KR950013831B1 - Segmented tape format video tape system - Google Patents

Abstract

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Description

Partitioned Tape Format Video Tape Systems

1 illustrates an embodiment of a multiple recording format in accordance with the principles of the present invention.

FIG. 2 shows a sequence of Y, I and Q samples to be recorded in the tracks of each longitudinal segment (division) of the magnetic tape having the multiple recording format shown in FIG.

3 is a schematic illustration of a scanner apparatus used to scan a track in accordance with the multiple recording format shown in FIG.

4 schematically illustrates an arrangement for processing Y, I and Q component pixels with respective transducers of FIG.

5 illustrates a multiple recording format according to one aspect of the present invention suitable for use as a portable tape device.

6 illustrates an arrangement of transducers on a handheld scanner suitable for use with multiple recording formats in accordance with aspects of the present invention.

FIG. 7A shows a tape wrap (tape winding) and FIG. 7B shows the position of a transducer on a scanner to scan a track according to the multiple recording format shown in FIG. 7C.

FIG. 8A shows a tape wrap and FIG. 8B shows the position of a transducer on a scanner to scan a track according to the multiple recording format shown in FIG. 8C.

9 and 10 respectively show a recording and reproduction pixel reformatting system suitable for use with the recording formats of FIGS. 1, 5, and 7c.

11 illustrates another embodiment of a multiple recording format in accordance with aspects of the present invention.

FIG. 12 is a block diagram of a recording / playback (playback) system capable of recording and playing back a television signal according to the format shown in FIG.

13A-13I are timing diagrams useful for explaining the operation of the FIG. 12 system.

* Explanation of symbols for main parts of the drawings

10, 12, 14: switch 16, 18, 20: modular counter

30: preamble and sync insertion unit 40, 74: timing unit

54: Reproduction Amplifier 58: Preamble and Sync Extractor

120: recording / playback system 129: scanner device

310: converter head 312: motor

314: drive

Many different recording formats are known for use in a video tape system consisting of a recording and playback section, but these systems are designed to use only one format. Therefore, a tape recorded by one system cannot be reproduced in another system, and thus is not compatible between systems having different recording formats. If high performance is desired, a recording format that requires extensive tape consumption and complex signal processing circuitry must be used, which is very cumbersome for portable recorders. However, if the recording format is simplified to reduce the size of the portable recording device by reducing the tape consumption and the number of circuits, the performance is reduced.

It has been proposed to use a high-speed data system to obtain the high quality performance required by studio equipment, and to utilize a layer of digital television standards that enables the miniaturization of portable devices using low-speed data systems. The layers of the Y, I, and Q components (components) of a television signal provide a low-speed system by sampling components at a 2: 1: 1 ratio by sampling the components at a 4: 2: 1 ratio. do. For example, the currently contemplated standard uses sampling frequencies of 13.5 MHz, corresponding to four levels in the hierarchy, so that levels 2 and 1 use frequencies of 6.75 and 3.375 MHz, respectively. Although these layers are of great use in studios and portable recording devices, the individual recording formats for high-speed and low-speed data systems are easily interconnected in that tapes recorded by one system cannot be played directly on another system. Not replaceable In order to convert the recording format of one system to the recording format of another system, recording information sampled at one hierarchical level must be reproduced and transcoded at another hierarchical level and rewritten or transmitted around the studio.

Multiple recording formats of a video tape recording and reproducing system are provided, wherein the tape is laterally divided into a plurality of vertical segments, the predetermined segments being different because the entire raster information is assigned to tracks recorded at partial resolution. Data rates or formats are available in other forms of systems such as studios and portable recording devices.

Hereinafter, the present invention with reference to the accompanying drawings will be described in more detail.

In digital video tape recording and reproducing systems, the recorded information is typically associated with each picture (eg, a television field or frame) by a grid of samples to be displayed on the raster. Multiple recording formats of digital video tape recording and playback systems are disclosed to provide compactness as a portable facility while making available to the quality capabilities of a studio facility. In this multiple recording format, the tape is laterally divided into a plurality of segments, each segment being assigned full raster information recorded at a partial pixel resolution equal to the quotient 1 divided by the number of the plurality of vertical tape segments. Video is first digitized by sampling pixels (pixels or samples) at a predetermined frequency, which pixels are associated with composite or component video information. Each pixel is provided via a converter to a characteristic track of one of the longitudinal segments, which track may be arranged in each segment along the tape travel direction or in each segment at any angle across the tape travel direction. .

A preferred embodiment of a multiple recording format according to the present invention is shown in FIG. 1, in which the Y, I and Q components of video information are recorded. By way of example a longitudinal track comprising audio and cues in FIG. 1 is scanned on the tape 5 by a fixed transducer head 310 in FIG. The Y, I and Q components are sampled at the usual ratio of 4: 2: 2 respectively during one raster scan line, as shown in FIG. The tape 5 is also divided into two longitudinal segments 6 and 7 and the entire raster information is recorded at half resolution on each longitudinal tape segment. Therefore, two Y-tracks, one I-track and one Q-track are disposed in the 4-track portion of each longitudinal segment, each of which is scanned across the tape movement direction in a helical pattern. As shown in FIG. 3, each track in the four-track portion is separated on the rotary scanner 300 driven by the motor 312 and the drive 314 Y ₁ , Y ₂ , Y ₃ , Y ₄ ,. It is injected simultaneously by I ₁ , I ₂ , Q ₁ and Q ₂ . The tape is moved across the headwheel 300 surface by a drive including capstan 316 in an arrangement familiar to those skilled in the art. In FIG. 3, since the transducer is located under the tape 5, the transducer should be indicated by a dotted line, but because of its small size, it is indicated by a straight line for clarity. 3 shows a tape wrap at approximately 270 ° angles. However, any lap angle is available and actually 360 ° omega wrap (Ω winding) is also possible. Furthermore, each four-track portion may contain information about one field or frame in a format familiar to those skilled in the art. In all raster scan lines of video information, track Y ₁ includes Y pixels 1, 5, 9, 13, and the like; Track Y ₂ includes Y pixels 2, 6, 10, 14, and the like; Track Y ₃ includes Y pixels 3, 7, 11, 15, and the like; Track Y ₄ includes Y pixels 4, 8, 12, 16, and the like; Track I ₁ includes I pixels 1, 3, 5, 7, and the like; Track I ₂ includes I pixels 2, 4, 6, 8, and the like; Track Q ₁ includes Q pixels 1, 3, 5, 7, and the like; Track Q ₂ includes Q pixels 3, 4, 6, 8, and the like. In this recording format, video information can be recorded at full resolution on two vertical segments of tape with a studio recording device that is not a primary concern of compaction and portability or a portable recording unit of primary concern of compaction and portability. It can be recorded at half resolution on only one longitudinal segment of the tape having.

In order to record video information at half resolution in a separate vertical tape segment, the Y, I and Q components can be constructed in many different ways than those described above in connection with the first degree. For example, video information relating only to odd raster scan lines may be recorded in one newly tape segment, while video information relating only to even raster scan lines may be recorded in another vertical tape segment. In addition, video information relating only to the odd field may be recorded in one vertical tape segment, while video information relating only to the even field may be recorded in another vertical tape segment. In addition, the concept of the invention disclosed in U.S. Patent No. 4,393,114 entitled July 12, 1983, entitled "Interleaved Recording Format for Digital Video," refers to a separate longitudinal tape segment of FIG. By recording each interleaved checkerboard pixel pattern shown in FIG. 1 it can be moved according to the inventive concept.

As described above with respect to FIG. 3, those skilled in the art will appreciate that the transducer means may be adapted to the respective Y ₁ , Y ₂ , Y ₃ , Y ₄ , I ₁ , I ₂ , Q ₁ and Q _{2 in the} inclined pattern of FIG. 1. It will be readily appreciated that the track is provided on the rotary scanner 300. 4 shows an arrangement for providing Y, I and Q component pixels to each of the transducers on the scanner 300. Since the particular recording format selected may have any number of tracks assigned to each of the Y, I and Q components, this arrangement is intended for the general situation where the number of other tracks and the 4: 2: 2 recording format of FIG. Will be described. The pixels of each signal component are supplied to switches 10, 12 and 14, respectively, associated with the Q, I and Y components. Although the switches 10, 12 and 14 are shown as mechanical switches, it is readily understood that the same electronic switch will be used in practice. Each switch 10, 12 and 14 has a number of output positions equal to the number of format tracks assigned to that signal component. Each output from the switches 10, 12 and 14 is supplied in a known form to a track on the recording medium via one of the converters shown in FIG. The switching positions of the switches 10, 12 and 14 are controlled by the output coefficients of the modulo counters 16, 18 and 20. Each of the modulo counters 16, 18, and 20 has a plurality of count outputs equal to the number of format tracks assigned to the signal components of the switches 10, 12, or 14, and also the nature of the particular format selected. Has a programmable start count output. Since the Q and I components are assigned to only one track in the 4-track portion of each longitudinal cape segment in the recording format of FIG. 1, the modulo counters 16 and 18 can be flip-flops in this hardware configuration. Each modulo counter 16, 18 and 20 is driven with a pixel rate clock of the signal component with which the switch 10, 12 or 14 is associated. For example, a clock 22 indicating a frequency (13.5 MHz) corresponding to the "4" layer level is directly applied to the drive module counter 20. The clock 22 is applied through the two-division unit 24 to derive the " 2 " level frequency needed by the counters 16 and 18 to the drive module. The modulo counter 20 is of programmable start count type. The horizontal sync signal is applied to the start count input of each modulo counter 16, 18 and 20 so that the recording of each raster scan line starts with the first Y pixels. Each switch 10, 12, or 14 is set to a different track position for the output counts of its respective modulo counters 16, 18, and 20 so that the Y, I, and Q component pixels can be designated tracks in different vertical tape segments. Is provided. It will be readily apparent to those skilled in the art that the switching arrangement for reproducing a specific recording format embodiment is the inverse relationship of the specific switching arrangement selected for recording the format, and thus, for the sake of brevity, the description of such reproduction switching will be omitted. Thus, the playback switching configuration for the write switching configuration of FIG. 4 has a separate switch for receiving each of the Y, I and Q component pixels from the tape track through the converter, and each switch when reconstructing the proper playback signal from the tape track. The module to control contains a counter. Of course, the modulo counter is driven by the clocking arrangement and the horizontal synchronizing signal in a manner similar to that shown in FIG.

Of course, the playback unit of the system should be capable of playing back video information as a display signal in full resolution or half resolution recording format on the tape of FIG. Those skilled in the art will appreciate that the entirety of the resolution format will be no problem since the playback unit performs the reverse function with the playback recording unit in reverse order. Thus, in the playback unit the converter picks up all the video information from the tracks in the two longitudinal segments of the tape and processes the information in a known conventional manner to derive the display signal. In the present invention, although the playback unit is also not of a quality suitable for the studio, 1/2 resolution from one longitudinal segment of the tape in such a way that a picture obtained from a display signal, such as an ENG (Electronic News Collection) application, is acceptable. The format can also be played back. However, in the concept of digital video layers, lower quality level signals may be transcoded to higher quality levels using known error compensation or concealment techniques such as interpolation disclosed in US Pat. No. 4,041,453. Thus, a hierarchy transcoder can be coupled to the playback unit to process half resolution video information (separately or as part of a concealment system) when inducing a suitable quality display signal that is optimal for the studio. . Another design method for this class of transcoder is the October 1981 SMPTE periodical, page 956-959, entitled "Single System of Binary Layer Digital Filters" by John Piet. In Rossi's paper.

FIG. 1 A portable unit is used to record video information at half resolution on only one longitudinal segment located on one side of the tape. The other vertical segments located on the other side of the remaining tape margin are left blank. In order to make full use of the tape's deck and thus to improve the functional form of the portable recording unit, the margin (blank) portion of the tape's tape is one half of the other preferred embodiment of the present invention shown in FIG. Video information is recorded at the resolution. Each longitudinal segment of the tape is independently recorded or played back in this embodiment while the tape travels through its entire length and after the longitudinal segments disposed toward one side of the tape are recorded or played back, the tape is " flip ( "flip" and supplied in the reverse direction to record or reproduce video information in the vertical segment located toward the other side of the tape. Therefore, the tracks in each vertical segment of the FIG. 5 recording format traverse in different directions. However, the tape deck can be rewound between recording or playback of video information in its respective vertical segment, as in another embodiment of the invention, so that the tracks in each vertical segment traverse the tape in the same direction. In addition, the component video information is shown in the recording format of FIG. 5 for the purpose of illustration only, and the composite video information of 1/2 resolution can be easily recorded or reproduced in virtually the same format at 1/2 resolution.

Since the recording format embodiment of the present invention relates only to partial raster resolution, as shown in FIG. 5, the number of converters on the scanner can be reduced in the recording and reproducing system apparatus operating only with these recording formats. One example of such equipment would be a portable recording unit or an electronic news collection (ENG) television recorder and a scanner for recording or playing back the format of FIG. 5 in such equipment is shown in FIG. Of course, the switching arrangement as described above in connection with the fourth degree is used to supply Y, I and Q component pixels to respective converters on the scanner during the recording or reproduction mode.

Although only two vertical tape segments are included in the multiple recording formats of FIGS. 1 and 5, more segments may be included in other formats within the scope of the present invention. The converter may also be configured in different ways on the scanner to drive various formats and the video information may be configured in different ways for each of these formats. Examples of other formats within the scope of the present invention are shown in FIGS. 7 and 8, where only possible tape wraps around the scanner and converter configurations on the scanner are shown for each format. For the format of FIG. 7c, the tandem transducer pairs (A, B) and (C, D) are placed in a single position around the scanner as shown in FIG. 7a and roughly as shown in FIG. 7b. It is separated across the axis of the scanner by a distance equal to half its length. Each tendam pair transducer scans a separation track in a longitudinal tape segment on a tape wrapped around the scanner at approximately 346 ° angles. For each resolution of the scanner, each pair of Tendam transducers selects tracks in separate longitudinal track segments with tracks (A and B) arranged in one longitudinal tape segment and tracks (C and D) arranged in another longitudinal tape segment. Inject. In the case of the format of FIG. 8C, as shown in FIG. 8A, the Tendam transducer pairs (A, B) and (C, D) are arranged in the first position around the scanner, while the Tendam transducer pairs (E, F) And (G, H) are disposed at a second position on the periphery of the scanner that is 180 degrees from the first position. As shown in FIG. 8B, the tendam transducer pairs A and B separate the ten dam transducer pairs C and D across the syringe length at approximately the same distance as about half of the shaft length, while the ten dams. The transducer pairs E, F separate the tendam transducer pairs G, H across the syringe axis length at a distance equal to approximately half of that axis length. Tendam transducer pairs (E, F) and (G, H) should be shown in dashed lines, but are shown in straight lines for clarity because of their small size. Each tendam transducer scans each track in two longitudinal segments on a tape wrapped around the scanner at 180 degrees. Each scanner scans each track in two longitudinal segments on a tape wrapped around the scanner at the first 180 degrees. While each scanner is rotated for the first 180 degrees, as shown in FIG. 8C, the Tendam transducer AB scans the first lower longitudinal segment tracks A and B, and the Tendam transducer CD tracks in the upper longitudinal tape segment. (C and D) are injected. While each scanner is finally rotated 180 °, the Tendam transducer EF first scans the tracks E and F in the lower longitudinal tape segment and the Tendam transducer GH tracks in the lower longitudinal tape segment (GA value H). Inject

The recording format of the present invention can be used in other conventional recording and reproducing systems, such as the recording system shown in FIG. 9 and the reproduction system shown in FIG. These two systems can have the desired number of track channels, but two track channels 1 and 2 have been selected for ease of explanation.

In the recording system of FIG. 9, the digitized Y, I and Q components of the video signal are respectively applied to the input of the pixel formatter 20 constructed according to FIG. 10 of US Pat. No. 4,393,414.

The Y clock of the pixel formatter 20 is 1.35 MHz while the I and Q clocks are 6.75 MHz. For purposes of explanation only 8-bit parallel format is used at each input of the formatter 20. The hardware arrangement shown in FIG. 4 operates as a pixel formatter with individual inputs for each of the Y, I and Q components in the recording system having four track channels directed to each longitudinal tape segment. However, the recording system of FIG. 9 can have only two inputs having a Y component applied at one input and two I and Q components applied at another input. In such a system, multiplexing circuitry in the pixel formatter provides the necessary interface standard. Pixel formatter 20 distributes a preselected combination of Y, I, and Q pixels to tape scan formatter 22 in each track channel. 13.5 MHz clock at input, horizontal and vertical sync, resin fieldpart signal V / 5 or V / 6 (which is intended to accommodate 5 turns / field in 525-line TV system and 6 turns / field in 625-line TV system, respectively) A control signal comprising a video data rate (11.8 MHz) clock at the output is applied to each tape scan formatter 22 that operates to switch from video rate to tape data rate, while " Information is synchronized by leaving blank (blank). For convenience of explanation, it should be noted that all these control signals are shown to be applied to the track channel 2 only, and this control signal is also applied to the track channel 1. As is known in the art, the video data rate (11.8 MHz) clock is determined according to the information rate of the active picture plus the rate of the digital sync plus the parity rate, and horizontal and vertical sync redundancy is eliminated. . The pixel combination passes from the scan formatter 22 in each track channel to an error detection and correction (EDAC) / parity insertion unit 24 that inserts computer redundancy by correction or detection of errors in the recording or playback process. Thus, some DVTR overhead is considered. The data rate clock is applied to control the passing of pixel combinations through the EDAC / parity insertion unit 24. In each track channel, pixel assembly is supplied from a flutter buffer, which accepts or corrects any time-base error (TBE) from the EDAC / parity insertion unit 24 in the machine of the recording system in relation to the video information being recorded. 26). As is known to those skilled in the art, the flutter buffer 26 includes a memory of sufficient capacity to accommodate a TBE. This memory is synchronous with the input video, has a data rate (11.8 MHz) clock that controls its input, and is synchronized with tape transmissions, and has a mechanical rate (11.8 MHz) clock that controls its output. The parallel format of the pixel combination in each track channel is serially through converter 28 with a mechanical rate clock applied directly to control its input and through an eighth unit 29 as a write rate clock to control its output. The format is changed. From the converter 28, the pixel combination passes through a preamble and a sync insertion unit 30, which serve to set the digital sync which occupies the beginning of the scan information and a few blocks per line. The write rate clock is applied to control the passage of the pixel combination through the preamble and sync insertion unit 30. The combination of pixels in each channel passes from the preamble and sync insertion unit 30 to the track channel coder 32 which constitutes the raw digital information according to the tape recording code to be used. The write rate clock passes through the track channel coder 32 to the changed switching unit 36 where the position signal is applied from the rotating headwheel in the tape feeder 38. Some transducers (such as four single transducers in the same position as the four tendam transducer pairs in FIG. 8B that scan only the tracks A, E, C, and G in FIG. Wrap) on the headwheel to feed the tape moving through the angle. The servo reference signal is applied to the conveyor 38 by a timing unit 40 to which the video synchronization and headwheel position signals are applied and to which all clock, synchronization signals and vertical field part signals are supplied.

As described above, the playback system performs the reverse operation of the recording system in reverse order. Therefore, in the playback system of FIG. 10, the information recorded on the tape moving relative to the headwheel in the tape conveyer 50 is transferred by several transducers (four as in FIG. 9 recording system) arranged on the headwheel. Picked up in serial format. The converter switching unit 52 distributes this information to the regeneration amplifier 54 in the track channels 1 and 2. The position signal is applied from the headwheel to the switching unit 52. Each amplifier 54 passes the information of each track channel to a track channel decoder 56 that derives the original digital information and operates to generate a mechanical rate clock concurrently with the conveyor 50. The original digital information (also still in serial format) in each track channel is passed to the preamble and sync extractor 58 where the start of scan information and digital sync information is eliminated. The mechanical rate clock is applied to control the passage of information through the preamble and sync extractor 58. In each channel, converter 60 receives the serial bit string and converts the serial format into a combination of pixels in an 8-bit parallel format. The mechanical rate clock is applied to the converter 60 as a reproduction rate (11.8 MHz) clock through the eight division unit 61 or directly. A combination of pixels in each channel is applied to the converter 60. The pixel combinations in each channel are passed from converter 60 to a flutter buffer 62 which adjusts or corrects any time-base error (TBE) to the playback system mechanics associated with the video information being played. This is accomplished by clocking the pixel combination at a refresh rate (11.8 MHz) clock in the buffer 62. In addition, differential signals from the time comparator 64 are respectively applied to the flutter buffer 62. In addition to adjusting the TBE, the flutter buffer 62 responds to the differential signal as a programmable delay that adjusts for any timing or mechanical error that may occur between track channels. The sync signal from each preamble and sync extractor 58 is applied to time comparator 64 where it is used to extract the differential signal. The combination of pixels in each channel passes from the flutter buffer 62 to the EDAC 66, which serves to fix the correctable error and flag the detectable error. The data rate clock is applied to control the passing of pixel combinations through the EDAC unit 66. The pixel combination in each track channel passes from the EDAC 66 to the tape scan deformatter 68 with a detectable error flag that is passed in the separation path, such as using the added bits. Deformatter 68 works to eliminate overhead "blanks" and converts from tape rate to video rate. A control signal comprising a data rate clock at the input, horizontal and vertical sync, vertical field partial signals V / 5 or V / 6 and a 13.5 MHz clock at the output are applied to each deformatter 68. Pixel combinations from each in-channel deformatter 68 pass through a pixel deformatter 70 with a detectable error flag passing through the separation path. Deformatter 70 is controlled by a 13.5 MHz clock and collects pixel combinations from both track channels and supplies Y, I and Q pixels to the individual video inputs via error concealment means 72. The same can be used for component pixel recording with error concealment means such as those described in US Pat. No. 4,376,455 for composite pixel recording and similar techniques as described in this patent. Between the deformatter 70 and each concealment means 72, a detectable error flag also passes through the isolation path so that the 13.5 MHz clock controls the passage of pixels through each concealment means 72. The server reference signal is applied from the timing section 74 to the tape feeder 50, except for the mechanical rate clock and the reproduction cost (11.8 MHz) clock extracted from the track channel decoder 56, the clock, sync signal and field portion. The signal is derived from a timing portion 74 to which video synchronization and headwheel position signals are applied. The pixel deformatter 70 includes the same hardware as that of the pixel formatter 20 in the recording system of FIG. However, the switch in 70 is connected to the multiple input of the deformatter 68 and to the signal output supplied to the video output.

11 shows a multi-segment recording format for recording progressively scanned television signals on a magnetic tape. The format consists of the non-interlaced video lines 1,2,3,... Of each frame of the sequentially scanned television signal. n… Is separated into A and B interlaced (interlaced) fields before being recorded in other vertical segments. By inverting the recording sequence of adjacent noninterlaced video lines by frame in time, the sequentially scanned television signal is converted into a recorded television signal with an interlaced field in each vertical segment, which is included in the original noninterlaced television signal. A recorded picture scene representing the entire picture or the entire area, the top and bottom, and the left / right of the taken picture scene. Thus, in each longitudinal segment of FIG. 11, the frame of the recorded interlaced television signal is located adjacently with a field A derived from the first frame of the non-interlaced television signal and a field B derived near the second frame, close to time. It consists of two interlaced fields A and B recorded on the slope track. For example, field A may have radix lines 1, 3, 5. n, 593,595,... Where n is an radix integer, while B is an even line 2, 4, 6,... n + 1,... 594,596,... It includes. The pixel resolution recorded in each vertical segment is, for example, 1/2 or smaller pixel resolution of the original picture scene.

FIG. 12 shows a recording / reproducing system embodying the features of the present invention, which may be used to record or reproduce a magnetic tape constructed in accordance with the format shown in FIG. For example, when operating in the recording mode, the noninterlaced video signal V _PR is connected to terminal 130. The video signal V _PR may be generated in a conventional manner by a camera system sequentially scanned to generate 625 noninterlaced video lines per picture at a frame repetition rate of 50 frames per second. Thus, the total number of video lines per frame of the non-interlaced video signal V _PR is similar to the number of frames of the video line for the PAL standard. However, since the non-interlaced video signal V _PR, the frame rate f _v will be twice the standard PAL, while the line rate is the rate of 2f _H twice the PAL line standard of f _H.

The video signal V _PR may be in analog or digital form, may be a monochromatic or color signal, and if it is a color signal, it may be either in a composite or component form. Further, if the video signal V _PR is in component form, it may be time division multiplexed in the signal channel, or in the form of separate channel components, as in its component MAC format, where for each vertical segment, the separate converter is A scanner configuration similar to the third figure is assigned to each of the Y, I and Q component signals. If the video signal V _PR is configured in the form of a separate channel component, the processing step shown in FIG. 12 is duplicated in each component channel.

In the recording mode of the recording / reproducing system 120 of FIG. 12, the arms of the recording / reproducing switches RP1 and RP2 contact their recording terminals R, respectively. The noninterlaced video signal V _PS passes through terminal 128.

FIG. 13A shows the video line number for the non-interlaced non-ideal signal V _PS 'starting with any video line number that is the same line number associated with the radix integer line number in FIG. Because of the noninterlacing nature of the video signal V _PS ', the duration of a given video line is 1 / 2f _H.

A non interlaced video signal V _PS is a single pole (pole) to the clock -3 manner as a module to a clock signal 2f _H ck, there is applied to the poles of the three-throw switch S1, a clock rate of 2f _H ck is 2f _H. FIG. 13A shows the duration and the contact holding position of Im Ar of the modulo -3 draw switch S1 based on the video line number of the video signal V _PS generated at the terminal 128. Thus, when video line n appears at terminal 128, arm Ar is only in contact with D1; When video line n + 1 appears at terminal 128, female Ar contacts terminal D2, and when video line n + 2 appears at terminal 128, female Ar contacts terminal D3. This contact sequence is repeated modulo reference.

The contacts D1 to D3 are connected to the first ends of the memories M1 to M3, each memory having a memory capacity for storing line values of pixels according to a desired desired pixel resolution. Each other end of the memories M1 to M3 is connected to each of the contacts C1 to C3 of the double pole switch S2 comprising an arm Ap connected to the pole P and an arm Ag connected to the pole Q. The arm of the switch S2 is rotated counterclockwise in a modulo 3 manner by the clock signal f _H 'ck supplied by the timing circuit 122.

It is a double pole and double draw switch S3 has a pole R connected to pole P of switch S2 and a pole S connected to pole Q of switch S2. The arm of the switch S3 switches between the linear connection position and the dotted contact position at the frame rate of the non-interlaced video signal V _PS in accordance with the clocks fr and ck. Thus, for example, while the video line of frame 1 of the non-interlaced video signal V _PS appears, the arm of the switch S3 is in a linear contact position; On the other hand, in the next frame, frame 2, the arm is in the dotted contact position. Therefore, during frame 1, the video signal V1 generated at the contact terminal B1 of the switch S3 is equal to the video signal V _P generated at the pole P of the switch S2, and the video signal V2 generated at the contact terminal B2 is the pole Q of the switch S2. The video signal generated by 2 continues as it is.

Each of the memories M1 to M3 may be configured as a first-in first-out (FIFO) memory. Each memory has the ability to signal in both directions for input / output functions that depend on specific internal memory read / write clocking configurations. For example, each memory may have two parallel delay lines operated in a ping-pong manner between read and write functions by multiplexer steering stages connected at both ends of each delay line. 12. In the operation of the write mode of the system, the ends of the memories M1 to M3 connected to each of the terminals D1 to D3 serve as signal inputs, while the other end of the memory connected to each of the terminals C1 to C3 serves as a memory input. do.

In order to write the signal samples to memories M1 to M3, the timing unit 122 supplies the write clocks WR1 and CK to the memory M1, the write clocks WR2 and CK to the memory M2 and the write clocks WR3 and CK to the memory M3. . In order to read the signal samples from the memories M1 to M3, the timing section 122 provides the read clocks R1 and CK to the memory M1, the read clocks R2 and CK to the memory M2 and the read clocks R3 and CK to the memory M3. In the terminal 128 the non-interlaced video signal V _PS is generated in the write operation mode, you video line 1, 2, 3, of the interlaced video signal V _PS ... n,… Synchronizing the Generation of the Write and Read Clocks with a Sequence of and Frequency and Phase Synchronizing the 2f _H 'ck Signal, the F _H ck Signal, and the fr'ck Signal for Associated Horizontal and Vertical Blanking Intervals of the Non-Interlaced Video Signal V _PS Is connected to the timing unit 122.

13C to 13E show the contents of the memories M1 to M3 as a function of the video line number in the noninterlaced video signal V _PS . Line n of video signal V _PS appears at terminal 128 and when arm Ar of switch S1 is gradually at D1, line n is written to memory M1. When the arm Ar continues to stay at the contact terminals D2 and D3, the line n survives the memory M1 for the next two noninterlaced lines. When line n-1 of video signal V _PS appears at terminal 128, female Ar is at contact terminal D2, and line n-1 is written to memory M2 by each write clock. When the arm Ar remains at the contact terminals D3 and D1, line n-1 survives the memory for the next two noninterlaced lines. When line n-2 of video signal V _PS appears at terminal 128, female Ar is at contact terminal D3, and line n + 2 is written to memory M3 by each write clock. When the arm Ar stays at the contact terminals D1 and D2, the line n + 2 is lost in the next two noninterlaced lines of memory M3. When female Ar is at contact terminal D1, the modulo -3 cycling of switch S1 is repeated and line n + 3 is written to memory M1.

The signals stored in the memories M1 to M3 read the memory continuously in accordance with the switching of the arms Ap and Aq between the contacts C1 to C3 of the switch S2. The read rate of each memory is half the write rate, and the line value of the memory is equal to the residence time at each of the contact terminals C1 to C3 of each of the arms Ap and Aq as shown in Figs. 13f and 13g. f _H is read.

In the synchronous readout of the memories M1 to M3, the line n stored in the memory M1 and the line n-1 stored in the memory M2 have the arm Ap at the contact terminal C1 and the arm Aq contacted as indicated in Figs. 13f to 13i. When at terminal C2, it is read by each read clock. For proper reading, the synchronization operation is carried out by the terminal 128 of the lines n-2 and n-3 of the non-interlaced video signal V _PS of FIG. 13a having a dwell time at the contacts C1 and C2 for reading the stored lines n and n + 1. The operation is synchronized during generation in succession.

In the next sequential arm position of the switch S2, the arm Ap stays at the contact terminal C3 and the arm Aq stays at the contact terminal C1. At this contact point, stored line n + 2 is read from memory M3 and stored line n + 3 is read from memory M1. In the final sequential contact position of switch S2, for a given modulo -3 cycle of operation, arm Ap stays in contact terminal C2 and arm Aq stays in contact terminal C3. This causes stored line n + 4 to be read from memory M2 and stored line n + 5 to be read from memory M3.

As a result of the synchronous operation of the switches S1 to S3 and the memories M1 to M3 described above, the non-interlaced video signal V _PS is converted into two separate, interlaced video signals V1 and V2. In frame 1 of non-interlaced video signal V _PS , interlaced video signal V1 includes the odd numbered line of the frame, field A, and interlaced video signal V2 includes the even numbered line, field B. In frame 2 of the non-interlaced video signal V _PS , when the arm of the switch S3 is in the dotted contact position shown in FIG. 12, the interlaced video signal V1 includes the video line of field B and the interlaced video signal V2 is of the field A. Include a line.

The interlaced video signal V1 is applied to the record / play electronic stage 126, and the video signal V2 is applied to the record / play electronic stage 127, both of which are in recording mode to generate the interlaced video signal Vi1 and the interlaced video signal Vi2, respectively. Is operated. The video signals Vi1 and Vi2 are suitably adjusted for recording on the vertical segments 1 and 2 of the magnetic tape of FIG. 11 by a scanner device having respective scanner converter stages 123 and 124.

The configuration of the scanner device 129 is similar to that of the scanner device shown in FIG. 3, with the lower level transducers Y ₁ , Y ₃ , I ₁ , Q ₁ combined with the transducer stage 123 of FIG. The transformers Y ₂ , Y ₄ , I ₂ , Q ₂ are coupled with the converter stage 124. The tape wrap angle of the syringe device 129 may be similar to the nearly 360 ° wrap angle of the omega (Ω) wrap shown in FIG. 3 or may be a full 360 wrap angle provided in the alpha (α) wrap configuration.

The bidirectional flow of control signals is a timing element of FIG. 12 and a scanner and captain servo control stage 125 that controls the recording and replay of cue and headwheel control track pulses, which may be combined with the scanner device 129 in a conventional manner. Provided between 122, its track not shown in FIG. Also, in Fig. 11, any separation track not shown can be used.

In order to reproduce the non-interlaced video signal V! PS? Recorded on the magnetic tape of FIG. 11, the recording / reproducing system 120 of FIG. 12 is in the reproduction mode with the arms of the switches RP1 and RP2 in contact with the respective reproduction terminals PB. Is operated on. When the recording / reproducing system 120 is in the recording mode, the heads of the converter stages 123 and 124 of the scanner device 129 are connected from the scanner device 129 to terminals which are substantially opposite the signal flows described above. And pick up the recorded in-track signals of each longitudinal segment 1 and 2 to generate a signal flow. The synchronization operation of the switches S1 to S3 and the memories M1 to M3 is substantially the same as the recording mode and the reproduction mode described above. Therefore, the description of the operation has not been repeated.

Interlaced video signals Vi1 and Vi2 sensed from the respective longitudinal segment tracks by converter stages 123 and 124 are combined into a sequential noninterlaced video line of the reconstructed noninterlaced video signal V _PS appearing at terminal 128. Vertical and horizontal sync components are generated at terminal 128 by sync generator 121 receiving vertical and horizontal timing information from timing section 122, in accordance with control track and cue track information provided by control stage 125. To a noninterlaced video signal. In this way, the reconstructed noninterlaced video signal V _PS with full horizontal and vertical sync information is generated by the recording / reproducing system 120 at the current output signal line from the recorded track of the vertical segment of FIG.

If the portable unit is used to reproduce the recorded magnetic tape of Fig. 11, the recording / reproducing system is to be used having a scanner device capable of watching the track to only one of the longitudinal segments, such as the longitudinal segment 1 of Fig. 11. It may be. The syringe device in the portable regeneration unit may consist of a smaller number of transducers required to regenerate only one terminal of the longitudinal segment in a syringe device configuration similar to that shown in FIG. The playback unit supplies an interlaced video signal, such as interlaced video signal V1, which is directly applied to the sync generator for insertion of sync information to generate an interlaced playback television signal. The interlaced television signal includes interlaced video lines representing the entire area of the picture scene contained in the recorded interlaced video signal, as a whole representing all tracks in both segments of the FIG. 11 magnetic tape.

Thus, the reproduction unit provides a quick conversion from the progressively scanned television format to the interlaced scanning television format without using a field storage size memory. When only one vertical segment of the magnetic tape of FIG. 11 is reproduced as a trade off, the resolution of the interlaced video signal supplied is the coarse resolution, which is the resolution of the original noninterlaced video signal in the vertical direction. This is because half the pixel resolution.

Claims (4)

A recording system for recording a video signal on a magnetic tape, the recording system for recording information in a first segment of a pair of vertical tape segments in a plurality of helical tracks that divide the width of the tape along the tape length. A first transducer stage 123 arranged, a second transducer stage 124 arranged to record information in a second segment of the pair of longitudinal tape segments in the plurality of inclined tracks, and information about the scanned scene A video signal recording system having an input terminal (130) for receiving a video signal consisting of successive video lines for supplying a video signal, said control being in response to synchronization information of said video signal, said alternating line of said video lines Information from the first converter stage and information from the remaining lines of the video lines. The video signal recording system according to claim 1, further comprising an information supply means for supplying to the second converter stage. The method of claim 1, wherein the continuous video lines received at the input terminal comprise noninterlaced (interlaced) video lines of a continuous frame of a rogressively scanned television signal. The control of the supply means allows the even lines of the frame between the alternating frames and the odd lines of the alternating frame of the sequentially scanned signal to be recorded in the first vertical tape segment, and of the frame between the even lines of the alternate frame and the alternating frame Since odd lines are written to the second vertical tape segment, the information from one of the vertical tape segments supports the interlaced display of the scanning scene, and the information by using the information from the two vertical tape segments. Noninterlaced, sequential scan display of the scene Video signal recording system, characterized in that a displayed. A recording system of a magnetic recording tape which records a non-interlaced video line of progressively scanned television signals representing a scanned scene, the magnetic recording tape having a pair of longitudinal tape segments dividing the width of the tape along the length of the tape; Even lines of frames between alternating frames and odd lines of alternating frames of a sequentially scanned signal are written to a first segment of the pair of longitudinal tape segments in a plurality of oblique tracks, the even lines of the alternating frames. In a reproduction system of a magnetic recording tape in which odd lines of frames between a and alternating frames are recorded on a second one of the pair of longitudinal segments in a plurality of inclined tracks, recording only on one segment of the pair of longitudinal tape segments. Converter to scan tracks End, only in response to the scanning of the scene with the magnetic recording tape of the reproducing system according to claim 1, further comprising a signal generating means for generating a system output signal that supports interlaced displays the signals recovered by the transducer means. A recording system of a magnetic recording tape which records a non-interlaced video line of progressively scanned television signals representing a scanned scene, the magnetic recording tape having a pair of longitudinal tape segments dividing the width of the tape along the length of the tape; Even lines of frames between alternating frames and odd lines of alternating frames of a sequentially scanned signal are written to a first segment of the pair of longitudinal tape segments in a plurality of oblique tracks, the even lines of the alternating frames. In the reproduction system of a magnetic recording tape in which the odd lines of frames between the frame and the alternating frame are recorded on a second one of the pair of longitudinal tape segments in a plurality of slope tracks, the first segment of the pair of longitudinal tape segments To scan recording tracks to Converter means, second converting means means for scanning recording tracks to a second segment of said pair of longitudinal tape segments, and said scanning scene in response to a signal recovered by said first and second converter means; And a signal generating means for generating a system output signal supporting the interlaced display.

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