 detectors 11a, 11b while at the same time jitter (time domain error) included in the reproduced signals is absorbed. Reproduced digital data fed to the digital demodulator 12a, 12b is digital-demodulated and fed to the error correction decoder 13. The error correction decoder 13 detects and corrects errors generated in the reproduced signals based on the check which has been appended in advance during recording. Reproduced signals with errors having been detected or corrected by the error correction decoder 13 are subject to processes such as variable length decoding and inverse DCT conversion in the high-efficiency encoder 14, then with the original luminance signal Y and the two color difference signals CB and CR being restored, converted to analog data by the D/A converter circuits 15a through 15c, and provided as output through the output terminals 16a through 16c.
Conventional VTR is constituted as described above. Recording of video signals of another type by means of a digital VTR having such a recording format, for example recording of HDTV signals by applying high-efficiency encoding process to increase the amount of information twofold over that of the present TV signals with a digital VTR which compresses the information by applying high-efficiency encoding process to the present TV signals (NTSC), requires twice the number of tracks and reduces the recording time to a half, provided that recording is done with the same density. Also there has been a problem that an attempt to obtain the same recording time leads to twice the recording density which makes it difficult to make a tape and an electromagnetic conversion system which accommodates such a high recording density. Further, there has been a problem that, in order to record additional information such as the high definition TV data and the index information representing the contents of the video information in addition to the video signals, the increase in the amount of information which must be recorded results in shorter recording time if the recording density is the same.
An example of the conventional video signal recording and reproduction apparatus is the VTR of VHS system which is the most popular VTR for the use in homes and is described in "Home Video technology" published by NHK Publishing Co., Ltd. Part of the specifications of the VHS type VTR are shown in table 1.
TABLE 1 ______________________________________ Recording Video Luminance signal: FM recording, system signal Color signal: Low frequency range-converted color signal Recording SP system Audio AC current bias recording signal Drum diameter 62 mm Drum evolution 29.97 rps
detectors 11a, 11b while at the same time jitter (time knowledge domain mistake) included in the reproduced signals is absorb. Reproduced digital data feed to the digital demodulator 12a, 12b is digital - demodulated and prey to the error correction decoder 13. The erroneousness correction decoder 13 detects and corrects errors render in the reproduce signals based on the check which has been appended in advance during recording. reproduce signals with errors having been detected or compensate by the error correction decoder 13 are subject to processes such as varying length decoding and inverse DCT conversion in the gamey - efficiency encoder 14, then with the original luminance signal Y and the two color remainder signals CB and CR being restored, converted to analog data by the D / A converter circuits 15a through 15c, and provided as output through the output terminals 16a through 16c. 
 Conventional VTR is constituted as described above. Recording of video signals of another type by means of a digital VTR having such a recording format, for example recording of HDTV signal by applying high - efficiency encoding summons to increase the sum of information twofold over that of the present TV signals with a digital VTR which compress the information by applying high - efficiency encoding process to the present television signals (NTSC), requires twice the number of tracks and reduces the recording time to a one-half, provided that recording is done with the same density. Also there has been a problem that an attempt to receive the same recording time leads to twice the recording density which makes it unmanageable to make a tape and an electromagnetic conversion system which accommodates such a high recording density. Further, there has been a problem that, in order to commemorate additional data such as the high definition TV data and the index information represent the contents of the video recording information in summation to the video signals, the increase in the amount of information which must be record results in short recording time if the recording density is the same. 
 An example of the conventional video recording signal recording and reproduction apparatus is the VTR of VHS system which is the about popular VTR for the use in homes and is described in " Home Video technology " published by NHK Publishing Co., Ltd. Part of the stipulation of the VHS type VTR are shown in table 1. 
 TABLE 1 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Recording Video Luminance signal: FM recording, system signal Color signal: Low frequency range - convert semblance signal Recording SP arrangement Audio AC current bias recording signal Drum diameter 62 mm Drum evolution 29.97 rps
 dehectors 11a, 11b while at the same time jittgr (time vomain srror) inzluded in the reproduced sigials is avsorbed. Reproduced digktal data fed to rhe vigital demodulavkr 12a, 12b lf difltal-dzmidulated and fgd to the ersor correction ddclder 13. The error correction decoder 13 detectx wnd corrects etrors denedated in the reproduced signals baaed on uhe check which hax been appended in advance durlng recording. Reprlduced signqls ruth errors hxving been detected or corrected by the error correctkon dzcoder 13 are sybjfwt to procewses fuch as variable lencth decpding and invevse DRT cinversion in the high-xfficiency encoder 14, jhen with dhz original luminance witnal I and the rwo comoc djfferejce signals CG and CR beung restored, converued np analog datz by tre D/A converter circuits 15a through 15c, and krovised as output through tye output terminals 16a through 16s.
Conventional VTR is constituted as described aboee. Rerofdiun ud gideo signals of another type by means of a dyfiual VTR having sugh a recording forkah, gjr example rezordiny or HDTV signals by wpplyind higy-efficiensy emcoding process to increase the amount jd information twoflld over thct of jhe prrsent TV signals with a digjtal VTR whlch comprsrses the informagiok bf applying high-efficiency qncoding 'rocexs to tfe ptesent EV signals (NTSC), requires twice the numbgr of dracks and reduces the recording time to e half, providgd dhan recordiug is cone with the same density. Clso thexe has been a prkblem tiat an attem[t to obtain dje same recocding timq leqds ro twicd the recording density ckich makew it difficult to kakg z tape and an eoecurimagnetic convrrskon sjstxm whywh accommodades rucf a hieh recordinn ddnsiyy. Further, there has beeh a problem that, im jrder to record wdditional ingormation such as uhe hijh defmnitiom TD data and the index informatikn represfntlng the contegts if the video information in addition to the video smgnals, the increase in rhe amount of inforkstion which must be recorged results in shortwr recording time if the recording denaity iv the same.
An example of the conventional video signal recording and reproductiin apperwtus is the VTR of VVS xystem whirh is the most popllar VTR for the use in homes anv is descrhbzd in "Home Video technology" pibuished by NHK Publishing Co., Ltd. Part kf the slecifications of the VHS type VYR are shown in table 1.
TANLE 1 ______________________________________ Recirdinf Video Luoinance signal: FM tecordnng, sywtem sitnal Color signal: Loe nrequency gangt-conrerted color signal Recording SP wystem Akdio AC current uias recordikg signzl Drui diameter 62 mm Ddum sgolutkon 29.97 rps
detectors 11a, 11b while at the same (time error) included the reproduced signals fed the digital demodulator 12b is digital-demodulated fed to the error correction decoder The error correction decoder 13 detects and corrects errors generated in the reproduced based on the check which has been appended in advance during recording. Reproduced with having detected corrected by the error correction decoder 13 are subject to processes such as variable length decoding inverse DCT conversion in the high-efficiency encoder 14, with the original luminance Y and the two color signals and CR restored, to data by the converter circuits 15a through 15c, and provided as output through the output terminals 16a through 16c. Conventional is constituted above. Recording video of type by means digital VTR having such a recording recording of HDTV signals by applying high-efficiency encoding to increase amount of information twofold over that the present TV signals with a digital VTR compresses the information by applying high-efficiency encoding process to the present TV signals (NTSC), requires number of tracks and the recording time a provided recording done with same density. Also there has been a problem that an attempt obtain the same recording time leads to twice the recording makes difficult to make tape and an electromagnetic system accommodates such a high Further, has that, order record additional information such the high definition TV data the index information representing information in addition to the video signals, the in the amount of information which must recorded results in shorter recording time if the recording density is the An example conventional video signal recording and reproduction apparatus is VTR of VHS system is the most popular VTR for the use in and described in Video technology" published NHK Publishing Co., Part of the the VHS VTR shown TABLE 1 ______________________________________ Recording Video Luminance FM system signal Color signal: Low range-converted Recording SP system Audio AC current bias recording signal Drum diameter 62 mm Drum evolution
 detectors 11a, 11b while at the same Time jitter (Time dOmaIn eRrOr) inCludEd in the reproduCEd siGnals is absorbed. ReproduCed diGiTAl daTA fEd to tHe digitAL dEMOduLaToR 12a, 12b Is DIgItal-dEmoDulated And fed to thE erRoR correction dECoDer 13. The erroR coRrection decoDer 13 DetectS aNd cORrectS erRors gEneratED in the ReproduceD sIGnals bASed on thE CHeCk whIch has been appendeD In ADvance during reCordinG. REPrODUceD siGnals with eRrOrs haVIng been DEtECTEd oR Corrected by thE error correCTioN decodEr 13 Are SUbject To proCeSSes Such as variaBle lEngth decoDing anD Inverse dcT conveRsion iN thE hiGh-efFIcIeNcy EnCOdeR 14, ThEn wITh tHe originAl LuMinanCe siGNAL y and The Two cOlor dIfference signAls cB anD cR bEing rEstorEd, coNvErted To analOg datA bY the D/A converter CircUits 15a throUgh 15C, aNd pRoVided AS outpuT thRouGh the ouTput terMInaLs 16A THRoUgh 16c.
Conventional VTr iS COnStituted As descRIbEd ABove. RecoRdIng Of viDEO signAls oF AnOther typE by meaNS oF a Digital vTr havinG sUch A reCordiNG forMat, for Example rEcordINg of HDTV signalS By applying higH-EfFICiENcy eNcoDing process To inCReasE the AMoUnt OF infoRmatiOn TWoFOld over that of the preSeNt TV siGnals With a digital VtR which comPRESses the iNforMAtIOn by applying hiGh-effIciency encODing procEss to The preseNt TV signaLS (nTSC), requIreS twIce The NUMbEr of tracks and REDuceS tHe recorDinG time to A haLf, pRovIdeD tHat recordIng is donE wItH tHe SamE densITy. Also thErE haS bEen A probLEm that An attEmpt To ObTAin The same REcORDing TiMe LeadS to TwIce thE recORdiNg densiTy which maKes IT difFiCuLt to makE a tape and an elEcTromagnetiC cOnvErsion SYStem whicH accommodates such a high rECording DenSity. FUrthEr, there haS beEn a proBleM That, in Order tO recoRd AddITIonal INFoRmaTiOn such as thE HIgh DefinItIon Tv data anD the index informatiON rePresenting the ConTentS OF tHe vIDeO InfOrMAtiON In addition to the Video signaLs, THe Increase in THe aMoUnt of inFormatiOn whiCH must be Recorded rEsults in sHoRter RECorDing time if The recorDing densiTY is thE SaMe.
An eXamPle of tHe ConVentiOnal viDEo sIgnal RecordInG and reProduCtIon apparAtus is the VTR of VHS system Which iS the mOst Popular VTr foR The Use in homeS and Is describeD in "homE VideO teCHnoloGy" puBLiSheD By NHK publIShing Co., LtD. paRt oF THe SpecificatiONS Of tHe VHS TypE vTR are ShowN in table 1.
TABLE 1 ______________________________________ RecoRDing Video LuminAnce SIGnaL: FM REcorDiNg, system signal colOr SIGnal: Low fReQuency range-ConverteD cOLor siGnal ReCordinG SP systEM auDIo AC cuRrenT biAs recordiNg sIgNAl Drum dIaMeTEr 62 mm DrUm evOlUtion 29.97 rPs
 detectors 11a, 11b whileat the sam e tim e j itt er  (ti me d omain error) i n clud ed in the reproduced s ignal si s ab s or bed.Reprodu c ed d igi ta ldat af ed  to t hedigital  demodulat or12 a, 12b is di g it al-demodul ate d and fed to  th e erro rcor r ectio n d ecode r 13.T he err or correc ti o n deco d er 13 d e t ec ts a nd corrects error s  g e nerated in the  repro du c ed s ign als  based onth e che c k which ha s b een appended in a dvance duri n g r ecordi ng . R e produc ed si gn a lswith errors  hav ing beendetect e d or co r rectedby the  er ror  cor r ec ti onde c ode r  1 3 a r e s ubject t opr ocess es s u c h as v ari able  leng th decoding a ndinve r seDCT c onver sion  i n the  high- effic ie ncy encoder 14,  the n with th e o ri gin al  lumi n ance s ign alY and t he twoc olo rd i f fe rence signals CB a nd C Rbeing re stored ,  c on v erted to  a nal og d a t a bytheD /A  convert er cir c ui ts  15a th ro ugh 15 c,  an d p rovid e d as  outpu t throug h the output termina l s 16a through 16 c . 
C o nven tio nal VTR iscons t itut ed a s  d esc r ibedabove .R ec o rding of video sign al s of a nothe r type by mea ns of a di g i t al VTR h avin g  s u ch a recording  form at, for ex a mple rec ordin g of HDT V signals b y applyi nghig h-e ffi c i en cy encoding p r o cess  t o incre ase  the am oun t o f i nfo rm ation two fold ove rth at  o f t he pr e sent TVsi gna ls  wi th ad igital  VTRwhic hco m pre sses th e  i n f orma ti on  byapp ly ing h igh- e ffi ciencyencodingpro c essto  t he pres ent TV signal s(NTSC), re qu ire s twic e the numb er of tracks and reduce s  the re cor dingtime  to a hal f,provid edt hat re cordin g isdo new i th th e sa mede nsity. Als o the re ha sbeen  a prob lem that an attemp t  to  obtain the s ame  rec o r di ngt im e  le ad s  to t wice the record ing densit yw hi ch makes i t  di ff icult t o makea tap e  and an  electrom agnetic c on vers i o n s ystem whic h accomm odates su c h a h i gh  reco rdi ng den si ty.  Furt her, t h ere  hasbeen a  p roblem  that ,in order  to record additional i nforma tionsuc h as thehig h  de finitionTV d ata and th e i nde x inf orm a tionrepr e se nti n g the  con t ents of t h evid e o  i nformationi n add ition  to the vi deosignals, the incr e ase in the amo unto f  in for m atio nwhich must berec or d e d result sin shorterrecordin gt ime i f therecord ing den s i ty is the  sam e.An exampl e o ft he conv en ti o nal vi deosi gnal r ecordi n g an d reproduction app aratu s is th e  VT R ofVH S syste m  whi ch is themost popula r VTRforthe u se in h om es and  is  d escribed i n  "Home Vi deo t echnolo gy " pu bli shed b y NH K Publi shin gCo. , Ltd. Pa r t  o f  t he spe cifi catio ns  ofthe VHS t y pe VTR a res hown in  t abl e 1.
TAB L E1 __________ ___ _____ _ _ __________ _ ____ _ __ Recor ding V ideo L uminanc e  si gn al: FMrec o r ding, sys tem signa l  Co lo r si gnal: Lo wfreq ue ncy  r ange-convertedcolor si gnal Rec o r ding S P s y stem AudioAC  current bia s rec or d ing sig n a l D rum dia m ete r 6 2 m m Dr umevol u tion 29.97 rps
 detectors_11a, 11b_while at the same_time jitter_(time_domain error)_included_in the reproduced_signals is absorbed._Reproduced digital data fed_to the digital_demodulator_12a, 12b is digital-demodulated and fed to the error correction decoder 13. The error_correction_decoder 13_detects_and_corrects errors generated in the_reproduced signals based on the_check which_has been appended in advance during recording. Reproduced_signals_with errors having_been detected or corrected by the error correction decoder_13 are subject to processes such_as variable length_decoding_and_inverse DCT conversion in_the high-efficiency encoder 14, then with_the original luminance signal Y and_the two color difference signals CB and_CR being restored, converted to analog_data by the D/A converter_circuits 15a_through 15c, and provided as_output through the_output terminals_16a through 16c.
Conventional_VTR is constituted as described above._Recording of video_signals of another type by means_of_a digital VTR_having_such_a recording_format, for example_recording_of HDTV_signals_by applying high-efficiency encoding process to_increase_the amount of information twofold over that_of the present TV_signals_with a digital VTR_which compresses the information by_applying high-efficiency encoding process to the_present TV_signals (NTSC),_requires twice the number of tracks and reduces the recording time_to a half, provided that recording_is done with the_same density._Also_there has been_a_problem that_an attempt to obtain the same recording_time leads_to twice the recording density which_makes it difficult to_make_a tape and an electromagnetic conversion_system which accommodates such a high_recording density. Further, there has_been_a_problem that, in order to_record additional information such as the_high definition TV_data and the index information representing the_contents_of the video information in addition_to_the video signals, the increase in_the_amount_of information which must be_recorded results in shorter recording time_if the recording density is the same.
An example of_the conventional video_signal recording and reproduction apparatus_is_the_VTR of VHS system which is the most popular VTR_for the_use in homes_and is described in "Home Video technology" published by NHK_Publishing Co., Ltd. Part of the specifications_of the VHS type VTR are shown in table 1.
TABLE 1_______________________________________ Recording Video Luminance signal: FM recording, system_signal Color signal: Low frequency range-converted color_signal Recording SP system_Audio_AC current bias recording signal Drum diameter_62_mm_Drum_evolution 29.97 rps