# US 5,710,857 A · Edit seaming in a video data recording/reproducing apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,710,857 A - Document ID: US5710857A - Status: Granted - Kind: A - Application number: 08/290,289 - Filed: 1994-08-15 - Granted: 1998-01-20 - Earliest claimed: 1992-02-28 - Assignees: Mitsubishi Denki Kabushiki Kaisha - Inventors: Tatsuo Yamasaki; Junichi Nose - Web page: https://patentgrep.com/patent/US5710857A ## CPC - G11B 27/036: Insert-editing - G11B 27/3027: {used signal is digitally coded} - H04N 5/926: by pulse code modulation (H04N5/919 takes precedence) - G11B 27/032: on tapes (G11B27/036, G11B27/038 take precedence) - G11B 2220/90: Tape-like record carriers - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract In recording one frame of video data in a plurality of tracks, high-frequency components of the video data are recorded in first and last ones of the plurality of tracks while low-frequency components thereof are recorded in the other tracks. In an editing/recording operation, a first frame of video data is recorded twice for first two consecutive frame periods after the start of the recording, and a last frame of video data is recorded twice for last two consecutive frame periods before the end of the recording. In a reproducing operation, one frame of video data is not used immediately before and after the start of the editing/recording operation and immediately before and after the end of the editing/recording operation. ## Claims ### Claim 1 A method of seaming first and second video data segments recorded onto a linearly displaceable video recording medium, said first and second video data segments each including at least one video data portion having a pair of video data portion edges, said method comprising: a) dividing each video data portion into low frequency and high frequency data portions; and b) storing each said video data portion on a plurality of consecutive tracks including a pair of edge tracks on the linearly displacement video recording medium while storing only said high frequency data portion on at least one edge track, said step b) including, i) recording said first video data segment on said linearly displaceable video recording medium, and ii) recording said second video data segment on said linearly displaceable video recording medium with the edges of said video data portions of said second video data segment being in substantial alignment with the edges of said video data portions of said first video data segment at a seam between said first and second video data segments; conditions caused by slight misalignment of the edges of said video portions of said first and second video data segments in said step b)ii) causing loss of at most said high frequency data portion located on an edge track immediately adjacent said seam, thereby losing only high frequency video information in the video portions immediately adjacent the seam. ### Claim 2 (depends on 1) The method of claim 1 wherein the method of seaming includes forming seams by insert and assembly editing. ### Claim 3 (depends on 1) The method of claim 1 wherein each video data portion is a video frame or field. ### Claim 4 (depends on 1) The method of claim 1 wherein said video recording medium is a video tape. ### Claim 5 (depends on 1) The method of claim 1 wherein said step b) stores said high frequency data portions on both of said pair of edge tracks. ### Claim 6 (depends on 1) The method of claim 1 wherein said step a) includes transform coding each video data portion to produce said low and high frequency data portions. ### Claim 7 (depends on 6) The method of claim 6 wherein said transform coding is discrete cosine transform coding. ### Claim 8 (depends on 1) The method of claim 1 wherein said conditions caused by slight misalignment of the edges of said video portions include track thinness and same azimuth remnant. ### Claim 9 (depends on 1) The method of claim 1 wherein each video data portion is a video frame including a pair of video fields, a portion of said high frequency data portions associated with each video field being stored on each of said edge tracks. ### Claim 10 (depends on 1) The method of claim 1 further comprising, c) encoding each divided video data portion with a parity check scheme prior to said step b). ### Claim 11 During recording and reproducing and reproducing, a method of seaming first and second video data segments onto and from a linearly displaceable video recording medium, said first and second video data segments each including at least one video data portion having a pair of video data portion edges, said method comprising: a) driving each video data portion into low frequency and high frequency data portions; and b) storing each divided video data portion on a plurality of consecutive tracks including a pair of edge tracks on the linearly displaceable video recording medium while storing only said high frequency data portions on at least one edge track, said step b) including, i) recording said first video data segment on said linearly displaceable video recording medium, and ii) recording said second video data segment on said linearly displaceable video recording medium with the edges of said video data portions of said video second data segment being in substantial alignment with the edges of said video data portions of said first video data segment at a seam between said first and second video data segments; conditions caused by slight misalignment of the edges of said video portions of said first and second video data segments in said step b)ii) causing loss of at most said high frequency data portion located on an edge track immediately adjacent said seam, thereby losing only high frequency video information in the video portions immediately adjacent the seam; c) reproducing the high frequency and low frequency data portions of said video data portions stored in said step b); d) determining a number of errors in each high frequency data portion containing edge track reproduced in said step c); e) deleting the high frequency data portion stored in a said edge track where said number of errors determined by said step d) exceeds a threshold value; and f) combining the low frequency data portion and any high frequency data portion of each said video data portion to recover the stored first and second video data segments. ### Claim 12 (depends on 11) The method of claim 11 wherein the method of seaming includes forming seams by insert and assembly editing. ### Claim 13 (depends on 11) The method of claim 11 wherein each video data portion is a video frame or field. ### Claim 14 (depends on 11) The method of claim 11 wherein said video recording medium is a video tape. ### Claim 15 (depends on 11) The method of claim 11 wherein said step b) stores said high frequency data portions on both of said pair of edge tracks. ### Claim 16 (depends on 11) The method of claim 11 wherein said step a) includes transform coding each video data portion to produce said low and high frequency data portions. ### Claim 17 (depends on 16) The method of claim 16 wherein said transform coding is discrete cosine transform coding. ### Claim 18 (depends on 11) The method of claim 11 wherein said conditions caused by slight misalignment of the edges of said video portions include track thinness and same azimuth remnant. ### Claim 19 (depends on 11) The method of claim 11 wherein each video data portion is a video frame including a pair of video fields, a portion of said high frequency data portions associated with each video field being stored on each of said edge tracks. ### Claim 20 (depends on 11) The method of claim 11 further comprising, c) encoding each divided video data portion with a parity check scheme prior to said step b); said step d) determining the number of errors through use of said parity check scheme. ### Claim 21 An apparatus for seaming first and second video data segments during recording onto a linearly displaceable video recording medium, said first and second video data segments each including at least one video data portion having a pair of video data portion edges, said apparatus comprising: a data divider dividing each video data portion into low frequency and high frequency data portions; and modulator means, responsive to output of said data divider, for storing each divided video data portion on a plurality of consecutive tracks including a pair of edge tracks on the linearly displaceable video recording medium while storing only said high frequency data portions on at least one edge track; said modulator means recording said first video data segment on said linearly displaceable video recording medium, recording said second video data segment on said linearly displaceable video recording medium with the edges of said video data portions of said second video data segment being in substantial alignment with the edges of said video data portions of said first video data segment at a seam between said first and second video data segments; conditions caused by slight misalignment of the edges of said video data portions of said first and second video data segments stored by said modulator means causing loss of at most said high frequency data portion located on an edge track immediately adjacent said seam, thereby losing only high frequency video information in the video portions immediately adjacent the seam. ### Claim 22 (depends on 21) The apparatus of claim 21 wherein the apparatus for seaming forms seams by insert and assembly editing. ### Claim 23 (depends on 21) The apparatus of claim 21 wherein each video data portion is a video frame or field. ### Claim 24 (depends on 21) The apparatus of claim 21 wherein said video recording medium is a video tape. ### Claim 25 (depends on 21) The apparatus of claim 21 wherein said modulator means stores said high frequency data portions on both of said pair of edge tracks. ### Claim 26 (depends on 21) The apparatus of claim 21 wherein said data divider transform codes each video data portion to produce said low and high frequency data portions. ### Claim 27 (depends on 21) The apparatus of claim 21 wherein said conditions caused by slight misalignment of the edges of said video portions include track thinness and same azimuth remnant. ### Claim 28 (depends on 21) The apparatus of claim 21 wherein each video data portion is a video frame including a pair of video fields, said modulator means storing a portion of said high frequency data portions associated with each video field on each of said edge tracks. ### Claim 29 A recording and reproducing apparatus which seams first and second video data segments during recordation onto and reproduction from a linearly displaceable video recording medium, said first and second video data segments each including at least one video data portion having a pair of video data portion edges, said apparatus comprising: a data divider dividing each video data portion into low frequency and high frequency data portions; and modulator means, responsive to output of said data divider, for storing each divided video data portion on a plurality of consecutive tracks including a pair of edge tracks on the linearly displaceable video recording medium while storing only said high frequency data portions on at least one edge track; said modulator means recording said first video data segment on said linearly displaceable video recording medium, recording said second video data segment on said linearly displaceable video recording medium with the edges of said video data portions of said second video data segment being in substantial alignment with the edges of said video data portions of said first video data segment at a seam between said first and second video data segments; conditions caused by slight misalignment of the edges of said video data portions of said first and second video data segments when recorded by said modulator means causing loss of at most said high frequency data portions located on an edge track immediately adjacent said seam, thereby losing only high frequency video information in video portions immediately adjacent the seam; demodulator means for reproducing the high frequency and low frequency data portions of said video data portions stored in said memory medium; an error counter determining a number of errors in each high frequency data portion containing edge track reproduced by said demodulator means; means, responsive to said error counter, for deleting the high frequency data portions stored in a said edge track where said number of errors determined by said error counter exceeds a threshold value; and means for combining the low frequency data portions any high frequency data portions of each said video data portion to recover the stored first and second video data segments. ### Claim 30 (depends on 29) The apparatus of claim 29 wherein the apparatus for seaming forms seams by insert and assembly editing. ### Claim 31 (depends on 29) The apparatus of claim 29 wherein each video data portion is a video frame or field. ### Claim 32 (depends on 29) The apparatus of claim 29 wherein said video recording medium is a video tape. ### Claim 33 (depends on 29) The apparatus of claim 29 wherein said modulator means stores said high frequency data portions on both of said pair of edge tracks. ### Claim 34 (depends on 29) The apparatus of claim 29 wherein said data divider transform codes each video data portion to produce said low and high frequency data portions. ### Claim 35 (depends on 29) The apparatus of claim 29 wherein said conditions caused by slight misalignment of the edges of said video portions include track thinness and same azimuth remnant. ### Claim 36 (depends on 29) The apparatus of claim 29 wherein each video data portion is a video frame including a pair of video fields, said modulator means storing a portion of said high frequency data portions associated with each video field on each of said edge tracks. ### Claim 37 (depends on 29) The apparatus of claim 29 further comprising, an encoder encoding each divided video data portion with a parity check scheme prior to storing by said modulator means; said error counter determining said number of errors through use of said parity check scheme.