{"id":35159,"date":"2019-10-31T22:02:38","date_gmt":"2019-10-31T19:02:38","guid":{"rendered":"https:\/\/prohoster.info\/blog\/modifitsiruem-bluetooth-stek-dlya-uluchsheniya-zvuka-na-naushnikah-bez-kodekov-aac-aptx-i-ldac\/"},"modified":"2019-10-31T22:02:38","modified_gmt":"2019-10-31T19:02:38","slug":"modifitsiruem-bluetooth-stek-dlya-uluchsheniya-zvuka-na-naushnikah-bez-kodekov-aac-aptx-i-ldac","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/administrirovanie\/modifitsiruem-bluetooth-stek-dlya-uluchsheniya-zvuka-na-naushnikah-bez-kodekov-aac-aptx-i-ldac","title":{"rendered":"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><i>Para lexhimin k\u00ebt\u00eb artikull, rekomandohet t\u00eb lexoni artikullin e m\u00ebparsh\u00ebm: <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/427997\/\">Audio p\u00ebrmes Bluetooth: sa m\u00eb shum\u00eb informacione mbi profilet, kodek\u00ebt dhe pajisjet.<\/a><\/noindex><\/i><\/p>\n<p>Disa p\u00ebrdorues t\u00eb kufjeve pa tela raportojn\u00eb cil\u00ebsi t\u00eb ul\u00ebt t\u00eb z\u00ebrit dhe munges\u00eb t\u00eb frekuencave t\u00eb larta kur p\u00ebrdorin kodekun standard Bluetooth SBC, i cili mb\u00ebshtetet nga t\u00eb gjitha pajisjet audio. Nj\u00eb rekomandim i zakonsh\u00ebm p\u00ebr p\u00ebrmir\u00ebsimin e z\u00ebrit \u00ebsht\u00eb blerja e pajisjeve dhe kufjeve q\u00eb mb\u00ebshtesin kodek\u00ebt aptX dhe LDAC. K\u00ebta kodek\u00eb k\u00ebrkojn\u00eb taksa licencash, prandaj pajisjet me mb\u00ebshtetje p\u00ebr ta kushtojn\u00eb m\u00eb shum\u00eb.<\/p>\n<p>Duket se cil\u00ebsia e ul\u00ebt e SBC \u00ebsht\u00eb e p\u00ebrcaktuar nga kufizimet artificiale t\u00eb grupeve Bluetooth dhe konfigurimeve t\u00eb kufjeve, dhe ky kufizim mund t\u00eb anashkalohet n\u00eb \u00e7do pajisje ekzistuese, p\u00ebrmes ndryshimeve softuerike n\u00eb smartphone ose kompjuter.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Kodeku SBC<\/h2>\n<p>Kodeku SBC ka shum\u00eb parametra t\u00eb ndrysh\u00ebm q\u00eb p\u00ebrcaktohen n\u00eb faz\u00ebn e vendosjes s\u00eb lidhjes. Nd\u00ebr ta:<\/p>\n<ul>\n<li>Numri dhe lloji i kanaleve: Joint Stereo, Stereo, Dual Channel, Mono;<\/li>\n<li>Numri i grupeve frekuencash: 4 ose 8;<\/li>\n<li>Numri i blloqeve n\u00eb paket\u00eb: 4, 8, 12, 16;<\/li>\n<li>Algoritmi i shp\u00ebrndarjes s\u00eb bit\u00ebve gjat\u00eb kvantizimit: Loudness, SNR;<\/li>\n<li>Vlera maksimale dhe minimale e bitpool-it t\u00eb p\u00ebrdorur gjat\u00eb kuantizimit (bitpool): zakonisht, nga 2 deri n\u00eb 53.<\/li>\n<\/ul>\n<p>Dispositivi i dekodimit duhet t\u00eb mb\u00ebshtes\u00eb \u00e7do kombinim t\u00eb k\u00ebtyre parametrave. Dispositivi i kodimit mund t\u00eb mos realizoj\u00eb t\u00eb gjitha.<br \/>\nStek\u00ebt ekzistues Bluetooth zakonisht p\u00ebrputhen me profilin e m\u00ebposht\u00ebm: Joint Stereo, 8 banda, 16 blloqe, Loudness, bitpool 2..53. Ky profil kodon audio 44.1 kHz me nj\u00eb bitrate prej 328 kbit\/s.<br \/>\nParametri bitpool ndikon drejtp\u00ebrdrejt n\u00eb bitrate brenda nj\u00eb profili: sa m\u00eb i lart\u00eb t\u00eb jet\u00eb, aq m\u00eb i lart\u00eb \u00ebsht\u00eb bitrate, dhe p\u00ebr pasoj\u00eb, edhe cil\u00ebsia.<br \/>\nMegjithat\u00eb, parametri bitpool nuk \u00ebsht\u00eb i lidhur me nj\u00eb profil t\u00eb caktuar; ndikuese mbi bitrate jan\u00eb gjithashtu nj\u00eb s\u00ebr\u00eb parametrash t\u00eb tjer\u00eb: lloji i kanaleve, numri i bandave t\u00eb frekuencave, numri i blloqeve. Mund t\u00eb rritet bitrate n\u00eb m\u00ebnyr\u00eb indirekte, duke i p\u00ebrputhur profilet jo standarde, pa ndryshuar bitpool.<\/p>\n<p><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/4836fdb65b1204173bd6e01ef2d0cc6c.svg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>\n<i>Formula p\u00ebr llogaritjen e bitrate SBC<\/i><\/p>\n<p>\nP\u00ebr shembull, m\u00ebnyra Dual Channel kodon kanalet ve\u00e7mas, duke p\u00ebrdorur t\u00ebr\u00eb bitpool-in p\u00ebr secilin nga kanalet. Duke e detyruar pajisjen t\u00eb p\u00ebrdor\u00eb Dual Channel n\u00eb vend t\u00eb Joint Stereo, ne do t\u00eb marrim nj\u00eb bitrate pothuajse t\u00eb dyfishuar me t\u00eb nj\u00ebjtin vler\u00eb maksimale bitpool: 617 kbit\/s.<br \/>\nSipas mendimit tim, p\u00ebrdorimi i vler\u00ebs bitpool, e cila nuk \u00ebsht\u00eb e lidhur me profilin gjat\u00eb negociatave, \u00ebsht\u00eb nj\u00eb mang\u00ebsi e standardit A2DP, e cila \u00e7oi n\u00eb nj\u00eb kufizim artificial t\u00eb cil\u00ebsis\u00eb SBC. Do t\u00eb ishte m\u00eb e arsyeshme t\u00eb negociohej bitrate, jo bitpool.<\/p>\n<p>Vlerat fikse t\u00eb Bitpool dhe Bitrate rrjedhin nga tabela e vlerave t\u00eb rekomanduara p\u00ebr p\u00ebrdorim p\u00ebr audio me cil\u00ebsi t\u00eb lart\u00eb. Por rekomandimi nuk \u00ebsht\u00eb nj\u00eb arsyetim p\u00ebr t'u kufizuar n\u00eb k\u00ebto vlera.<\/p>\n<p><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/1076b610245c4bcb88e5812bdea27e60.svg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSpecifikimi A2DP v1.2, i cili ishte aktiv nga 2007 deri n\u00eb 2015, k\u00ebrkon q\u00eb t\u00eb gjitha pajisjet dekoduese t\u00eb operojn\u00eb n\u00eb m\u00ebnyr\u00eb korrekte me bitratet deri n\u00eb 512 kbit\/s:<\/p>\n<blockquote><p>Dekoduesi i SNK duhet t\u00eb mb\u00ebshtes\u00eb t\u00eb gjitha vlerat e mundshme t\u00eb bitpool q\u00eb nuk rezultojn\u00eb n\u00eb tejkalimin e bitratit maksimal. Ky profil kufizon bitratin maksimal t\u00eb disponuesh\u00ebm n\u00eb 320 kbit\/s p\u00ebr mono dhe 512 kbit\/s p\u00ebr modulet me dy kanale.<\/p><\/blockquote>\n<p>N\u00eb versionin e ri t\u00eb specifikimit, nuk ka kufizime mbi bitratin. Supozohet se kufjet moderne, t\u00eb lansuara pas vitit 2015 dhe q\u00eb mb\u00ebshtesin EDR, mund t\u00eb mb\u00ebshtesin bitratet deri n\u00eb \u2248730 kbit\/s.<\/p>\n<p>P\u00ebr nj\u00eb arsye, staket Bluetooth t\u00eb verifikuar nga un\u00eb n\u00eb Linux (PulseAudio), Android, Blackberry dhe macOS kan\u00eb kufizime artificiale n\u00eb vler\u00ebn maksimale t\u00eb parametrit bitpool, i cili ndikon drejtp\u00ebrdrejt n\u00eb bitratin maksimal. Por kjo nuk \u00ebsht\u00eb problemi m\u00eb i madh, pothuajse t\u00eb gjitha kufjet gjithashtu e kufizojn\u00eb vler\u00ebn maksimale t\u00eb bitpool n\u00eb numrin 53.<br \/>\nSi\u00e7 kam arritur t\u00eb v\u00ebrtetoj, shumica e pajisjeve funksionojn\u00eb shk\u00eblqyesh\u00ebm n\u00eb nj\u00eb stak Bluetooth t\u00eb modifikuar me bitrat 551 kbit\/s, pa nd\u00ebrprerje dhe zhurm\u00eb. Por nj\u00eb bitrat i till\u00eb kurr\u00eb nuk do t\u00eb jet\u00eb i q\u00ebndruesh\u00ebm n\u00eb kushte normale, n\u00eb staket normale Bluetooth.<\/p>\n<h2>Modifikimi i stakut Bluetooth<\/h2>\n<p>N\u00eb \u00e7do stak Bluetooth q\u00eb \u00ebsht\u00eb kompatibil me standardin A2DP, ka mb\u00ebshtetje p\u00ebr modin Dual Channel, por aktivizimi i saj nga nd\u00ebrfaqja nuk \u00ebsht\u00eb i mundur.<\/p>\n<p>Le t\u00eb shtojm\u00eb nj\u00eb kalues n\u00eb nd\u00ebrfaqe! Un\u00eb kam b\u00ebr\u00eb patches p\u00ebr Android 8.1 dhe Android 9, t\u00eb cilat shtojn\u00eb mb\u00ebshtetje t\u00eb plot\u00eb p\u00ebr Dual Channel n\u00eb shtres\u00eb, shtojn\u00eb nj\u00eb modalitet n\u00eb menun\u00eb e kalimit t\u00eb modaliteteve n\u00eb mjetet e zhvilluesve, dhe trajtojn\u00eb SBC me mb\u00ebshtetje p\u00ebr Dual Channel si nj\u00eb kodek t\u00eb shtuar, si aptX, AAC ose LDAC (Android e quan k\u00ebt\u00eb HD Audio), duke shtuar nj\u00eb shenj\u00eb n\u00eb cil\u00ebsimet e pajisjes Bluetooth. Ja si duket kjo:<\/p>\n<p><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/5f14e2955f1dcaefa8ddc4b8fa413de1.svg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/review.lineageos.org\/q\/topic:bt-sbc-hd-dualchannel-pie+(status:open%20OR%20status:merged)\">Patch p\u00ebr Android 9<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/review.lineageos.org\/q\/topic:bt-sbc-hd-dualchannel+(status:open%20OR%20status:merged)\">Patch p\u00ebr Android 8.1<\/a><\/noindex><\/p>\n<p>Me aktivizimin e k\u00ebtij opsioni, audios Bluetooth fillon t\u00eb transmetohet me bit rate <b>551 kbit\/s<\/b>, n\u00ebse kufjet mb\u00ebshtesin lidhjen me shpejt\u00ebsi 3 mbit\/s, ose <b>452 kbit\/s<\/b>, n\u00ebse kufjet mb\u00ebshtesin vet\u00ebm 2 mbit\/s.<\/p>\n<p>Ky patch \u00ebsht\u00eb i p\u00ebrfshir\u00eb n\u00eb firmware alternative si:<\/p>\n<ul>\n<li><b>LineageOS<\/b><\/li>\n<li><b>Resurrection Remix<\/b><\/li>\n<li><b>crDroid<\/b><\/li>\n<\/ul>\n<h2>Nga erdh\u00ebn 551 dhe 452 kbit\/s?<\/h2>\n<p>Teknologjia e ndarjes s\u00eb eterit n\u00eb Bluetooth \u00ebsht\u00eb e destinuar p\u00ebr transmetimin e efektsh\u00ebm t\u00eb paketave t\u00eb m\u00ebdha me madh\u00ebsi fikse. Transmetimi i t\u00eb dh\u00ebnave ndodh n\u00eb slotet, me numrin m\u00eb t\u00eb madh t\u00eb slot\u00ebve q\u00eb d\u00ebrgohen n\u00eb nj\u00eb transfert\u00eb q\u00eb \u00ebsht\u00eb 5. Gjithashtu, ekzistojn\u00eb moda transmetimi q\u00eb p\u00ebrdorin 1 ose 3 slot\u00eb, por jo 2 ose 4. N\u00eb 5 slot\u00eb mund t\u00eb transmetohen deri n\u00eb 679 byte me shpejt\u00ebsi lidhjeje 2 mbit\/s dhe deri n\u00eb 1021 byte me shpejt\u00ebsi 3 mbit\/s, nd\u00ebrsa n\u00eb 3 slot\u00eb \u2014 367 dhe 552 byte p\u00ebrkat\u00ebsisht.<\/p>\n<p><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/c4596cb8ebdbaf2b57e201117e640f2f.svg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nN\u00ebse d\u00ebshirojm\u00eb t\u00eb transmetojm\u00eb m\u00eb pak t\u00eb dh\u00ebna se 679 ose 1021 byte, por m\u00eb shum\u00eb se 367 ose 552 byte, transmetimi do t\u00eb marr\u00eb gjithsesi 5 slot\u00eb, dhe t\u00eb dh\u00ebnat do t\u00eb d\u00ebrgohen n\u00eb t\u00eb nj\u00ebjt\u00ebn koh\u00eb, gj\u00eb q\u00eb ul efikasitetin e transmetimit.<\/p>\n<p><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/c9b0645c78d41d7d3a9879930c091d2a.svg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSBC n\u00eb m\u00ebnyr\u00ebn Dual Channel, n\u00eb audio 44100 Hz me parametra Bitpool 38, 16 blloqe n\u00eb tretman, 8 gam\u00eb frekuencash, kodon audio n\u00eb blloqe me madh\u00ebsi 164 byte, me bitrate 452 kbps.<br \/>\nAudio duhet t\u00eb inkapsulohet n\u00eb protokollet e transmetimit L2CAP dhe AVDTP, t\u00eb cilat marrin 16 byte nga ngarkesa audio e dobishme.<\/p>\n<p><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/2fd899e7b521497844e1354ae5f825eb.svg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>K\u00ebshtu, n\u00eb nj\u00eb transfert\u00eb Bluetooth me 5 slot\u00eb arrijn\u00eb t\u00eb p\u00ebrfshihen 4 blloqe audio:<\/p>\n<pre><code class=\"plaintext\">679 (EDR 2 mbit\/s DH5) - 4 (L2CAP) - 12 (AVDTP\/RTP) - 1 (koka SBC) - (164*4) = 6<\/code><\/pre>\n<p>\nNe kemi vendosur 11.7 ms t\u00eb t\u00eb dh\u00ebnave audio n\u00eb paket\u00eb d\u00ebrgimi, e cila do t\u00eb transferohet brenda 3.75 ms, dhe na kan\u00eb mbetur 6 byte t\u00eb pap\u00ebrdorur n\u00eb paket\u00eb.<br \/>\nN\u00ebse e rrisim pak bitpool-in, 4 kuadrate audio nuk do t\u00eb jen\u00eb m\u00eb n\u00eb gjendje t\u00eb paketohen n\u00eb nj\u00eb paket\u00eb. Do t\u00eb detyrohemi t\u00eb d\u00ebrgojm\u00eb 3 kuadrate n\u00eb \u00e7do her\u00eb, t\u00eb cilat ulin efikasitetin e transferimit, ulin sasin\u00eb e audios q\u00eb d\u00ebrgohet n\u00eb nj\u00eb paket\u00eb dhe do t\u00eb shkaktojn\u00eb m\u00eb shpejt ndalje n\u00eb audio n\u00eb kushte t\u00eb k\u00ebqija radiosh.<\/p>\n<p>N\u00eb t\u00eb nj\u00ebjt\u00ebn m\u00ebnyr\u00eb \u00ebsht\u00eb p\u00ebrcaktuar bitrate 551 kbit\/s p\u00ebr EDR 3 Mbit\/s: me Bitpool 47, 16 blloqe n\u00eb kuad\u00ebr, 8 gam\u00eb frekuencash, p\u00ebrfitojm\u00eb nj\u00eb madh\u00ebsi kuadri prej 200 byte, n\u00eb bitrate 551 kbit\/s. N\u00eb nj\u00eb paket\u00eb mb\u00ebshtetet 5 kuadra ose 14.6 ms muzik\u00eb.<\/p>\n<p>Algoritmi i llogaritjes s\u00eb t\u00eb gjitha parametrave SBC \u00ebsht\u00eb mjaft i komplikuar, mund t\u00eb konfuzohemi leht\u00ebsisht kur llogaritim manualisht, prandaj kam krijuar nj\u00eb kalkulator interaktiv p\u00ebr ata q\u00eb jan\u00eb t\u00eb interesuar: <noindex><a rel=\"nofollow\" href=\"https:\/\/btcodecs.valdikss.org.ru\/sbc-bitrate-calculator\/\">btcodecs.valdikss.org.ru\/sbc-bitrate-calculator<\/a><\/noindex><\/p>\n<h2>Pse \u00ebsht\u00eb nevoja p\u00ebr gjith\u00eb k\u00ebt\u00eb?<\/h2>\n<p>Kund\u00ebr mendimit t\u00eb zakonsh\u00ebm mbi cil\u00ebsin\u00eb e z\u00ebrit t\u00eb kodek\u00ebs aptX, n\u00eb disa skeda ai mund t\u00eb jap\u00eb rezultate m\u00eb t\u00eb dob\u00ebta se SBC me bitrate standard prej 328 kbit\/s.<\/p>\n<p>SBC ndan dinamikisht bitet e kvantizimit p\u00ebr grupe frekuencash, duke funksionuar sipas parimit \"nga posht\u00eb lart\". N\u00ebse e gjith\u00eb bitrate \u00ebsht\u00eb p\u00ebrdorur p\u00ebr frekuencat e ul\u00ebta dhe t\u00eb mesme, frekuencat m\u00eb t\u00eb larta do t\u00eb \"priten\" (n\u00eb vend t\u00eb tyre do t\u00eb ket\u00eb heshtje).<br \/>\naptX kvantizon grupet frekuencash me t\u00eb nj\u00ebjtin num\u00ebr bit\u00ebsh vazhdimisht, duke e b\u00ebr\u00eb at\u00eb me nj\u00eb bitrate t\u00eb q\u00ebndruesh\u00ebm: 352 kbit\/s p\u00ebr 44.1 kHz, 384 kbit\/s p\u00ebr 48 kHz, dhe nuk mund \"ta transferoj\u00eb bitin\" n\u00eb ato frekuenca q\u00eb kan\u00eb m\u00eb shum\u00eb nevoj\u00eb p\u00ebr to. N\u00eb dallim nga SBC, aptX nuk do t\u00eb \"priste\" frekuencat, por do t\u00eb shtonte zhurma kvantizimi n\u00eb to, duke reduktuar dinamik\u00ebn e audios dhe ndonj\u00ebher\u00eb duke sjell\u00eb krisje karakteristike. SBC, nga ana tjet\u00ebr, \"ha detaje\" - heq pjes\u00ebt m\u00eb t\u00eb qeta.<br \/>\nN\u00eb mesatare, n\u00eb krahasim me SBC 328k, aptX sjell m\u00eb pak distorzion n\u00eb muzik\u00ebn me nj\u00eb gam\u00eb t\u00eb gjer\u00eb frekuencash, por n\u00eb muzik\u00ebn me nj\u00eb gam\u00eb frekuencash t\u00eb ngusht\u00eb dhe nj\u00eb dinamik\u00eb t\u00eb gjer\u00eb, SBC 328k ndonj\u00ebher\u00eb fiton.<\/p>\n<p>Le ta shqyrtojm\u00eb nj\u00eb rast t\u00eb ve\u00e7ant\u00eb. Spektrogrami i nj\u00eb regjistrimi t\u00eb nj\u00eb loje n\u00eb piano:<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/er\/nq\/rc\/ernqrcwa0ic5mqwopjg5zbu_fxm.png\"><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/91247edc12764c6a4985e5a58ec1ad81.svg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p>Energjia kryesore p\u00ebrqendrohet n\u00eb frekuencat nga 0 deri n\u00eb 4 kHz, dhe vazhdon deri n\u00eb 10 kHz.<br \/>\nSpektrogrami i skedarit, i kompresuar n\u00eb aptX, duke dukur si n\u00eb vijim:<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/dl\/bl\/do\/dlbldoq_rdrjykephl2ostfbafk.png\"><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/aad46eb446ac9c5cffbd0ce8bd11e45b.svg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p>Kjo \u00ebsht\u00eb pamja e SBC 328k.<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/us\/3m\/ke\/us3mke0av1s_1ezkyk6ycq1g2vo.png\"><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/1b879741ea109c10c9e94a9a17830fc6.svg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p>Dallohet se SBC 328k her\u00eb pas here shk\u00ebputte plot\u00ebsisht gam\u00ebn mbi 16 kHz, duke shpenzuar gjith\u00eb bitratin e disponuesh\u00ebm n\u00eb gamat posht\u00eb k\u00ebtij vler\u00eb. Megjithat\u00eb, aptX solli m\u00eb shum\u00eb distorsione n\u00eb spektrin e frekuencave t\u00eb d\u00ebgjuara nga veshi njer\u00ebzor, gj\u00eb q\u00eb mund t\u00eb shihet n\u00eb spektrin origjinal t\u00eb zbritur nga spektri i aptX (m\u00eb e ndritshme, m\u00eb shum\u00eb distorsione):<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/ug\/-i\/5z\/ug-i5zpihrfnvumf9no_glecqna.png\"><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/7820015a2ef3c7f97802de179f2201eb.svg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p>Nd\u00ebrsa SBC 328k e prishi m\u00eb pak sinjalin n\u00eb gama nga 0 n\u00eb 10 kHz, pjesa tjet\u00ebr u pren\u00eb:<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/tf\/x8\/7z\/tfx87z8hpenx51spblrfvkc-ihe.png\"><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/793e3011a6aa07f1750cf0a5cca204cf.svg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p>Bitratit 485k SBC i mjaftoi p\u00ebr t\u00eb ruajtur gjith\u00eb gam\u00ebn e frekuencave, pa shk\u00ebputje t\u00eb bandes.<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/_c\/mc\/xy\/_cmcxyxwlf7u4tv-rbplwk5bmtu.png\"><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/27f215a26658b9b2bf3d852f4da96740.svg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p>SBC 485k n\u00eb k\u00ebt\u00eb kompozit\u00eb tejkalon ndjesh\u00ebm aptX n\u00eb gam\u00ebn 0-15 kHz, dhe me nj\u00eb ndryshim m\u00eb t\u00eb vog\u00ebl, por ende t\u00eb duksh\u00ebm \u2014 n\u00eb 15-22 kHz (m\u00eb e err\u00ebt, m\u00eb pak distorsione):<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/e-\/qz\/h8\/e-qzh8azmingcbhvuwxj8iptuau.png\"><img decoding=\"async\" alt=\"Modifikojm\u00eb stack-un Bluetooth p\u00ebr t\u00eb p\u00ebrmir\u00ebsuar z\u00ebrin n\u00eb kufjet pa kodek\u00ebt AAC, aptX dhe LDAC\" src=\"\/wp-content\/uploads\/2019\/06\/b65c37703ee677f561929ba714ed19ec.svg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/files.catbox.moe\/kpx711.zip\">Arkivi i audios origjinale, SBC dhe aptX<\/a><\/noindex>.<\/p>\n<p>Duke kaluar n\u00eb SBC me bitrat t\u00eb lart\u00eb, do t\u00eb merrni nj\u00eb tingull, shpesh superior ndaj aptX, n\u00eb \u00e7do pal\u00eb kufjesh. N\u00eb kufje q\u00eb mb\u00ebshtesin lidhjen EDR 3 Mb\/s, bitrati 551 kbit\/s ofron nj\u00eb tingull t\u00eb krahasuesh\u00ebm me aptX HD.<\/p>\n<h2>A mund t\u00eb ket\u00eb edhe m\u00eb shum\u00eb?<\/h2>\n<p>N\u00eb patch-in p\u00ebr Android ka gjithashtu nj\u00eb opsion p\u00ebr t\u00eb rritur m\u00eb shum\u00eb bitratin p\u00ebr pajisjet EDR n\u00eb 2 mbit\/s. Mund t\u00eb rritet bitrati nga 452 kbit\/s n\u00eb 595 kbit\/s, me koston e uljes s\u00eb stabilitetit t\u00eb transmetimit n\u00eb kushte t\u00eb komplikuara radio.<br \/>\nB\u00ebni mjaft t\u00eb vendosni variabl\u00ebn persist.bluetooth.sbc_hd_higher_bitrate n\u00eb vler\u00ebn 1:<\/p>\n<pre><code class=\"plaintext\"># setprop persist.bluetooth.sbc_hd_higher_bitrate 1<\/code><\/pre>\n<p>\nPatch-i p\u00ebr bitrat ekstrem \u00ebsht\u00eb d\u00ebgjuar deri tani vet\u00ebm n\u00eb LineageOS 15.1, por jo n\u00eb 16.0.<\/p>\n<h2>Kompatibiliteti me pajisjet<\/h2>\n<p>SBC Dual Channel mb\u00ebshtetet praktikisht nga t\u00eb gjitha kufjet, kolonat dhe pajisjet audio n\u00eb automjet. Nuk \u00ebsht\u00eb \u00e7udi \u2014 standardi parashikon mb\u00ebshtetje t\u00eb tij n\u00eb \u00e7do pajisje dekoduese. Ekziston nj\u00eb num\u00ebr i vog\u00ebl pajisjesh, ku ky modus shkakton probleme, por ato jan\u00eb raste t\u00eb vetme.<br \/>\nMund t\u00eb informoheni m\u00eb holl\u00ebsisht p\u00ebr pajisjet e kompatibilitetit n\u00eb <noindex>4pda<\/noindex> ose <noindex><a rel=\"nofollow\" href=\"https:\/\/forum.xda-developers.com\/android\/software-hacking\/improve-bluetooth-audio-quality-t3832615\">xda-developers<\/a><\/noindex>.<\/p>\n<h2>Krahasimi i ndryshimeve t\u00eb z\u00ebrit<\/h2>\n<p>Kam krijova nj\u00eb sh\u00ebrbim uebi q\u00eb kodon audio n\u00eb SBC (po ashtu edhe aptX dhe aptX HD) n\u00eb koh\u00eb reale, direkt n\u00eb shfletues. Me t\u00eb, do t\u00eb jeni n\u00eb gjendje t\u00eb krahasoni tingujt e profileve t\u00eb ndryshme SBC dhe kodek\u00ebve t\u00eb tjer\u00eb, pa e transmetuar realisht audion p\u00ebrmes Bluetooth-it, n\u00eb \u00e7do kufje, altoparlant\u00eb dhe muzik\u00ebn tuaj t\u00eb preferuar, dhe gjithashtu t\u00eb ndryshoni parametrat e kodimit gjat\u00eb repartit t\u00eb audios.<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/btcodecs.valdikss.org.ru\/sbc-encoder\/\">btcodecs.valdikss.org.ru\/sbc-encoder<\/a><\/noindex><\/p>\n<h2>Kontakti me zhvilluesit e Android<\/h2>\n<p>Kam shkruar shum\u00eb zhvilluesve t\u00eb stack-ut Bluetooth nga Google, duke k\u00ebrkuar t\u00eb shqyrtojn\u00eb p\u00ebrfshirjen e patch-eve n\u00eb deg\u00ebn kryesore t\u00eb Android - AOSP, por nuk kam marr\u00eb asnj\u00eb p\u00ebrgjigje. Patch-e e mia n\u00eb <noindex><a rel=\"nofollow\" href=\"https:\/\/android-review.googlesource.com\/q\/topic:bt-sbc-hd-dualchannel+(status:open%20OR%20status:merged)\">sistemin e pun\u00ebs me patch-e Gerrit p\u00ebr Android<\/a><\/noindex> po ashtu kan\u00eb mbetur pa komente nga ana e askujt t\u00eb involvuar.<br \/>\nDo t\u00eb isha i lumtur n\u00ebse do t\u00eb asistohesha n\u00eb lidhje me zhvilluesit nga Google dhe implementimin e SBC HD n\u00eb Android. Patch-e n\u00eb gerrit tashm\u00eb \u00ebsht\u00eb i vjetruar (\u00ebsht\u00eb nj\u00eb nga revisionet e hershme), dhe do ta p\u00ebrmir\u00ebsoj at\u00eb n\u00ebse zhvilluesit jan\u00eb t\u00eb interesuar n\u00eb ndryshimet e mia (nuk \u00ebsht\u00eb e leht\u00eb p\u00ebr mua ta p\u00ebrmir\u00ebsoj, nuk kam pajisje t\u00eb pajtueshme me Android Q).<\/p>\n<h2>P\u00ebrfundimi<\/h2>\n<p>P\u00ebrdoruesit e smartphone-ve me firmware t\u00eb LineageOS, Resurrection Remix dhe crDroid mund t\u00eb p\u00ebrfitojn\u00eb nga cil\u00ebsia e p\u00ebrmir\u00ebsuar e z\u00ebrit tashm\u00eb, mjafton t\u00eb aktivizoni opsionin n\u00eb cil\u00ebsimet e pajisjes Bluetooth. P\u00ebrdoruesit e Linux gjithashtu mund t\u00eb marrin nj\u00eb bit rate t\u00eb rritur SBC, duke instaluar <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freedesktop.org\/archives\/pulseaudio-discuss\/2019-June\/031168.html\">patchin nga Pali Roh\u00e1r<\/a><\/noindex>, i cili, p\u00ebrve\u00e7 t\u00eb tjerave, shton mb\u00ebshtetje p\u00ebr kodek\u00ebt aptX, aptX HD dhe FastStream.<br \/>\n<br \/>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/455316\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0435\u0440\u0435\u0434 \u043f\u0440\u043e\u0447\u0442\u0435\u043d\u0438\u0435\u043c \u044d\u0442\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0438 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u0442\u0441\u044f \u043e\u0437\u043d\u0430\u043a\u043e\u043c\u0438\u0442\u044c\u0441\u044f \u0441 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 \u0441\u0442\u0430\u0442\u044c\u0451\u0439: \u0410\u0443\u0434\u0438\u043e \u0447\u0435\u0440\u0435\u0437 Bluetooth: \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u043e \u043e \u043f\u0440\u043e\u0444\u0438\u043b\u044f\u0445, \u043a\u043e\u0434\u0435\u043a\u0430\u0445 \u0438 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u0445 \u041d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u043d\u0430\u0443\u0448\u043d\u0438\u043a\u043e\u0432 \u043e\u0442\u043c\u0435\u0447\u0430\u044e\u0442 \u043d\u0438\u0437\u043a\u043e\u0435 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u043e \u0437\u0432\u0443\u043a\u0430 \u0438 \u043d\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043e\u043a \u0432\u044b\u0441\u043e\u043a\u0438\u0445 \u0447\u0430\u0441\u0442\u043e\u0442 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0433\u043e Bluetooth-\u043a\u043e\u0434\u0435\u043a\u0430 SBC, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u044e\u0442 \u0432\u0441\u0435 \u0430\u0443\u0434\u0438\u043e\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430. \u0427\u0430\u0441\u0442\u043e\u0439 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0435\u0439 \u0434\u043b\u044f \u0443\u043b\u0443\u0447\u0448\u0435\u043d\u0438\u044f \u0437\u0432\u0443\u043a\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u043a\u0443\u043f\u043a\u0430 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u0438 \u043d\u0430\u0443\u0448\u043d\u0438\u043a\u043e\u0432 \u0441 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u043e\u0439 \u043a\u043e\u0434\u0435\u043a\u043e\u0432 aptX \u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-35159","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0435\u0440\u0435\u0434 \u043f\u0440\u043e\u0447\u0442\u0435\u043d\u0438\u0435\u043c \u044d\u0442\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0438 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u0442\u0441\u044f \u043e\u0437\u043d\u0430\u043a\u043e\u043c\u0438\u0442\u044c\u0441\u044f \u0441 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 \u0441\u0442\u0430\u0442\u044c\u0451\u0439: 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