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?????????à???§ (2)
26/11/
26/11/2011

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¤???????§ = ¤?????è
1 Hertz
1 ¤?????????·?

Amplitude

¤?????§ = ¤?????§

à???§??¤?????à????
? MIDI ?????¤?????????·?§?????á??????????§à???§?????????
? é
? WAVE ???·??à???§¨??§á???á??§à???????????¨???à?????¤?????à????
?

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? Mono ????à???§ 1 ???§à???§ à???§à??×??????í?à???à???§
à??????????????à???§?????×???????
? Stereo ????à???§ 2 ???§à???§??é??? ·í????à???§???à?×é??¨??
????í?à??? ·í????à???§??à?????é?
à??????????????à???§à??§ à???§?????

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??¨¨????????????????????????§¤???????§à???§???????????é???
à???§??§ ??§??? á????¤???à·?è?§??§ à??×??¤???à???¨??§???·?è???
à??? Hifi ??×? ?×è? ? ¤??? >>
http://www.buycoms.com/upload/coverstory/115/sound_s
ystem.html

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Input >> Process >> Output

? ? ?

??????§???????à???§ 3 ?§¤???????
1. á???§???à???§ (Input Signal)
??????§ ????·?è·í?????·?è ????????í?à???à???§?????à?×?
è
????à??????à¤?×è?§???? à???§?????á????§???????????
à??? ???¤???? à·????·??à???§ ???? á???×è? ?
2. à¤?×?§????à???§ (Amplifier)
è
??????§ à¤?×è?§?×?·?è·í?????·?è??????????????? ¨??
á???§???à???§???????????á?§??é????? ? à·????? á?????§
???????§?í???§
3. ?í???§ (Speaker) ??????§ à¤?×è?§?×?·?è·í?????·?èà???è??
??????????? ·?è??§??¨??à¤?×è?§????à???§???à???¤?×è?à???§
??è§??????à??¨??????§???

(Input Signal) à???è??à???§à??????????????

(Amplifier) ??????????????????á?§??é? á??§à??? 3 ????
- Pre-Amp ·í?????·?è?????????????à?????á???¤??¤??¤???á?§??§????????é????
?
??¤???á?§??§??????¤§·?è ??èí?à???
- Tone ·í?????·????§á??§??????????? ???à???¤?????à??? à??? ???§á??§à???§·???
è
(Bass) á?????§á??§à???§á??? (Treble)
- Power Amp ·í?????·????????????????·?è???§á??§á????????¤???á?§??§??????
è
à??è???é? á?????§????§?í???§ (Speaker) ·í?????·?èà???????????????????à???¤?×?à???§
è è
à?×è??????????à????????

(Output Signal) à???è?????????????à???à???§

???¤????á???????????¤????
???¤???? à???à¤?×?§?×?·?è·í?????·?èà???è??¤?×è?à???§???à???
è
??????????? ??è§???§¤???????·?è?í?¤?? ¤×? á???????á??? ¨?
??è???à·×??á??·í????à??????§§?????????é? à??????§§???????????
???á?????·?è??á?§¤?×è???????èí???? ??§??é?¨?§???§??§à???????§à¤?×è?§
????à???§ à?×è??????????????á?§à??è???????·????è§
é

???¤????á??§??? 3 ??????
- ?¤?§????§
- ·??·?§??????à???§
- ??????§??

1. á??§????¤?§????§ 6 ????
1) á??¤?????? (Cabon mic) ·í?¨???§???? ¤????????¤?????
??????????à¤?×?§????·????·?
è

2) á??¤?????? (Crystal mic) ???á??¤??????à????????è???à·×?? ·í????
à??????§§??????? ???¤??????????é???·??????????§????????á??
¤????×é? ??¤????

3) á??à?????¤ (Ceramic mic) ¤????á??¤??????
á????¤???·?·????§???? ???????????é§???à¤?×è?§????????

1. á??§????¤?§????§ 6 ????
4) á??¤??à??à???? (Condenser mic) ??? ¤??à??à???? à??????
????§¤?????è à?×?·í????à???????????é? á?????§?????á??à????è
è
à???????????????·í?§?? ¤?????à???§?? à??à??????·?????

5) á????????¤ (Dynamic mic) ???á??à???????? á?????????
(moving coil) à¤?×è?? ?????????????á??à???? ·í????à??????
à???è???í? á??à??????á????????????§¨? ¤???????§à???§?? ??
¤???¤§·? à????·?è¨????§?????????
??§??·???·?·????-???·??à???§

1. á??§????¤?§????§ 6 ????
6) á???????? (Ribbon mic) ??? á???????à????à?? ??§¤???????
?
?????é? ¨?§???§??????????§á??à?????????í???§??§ à?×è?¤?×?à???§??
è
???·????á????????à???? ¨???è???à·×??á??à??????á????????é?
???¤??????????é¨?????¤?á?§ ??¤?????????? ??¤???????§
á??á??à???§????¨ ????? ¨????à???§??? à????·?è¨??í???????????§
??§??·???·?·????-???·??à???§

2. á??§???·??·?§??????à???§ 4 ????
1) á?????à???§???·??·?§à???? (Uni-Directional mic) ??? à???§???
·??·?§à???? ¤×????? ???? ???????à???§¤??????§á¤? à????·?è¨?
?
?í???????í?????????????? ??????·??à???§ ?§????? ??×?·?·?è???
è
??????????????????¤????

2) á?????à???§??? 2 ·??·?§ (Bi-directional mic) ???à???§??? 2
·??·?§·?è??????§???§???

2. á??§???·??·?§??????à???§ 4 ????
3) á?????à???§??????·??·?§ (Omni-directional mic) ??? à???§???
???·??·?§ ????? ¤?????????????à???§à·??? ??? à?????í?????
????????á??§??à?·? á??????à???¤×? à???§¨?à??????·??·?§
?
???§????????????????? (Feed back) ??????

4) á?????à???§???à?????????????????¨ (Cardioid mic) ???à???§???
·??·?§à???? á???????????à???§???à??????????§ ¤???????????¨
??×???????ì ?????????????????¨¨????

3. á??§???????????????§?? 6 ????
1) á????é§???? (Desk mic) ???à??????????é§ ??§?????? ??×???é§?×é?
??§?????????????·? ???????????§à¤?×è??????
?

2) á???×??×? (Hand mic) ????í???????????§ ????????

3) á??????¤? (Lavalier mic) ??????à??? ???à???§??????
¤?à?×?-???à?‰?à?×é? ??×?à?¤ ?· ????????????·í????????·?·????
é

3. á??§???????????????§?? 6 ????
4) á????? (Boom mic) ?????????á????? ? ????à??×???????????
?
??????à?×è???????? ??? ??×????á??§?????????
????????????§???????????·?·????
á?????§???·??à???§???á??§

5) á????§ (Bing mic) ?????é§???????????
·?è??????à¤?×è??????

6) á?????????? (Wireless mic) à???à¤?×è?§??§??·??
???? F.M ????à????í???§??§?èí?
??????à¤?×è?§?????·?????? F.M ??§¤?×è?
???????? ?????? 50-200 à???à·????é?

¤?????????§???¤????á????á?????§???????????
? é ? ?

????????§¤?????è à???¤?????????
? ??????§¤?????è???à???? á??à??? ¤?????è???????§
? ???¤????·?è?? ?? ??????????§¤?????è???à???? ??é§á??
100-10000 à???·?? à???????§?????????????§¤?????è
?????????? à???§????é???é?????????????§??
?
? à??? ???á??§????????§??????¤????·?è??????§¤?????è????§
?????? 50-15000 à???·?? ??????à????à?????? ??è§???á??
???¤????á????????¤ á???????? à??????

¤?????????§???¤????á????á?????§???????????
? é ? ?
¤?????????????à???§
? à?×è?§¨??¤?×è?à???§?????????????????¤????
? ???¤????¨?à???è??¤?×è?à???§à?????????????? á????¤???á?§
??·?è¨?????à??????à¤?×è?§????à???§??????¤????·?è??¤???????????
à???§??§ ¨??????????¤?×è?à???§·?è???????§¨?????¤???????
? ???¤????·?è??? ¨???¤???á?§??§??????·?è????????à???à???à??
(dB) ?èí????? 1 ???·? à??? -60 dB ??×? -50 dB ¤?? dB à?????
???¨???¤??????èí?????¤?? dB ·?èà????????? ??è?¤×? -60dB ??
¤??????èí????? -50dB

¤?????????§???¤????á????á?????§???????????
? é ? ?

?????á???? (Impedance)
? ??????§ ¤???????·????§???¤????·?èà?????é???? ????????
??×????á???????
? ???????à???????? (Ohm) ?? 2 ????
1) ????á??????§ (High Impedance) ??¤?? Impedance ????
??????§ 5-10, 50 á?? 100 K Ohm ?×è§¨?à???????????????
???¤??????é ¤×? ????·?è???¤???????????à??????? 25 ??? ¨?·í????
à???à???§???á?????à????í???§???????
2) ?????á?????èí? (Low Impedance) ??¤?? Impedance 200-
600 ????? ?????????¤?????????????? 100 ???

?????????¤????á??????í???§?????
1. ???à¤????×?à??????¤????
2. ??????????¤?????????×???à?????????
3. ???¤???????????×????§???¤????à????? ???·?è? ? ??¨???????§
?????? 1-4 ??é? ??????¤???????à???§?????¤????????§??????
6-12 ??é?
4. ???à?????? ? ???¤????¤???¨??à???§??????????????? à???
?????, à¤?×è?§?????????
5. ¤???????é§???¤???? ??????§¨???í???§ ???¨í?à???¨????§???????????
¤????????? ?í???§??????????????????é§?????????¤????
6. ???¤????????¤????à?????éí???×???§à???
7. ???§¨??à?????????¤????¤??à??????????§??????à???????? à?×è????§???
????????§ á?? ??????·????à·×??

???????????à?§??????·? (3 ?.¤. 54)
? 54)
????????á??? Audacity ¨??¤???×?
- à¤?×è?§?×?á????????§??à?×é?§???
- ???????á??§à???§
- ?????????à???§
- ???á??à???§¨????????????
- ??????·??????à???§

# ??§??·?è 2 à???¤?á?? 10 ??? (choice) (??¤??à???? 3 ?.¤.)

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