{"id":7234,"date":"2020-05-26T15:40:09","date_gmt":"2020-05-26T15:40:09","guid":{"rendered":"http:\/\/longkft.hu\/audioblog\/?p=7234"},"modified":"2021-04-19T07:03:27","modified_gmt":"2021-04-19T07:03:27","slug":"megmertek-a-placebot","status":"publish","type":"post","link":"https:\/\/longkft.hu\/audioblog\/megmertek-a-placebot\/","title":{"rendered":"Megm\u00e9rt\u00e9k a placeb\u00f3t!"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">A k\u00fcl\u00f6nb\u00f6z\u0151 k\u00e1belek szerepe a hang- \u00e9s videotechnik\u00e1ban rendk\u00edv\u00fcl k\u00e9nyes t\u00e9ma. Olyan t\u00e9mak\u00f6r, amivel kapcsolatban szinte k\u00e9ptelens\u00e9g norm\u00e1lis besz\u00e9lget\u00e9seket, el\u0151bbre viv\u0151 eszmecser\u00e9ket folytatni a minden k\u00e1beles topikban el\u0151szeretettel f\u00e9szket rak\u00f3, a t\u00e9mak\u00f6rben nulla tapasztalattal rendelkez\u0151, \u00e1m mindent tud\u00f3 l\u00e9nyek miatt. M\u00e9g tal\u00e1n a hangsz\u00f3r\u00f3- \u00e9s IC-k\u00e1belek l\u00e9tjogosults\u00e1ga a legink\u00e1bb elfogadott, az ezekkel kapcsolatos besz\u00e9lget\u00e9sek gerjesztik a legkevesebb, \u00e1m ann\u00e1l hevesebb vit\u00e1kat &#8211; de azt\u00e1n ha sz\u00f3ba ker\u00fcl a hangsz\u00f3r\u00f3k\u00e1belek al\u00e1t\u00e1maszt\u00e1s\u00e1nak probl\u00e9mak\u00f6re, borul a bili \u00e9s olyanok, akik m\u00e9g sohasem hallottak nemhogy k\u00e1bel-al\u00e1t\u00e1maszt\u00e1st, de m\u00e9g dedik\u00e1ltan hangsz\u00f3r\u00f3k\u00e1belnek k\u00e9sz\u00fclt vezet\u00e9ket sem, eg\u00e9sz p\u00e1ly\u00e1s let\u00e1mad\u00e1ssal rombolj\u00e1k sz\u00e9t a kialakul\u00f3 besz\u00e9lget\u00e9seket.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">A &#8222;tank\u00f6nyvi hifits\u00e1k&#8221;, mint v\u00e9res kardot hordozz\u00e1k az el\u0151re kit\u00f6lt\u00f6tt t\u00edpusmondatukat &#8211; no de, hol a m\u00e9r\u00e9s, hol vannak a fizikai k\u00e9pletek? Valahogy arr\u00f3l mindig elfelejtkeznek, hogy a hifist\u00e1k, a zenehallgat\u00f3k \u00e1ltal felfedezett jelens\u00e9gek magyar\u00e1zata, a m\u00f6g\u00f6ttes fizikai t\u00f6rv\u00e9nyszer\u0171s\u00e9gek megkeres\u00e9se nem a h\u00e9tk\u00f6znapi hifist\u00e1k, hanem pl. a &#8222;tank\u00f6nyvi&#8221; \u00e9s a &#8222;m\u00e9rn\u00f6khifist\u00e1k&#8221; feladata lenne. Azonban \u0151k jobban szeretik az egymondatos klis\u00e9j\u00fcket &#8222;copy-paste&#8221; m\u00f3don v\u00e9g n\u00e9lk\u00fcl ism\u00e9telni, minthogy b\u00e1rmit kipr\u00f3b\u00e1ljanak, b\u00e1rmit megtapasztaljanak, vagy \u00e9ppen b\u00e1rmin elgondolkodjanak.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">Szerencs\u00e9re vannak nyitottabb &#8222;m\u00e9rn\u00f6khifist\u00e1k&#8221;, azaz hifista m\u00e9rn\u00f6k\u00f6k is, akik a zene \u00e9s a hifi szeretete mellett el\u00e9g nyitottak ahhoz, hogy elektrofizikai, sz\u00e1m\u00edt\u00e1stechnikai, stb. tud\u00e1sukkal megkeress\u00e9k egy-egy szokatlan jelens\u00e9g fizikai magyar\u00e1zat\u00e1t, \u00e9s annak ismeret\u00e9ben a jelens\u00e9get, a szokatlan eszk\u00f6zt ne csak meg\u00e9rts\u00e9k, hanem m\u00e9g fel is jav\u00edts\u00e1k.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">No de t\u00e9rj\u00fcnk vissza a hangsz\u00f3r\u00f3k\u00e1belek al\u00e1t\u00e1maszt\u00e1s\u00e1hoz.<\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">Akik kipr\u00f3b\u00e1ltunk k\u00fcl\u00f6nb\u00f6z\u0151 al\u00e1t\u00e9teket hangsz\u00f3r\u00f3k\u00e1beleink alatt, mindny\u00e1jan tapasztaltuk, hogy azok kisebb-nagyobb m\u00e9rt\u00e9kben hat\u00e1ssal vannak a hangk\u00e9pre. L\u00e9teznek gy\u00e1ri olcs\u00f3bb-dr\u00e1g\u00e1bb t\u00edpusok, valamint l\u00e9teznek fill\u00e9res diy-megold\u00e1sok is. B\u00e1rmelyiket is pr\u00f3b\u00e1ltuk, azt tapasztaltuk, hogy bizony a hangsz\u00f3r\u00f3k\u00e1belek (sem) szeretnek a f\u00f6ld\u00f6n k\u00edgy\u00f3zva fek\u00fcdni. Mindegy, hogy az a bizonyos f\u00f6ld parketta, padl\u00f3sz\u0151nyeg, vagy \u00e9ppen k\u0151padl\u00f3.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">Az al\u00e1t\u00e9tek okozta v\u00e1ltoz\u00e1st szinte mindenki a mechanikus rezg\u00e9sekkel hozta kapcsolatba. Mivel a hangsz\u00f3r\u00f3k\u00e1belben a hang elektronok meghat\u00e1rozott rezg\u00e9s\u00e9vel terjed &#8211; jut el az er\u0151s\u00edt\u0151t\u0151l a hangsug\u00e1rz\u00f3ig -, abszol\u00fat logikusnak t\u0171nik, hogy ha cs\u00f6kkentj\u00fck a k\u00e1belt \u00e9r\u0151 k\u00fcls\u0151 rezg\u00e9sek mennyis\u00e9g\u00e9t, kevesebb zavarhat\u00e1s \u00e9ri a hanginform\u00e1ci\u00f3t tov\u00e1bb\u00edt\u00f3 elektronrezg\u00e9st.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">Az ut\u00f3bbi id\u0151ben sz\u00fcletett a k\u00e1beltart\u00f3k pozit\u00edv hat\u00e1s\u00e1val kapcsolatban egy m\u00e1sik \u00e9s igaz\u00e1n \u00e9rdekes magyar\u00e1zat is. Felismerve azt a t\u00e9nyt, hogy a hangsz\u00f3r\u00f3k\u00e1belekben (is) az energia\u00e1raml\u00e1s a k\u00e1belek k\u00f6r\u00fcli t\u00e9rben is t\u00f6rt\u00e9nik m\u00e1gneses energiak\u00e9nt, \u00edgy logikus, hogy minden, ami ezt a m\u00e1gneses teret megbontja, hat\u00e1ssal van a k\u00e1belben fut\u00f3 hasznos jelre. Ez\u00e9rt nem mindegy pl. a vezet\u0151anyagot bor\u00edt\u00f3 szigetel\u0151anyag milyens\u00e9ge.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">Az eddig felsorolt lehets\u00e9ges \u00e9s egyben egyre ink\u00e1bb elfogadott magyar\u00e1zatokra azonban m\u00e9g nem tal\u00e1ltam semmif\u00e9le m\u00e9r\u00e9st. Azaz, ez \u00edgy nem teljesen igaz, mert pl. v\u00e9gtelen hossz\u00fas\u00e1g\u00fa k\u00e9pleteket l\u00e1ttam m\u00e1r, melyekkel megpr\u00f3b\u00e1lt\u00e1k kisz\u00e1molni a szigetel\u0151anyag tulajdons\u00e1gait, de abb\u00f3l m\u00e9g nem igaz\u00e1n lehetett k\u00f6vetkeztetni, az adott szigetel\u0151anyag hangk\u00e9pre gyakorolt hat\u00e1s\u00e1ra.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">Az egyik olvas\u00f3- \u00e9s egyben levelez\u0151t\u00e1rs azonban felh\u00edvta a figyelmemet egy rendk\u00edv\u00fcl \u00e9rdekes vide\u00f3ra, melyben bizony megm\u00e9rik egy konkr\u00e9t \u00e9s fill\u00e9res k\u00e1bel-al\u00e1t\u00e1maszt\u00f3 hat\u00e1s\u00e1t &#8211; b\u00e1r \u00fagy v\u00e9lem, a m\u00e9r\u00e9sb\u0151l ink\u00e1bb az der\u00fcl ki, milyen hat\u00e1ssal van az adott hangsz\u00f3r\u00f3k\u00e1belre, ha azt r\u00f6videbb-hosszabb szakaszon elemelik a k\u0151padl\u00f3t\u00f3l.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">A vide\u00f3n szerepl\u0151 m\u00e9r\u00e9ssorozatban \u00e9s a kapott eredm\u00e9nyben az a zseni\u00e1lis, hogy az nem a szokv\u00e1nyos rezg\u00e9ssel, vagy a szigetel\u0151anyaggal kapcsolatos elm\u00e9letre \u00e9p\u00fcl, hanem eg\u00e9szen \u00faj szemsz\u00f6gb\u0151l vizsg\u00e1lja a k\u00e1beltart\u00f3k hat\u00e1s\u00e1t, \u00e9s teszi azt m\u00e9rhet\u0151v\u00e9 \u00e9s az elektrofizika &#8222;eszk\u00f6zeivel&#8221; magyar\u00e1zhat\u00f3v\u00e1.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">Azt val\u00f3sz\u00edn\u0171leg mindenki tudja, hogy a vezet\u00e9keknek van ellen\u00e1ll\u00e1suk (egyen\u00e1ram eset\u00e9n) \u00e9s van impedanci\u00e1juk (v\u00e1ltakoz\u00f3 frekvenci\u00e1j\u00fa \u00e1ram eset\u00e9n). A m\u00e9r\u00e9s sor\u00e1n, azonban egy kev\u00e9sb\u00e9 k\u00f6zismert jellemz\u0151t, az adott hangsz\u00f3r\u00f3vezet\u00e9k kapacit\u00e1s\u00e1t m\u00e9rt\u00e9k a padl\u00f3n, valamint k\u00fcl\u00f6nb\u00f6z\u0151 hosszban a talajt\u00f3l elemelve (al\u00e1t\u00e1masztva).<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">A m\u00e9r\u00e9s egy\u00e9rtelm\u0171 eredm\u00e9nyt hozott &#8211; \u00edgy mostant\u00f3l kijelenthetj\u00fck, hogy a k\u00e1bel-al\u00e1t\u00e1maszt\u00e1sok hat\u00e1sa m\u00e9rhet\u0151, teh\u00e1t mindazok, akik placeb\u00f3t ki\u00e1ltottak vel\u00fck kapcsolatban, vagy \u00e1ll\u00e1spontjukat lesznek k\u00e9nytelenek megv\u00e1ltoztatni, vagy az kell megem\u00e9szteni\u00fck, hogy a &#8222;placeb\u00f3 m\u00e9rhet\u0151 fizikai jelens\u00e9g&#8221;.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">No de, hogyan is hathat a hangk\u00e9pre a f\u00f6ld\u00f6n hever\u0151 hangsz\u00f3r\u00f3k\u00e1belen m\u00e9rt magasabb \u00e9s az onnan elemelt helyzetben m\u00e9rt alacsonyabb kapacit\u00e1s?<\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">K\u00e9tf\u00e9le m\u00f3don is jelentkezik a hat\u00e1s. El\u0151sz\u00f6r is, az er\u0151s\u00edt\u0151k t\u00f6bbs\u00e9ge &#8211; f\u0151leg a kicsi, gyenge t\u00e1pegys\u00e9g\u0171 t\u00edpusok &#8211; nagyon nem cs\u00edpik ha a hangsz\u00f3r\u00f3-kimenet\u00fcket kapacit\u00e1ssal terhelik. Ez\u00e9rt be is vezett\u00e9k, hogy az er\u0151s\u00edt\u0151k teljes\u00edtm\u00e9ny\u00e9t nem puszt\u00e1n ellen\u00e1ll\u00e1son m\u00e9rik, hanem azt kieg\u00e9sz\u00edtik egy kapacit\u00edv terhel\u00e9ssel is (valamint a jel f\u00e1zis\u00e1t +\/- 60 fokban eltolj\u00e1k). Bizony, az er\u0151s\u00edt\u0151k t\u00f6bbs\u00e9g\u00e9n \u00edgy eg\u00e9szen m\u00e1s teljes\u00edtm\u00e9ny \u00e9s torz\u00edt\u00e1si adatok m\u00e9rhet\u0151ek, pedig ezzel imit\u00e1lj\u00e1k legink\u00e1bb, hogy az adott er\u0151s\u00edt\u0151 mit is fog csin\u00e1lni val\u00f3j\u00e1ban, ha hangsug\u00e1rz\u00f3t k\u00f6tnek r\u00e1juk.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">A kommerszebb gy\u00e1rt\u00f3k k\u00e9sz\u00fcl\u00e9kei \u00e9s persze az agyonrekl\u00e1mozott hm-er\u0151s\u00edt\u0151k eset\u00e9ben ez\u00e9rt a kapacit\u00edv terhel\u00e9s hat\u00e1s\u00e1t, valamint az un. kockadiagramot ink\u00e1bb megtartj\u00e1k maguknak, \u00edgy a v\u00e1s\u00e1rl\u00f3 csak otthon szembes\u00fcl azzal, hogy pl. a 100 Wattos er\u0151s\u00edt\u0151je az adott hangsug\u00e1rz\u00f3n bizonyos frekvenci\u00e1kon 10-15 Wattot is alig tud kipr\u00e9selni mag\u00e1b\u00f3l.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">Visszat\u00e9rve a k\u00e1belelemel\u00e9sn\u00e9l m\u00e9rhet\u0151 kapacit\u00e1sv\u00e1ltoz\u00e1sra, meg\u00e1llap\u00edthatjuk, hogy a padl\u00f3t\u00f3l elemelt hangsz\u00f3r\u00f3vezet\u00e9k kisebb kapacit\u00e1s\u00e1t minden er\u0151s\u00edt\u0151 kisebb torz\u00edt\u00e1ssal \u00e9s nagyobb kimen\u0151teljes\u00edtm\u00e9nnyel &#8222;h\u00e1l\u00e1l&#8221; meg. Persze vannak er\u0151s\u00edt\u0151k, melyeknek mindegy, mert m\u00e9retes t\u00e1pegys\u00e9g\u00fcknek, j\u00f3l meg\u00e9p\u00edtett kimenet\u00fcknek k\u00f6sz\u00f6nhet\u0151en \u00e9szre sem veszik a k\u00fcl\u00f6nbs\u00e9get, valamint vannak er\u0151s\u00edt\u0151k, melyeknek meg teljesen mindegy, mit csin\u00e1lunk, mert azokat legink\u00e1bb csak er\u0151lk\u00f6d\u0151nek h\u00edvhatn\u00e1nk. A k\u00e9t v\u00e9glet k\u00f6z\u00f6tt azonban sz\u00e1mtalan k\u00e9sz\u00fcl\u00e9k l\u00e9tezik.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">Van azonban egy m\u00e1sik gond is. A k\u00e1belkapacit\u00e1s hat\u00e1ssal van a k\u00e1belben fut\u00f3 frekvenci\u00e1k energiaszintj\u00e9re is. A vide\u00f3n l\u00e1that\u00f3 m\u00e9r\u00e9s sor\u00e1n m\u00e9rt pF nagys\u00e1grend\u0171 kapacit\u00e1s bizony m\u00e1r a hallhat\u00f3 frekvencias\u00e1vba is belesz\u00f3l, a felharmonikusokr\u00f3l nem is besz\u00e9lve. Tal\u00e1n ez lehet a legfontosabb oka annak, hogy akik elemelik a talajt\u00f3l a k\u00e1beleiket els\u0151sorban a t\u00e9r\u00e9rzet javul\u00e1s\u00e1t emelik ki &#8211; mert min\u00e9l t\u00f6bb, min\u00e9l egyenletesebb felharmonikust k\u00e9pes a hangsz\u00f3r\u00f3k\u00e1bel \u00e1tvinni (\u00e9s a rendszer megjelen\u00edteni) ann\u00e1l t\u00f6bb a t\u00e9rinform\u00e1ci\u00f3.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span style=\"font-size: 12pt;\">A kicsit hossz\u00fara ny\u00falt bevezet\u0151 ut\u00e1n a l\u00e9nyeg az al\u00e1bbi vide\u00f3ban l\u00e1that\u00f3:<\/span><\/h3>\n<div style=\"width: 1270px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-7234-1\" width=\"1270\" height=\"714\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"http:\/\/longkft.hu\/audioblog\/wp-content\/uploads\/2020\/05\/10000000_700348774060351_2060382906598838109_n.mp4?_=1\" \/><a href=\"http:\/\/longkft.hu\/audioblog\/wp-content\/uploads\/2020\/05\/10000000_700348774060351_2060382906598838109_n.mp4\">http:\/\/longkft.hu\/audioblog\/wp-content\/uploads\/2020\/05\/10000000_700348774060351_2060382906598838109_n.mp4<\/a><\/video><\/div>\n<span>Megosztom:<\/span><br><a target=\"_blank\" class=\"facebook\" title=\"\" rel=\"external\" href=\"https:\/\/www.facebook.com\/share.php?u=https:\/\/longkft.hu\/audioblog\/megmertek-a-placebot\/&title=Megm\u00e9rt\u00e9k a placeb\u00f3t!\"><\/a><a target=\"_blank\" class=\"linkedin\" title=\"\" rel=\"external\" 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Most olvastam a(z) Megm\u00e9rt\u00e9k a placeb\u00f3t!  c\u00edm\u0171 cikket a(z) Longaudio  oldalon. Hivatkoz\u00e1s:  https:\/\/longkft.hu\/audioblog\/megmertek-a-placebot\/\" title=\"\"><\/a><a class=\"nyomtatas\" title=\"\" href=\"http:\/\/www.printfriendly.com\" onclick=\"window.print();return false;\"><\/a>","protected":false},"excerpt":{"rendered":"<p>A k\u00fcl\u00f6nb\u00f6z\u0151 k\u00e1belek szerepe a hang- \u00e9s videotechnik\u00e1ban rendk\u00edv\u00fcl k\u00e9nyes t\u00e9ma. 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