GB 2070887A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/808—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the composite colour video-signal
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Abstract
Moviola color picture quality is improved for a record and/or replay system wherein video information sampled at a predetermined multiple of the color subcarrier frequency is recorded with each frame or field being disposed on a set of multiple tracks and with only a portion of the recorded information being intended for replay to reconstruct the color moviola signal. Only pixel groups (1-4, 5-8, 9-12, etc) relating to entire color subcarrier cycles are recorded on the tracks (1, 2 or 3) so that a video signal having proper color information can be readily reconstructed therefrom during the moviola mode. In one embodiment, sequential color subcarrier cycle pixel groups (1-4, 5-8, 9-12) are recorded on separate tracks (1, 2, 3) and those (1-4, 13-16, etc) on a single track (1) are replayed during the moviola mode with the pixel groups on the single track repeated in sequence when reconstructing the moviola picture, thereby supplying instantaneously coherent information. <IMAGE>
Description
SPECIFICATION
Sampled or digitized color moviola in a record and
replay system
This invention relates to a color video sampled or digitized record and replay system wherein each video frame or field is recorded on a set of multiple tracks. During the search or moviola mode of this system, the recorded medium is replayed at very high speed and a color video signal relating to a frame or field of reduced quality is reconstructed from only a portion of the information recorded for many frames or fields. Although conventional techniques (discussed later) could be adapted in this system for operating in the moviola mode, the moviola picture resulting from these techniques would be of poor quality.
In accordance with the principles of the present invention, to improve the moviola picture quality, only entire color subcarrier cycles are recorded on the tracks in the record and replay system of this invention so that a video signal can be reconstructed with proper color information. In one preferred embodiment, picture sample (pixel) groups relating to sequential subcarrier cycles are recorded on separate tape tracks in the multiple track set with those pixel groups to be utilized for reconstruction of the video signal during the moviola mode being recorded on a single track and being repeated in sequence a number of times to derive filler information forthe other tracks.A convenient arrangement for recording a color video signal in accordance with this invention includes a buffer memory for each track and a multiplexer through which groups of pixels relating to entire color subcarrier cycles are directed in sequence to the buffer memories. Then pixel information is stored in the buffer memories during each cycle of the multiplexer and simultaneously read out to the tracks at the completion of each multiplexer cycle. A convenient arrangement for replaying a moviola signal in accordance with this invention includes a converter for presenting color subcarrier cycle pixel groups individually from a single track in parallel format with each pixel available from a separate output.A multiplexer having the outputs from the converter applied thereto, is repeatedly cycled to pass each moviola pixel group a number of times equal to the number of tracks in the multiple track set and thereby provide instantaneously coherent information during moviola replay.
In the Drawings:
FIGURE 1 illustrates the general concept of the invention for a single raster scan line that is recorded in three tape tracks;
FIGURE 2 illustrates one replay technique for reconstructing the raster scan line of FIGURE 1 from a single track during the moviola mode;
FIGURE 3 illustrates a formating means with which tape formats can be recorded in a recording system of this invention;
FIGURE 4 illustrates a formating and replication means with which tape formats can be replayed in the recording system of the invention;
FIGURE 5 illustrates one embodiment of the invention wherein comparable color subcarrier cycles from each scan line in a raster are recorded in the same order on the tracks;
FIGURE 6 illustrates one arrangement of the format selector means in FIGURE 3 for the tape format of FIGURE 5;;
FIGURE 7 illustrates the vertical alignment of raster segments that is obtained when the raster scan lines of FIGURE 3 are replayed using the same technique as illustrated in FIGURE 2;
FIGURE 8 illustrates another embodiment of the invention wherein comparable color subcarrier cycles from adjacent scan lines in a raster are recorded on the tracks in a different order;
FIGURE 9 illustrates another arrangement of the format selector means in FIGURE 3 for the tape format of FIGURE 8; and
FIGURE 10 illustrates the diagonal alignment of raster segments that is obtained when another replay technique is utilized to reconstruct the raster scan lines of FIGURE 8.
In sampled or digital color video record and replay systems where a set of multiple tracks is used to record each raster frame or field, the very high speed of the recorded medium during the live search or moviola mode requires that a video signal be reconstructed from only a portion of the recorded information. For one such system the recorded video signal is digitized by sampling it at some predetermined multiple of its color subcarrier frequency. Conventional techiques may be utilized in this system to replay moviola information from only a single track while the recorded medium moves at the elevated speed, such as recording the moviola track with a head having an azimuth angle gap and replaying it with a corresponding type but oversized head.
Because the moviola picture is replayed from only a portion of the recorded information, only a picture of reduced quality is possible from such record and replay systems during the moviola mode. Furthermore, the replayed moviola raster contains increments from many recorded frames or fields due to the difference in the speed of the recorded medium during the record and moviola modes. However, the moviola picture quality is greatly enhanced in the record and replay system of this invention wherein only picture sample (pixel) groups relating to entire color subcarrier cycles are recorded on the individual tracks from which a video signal having proper color information is readily reconstructed by replaying a portion of those color subcarrier cycle pixel groups during the moviola mode.
As will be discussed hereinafter, conventional digital hardware is readily available from which to construct formating means for directing only pixel groups of entire color subcarrier cycles either to the tracks when recording, or from the tracks when replaying. Since the moviola mode is most commonly found in systems having both record and replay capabilities, both record and replay formating means will generally be discussed for a record and replay system of the invention.However, those skilled in the art will realize without any further explanation that the record and replay functions could be performed by separate and distinct subsystems with
a record formating means in accordance with th invention being found in one subsystem, a replay formating means in accordance with the invention
being found in the other suvstem, and a tape for
mat in accordance with the invention being recorded
in one subsystem and replayed in the othersubsystem.
One preferred tape format for use in the record and replay system of this invention is illustrated in
FIGURE 1 where pixel groups relating to sequential color subcarrier cycles of a single raster scan line are recorded on separate tracks in the multiple track set.
For purposes of discussion only, four pixels are taken during each color subcarrier cycle and three tracks are included in the multiple track set. Therefore, the first four pixels that are represented by dots, relate to the first color subcarrier cycle and are recorded on track 1; the second four pixels that are represented by triangles, relate to the second color subcarrier cycle and are recorded on track 2; the third four pixels that are represented by squares, relate to the third color subcarrier cycle and are recorded on track 3; with this same format reoccurring for each sequence of three color subcarrier cycles until the complete raster scan line has been recorded.Then during moviola replay, the video signal for this raster scan line is reconstructed from only a portion of the recorded color subcarrier cycle pixel groups, for example pixel groups from only one of the three tracks as will be discussed further hereinafter. However, the color information is preserved because that reconstruction is accomplished with entire color subcarrier cycles and therefore, the resulting picture quality is improved relative to that attainable with conventional recording systems.
Without ariy further explanation, it should be readily understood by those skilled in the art that the color subcarrier cycle pixel groups for all the raster scan lines in each frame of field would be recorded in the record and replay system of this invention.
Furthermore, the track order in which the sequential color subcarrier cycle pixel groups are recorded in
FIGURE 1 is not a limitation to the record and replay system of this invention and in fact, other track orders have been utilized to obtain better moviola replay results as will be discussed hereinafter.
When reconstructing a normal video signal for the raster scan line of FIGURE 1, all of the recorded color subcarrier cycie pixel groups are replayed in their recorded sequence from the tracks in the multiple track set. During the moviola mode however, the video signal for that raster scan line must be reconstructed from only a portion of the recorded color subcarrier cycle pixel groups with instantaneously coherent information being derived from each such
pixel group for display as a segment of the moviola
raster.Although the portion of the color subcarrier cycle pixel groups to be replayed during the moviola
mode could be dispersed over all the tracks of the
multiple track set within the concept of this invention, such pixel groups are recorded on a single
moviola track of the multiple track set in one conve cent tape format, such as track 1 in the tape format
of FIGURE 1. Then the instantaneously coherent
information for display as a segment of the moviola raster is derived by repeating each moviola color subcarriercycle pixel group a number of times equal to the number of tracks in the multiple track set. For example, the pixel groups relating to the first and fourth color subcarrier cycles in the raster scan line of FIGURE 1 are repeated three times in sequence when utilizing this replay technique, as illustrated by
FIGURE 2.Of course, any numberX of tracks may be utilized in the multiple track set and any number Y of pixels may be taken for each color subcarrier cycle in the record and replay system of this invention.
Therefore, this replay technique is generally applicable to the record and replay system of this invention by repeating X times each group of Y pixels that relates to a moviola color subcarrier cycle on the moviola track.
One preferred formating means for directing only pixel groups of entire subcarriercycles to the individual tracks when recording is shown in FIGURE 3.
Sequential color subcarrier cycle pixel groups representing each frame or field of the video signal are distributed to the multiple track set through individual buffer memories 10 for each track in the multiple track set A multiplexer 12 is cycled to apply a pixel clock as a write clock and the color subcarrier cycle pixels to each buffer memory 10 in a sequence established by a record format selector means 14 for controlling the multiplexer 12 to determine the entry order into the buffer memories 10 of the sequential pixel groups.The color subcarrier cycle pixel groups are stored in the buffer memories 10 during each cycle of the multiplexer 12 and simultaneously read out to the tracks at the completion of each multiplexer cycle when the pixel clock is applied as a read clock through a frequency divider 16 which divides by a number equal to the number of tracks in the multiple track set. The horizontal sync signal and the pixel clock are applied to drive the format selector means 14. Colorsubcarriercycle pixel groups may be processed through the record formating means in either serial or parallel digital word form, with individual parallel to serial converters 18 being utilized to pass the output of each buffer 10 when a parallel digital word form is utilized.
During normal reconstruction of a video signal from the multiple track set, all of the color subcarrier cycle pixel groups recorded on the tracks are processed through a replay formating means of identical but inverse structure to that of the record formating means. Therefore, such a replay formating means would direct the color subcarriercycle pixel groups from the tracks to a parallel arrangement of buffer memories through seriaL to parallel converters when necessary and from the buffer memories to display circuitry through a multiplexer under the overall control of a format selector means. During moviola reconstruction of a video signal however, the nature of the replay formating means depends on the distribution of the moviola color subcarrier cycle pixel groups in the multiple track set. Furthermore, instantaneously coherent information must be derived from each moviola color subcarrier cycle pixel group
replayed. Consequently, a record and replay system which derives such information with the previously
discussed color subcarrier cycle pixel group replica tion technique would include a replay formating and replication means for directing the moviola color subcarrier cycle pixel groups from the multiple track set and repeating each such color subcarrier cycle pixel group during replay to provide information.
When the video signal is reconstructed from a single track during the moviola mode in the manner discussed previously relative to FIGURE 2, such a replay formating and replication means could be structured as shown in FIGURE 4. A format converter 20 is disposed in this arrangement to present each moviola color subcarrier cycle pixel group on the moviola track in parallel format with each pixel being available from a separate output. A multiplexer 24 having the outputs from the format converter 20 applied thereto, is repeatedly cycled to pass each moviola color subcarrier cycle pixel group a number of times equal to the number of tracks in the multiple track set.Depending on the desired video display format, the output from the multiplexer 24 may be passed directly to the display circuitry as will be discussed further hereinafter. Atrack pixel clock is applied to the converter 20 to sequence the color subcarrier cycle pixel groups therethrough and it is also applied to control the multiplexer 24 through a series arrangement of a frequency multiplier 28 equal to the number of tracks in the multiple track set and a modulo counter 30 having a count equal to the number of pixels in each color subcarrier cycle pixel group.
A particular tape format for the record and replay system of the invention is illustrated in FIGURE 5 wherein corresponding color subcarrier cycle pixel groups from each scan line of a raster are recorded in the same order on the tracks of the multiple track set. For purposes of discussion only, the number of pixels in each group relating to each color subcarrier cycle and the number of tracks in the multiple track set, are the same as those previously selected for the single raster scan line recorded in FIGURE 1.Therefore, pixels 1-4 relating to the first color subcarrier cycle in each raster scan line are recorded on track 1; pixels 5-8 relating to the second color subcarrier cycle in each raster scan line are recorded on track 2; pixels 9-12 relating to the third color subcarrier cycle in each raster scan line are recorded on track 3; pixels 13-16 relating to the fourth color subcarrier cycle in each raster scan line are also recorded on track 1; pixels 17-20 relating to the fifth color subcarrier cycle in each raster scan line are also recorded on track 2; pixels 21-24 relating to the sixth color subcarrier cycle in each raster scan line are also recorded on track 3; and so on until the color subcarrier cycle pixel groups in all the raster scan lines are recorded.
Thus, corresponding color subcarrier cycles 1-4, 13-16, etc. of line 1, track 1 are in the same order for lines 2,3 etc. on track 1.
The recordformating meansorthe replay formating and replication means illustrated in FIGURE 3 and 4 respectively, may be utilized with the tape format of FIGURE 5. As shown in FIGURE 6, the format selector means 14 in the record formating means of FIGURE 3 would then include a modulo counter32 and a frequency divider 34. The modulo counter 32 would have a count equal to the number of tracks in the multiple track set and the output therefrom would be applied as the multiplexer control signal in FIGURE 3. Output from the divider34 would be applied to the incrementing input of the modulo counter 32 and it would divide the pixel clock rate by the number of pixels in each color subcarrier cycle pixel group while the horizontal sync signal would be applied to the reset input of the modulo counter 32.Consequently, output from the modulo counter 32 in FIGURE 6 advances the multiplexer 12 in FIGURE 3 to a new buffer memory position for each series of pixel clock pulses equal in duration to the duration of a color subcarrier cycle pixel group and returns the multiplexer 12 to the first buffer memory after each horizontal sync pulse. As discussed previously, the replay fo rmating and replication means of FIGURE 4 reconstructs the moviola video signal from color subcarrier cycle pixel groups on a single track. Those pixel groups are each separated into their individual pixels at the outputs of converter 20 and then repeated for display by the multiplexer 24 which the modulo counter 30 cycles a number of times equal to the number of tracks in the multiple track set for each pixel group.
Assuming that track 1 of the FIGURE 5 tape format is utilized for such moviola replay, a video signal for a full color picture will be reconstructed from color subcarrier cycle pixel groups 1-4 and 13-16 in each raster scan line as shown by the replay format of
FIGURE 7 where each pixel group is repeated three times in sequence to supply the instantaneously coherent information for display as a segment of the moviola raster. Since pixel groups relating to corresponding color subcarrier cycles in each raster scan line are recorded in the same tracks of the FIG
URE 5 tape format however, corresponding picture segments produced by repeating the moviola color subcarrier cycle pixel groups will be aligned in a very tical pattern.Although the resulting moviola picture will be of improved quality as discussed previously, the vertical pattern will limit its quality due to restricted horizonal resolution which causes color striping.
This vertical pattern can be avoided by using another tape format for the record and replay system of this invention wherein the corresponding color subcarriercycle pixel groups in adjacent raster scan lines are recorded on separate tracks in the multiple track set, as shown in FIGURE 8. For purposes of discussion only, the number of pixels in each group relating to each color subcarrier cycle and the number of tracks in the multiple track set, are the same as those previously selected for the single raster scan line recorded in FIGURE 1. Therefore, raster scan line 1 is recorded with its pixel groups 1-4, 13-16; etc., on track 1; its pixel groups 5-8, 17-20, etc., on track 2; its pixel groups 9-12,21-24, etc., on track 3; while raster scan line 2 is recorded with its pixel groups 5-8, 17-20, etc., on track 1; its pixel groups 1-4, 13-16, etc., on track 2; its pixel groups 9-12,21-24, etc., on track 3; and raster scan line 3 is recorded with its pixel groups 9-12, 21-24, etc., on track 1; its pixel groups 5-8, 17-20, etc., on track 2; its pixel groups 1-4, 13-16, etc., on track 3. Thus, corresponding color subcarrier cycle 1-4, for example, is
recorded on track 1 for line 1, track 2 for line 2, and
track 3 for line 3.
The tape format of FIGURE 8 may be recorded
through the record formating means of FIGURE 3
wherein the format selector means 14 would then
control the multiplexer 12 through a read only mem
ory 36, as shown in FIGURE 9. Outputs from two
modulo counters 38 and 40 are applied to advance
the read only memory 36 through its program which
is established to record corresponding color subcar
rier cycle pixel groups in adjacent raster scan lines
on separate tracks of the multiple track set. Each
modulo counter 38 and 40 has a count equal to the
number of tracks in the multiple track set and the
horizontal sync signal is applied to the incrementing
input of modulo counter 40 and to the reset input of modulo counter 38.The pixel clock is applied to the
incrementing input of the modulo counter 38 through a frequency divider 39 which divides by a number equal to the number of pixels in each color subcarrier cycle pixel group. Consequently, the multiplexer 12 in FIGURE 3 directs the bits for a complete color subcarrier cycle pixel group to an individual buffer memory 10 for each pulse the read only memory 36 receives from the modulo counter 38 and changes the multiplexer 12 for each pulse the read only memory 36 receives from the modulo counter 40. To record the tape format of FIGURE 8, the switching sequence of the multiplexer 12 is buffer memories 1,2,3, etc. for line 1; buffer memories 2, 1,3, etc. for line 2; buffer memories 3,2, 1, etc. for line 3; and a repeat of this sequencing until all the
raster scan lines are recorded.
The tape format of FIGURE 8 may be replayed through the replay formating and replication means of FIGURE 4with another multiplexer 42 being incorporated therein to offset the replay of each raster scan line relative to adjacent raster scan lines and thereby result in a replay format having a diagonal pattern of repeated pixel groups that do not correspond in adjacent raster scan lines, as shown in FIG
URE 10. The multiplexer 42 has a single output and a number of sequential inputs equal to the number of tracks in the multiple track set and those inputs are arranged from a first input to a last input. Successive inputs between the first and last inputs are interconnected through a delay 44 of a duration equal to the duration of a color subcarrier cycle and the output from the multiplexer 24 is applied to the first input.
Multiplexer 42 is controlled by the horizontal sync signal which is applied through a modulo counter 46 having a count equal to the number of tracks in the multiple track set. Consequently, when the multiplexer42 is located at its first input, the repeated pixel groups from multiplexer 24 are passed for display without delay. As the input position of multiplexer 42 is switched for each horizontal sync signal however, the display of those pixel groups is delayed by an additional color subcarrier cycle duration at each sequential input.
The replay formating and replication means of
FIGURE 4then functions to reproduce the tape format of FIGURE 8 in the replay format of FIGURE 10 where the raster scan line 1 is displayed with pixel group 1-4 being repeated three times to fill pixel
locations 1-12, pixel group 13-16 being repeated
three times to fill pixel locations 13-24, and soon;
raster scan line 2 is displayed with a dummy pixel
group filling pixel locations 1-4 during one delay
period, pixel group 5-8 being repeated three times to
fill pixel locations 5-16, pixel group 17-20 being
repeated 3 times to fill pixel locations 17-28, and so
on; raster scan line 3 is displayed with two dummy
pixel groupsfilling pixel locations 1-8 during two
delay periods, pixel group 9-12 being repeated three
times to fill pixel locations 9-20, pixel group 21-24
being repeated three times to fill pixel locations 21-32, and so on; raster scan line 4 is replayed in the same manner as raster scan line 1 and the replay format is replicated thereafter until the raster or video field is completed. The conventional edge conditions of a raster render the nature of the dummy pixel groups unimportant because many pixels at both the beginning and end of each raster scan line are not viewable. As an example, a typical raster scan line contains 910 pixels of which only 768 pixels are viewable. However, the dummy pixel groups for any raster scan line can be derived in many ways such as to use the pixel groups at the end of the immediately preceeding raster scan line orto merely leave the offset distance blank. A moviola picture of very acceptable quality results from the diagonal pattern of non-corresponding pixel groups in the replay format of FIGURE 10.
Those skilled in the art should understand without further explanation that other diagonal patterns of non-corresponding pixel groups are also possible as moviola replay formats which present higher quality pictures by comparison to the previously discussed replay format of FIGURE 7 wherein the vertical pattern of corresponding pixel groups is provided.
Claims (19)
1. A record wherein color video information sampled at a predetermined multiple of the color subcarrierfrequency is recorded with each video frame or field being disposed on a set of multiple tracks and with only a portion of the recorded information being intended for replay to reconstruct a color video signal during a moviola mode, and wherein only pixel groups relating to entire color subcarrier cycles are recorded on the tracks so that a video signal having proper color information can be readily reconstructed therefrom during the moviola mode.
2. A record as in claim 1 wherein sequential color subcarrier cycle pixel groups are recorded on separate tracks in the multiple track set with those pixel groups to be replayed during the moviola mode being recorded on a single moviola track so that the moviola calor subcarrier cycle pixel groups on said single track can be repeated in sequence when reconstructingthevideo signal duringthe moviola mode and thereby supply instantaneously coherent information.
3. A record as in claim 2 wherein corresponding color subcarrier cycle pixel groups from each raster scan line are recorded in the same order on the tracks of the multiple track set so that each repeated sequence of a color subcarrier cycle pixel group from a raster scan line vertically aligns with the repeated sequence of corresponding color subcar- rier cycle pixel groups from the other raster scan lines during the moviola mode.
4. A record as in claim 2 wherein corresponding color subcarrier cycle pixel groups in adjacent raster scan lines are recorded on separate tracks of the multiple track set so that dummy pixel groups may be included during the moviola mode to offsetthe replay of each raster scan line relative to adjacent raster scan lines and thereby derive a replay format in which repeated sequences of non-corresponding color subcarrier cycle pixel groups in adjacent raster scan lines are aligned in a diagonal pattern.
5. A record system wherein color video information sampled at a predetermined multiple of the color subcarrier frequency is recorded with each video field or frame disposed on a set of multiple tracks and with only a portion of the recorded information being intended for replayto reconstructthe color video signal during a moviola mode, said system comprising:
formating means for directing only pixel groups of entire subcarrier cycles to the individual tracks when recording.
6. A record system as in claim 5 wherein said record formating means includes:
a buffer memory for each track in the multiple track set;
a multiplexer through which sequential color subcarrier cycle pixel groups are separately passed to said buffer memories, said pixel groups being stored in said buffer memories during each cycle of said multiplexer and simultaneously read out to the tracks at the completion of each multiplexer cycle; and
record format selector means for controlling said multiplexer to determine the entry order into said buffer memories of the sequential pixel groups.
7. A record system as in claim 6 wherein said record format selector means controls said multiplexerthrough a modulo counter to record corresponding color subcarrier cycle pixel groups from each raster scan line in the same order on the tracks of the multiple track set, said modulo counter having a count equal to the number of tracks and having the horizontal sync signal applied to its reset input while the pixel clock is applied to its incrementing input through a divider that divides by a number equal to the number of pixels in each color subcarrier cycle pixel group.
8. A record system as in claim 6 wherein said record format selector means controls said multiplexerthrough a read only memory programmed with the multiplexing sequence necessary to record corresponding color subcarrier cycle pixel groups in adjacent raster scan lines on separate tracks of the multiple track set, said read only memory having the horizontal sync signal applied thereto through a first modulo counter with a count equal to the number of tracks in the multiple track set and having the output applied thereto from a second modulo counter with a count equal to the number of tracks in the multiple track set, said second modulo counter having the horizontal sync signal applied to its reset input and the pixel clock applied to its incrementing input through a divider that divides by a number equal to the number of pixels in each color subcarrier cycle pixel group.
9. A replay system for color video information sampled at a predetermined multiple of the color subcarrierfrequency and recorded with each video field or frame disposed on a set of multiple tracks and with only a portion of the recorded information being intended for replay to reconstruct the color video signal during a moviola mode, said system comprising:
replay formating and replication means for directing the moviola color subcarrier cycle pixel groups from the multiple track set and repeating each moviola color subcarrier cycle pixel group a number of times to provide instantaneous coherent information during the moviola mode.
10. A replay system as in claim 9 for sequential color subcarrier cycle pixel groups recorded on separate tracks in the multiple track set with corresponding color subcarrier cycle pixel groups from each raster scan line recorded in the same order on the tracks of the multiple track set; wherein only those pixel groups on a single track are processed through said moviola replay formating and replication means which includes:
a format converter to present the moviola color subcarrier cycle pixel groups on said single track in parallel format with each pixel being available from a separate output; and
a multiplexer to which the outputs from said format converter are applied, said multiplexer being cycled to repeatedly pass each moviola color subcarrier cycle pixel group a number of times equal to the number of tracks in the multiple track set so that upon being displayed each repeated sequence of a color subcarrier cycle pixel group from a raster scan line is vertically aligned with the corresponding repeated sequence of color subcarrier cycle pixel groups from the other raster scan lines.
11. A replay system as in claim 9 for sequential color subcarrier cycle pixel groups recorded on separate tracks in the multiple track set with corresponding color subcarrier cycle pixel groups in adjacent raster scan lines recorded on separate tracks of the multiple track set; wherein only those pixel groups on a single track are processed through said moviola replay formating and replication means which includes:
a format converter to present the moviola color subcarrier cycle pixel groups on said single track in parallel format with each pixel being available from a separate output;
a first multiplexer to which the outputs from said format converter are applied, said first multiplexer being cycled to repeatedly pass each moviola subcarrier cycle pixel group a number of times equal to the number of tracks in the multiple track set; and
a second multiplexer having a single output and a number of sequential inputs equal to the number of tracks in the multiple track set, said sequential inputs being arranged from a first input to a last input with each successive inputtherebetween interconnected through a delay of a duration equal to the duration of a color subcarrier cycle and with said first input hav
ing the output from said first multiplexer applied
thereto, said second multiplexer being cycled
through successive inputs by the horizontal sync
signal so that upon being displayed each raster scan
line is offset relative to adjacent raster scan lines
with each repeated sequence of a color subcarrier cycle pixel group in a raster scan line being diagonally aligned with repeated sequences of color subcarrier cycle pixel groups in adjacent raster scan lines that do not correspond therewith.
12. A record and replay system wherein color video sampled at a predetermined multiple of the colorsubcarrierfrequency is recorded with each video field or frame disposed on a set of multiple tracks and with only a portion of the recorded information being intended for replay to reconstruct the color video signal during a moviola mode, said system formating means for directing only pixel groups of entire subcarrier cycles to the individual tracks when recording; and
replay formating and replication means for directing the moviola color subcarrier cycle pixel groups from the multiple track set and repeating each moviola color subcarrier cycle pixel group a number of times to provide instantaneous coherent information during the moviola mode.
13. A record and replay system as in claim 12 wherein said record formating means includes:
a buffer memory for each track in the multiple track set;
a multiplexer through which sequential color subcarrier cycle pixel groups are separately passed to said buffer memories, said pixel groups being stored
in said buffer memories during each cycle of said
multiplexer and simultaneously read out to the tracks at the completion of each multiplexer cycle; and
record format selector means for controlling said multiplexer to determine the entry order into said buffer memories of the sequential pixel groups.
14. A record system as in claim 13 wherein said record format selector means controls said multiplexerthrough a modulo counter to record corresponding color subcarrier cycle pixel groups from each raster scan line in the same order on the tracks of the multiple track set, said modulo counter having a count equal to the number of tracks and having the horizontal sync signal applied to its incrementing input through a divider that divides by a number equal to the number of pixels in each color subcarrier cycle pixel group.
15. A record system as in claim 13 wherein said record format selector means controls said multiplexerthrough a read only memory programmed with the multiplexing sequence necessary to record corresponding color subcarrier cycle pixel groups in adjacent raster scan lines on separate tracks of the multiple track set, said read only memory having the
horizontal sync signal applied thereto through a first
modulo counter with a count equal to the number of tracks in the multiple track set and having the output
applied thereto from a second modulo counter with
a count equal to the number of tracks in the multiple track set, said second modulo counter having the
horizontal sync signal applied to its reset input and the pixel clock applied to its incrementing input through a divider that divides by a number equal to the number of pixels in each color subcarrier cycle pixel group.
16. A record and replay system as in claim 12 wherein sequential color subcarrier cycle pixel groups are recorded on separate tracks in the multi ple track set with corresponding color subca rrier cycle pixel groups from each raster scan line being recorded in the same orderon the tracks of the multiple track set; and wherein only those pixel groups on a single track are processed through said moviola replay formating and replication means which includes: aformatconverterto present the moviola color subcarriercycle pixel groups on said single track in parallel format with each pixel being available from a separate output; and
a multiplexer to which the outputs from said format converter are applied, said multiplexer being cycled to repeatedly pass each moviola color subcarrier cycle pixel group a number of times equal to the number of tracks in the multiple track set so that upon being displayed each repeated sequence of a color subcarrier cycle pixel group from a raster scan line is vertically aligned with the corresponding repeated sequence of color subcarrier cycle pixel groups from the other raster scan lines.
17. A system as in claim 12 wherein sequential color subcarrier cycle pixel groups are recorded on separate tracks in the multiple track set with corresponding color subcarrier cycle pixel groups in adjacent raster scan lines being recorded on separate tracks of the multiple track set; and wherein those pixel groups on a single track are processed through said moviola replayformating and replication means which includes::
a formatconverterto present the moviola color subcarriercycle pixel groups on said single track in parallel format with each pixel being available from a separate output;
a first multiplexer to which the outputs from said format converter are applied, said first multiplexer being cycled to repeatedly pass each moviola subcarrier cycle pixel group a number of times equal to the number of tracks in the multiple track set; and
a second multiplexer having a single output and a number of seq uential inputs equal to the number of tracks in the multiple track set, said sequential inputs being arranged from a first input to a last input with each successive input therebetween interconnected through a delay of a duration equal to the duration of a color subcarrier cycle and with said first input having the output from said first multiplexer applied thereto, said second multiplexer being cycled through successive inputs by the horizontal sync signal so that upon being displayed each raster scan line is offset relative to adjacent raster scan lines with each repeated sequence of a color subcarrier cycle pixel group in a raster scan line being diagonally aligned with repeated sequences of color subcarrier cycle pixel groups in adjacent raster scan lines that do not correspond therewith.
18. A record having sampled color video information recorded thereon in a format substantially as hereinbefore described with reference to Fig. 1, Fig.
5 or Fig. 8 of the accompanying drawings.
19. A record and/or record system substantially as hereinbefore described with reference to any of Figs. 1, 3, 5 and 8 and/or, respectively, any of Figs. 2, 4,6 and 10, of the accompanying drawings.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8007163 | 1980-03-03 | ||
| GB8007669 | 1980-03-06 | ||
| US06/163,150 US4355324A (en) | 1980-03-03 | 1980-06-26 | Sampled or digitized color in a high speed search record and replay system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2070887A true GB2070887A (en) | 1981-09-09 |
| GB2070887B GB2070887B (en) | 1984-08-08 |
Family
ID=27260882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8106329A Expired GB2070887B (en) | 1980-03-03 | 1981-02-27 | Sampled or digitized colour moviola in a record and replay system |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3107870A1 (en) |
| FR (1) | FR2477353B1 (en) |
| GB (1) | GB2070887B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2494946A1 (en) * | 1980-11-26 | 1982-05-28 | Rca Corp | HELICOIDAL SCANNING STRIP RECORDING FORMAT AND RECORDING OR RESTITUTION DEVICE FOR USE THEREOF |
| FR2501446A1 (en) * | 1981-03-09 | 1982-09-10 | Rca Corp | DIGITAL VIDEO RECORDING FORMAT AND DEVICE FOR RECORDING DIGITAL TELEVISION SIGNALS |
| GB2217947A (en) * | 1988-04-23 | 1989-11-01 | Sony Corp | Composite type digital video signal recording |
| GB2231463A (en) * | 1989-03-22 | 1990-11-14 | Toshiba Kk | Video tape recorder |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3975764A (en) * | 1973-10-12 | 1976-08-17 | Matsushita Electric Industrial Co., Ltd. | Television signal recording and reproducing system |
| DE2708672A1 (en) * | 1977-02-28 | 1978-08-31 | Siemens Ag | Analog video tape recording and playback - splits video signal into components of equal bandwidth and records them in parallel on longitudinal tracks |
| CA1160739A (en) * | 1979-10-12 | 1984-01-17 | Yoshitaka Hashimoto | Method for recording a color video signal |
-
1981
- 1981-02-27 GB GB8106329A patent/GB2070887B/en not_active Expired
- 1981-03-02 DE DE19813107870 patent/DE3107870A1/en active Granted
- 1981-03-03 FR FR8104204A patent/FR2477353B1/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2494946A1 (en) * | 1980-11-26 | 1982-05-28 | Rca Corp | HELICOIDAL SCANNING STRIP RECORDING FORMAT AND RECORDING OR RESTITUTION DEVICE FOR USE THEREOF |
| FR2501446A1 (en) * | 1981-03-09 | 1982-09-10 | Rca Corp | DIGITAL VIDEO RECORDING FORMAT AND DEVICE FOR RECORDING DIGITAL TELEVISION SIGNALS |
| GB2217947A (en) * | 1988-04-23 | 1989-11-01 | Sony Corp | Composite type digital video signal recording |
| GB2231463A (en) * | 1989-03-22 | 1990-11-14 | Toshiba Kk | Video tape recorder |
| US5161031A (en) * | 1989-03-22 | 1992-11-03 | Kabushiki Kaisha Toshiba | Apparatus for processing data for a video tape recorder |
| GB2231463B (en) * | 1989-03-22 | 1994-01-19 | Toshiba Kk | Video tape recorder |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3107870C2 (en) | 1987-01-22 |
| DE3107870A1 (en) | 1982-01-28 |
| GB2070887B (en) | 1984-08-08 |
| FR2477353A1 (en) | 1981-09-04 |
| FR2477353B1 (en) | 1985-10-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990227 |