Xu ly am thanh - Moi

M THANH TRN MY TNH

m thanh Mt cch n gin: m thanh l hin tng vt l to nn cm gic nghe thy tai. Thc cht, cc rung ng c hc u to nn m thanh - thc ra l sng m, tuy nhin con ngi ch c th nghe c cc m c tn s trong khong 15Hertz n 20.000Hertz. m thanh c c trng bi tn s (frequency) v bin (amplitude). Tn s ca m thanh cng ln th ting cng thanh (treble), tn s cng b th ting cng trm (bass). Tn s thp Nhiu bass

Tn s cao Nhiu treble

Bin ca m thanh cng ln th m lng (volume) cng ln (ting to), bin cng nh th m lng cng b. Ting ln

Ting b Lun cng giao trc tung (trc ngang) ti 1 im cho bit l cng tn s Ngoi hai c trng trn, trong thc t, ngi ta cn quan tm n cht lng ca m thanh (quality). Do c cc m nhiu (noise) nn cng mt tn s v bin c th m thanh nghe c s khc nhau. Ngoi ra, a s cc ngun m trong t nhin u khng pht ra m thun mt tn s m thng l nhiu tn s kt hp. V d: nt la qung 8 th 3 c tn s 40Hertz nhng khi nghe trn n violon s khc, trn piano khc, guitar khc. Thm vo , do mi trng truyn m, c th xy ra cc hin tng khc x (refraction), phn x (reflection) v giao thoa (interference) to ra cc bin dng m thanh (khi n tai ngi nghe) nh ting vang (echo),... Trong x l m thanh trn my tnh, i khi ngi ta c tnh to ra cc bin dng sng m to cc hiu ng m thanh. Cc c tnh c bn ca m thanh trn my tnhL Vn Lut Trng cao ng ngh Du lch Vng Tu X l m thanh - 1

S knh (Chanels): m thanh thng thng c th l Mono (m thanh n) c 1 knh, Stereo (m thanh ni/m thanh lp th) c 2 knh 1 knh tri (Left) v 1 knh phi (Right). m thanh Streo (2 knh) c th i thnh Mono (1 knh) v ngc li nhng cht lng v hiu ng m thanh thay i. a s m thanh trn my tnh v cassette thng thng hin nay u dng Stereo (2 knh). C th c m thanh nhiu knh hn (3.1; 4; 4.1). Tn s ly mu (Sample rate): tn s ly mu cng cao th m thanh cng thc. Tn s mu thng chn l 44100Hz (=44,1KHz). 8000Hz Cht lng tng ng in thoi 11025Hz Radio AM, ph hp vi ting ni. 22050Hz Radio FM, tm c cho nhc. 44100Hz Cht lng tng ng CD (tt). 48000Hz Cht lng tng ng bng cassette dng s (DAT = Digital Audio Tape). 96000Hz Cht lng tng ng DVD. Kch thc mu (Sample size): c th l 8bit, 16bit, 32bit, S bit cng ln th m thanh cng trung thc. Kch thc mu thng chn l 16bit. Tn s bit (Bit rate): c tnh ton t tn s ly mu (sample rate) v kch thc mu (sample size). Bit rate thng dng l 128kbps (128 Kilo-bit per second).

Cc tiu chun m thanh WAV: Dng m thanh l tn hiu tng t c s ha v ghi trc tip (Waveform). y l dng m thanh c bn trn my tnh. c im ca dng m thanh ny: o Kch thc rt ln (khng c nn). Mt on m thanh di 1 pht lu di dng WAV c kch thc khong 10MB (44100Hz, 16bit). Cng on m thanh vi cht lng tng ng lu di dng MP3 v WMA 9 ch khong 1MB. o Cht lng ph thuc vo tn s ly mu (Sample rate) v kch thc mu (Sample size). MP3 (MPEG1 Layer 3): m thanh nn rt thng dng trong hu ht cc thit b m nhc hin nay. o nghe MP3 trn my tnh cn c nhng b gii m (decoder) l nhng phn mm (cng c th l thit b in t nh trong cc my iPod, MP3,). to ra tp tin MP3 cn c b m ha (Coder). Thng thng ngi ta cung cp c Decoder v Coder chung trong mt phn mm v gi l codec. B codec min ph, y nht hin nay l K-Lite codecs. o Kch thc nh. Cng mt on m thanh, cng cht lng nhng dng b m ha khc nhau c th cho kch thc file kt qu (MP3) khc nhau. Kch thc file MP3 ty thuc vo m thanh (n gin hay phc tp). o Khi nn MP3 ta ch c th iu chnh tn s ly mu (Sample rate) v Bit rate chn la gia cht lng m thanh v kch thc file. WMA (Windows Media Audio): dng m thanh nn tng t MP3 nhng hiu qu hn. Hin nay cng kh thng dng nhng cha bng MP3. Ngoi vic s dng WMA trn thit b c nhn (c nh hoc di ng), WMA cn h tr Streaming. Streaming l k thut nhm m bo bn quyn m thanh thng qua mng Internet. Phn chnh ca m thanh nm trn my ch (trn Internet), ch mt phn nh c th download v my ngi dng. Khi mun nghe m thanh bt buc phi kt ni ti my ch (do phn mm pht m thanh player t thc hin). nghe c WMA c th dng Windows Media Player (c sn trong Windows). RAM (Real Media Audio): Tng t nh WMA v mt Streaming. RAM trc y rt ph bin nhng khi c WMA th RAM dn bt thng dng do vic s dng kh khn hn mt cht so vi WMA. nghe c file RAM cn c phn mm Real Media Player.

C th tm hiu thm v m thanh qua cc trang web: http://arts.ucsc.edu/ems/music/tech_background/tech_background.html http://www.mediacollege.com/audio/01/

L Vn Lut Trng cao ng ngh Du lch Vng Tu

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S dng phn mm GoldWave c im chnh ca GoldWave: Nh gn (sau khi ci t tng dung lng ch 6MB). Tnh nng p ng hu nh tt c cc yu cu c bn v chnh sa m thanh. Ci t GoldWave 5.18 Trong th mc GoldWave c 2 tp tin: gwave518 tp tin ci t keygen tp tin to s ng k

Thc hin ci t: Nhp p chut vo tp tin gwave518, mn hnh sau xut hin:

1. Kch chut vo Next

2. Kch chut vo Next

Bc 1: chun b qu trnh ci t (Install) GoldWave

Bc 2: xc nh v tr ci t GoldWave. Ta gi nguyn thng tin c sn bng cch kch chut vo Next.4. Kch chut vo Ok

3. Kch chut vo Finish 5. ng mn hnh ny

Bc 3: To cc ng tt (Shortcut) cho GoldWave ( d s dng). Ta gi nguyn Thng tin mc nh c sn. Kch Next.

Ti mn hnh 4 v 5, GoldWave nhc mt s thng tin ph tr. Ta chp nhn hon ton. Sau bc th nm ta s thy mn hnh chnh ca GoldWave nh sau:L Vn Lut Trng cao ng ngh Du lch Vng Tu X l m thanh - 3

Bc k tip phi to s ng k v ng k (register) phn mm c th s dng lu di: Chy file keygen (bng cch nhp p chut vo n) trong th mc ci t ca GoldWave. Mn hnh sau xut hin: Ghi li hai dy ch s trong 2 User ID v License sau bm Close ng keygen li. Chuyn v mn hnh GoldWave.

Chn Options Register (mc cui cng). Hp thoi Register license xut hin. Nhp hai dy s ghi li bc chy keygen vo tng ng sau kch chut vo Ok.

GoldWave s nhc rng quyn s dng (license) c chp nhn (accepted):

Kch Ok, GoldWave nhc nn lu li bng cch in, ghi li hoc lu thng tin quyn sL Vn Lut Trng cao ng ngh Du lch Vng Tu X l m thanh - 4

dng (License) s dng trong tng lai. Kch Ok. Ti y ta hon thnh vic ci t GoldWave.


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Mn hnh GoldWave Mn hnh chnh ca GoldWave c dng sau:

Kch chut vo y ng mn hnh iu khin.

Ta c th ng mn hnh iu khin (Control) d nhn hn:

Time & Status

VU Meter

C mt vi thit lp nh cn thc hin ngay t u. Chn Options Control properties (hoc kch chut vo nt Sets control properties hoc nhn phm F11. Mn hnh Control properties xut hin mc , Trong khung Green play chn All, Trong khung Yellow play chn Selection, v b du check trong Loop. mc ,

Trong khung Recording options chn Monitor input.


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X l m thanh trn GoldWave Ta c th thc hin nhiu thao tc x l m thanh trong GoldWave nh: 1. iu chnh m lng. 2. Thm hiu ng nh dn (Fade out), ln dn (Fade in), echo (ting vang), m thanh my mc, 3. Ct, ghp, chn cc khong lng (mute). 4. Lc nhiu (noise),... Tuy nhin, do thi gian c hn v cc chc nng cao cp i hi nm rt nhiu kin thc v sng m v cc hiu ng m nn ta ch tm hiu mt s thao tc c bn trong GoldWave. 1. Thao tc trong ca s GoldWave Vng m thanh ang chn Start marker Finish marker

Vng th sng m chn

Timeline Trong khung hin th sng m (sound graph) c 2 ng sng, mu xanh l cy knh tri, mu - knh phi. Nu l m thanh n (1 knh mono) th s thy 1 ng sng mu xanh l cy. C th phng to theo thi gian (xem chi tit phng to theo b ngang) sng m trong khung ny. phng to hoc thu nh li ta ln bnh xe chut hoc dng phm Shift km vi phm mi tn ln hoc mi tn xung. Cng c th phng to theo bin ( ln phng to theo chiu dc) bng cch nhn gi phm Ctrl v ln bnh xe chut hoc nhn gi Ctrl cng vi phm mi tn ln/xung. Khung Timeline cho php xem tng qut ton b file m thanh. c th thao tc vi tng on m thanh bt k trn ton on m thanh trong ca s, GoldWave cung cp 2 im nh du (Marker): im du bt u (Start marker) v im du kt thc (Finish marker). Ta c th dng chut iu chnh hai im ny chn on m thanh bt k no . Khi mi m 1 tp tin m thanh (hay va ghi m), Start marker nm u on m, Finish marker nm cui on m (tc l ang chn ton b on m). C th t Start/Finish marker ti v tr bt k bng cch bm chut phi trn v tr ri chn Set Start (hoc Finish) marker. Vi m thanh stereo (2 knh), c 3 trng thi x l: ch knh tri (mu xanh, pha trn); ch knh phi (mu , pha di); c 2 knh. thay i: kch chut phi trong khung sng m, chnL Vn Lut Trng cao ng ngh Du lch Vng Tu X l m thanh - 7

Channel, ln lt GoldWave s chuyn gia 3 trng thi trn (thc hin Chut phi Channel ln 1 ch cn knh tri; ln 2 ch cn knh phi; ln 3 c c 2 knh).

2.

iu chnh m lng Chn vng m thanh mun iu chnh m lng (hoc Ctrl A chn ht); Kch chut vo nt Change volume. Mn hnh Change volume xut hin. Tng/Gim volume v c th kch vo nt Preview current settings hoc nhn phm F4 nghe th; Sau khi thy t yu cu kch Ok chp nhn thay i. Nu khng mun thay i th kch Cancel; Sau khi chp nhn (kch Ok) vn c th undo phc hi li tnh trng trc . To hiu ng ln dn (Fade in) v nh dn (Fade out). Chn on m thanh mun to hiu ng. on m thanh cng ngn th tng/gim cng nhanh (t ngt); Kch nt Fade in/out trn thanh cng c. Th

3.

4.

Chn 1 khong lng (mute) t Start marker ti ni mun chn; Edit Insert silence, ca s Insert silence xut hin. Xc nh di khong lng theo giy, pht. V d: 30.00000 l 30 giy; 1:15 l 1 pht 15 giy; 5.0 l 5 giy; 0.5 l na giy.

5.

Chnh m lng ti a Chn on m thanh mun chnh m lng ti a (ln nht c th - nu ln hn s b nhe ting); Chn Maximize volume. Chn Ok.

6.

Xa mt on m thanh Chn on m thanh mun xa; Chn Trim ( chn. ) ct m thanh ngoi vng chn; chn Del ( ) xa m thanh trong vng

7.

Sao chp mt on m thanh Chn on m thanh mun chp; Edit Copy; t Start marker ti v tr mun chp on m thanh ti;L Vn Lut Trng cao ng ngh Du lch Vng Tu X l m thanh - 8

Chn Paste nu mun chn on m vo v tr Start marker hoc Chn Paste mix nu mun trn on m c sn ti v tr Start marker vi on m sao chp hoc Chn Paste replace nu mun thay on m thanh c ang chn bng on m thanh sao chp. 8. To on m thanh lp li Chn on m thanh cn lp li; Edit Copy; Edit Paste (lp thm 1 ln cng vi ln gc l tng cng 2 ln). Nu mun lp thm th tip tc chn Edit Paste. Mi ln nh vy s thm 1 ln lp.


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9.

t cc im dng (cue point) v tch tp tin m thanh Trong mt s trng hp ta cn tch mt tp tin m thanh thnh nhiu tp tin (m thanh) nh hn (l tng on trong tp tin m thanh ban u). V d: khi thu t bng cassette ta c 1 tp tin m thanh l c 1 mt bng (45 pht) trong c th c nhiu bi. Sau khi chnh sa ta mun ghi ln CD theo dng mi bi l 1 track, khi ta phi tch tp tin m thanh ban u thnh nhiu tp tin (mi tp tin l 1 bi). tch 1 tp tin thnh nhiu tp tin, trc ht ta t cc im dng (cue point) ti cc v tr mun tch:a mi tn chut vo im mun to Cue ri kch chut phi

ng Cue (mu en)

Lu : Nn t tn ca Cue point sao cho c th dng lm tn tp tin m thanh sau khi tch file theo Cue points. tch file: Chn Edit Cue points Split files, mn hnh Split file xut hin. Chn Method of naming split files, thng l Use cue name for filename tc l dng tn Cue ( t khi to Cue point) lm tn tp tin mi Cng c th dng Use base filename and number tc t tn cho cc tp tin mi l tn tp tin m thanh gc v theo sau l s th t. Chn File Format, thng l Use files current format and attributes tc dng nh dng ca tp tin hin ti (tp tin gc). Nn chn dng ny v nu tp tin gc l dng MP3 hay WMA th kch thc s nh. Cng c th dng Use CD compatible wave format and alignment - tc dng nh dng chun cho CD (WAV 44KHz, 16 bit). Kch thc s rt ln. 10. Lc nhiu (ting n noise) C nhiu dng nhiu m khc nhau nhng c chia lm 2 loi: nhiu u (nh ting x x lin tc) v nhiu t bin (nh ting do nhn stop hay pause khi thu bng). b nhiu u: chn mt vng ch c nhiu u Edit Copy chn Noise reduction Chn Use clipboard Ok. Nhiu t bin Nhiu u


X l m thanh - 10

11. Ghp m thanh t nhiu tp tin (file) m thanh khc nhau


X l m thanh - 11

Ghi m t ngun m thanh trc tip trn myBn c th dng phn mm nghe nhc no m mt on m thanh v dng GoldWave ghi m li. Cng c th m mt phn mm c m thanh (nh hc ting anh chng hn) hay m CD ting (Audio CD), CD hnh (VCD) hay DVD v dng GoldWave ghi m phn m thanh. Cch thc hin: 1. Chn ngun m l ngun trong my Kch chut vo nt Set control properties (hoc bm phm F11). Mn hnh Control properties xut hin. Chn mc Select trn dng Stereo mix. Chn la ny ch cho GoldWave bit ngun m thanh vo cho n l b trn m stereo (Stereo mix) tc l b trn m ni (stereo). Stereo mix l b phn to m thanh stereo cho my tnh. Hu ht cc phn mm c chc nng pht li m thanh trn my tnh u s dng stereo mix. Ch mt s rt t (xin nhn mnh l rt t) phn mm s dng mono mix (m thanh n mono). D tp tin m thanh l mono nhng khi pht li (play) cc phn mm vn dng stereo mix. Tuy vy, cc phn mm cng ng thi pht m thanh qua c mono mix (nhng m l thanh n, nghe khng hay) tc l ta vn c th chn mono mix ghi m nhng m thanh khng hay. Trong phn m lng (mc nh GoldWave sn l 7) c th iu chnh ty theo ngun m thanh ln hay b. gi tr ln qu th m thanh s b ct trn (m thanh ln s nhe ting nghe khng r), gi tr qu b m ngun m thanh c ch qu b th mt ting. Mc d trong qu trnh 1 trong nhng x l ta c th dng GoldWave tng m lng vng b ct trn nhng nu ngay t lc thu mt di (m qu b) hoc mt trn (m qu ln) th GoldWave khng th can thip c na. Hnh bn cho thy sng m b ct trn do m thanh vo qu ln. Sau khi kch chut vo Ok, chuyn sang phn mm pht v cho pht m thanh. Quay li mn hnh GoldWave theo di trn khung VU Meter s thy mc m lng (volume) ca c 2 knh tri (L = Left), phi (R = Right) thay i theo m thanh. Nu c m thanh m mc m lng trn VU Meter khng thay i th c th do chn nhm trong mc trn hoc c th my tnh c thit lp sai trong phn Sound and Audio devices trong Control panel ca Windows (trng hp ny c th do nhiu l do khc nhau, cn c k thut kim tra). Mc m lng knh tri . Trong mc ny nh du chn vo cnh t

Mc m lng knh phi


X l m thanh - 12


X l m thanh - 13

2. To mt tp tin m thanh mi Kch New trn thanh cng c hoc chn File New trn menu. Mn hnh New sound xut hin. Mn hnh ny cho php thit lp thng tin nh dng cho tp tin m thanh. Mc nhin GoldWave to tp tin m thanh mi theo nh dng WAV (ta khng th thay i c, ch khi lu li mi c th thay i nh dng m thanh thnh MP3 hay WMA,). Chn S knh (Number of channels) l 2 (stereo). Sampling rate l 44.100 (44.1KHz). y l 2 gi tr thng dng nht (nh trong phn Cc c tnh c bn ca m thanh trnh by). Mc Initial file length (HH:MM:SS.T) cho php xc nh di (tnh theo thi gian gi:pht:giy.tc 10 tc = 1 giy) ca tp tin m thanh chun b tao ra. Ta cn d kin thi lng ca on m thanh chun b ghi m xc nh mc ny cho thi lng (c th d nhng khng th thiu).a CD ting (Audio CD) c chiu di m thanh tng cng khong 80 pht/1 a (maximum). a CD hnh (VCD) c chiu di m thanh tng cng khong 60 pht/1 a (max). a DVD chun (1 phim) c chiu di m thanh tng cng khong 120 pht/1 a (max). Cc bi ht thng thng c chiu di t 3 n 6 pht. Nhc c in c th t 1 pht n vi gi.

Lu : khong trng trn a cn kh ln. GoldWave ghi m di dng WAV nn kch thc ln (nu thu c 1 cun bng Cassette 90 pht th c th chim 900MB hoc hn nu cn thu c 1 cun bng th nn thu mi mt lm mt file hoc c th chia nh hn). 3. Thc hin ghi m Trong GoldWave, kch chut vo nt Starts recording pht m cho phn mm bt u pht. sau chuyn nhanh sang phn mm

Quay li GoldWave theo di vic ghi m. Khi ang ghi m mn hnh GoldWave c dng nh sau:


X l m thanh - 14

Sng m knh tri ang thu Sng m knh phi ang thu

Tng thi lng thu c

Sau khi thu phn m thanh cn thit, kch nt Stop recording

dng.


X l m thanh - 15

4. Lu Kch chut vo nt Save trn thanh cng c hoc chn File Save. Mn hnh Save sound as xut hin. Chn th mc mun lu. Nhp tn file. Chn Save as type l Windows Media Audio. Trong Attributes chn l WMA 9, 128kbps, 44kHz, stereo CBR. Sau kch chut Save lu. Chn dng file l WMA 9 v y l dng kh ph bin hin nay (ch sau MP3) v c hiu qu nht (kch thc file nh, cht lng tt tt hn MP3). y l dng mc nh h tr bi Windows (k c Windows Mobile cho cc my Pocket PC). S 9 trong WMA 9 ch phin bn. Phin bn 9 l phin bn c h tr t Windows XP v Windows Mobile 2003 tr v sau ny. Mt s loi my nghe nhc MP3, u a v mt s i iPod loi c khng h tr WMA (rt t). Nu m thanh ghi m ch l ting ni (nh cc bng ting Anh) th c th lu theo dng WMA 9 nhng bit rate v sampling rate nh hn (v d chn Attributes l WMA 9 voice, 20kbps, 22kHz, mono) s gip kch thc file nh hn rt nhiu (ch khong 1/3 so vi 128kbps, 44kHz, stereo) nhng cht lng tng ng. Tuy nhin nu trong m thanh c nhc (d l t) cng nn dng 128kbps, 44kHz, stereo. 1 on m thanh 1 pht lu t GoldWave c kch thc nh sau:WAV 16bit, stereo WMA 9 128kbps, 44kHz stereo CBR WMA 9 voice, 20kbps, 22kHz 10.336KB 966KB 162KB 10MB 0,94MB 0,16MB

Vi cch ghi m ny ta c th ghi m bt k m thanh no do cc phn mm pht trn my tnh (khng ghi m c ngun m thanh t micro v thit b ngoi ghi m t ngun ngoi s tm hiu trong phn sau). Ghi m t cc trang Web Mt trong nhng ngun m thanh hu ch l t cc trang web. C nhiu trang web ch cho php nghe m thanh trc tip trn trang web m khng download v c. Trong trng hp ny ta thc hin vic ghi m tng t nh trn: M trang web c m thanh Thc hin cho pht m thanh mt ln (cho pht ht ton b on m thanh. Trnh duyt web s download m thanh v b m trong my. Lm vic ny khi thc hin ghi m s nhanh hn v khng c nhng khong lng mute trong tp tin m thanh ghi m c) Trong GoldWave, chn ngun m l Stereo mix to tp tin m thanh mi kch nt record chuyn sang trang web v cho pht m thanh.


X l m thanh - 16

Kt ni m thanh gia my tnh v cc thit b khcCc loi u ni C hai loi u ni c bn: c (Male jack plug) v Ci (Female jack socket). Trn cc thit b thng l u ci. Cc u ca cc dy ni thng l u c. Cc u i (adaptor) th 1 u c, 1 u ci. Hnh 1. Jack 3ly (3,5mm) mono c (male)2 cc 3 cc

Hnh 2. Jack 3ly (3,5mm) stereo c (male)

1 ng ngn

2 ng ngn

Hnh 3. Jack RCA (bng sen) ci (Female) 2 knhKnh Phi (mu ) Knh Tri (mu trng/en)

Hnh 4. Jack RCA (bng sen) c (Male)

Hnh 5. Jack 2 ly (2,5mm) stereo c (male)

Hnh 6. u i 3 ly 2 ly u ci 3 ly, u c 2 ly

Hnh 7. u i 2 u RCA (bng sen) 3 ly stereo 2 u ci bng sen, u c 3 ly

(tng t cng c u i 2 u bng sen ra 1 u 2 ly stereo)


X l m thanh - 17

u ni m thanh trn my tnh my tnh c kh nng x l m thanh cn c mch m thanh (Sound card). a s cc my tnh hin nay u c sn mch m thanh. Nhn vo sau lng thng my ta s thy dng sau: Cng bn phm P/S2 Cng Con chut P/S2

Cng Mng RJ45

Cc cng USB

Ng ra (Line out) Ng vo (Line in)

Ng vo Micro (Micro in)

Cc mch m thanh thng c cc ng vo, ra nh sau: Ng ra (Speaker out/Line out) thng c mu xanh l cy nht: y l mt l cm loi Stereo mini jack hay quen gi l ste 3 ly (3 ly = 3mm chnh xc l 3,175mm nhng quen gi l 3 ly) a ra head-phone hoc m-li (Amplifier). Bn c th mua mt si dy stereo c mt u l jack ste 3 ly, u cn li l 2 u mono bng sen (cn gi l Composite hay RCA jack) a m thanh t my tnh ra cc thit b khc c ng vo bng sen (nh mt s cassette, cc ampli,). Cng c th dng dy c hai u l jack ste 3 ly a ra thit b khc (loi c ng vo jack 3 ly nh mt s loi cassette,)

Jack Stereo 3 ly

Jack bng sen (mono) (Composite/RCA jack)

Cp ch Y: 1 u l jack stereo 3 ly, u cn li l 2 jack mono bng sen

Ng vo ting t thit b khc (Line in) thng c mu xanh bin nht: l cm cho jack 3 ly dng ly tn hiu m thanh t cc thit b c ng ra chun (line out) khc. Ng vo cho Micro (Micro in) thng c mu hng nht: L cm cho jack 3 ly s dng micro.

Lu : c nhng loi my c th c nhiu l cm hn (nh hnh di y). y l mch m thanh (Sound card) cho ra m thanh 5.1 (6 knh). Tuy nhin 3 l cm c bn vn nh trn.


X l m thanh - 18

Ty theo thit b cn kt ni vi my tnh m ta phi c cp ni ph hp. nu mun c th kt ni vi hu ht cc loi thit b ta cn: 1. Mt u i t 2 u bng sen thnh 1 u 3 ly stereo (hnh 7 trang trc) khong 5.000. 2. Mt u i t jack 3 ly stereo thnh jack 2 ly stereo (hnh 6 trang trc) khong 4.000. 3. Mt si cp ch Y: 1 u l jack 3 ly stereo, u kia l 2 jack bng sen (RCA) khong 25.000.

Pha jack 3 ly stereo s cm vo ng Line in ca my tnh (nu ly m thanh t thit b ngoi vo my tnh) hoc Line out/Speakers ca my tnh (nu a m thanh t my tnh ra thit b khc). Pha 2 u bng sen c th cm trc tip vo ng ra m thanh ca u CD, DVD, u my hoc dng u i t 2 u bng sen thnh 1 u 3 ly stereo cm vo ng Line in ca my Cassette (nu a m thanh t my tnh vo Cassette) hoc cm vo ng ra Headphone ca my Cassette (nu ly m thanh t thit b ngoi vo my tnh).

Cng c th ch dng 1 si cp 2 u u l jack 3 ly stereo nu ch cn kt ni t my tnh ti cassette c ng vo l jack 3 ly ci (ng ra c hu ht cassette l ng headphone u dng 3 ly ci). Nguyn tc kt ni chung a m thanh t thit b vo my tnhNg ra ca thit b Dy cp Ng vo ca my tnh

Ng ra ca thit b thng dng ng ra headphone (thng l jack 3 ly stereo ci, mt s thit b nh mt s loi Pocket PC, mt s loi in thoi dng ng ra l jack 2 ly stereo ci). a m thanh t my tnh ra thit bNg vo ca thit b Dy cp Ng ra ca my tnh

C mt s loi thit b khng c ng vo nn khng th kt ni vi my tnh. Ng vo thit b thng l jack 3 ly stereo ci, mt s thit b c ng vo l 2 jack bng sen ci.


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a m thanh t my Cassette, MP3, iPod, Pocket PC vo my tnhDng u ra trn thit b l ch cm headphone. N thng l 1 Jack stereo 3 ly (ci). Vi loi ny cn dng cp 2 u stereo 3 ly hoc cp ch Y v u i 2 u bng sen ra 1 u 3 ly stereo. Mt s loi Pocket PC, in thoi dng l cm headphone l l 2 ly stereo, nu vy ta cn thm 1 u i t 3 ly stereo sang 2 ly stereo. 1 u cp (3 ly stereo) cm vo l Headphone trn thit b, u cn li (cng l 3 ly stereo) cm vo l Line in sau my tnh.Cp 2 u 3 ly

a m thanh t u my, u CD, DVD vo my tnhPha sau u my, u CD thng c 3 ng ra (Out) loi RCA (bng sen): mu vng l tn hiu hnh (Video), mu v trng l 2 knh ting ( l knh phi R, trng l knh tri L).

Ty theo loi thit b m s lng u ra m thanh c th khc nhau. Loi thng thng l ra m thanh Stereo chun (2 knh). Hin nay a s u DVD u cho ra m thanh 7.1 (8 ng ra m thanh): Ch dng 2 ng FL v FR

FL = Front Left; FR = Front Right; CEN = Center; SW = Subwoofer (siu trm nh Super bass hay LFE = Low-frequency effects); SL = Surround Left (loa to hiu ng m thanh vng bn tri); SR = Surround Right; ML = Mixed Left (loa to hiu ng m thanh vng pha sau cn gi l LB = Left Back). Ta ch dng 2 knh FL (Front Left) v FR (Front Right). Trong c 2 trng hp ny ta dng cp ch Y: 1 u l 2 jack bng sen, u kia l 1 jack 3 ly stereo. Dng 2 u bng sen trn cp ch Y ni vo 2 ng ra L v R (theo ng mu: trng ). u cn li ca cp ch Y (u stereo 3 ly) cm vo ng Line in ca my tnh.L Vn Lut Trng cao ng ngh Du lch Vng Tu X l m thanh - 20

Lu : do a tn hiu t ngoi vo my tnh nn ta vn ng Line in ca my tnh ra loa c th kim sot m thanh vo.


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Lu : Trong GoldWave, ghi m t ngun ngoi (nh t Cassette,) ta thc hin nh ghi m t ngun trong my nhng bc u tin (chn ngun m thanh) ta chn ngun l Line in (ly m thanh t ng vo Line in) thay v Stereo mix nh khi ghi m t ngun trc tip trong my. Nu dng micro gn vo my tnh v mun ghi m t ngun micro th chn ngun l Microphone. (cc ngun cn li: Mono mix, Aux, CD Player, Phone Line hu nh khng bao gi s dng tr mt vi trng hp rt c bit nh dng my tnh kt ni vi MODEM ri gi in thoi trc tip trn my tnh v mun ghi m cuc thoi khi s dng Phone Line,).

a m thanh t my tnh ra my CassetteNg Line in trn my cassette thng nm sau lng my. n c th l jack 3 ly stereo hoc 2 jack bng sen. Nu ng Line in trn my Cassette l jack 3 ly stereo th dng cp 2 u l jack 3 ly stereo. Nu ng Line in trn my Cassette l 2 jack bng sen th dng cp 2 u l jack 3 ly stereo. Mt u (3 ly stereo) cm vo l Line out trn my tnh, u kia (3 ly stereo hoc 2 bng sen) cm vo ng Line in ca Cassette.

Lu : Sau khi kt ni dy, cn chn ngun m thanh trn my Cassette l Line in (mt s my l Line). Lc ny my cassette s dng nh m ly v loa. Ta hon ton c th ghi vo bng bng cch dng chc nng record bnh thng (ngun vo vn phi v tr Line in ).


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