Music systems: active acoustics

2024 Tus sau: Leah Sherlock | [email protected]. Kawg hloov kho: 2023-12-17 05:37

Mloog cov nkauj uas koj nyiam tshaj plaws, tsis tshua muaj leej twg xav txog cov lej cuam tshuam nrog hertz, decibels, watts, zaus, thiab txawm tias THD. Txawm li cas los xij, qhov tseeb ntawm kev tsim tawm, nrov nrov thiab saturation ntawm lub suab nyob ntawm lawv. Nws tsis yooj yim sua kom hais meej meej tias qhov muaj zog tshaj plaws kuj yog qhov zoo tshaj plaws acoustics.

Human hnov lus thiab xaiv tus hais lus

Suab yog hu ua lub tshuab vibrations ntawm cov ntsiab lus ntawm lub cev ib puag ncig, muaj peev xwm ua rau qee qhov kev xav hauv tib neeg lub hlwb. Kev nthuav tawm ceev ntawm cov nthwv dej no nyob ntawm qhov ntom ntawm cov dej, ntoo, hlau lossis cua uas lawv txav mus. Cov kws tshawb fawb tau ua pov thawj tias tib neeg hnov tsuas yog qee qhov ntawm lub suab nrov: ntawm 20 Hz txog 22 kHz. Cov cheeb tsam qis ntawm qhov ntau yog infrared (tsawg heev), lub sab sauv yog ultrasonic (siab dhau). Raws li nws pom tseeb, hluav taws xob uas muaj nuj nqis ntau dua lossis tsawg dua li cov duab no, peb pob ntseg hnov tsis tau.

suab paj nruag thiab thev naus laus zis tshiab

Basictus naj npawb ntawm cov tshuab tsim suab tau muab faib los ntawm cov kws tshaj lij ua 3 pawg.

Thawj suav nrog cov lus hu ua "point" nrov uas tshaj tawm cov lus hais lossis suab paj nruag hauv ib qho kev coj.

Pab pawg thib ob suav nrog cov tshuab ntawm cov emitters, cov horns uas yog tsom rau kev pabcuam ib cheeb tsam: txoj kev lossis chaw.

qeb thib peb suav nrog kev ua suab paj nruag, nrog lub kaw lus rau kev faib cov suab nrov ntawm ob peb kab:

• tsuas yog ntawm cov phab ntsa sib luag;
• ntawm ib phab ntsa;
• ntawm lub qab nthab thiab raws phab ntsa;

Linear active hi-fi acoustics yog siv ob qho tib si ntawm cov theem qhib, thiab hauv tsev, thiab hauv tsev kaw.

Puas muaj tseeb tias tus hais lus muaj zog dua, lub suab suab nrov dua?

Cov suab paj nruag zoo tshaj plaws yuav ua rau cov tsev neeg tau so thiab pw tsaug zog yooj yim nrog cov nkauj lag ntseg. Txawm li cas los xij, lub zog ntsuas tsis muaj dab tsi ua nrog nws. Qhov no characterizes, theej, cov neeg kho tshuab kev ntseeg siab ntawm lub system: ntau dua tus naj npawb, ntev nws yuav ua hauj lwm. Thiab lub hwj chim ntawm lub amplifier yuav tsum tsawg dua lub hwj chim ntawm cov neeg hais lus, txwv tsis pub lub suab paj nruag yuav nres sai sai, vim hais tias cov hais lus yuav overheat thiab hlawv.

Hauv kev muaj tiag, qhov ntim rov qab tsis cuam tshuam los ntawm kev quab yuam, tab sis los ntawm qhov rhiab heev ntawm cov neeg hais lus, ntsuas hauv decibels. Qhov Performance index ntawm 85 dB yog qhov tsim nyog rau cov khoom siv suab paj nruag ntsia hauv ib chav tsev.

Lwm qhov tseem ceeb yog qhov ntsuas ntsuas zaus. Tsev acoustics (active lossis passive) yuav tsum muaj ob qho tib si woofers thiab tweeters thiab cov neeg hais lus nruab nrab. MuajLub spectrum ntawm cov frequencies nyob rau hauv lub suab paj nruag yuav ua rau nws richer, thiab mloog yuav ua rau kom txaus siab.

Striped systems - dab tsi yog tso dag

Qhov tseeb, acoustics nquag, zoo li passive ones, tsis tau banding, tab sis banding. Yog hais tias tsuas muaj ib tug hais lus nyob rau hauv chav tsev, qhov no yog ib leeg-band los yog wideband suab, ob (ib tug nrog bass thiab nruab nrab, thiab ib tug nrog treble) yog ob txoj kev. Sophisticated suab paj nruag lovers yuav peb-, plaub- thiab txawm tsib-txoj kev suab tshuab rau lawv tus kheej, nyob rau hauv uas txhua tus neeg hais lus yog nruab nrog beepers uas tsim suab ntawm ib tug sib txawv ntau yam. Ib tug feature ntawm multiband systems yog lub xub ntiag ntawm built-in lim uas tsim suab hluav taws xob nkag mus rau tib neeg pob ntseg.

Active hi-fi hais lus feem ntau muaj chav tsev loj, ntses bass thaj tsam subwoofers thiab ntau tus neeg hais lus satellite me me.

Thaum yuav khoom npaj ua tiav, koj yuav tsum ua tib zoo saib xyuas qhov ua tiav ntawm cov khoom siv. Nws yuav tsum muaj cov ntsiab lus xws li:

• subwoofer + loudspeaker;
• paired rear thiab pem hauv ntej hais lus;
• chav tsev nrog lub suab nrov.

Cov suab nrov nrov rau tsev ua yeeb yam yuav tsum tau nruab nrog lub nraub qaum. Qhov no yuav tsim kom muaj kev paub suab zoo.

ntoo lossis yas?

Thaum xaiv lub suab paj nruag, ua tib zoo mloog cov khoom ntawm lub thawv hais lus. Niaj hnub nimno acoustics sab nraum zoov feem ntau muab tso rau hauv bass-reflex thawv. Rau kev tsim khoomLub cev nrov nrov siv ob qho tib si ntoo thiab yas. Nws yog qhov zoo dua yog tias rooj plaub muaj qhov tsis sib xws, tsis muaj qhov cua thiab nrog cov pob qij txha zoo. Lub downside ntawm yas rooj plaub yog rattling nrog ib tug tseem ceeb nce nyob rau hauv ntim, distortion ntawm lub suab. Yog li ntawd, cov tuam txhab lag luam ib txwm ntim cov tshuab hnyav dua li cov neeg hais lus hauv computer hauv cov thawv ntoo txhim khu kev qha.

Yuav ua li cas tso cov ntsiab lus ntawm lub suab nrov hauv chav?

Zoo zoo rau kev mloog nkauj yog chav uas ua tau raws li cov hauv qab no:

• tsis muaj "fluttering" ncha thiab lub suab nrov hauv zos;
• txawm tias faib lub suab nrov thoob plaws hauv chav;
• txo suab nrov cuam tshuam.

Thaum npaj ib chav rau tso cov suab nrov tshaj tawm, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias qhov chaw ntawm cov phab ntsa sab nraud yuav tsum tsis txhob ua kom du thiab sib npaug. Txwv tsis pub, cov suab yuav raug cuam tshuam los ntawm lawv, zoo li cov pob, tsim cov nyhuv ntawm lub suab nrov tsis zoo, uas yuav tig lub suab paj nruag mus rau hauv ib lub suab nrov nrov nrog lub suab nrov. Niches, pilasters, npuag mufflers yog qhov tsim nyog rau kev tsim kom pom kev sib txawv thiab txhim kho diffuseness.

Yog tus tswv nyiam hu nkauj karaoke, xav muab lub microphone tso rau hauv chav. Nws yog ib qho tseem ceeb uas yuav tsum tau muab tso rau hauv ib txoj kev xws li kom tsis txhob muaj tus kheej excitation ntawm lub amplifiers. Tsis tas li ntawd, tsis txhob hu nkauj, koj yuav tsum tau mloog cov lus creaking thiab screeching.

Thaum acoustics muaj active tso rau hauvnpaj txhij, lub suab zoo yog raws li tau tshaj tawm thiab yuav muab rau koj ib tug zoo kev mloog.