Iskena kubhukwana lomkhiqizi - noma mhlawumbe ngisho nokupakisha okudayiswa kwedivayisi yomsindo - futhi kungenzeka ufunde isichazamazwi esibizwa ngokuthi i-Total Harmonic Distortion (esifingqiwe njenge-THD). Ungathola lokhu okubalwe kwizikhulumi, i-headphones, abadlali be-media / MP3, ama-amplifiers, ama-preamplifiers, abawamukeli , nokuningi. Ngokuyinhloko, uma kuhilela ukukhiqiza umsindo nomculo, kuya (kumele) kube nale ncazelo etholakalayo. Ukubhidlika okuphelele kweHarmonic kubalulekile uma ucabangela imishini, kodwa kuphela ekugcineni.
Kuyini Ukuphazamiseka KwamaHarmonic?
Ukuchazwa kwe-Total Harmonic Distortion yilapho efanisa izimpawu zokulalelwayo zokufaka nokukhipha, umahluko phakathi kwezigaba ezilinganiselwe njengephesenti. Ngakho-ke ungase ubone i-THD ebalwe njengamaphesenti angu-0.02 ngezimo ezicacisiwe zemvamisa kanye nomthamo olinganayo phakathi kwabazali emva kwayo (isib. 1 kHz 1 Vrms). Ngempela kunezibalo ezimbalwa ezihilelekile ukubala Ukuqhekeka Kwama Total Harmonic, kodwa konke okudingeka ukuyiqonda ukuthi amaphesenti amele ukuhlanekezela kwe-harmonic noma ukuphambuka kwesignali yokukhipha - amaphesenti aphansi angcono. Khumbula, isibonakaliso sokukhipha isakhi futhi asikho ikhophi ephelele yokufaka, ikakhulu lapho izingxenye eziningi zihileleke ohlelweni lokulalelwayo. Uma uqhathanisa lezi zimpawu ezimbili egrafu, ungase uqaphele umehluko omncane.
Umculo wenziwa ngamafomethi okuyisisekelo nama- harmonic . Ukuhlanganiswa kwamafomethi okuyisisekelo kanye nama-harmonic kunikeza izingoma zomculo esiyingqayizivele futhi ivumela indlebe yomuntu ukuba ihlukanise phakathi kwabo. Isibonelo, i-violin edlala i-A note esheshayo ikhiqiza imvamisa eyisisekelo ye-440 Hz ngenkathi iphinda ikhiqize ama-harmoniki (ukuphindaphinda kwevolumu eyinhloko) ku-880 Hz, 1220 Hz, 1760 Hz, njalonjalo. I-cello idlala phakathi okufanayo Inothi njengoba i-violin ibonakala sengathi i-cello ngenxa yamabonakude akhe ayisisekelo kanye nama-harmonic.
Kungani Ukuhlukunyezwa KwamaHarmonic Kubalulekile
Lapho ukuphazamisa okuphelele kweHarmonic sekuye kwadlula iphuzu elithile, ungalindela ukuthi ukuchithwa komsindo kukhishwe. Lokhu kwenzeka uma ama-frequencies angafuneki - angabonakali kwisignali yokufaka yangempela - akhiqizwa futhi anikezwe kumkhiqizo. Ngakho i-THD yamaphesenti angu-0.1 ingasho ukuthi amaphesenti angu-0.1 wesignali okukhiphayo ayimanga futhi aqukethe ukuphazamiseka okungadingeki. Ukuguqulwa okukhulu okunjalo kungaholela ekuhlangenwe nakho lapho izinsimbi zizwakala zingekho ezingokwemvelo futhi zingathandi ukuthi zifanele kanjani.
Kodwa empeleni, ukuHlelwa kweHarmonic okuphelele akukwazi ukuzwa ezindlebeni eziningi zabantu, ikakhulukazi njengoba abakhiqizi benza imikhiqizo enezici ze-THD eziyingxenyana encane yephesenti. Uma ungeke uzwe umehluko wephesenti wamaphesenti, ngakho-ke awukwazi ukubona isilinganiso se-THD samaphesenti angu-0.001 (okungaba nzima ukulinganisa ngokunembile, futhi). Akukhona lokho kuphela, kepha incazelo ye-Total Harmonic Distortion iyinani elilinganiselwe elingacabangi ukuthi i-harmonics ye-even-and-down elandelanayo iyanzima kangakanani ukuba abantu bezwe ngokumelene nabalingani babo abangaqondakali nabangaphezulu. Ngakho ukwakheka komculo nakho kunendima encane.
Zonke izingxenye zinezinga elithile lokuphazamiseka, ngakho-ke kuwukuhlakanipha ukuhlola izinombolo ukuze kugcinwe ukukhanya okukhipha umsindo. Kodwa-ke, iphesenti ye-Total Harmonic Distortion akuyona into ebaluleke kakhulu uma kubheka isithombe esikhulu, ikakhulukazi njengoba amanani amaningi ngokuvamile ephansi kwamaphesenti angu-0.005. Ukungafani okuncane ku-THD kusuka komunye umkhiqizo wenye ingxenye kuya kwesinye kungabalulekile kunamanye okucatshangwayo, njengemithombo yomsindo wekhwalithi, ama-acoustics ekamelweni , nokukhetha izikhulumi ezifanele , ukuqala.