He aha ka nui o ka'āpana'āpana (THD)?

E nānā iāʻoe ma ka papa kuhikuhi a ka mea hanahana - a iʻole paha i ka hōʻailona o ke kelepona - a heluhelu pahaʻoe i kahi'ōlelo i kapaʻiaʻo Total Harmonic Distortion (e hoʻolālāʻia me THD). Hiki iāʻoe keʻike i kēia i heluʻia ma nā mea'ōlelo, nā pepeiao pepeiao, nā mea heluhelu media / MP3, nā mea hou, nā hoʻolaha, nā pane , a me nā mea'ē aʻe. ʻO ke kumu, inā pili kēia i ke kope o ke kani a me ke mele, e hele ana (inā) e loaʻa kēia kikowaena i loaʻa. Ka nui o ka Harmonic Distortion i ka noʻonoʻoʻana i nā lakohana, akā i kekahi wahi wale nō.

He aha ka hopena o ka hoʻohālike?

ʻO ke kikowaena no ka Total Harmonic Distortion kekahi mea e hoʻohālikelike i nā hōʻailona leo a me nā puka kani, me ke koena ma nā pae ana i anaʻia he hapa. No laila hiki iāʻoe keʻike i kahi THD i heluʻia he 0.02 ōkene me nā kūlana kūikawā o ka pinepine a me ke ana pele i loko o ke kuahene ma hope o ia (eg 1 kHz 1 Vrms). Loaʻa heʻano nui o ka mīkini i ka heluʻana i ka Haʻuna Harmonic Distortion, akā pono e hoʻomaopopoʻia nā mea a pau,ʻo ia ka helu o ka hoʻohālike o ka hua'ōlelo -ʻo ka haʻahaʻa haʻahaʻaʻoi aʻe. E hoʻomanaʻo,ʻo ka hōʻailona huapalapala he kope ia aʻaʻole loa he kope piha o ka hoʻokomo,ʻoiai ma kahi pūnaewele he nui nā mea i komo. Ke hoʻohālikeʻana i nā hōʻailonaʻelua ma ka pakuhi, hiki iāʻoe keʻike i nā liʻiliʻi.

Hoʻokumu 'ia ke mele i nā kumu kūpono a me nā manawa lōkahi . ʻO ka hui pūʻana o nā lālā papahana a me nā papahana e hāʻawi i nā mea kani mele kūikawā a hiki i ka pepeiao o ke kanaka keʻike i waena o lākou. Eia kekahi laʻana, he violin e pāʻani ana i waena o ka helu A me ka heluʻana he 440 Hz i ka hanaʻana i ke alapine (frequency of frequency) i 880 Hz, 1220 Hz, 1760 Hz, a pēlā aku. ʻO kahi cello e pāʻani ana i ka waena waenaʻO kahi leka e like me ka violin ke kani mau nei me he cello no ka mea o kona mau kumu pono'ī a me nā mea likeʻole.

No ke aha he mea nui ka hoʻokaʻawaleʻana i ke kaʻina

I ka manawa iʻoi aku ka nui o ka Harmonic Distortion a ma mua o kekahi wahi, hiki iāʻoe ke manaʻo i ka pololei o ke kani e hoʻololiʻia. Hiki kēia i ka wā e hanaʻia nā alapine likeʻole - nā mea i hōʻikeʻoleʻia ma ka hōʻailona hoʻokomo - a hoʻouluʻia i ka huahana. No laila, he THD o ka 0.1 pakeneka ka mea i manaʻoʻia he 0.1 pakeneka o ka hōʻailona huapalapala a hewa a loaʻa i loko o ka haunaele i makemakeʻoleʻia. ʻO kēiaʻano hoʻololi nui e hiki ai ke alakaʻi i kahiʻike kahi e kani ai nā mea kaniʻole i nā kani aʻaʻole like me ka mea e pono ai.

Akā,ʻo kaʻoiaʻiʻo,ʻaʻoheʻike ikiʻia ka Total Harmonic Distortion i ka nui o nā pepeiao kanaka, no ka meaʻoi aku ka hanaʻana o nā mea hana me nā hua'ōlelo THD o nā hapa liʻiliʻi o ka pakeneka. Inā hikiʻole iāʻoe ke lohe pinepine i ka hoʻohālike hapalua o ka paʻakikī, a lailaʻaʻoleʻoe eʻike i kahi o ka THD o ka hōʻemi 0.001 (kahi hiki ke paʻakikī ke koho ponoʻia). ʻAʻoleʻo ia wale nō, akā,ʻo ka'ōlelo no ka Total Harmonic Distortion, he kumu kūʻai maʻamauʻole ia eʻikeʻole i ka paʻakikīʻana o nā harmonics- a me nā aho haʻahaʻa haʻahaʻa no ka loheʻana o nā kānaka e pili ana i ko lākou mauʻano keu a me kaʻoihana kiʻekiʻe. No laila, hoʻokani ke mele mele i kahiʻano liʻiliʻi.

Hoʻohuiʻia kēlā me kēia'āpana o ka haunaele, no laila he mea maʻalahi ke helu i nā helu i mea e mālama ai i ka'ōnaehana puka puka. Eia naʻe,ʻaʻole ka mea nui o ka māhele o ka Total Harmonic Distortion ma kahiʻikeʻana i ke nānāʻana i ke kiʻi nui, akā, ma muli o ka nui o nā kumu waiwai i emiʻole he 0.005 pakeneka. ʻO ka liʻiliʻi liʻiliʻi o THD mai kekahi wēlau o kekahi mea i kekahi me ka mea'ē aʻe he hikiʻole ke hōʻoleʻia me nā manaʻo'ē aʻe, e like me nā kumu leo ​​maikaʻi, nā'ahamele lumi , a me ke kohoʻana i nā'ōlelo kūpono , e hoʻomaka me.