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กระบวนการเสียง Input
- 1. ¡Ãкǹ¡ÒÃàÊÕ§ (2) 26/11/ 26/11/2011 ÇÅѾà ǧȡͧᡌÇ
- 2. ¤ÇÒÁ¡ÇŒÒ§ = ¤ÇÒÁ¶Õè 1 Hertz 1 ¤Òºµ‹ÍÇÔ¹Ò·Õ Amplitude ¤ÇÒÁÊÙ§ = ¤ÇÒÁ´Ñ§
- 3. àÊÕ§㹤ÍÁ¾ÔÇàµÍà MIDI ÍÒÈѤÇÒÁÊÒÁÒö·Ò§ÎÒôáÇêÇÂÊÌҧàÊÕ§¢Ö¹ÁÒãËÁ‹ ‹ é WAVE ºÑ¹·Ö¡àÊÕ§¨ÃÔ§áÅŒÇá»Å§à»š¹¢ŒÍÁÙÅ´Ô¨µÍÅà¡çºã¹¤ÍÁ¾ÔÇàµÍÃ Ô ÃкºàÊÕ ÃкºàÊÕ§ Mono ¢ÂÒÂàÊÕ§ 1 ª‹Í§àÊÕ§ àÊÕ§àËÁ×͹µŒ¹¡íÒà¹Ô´àÊÕ§ àËÁÒСѺ¡ÒâÂÒÂàÊÕ§¾Ù´ËÃ×ͺÃÃÂÒ Stereo ¢ÂÒÂàÊÕ§ 2 ª‹Í§àÊÕ§¢Öé¹ä» ·íÒãËŒàÊÕ§¼Ô´à¾×鹨ҡ µŒ¹¡íÒà¹Ô´ ·íÒãËŒàÊÕ§ä¾àÃÒТÖé¹ àËÁÒСѺ¡ÒâÂÒÂàÊÕ§à¾Å§ àÊÕ§´¹µÃÕ
- 4. ÃкºàÊÕ ÃкºàÊÕ§㹻˜¨¨Øº¹ Ñ »˜¨¨ØºÑ¹ä´ŒÁÕ¡ÒþѲ¹Ò»ÃѺ»Ãا¤Ø³ÀÒ¾¢Í§àÊÕ§ãËŒÍÂÙ‹ã¹¢Ñé¹´Õ àÊÕ§´Ñ§ ¿˜§ªÑ´ áÅÐÁÕ¤ÇÒÁà·Õ觵ç àËÁ×͹¤ÇÒÁ໚¹¨ÃÔ§ÁÒ¡·ÕèÊØ´ ઋ¹ Hifi ËÃ×Í Í×è¹ æ ¤ÅÔ¡ >> http://www.buycoms.com/upload/coverstory/115/sound_s ystem.html
- 5. Ãкº¢Í§¡ÒâÂÒÂàÊÕ§ Input >> Process >> Output ? ? ?
- 6. Ãкº¢Í§¡ÒâÂÒÂàÊÕ§ 3 ͧ¤»ÃСͺ 1. áËÅ‹§µŒ¹àÊÕ§ (Input Signal) ËÁÒ¶֧ ʋǹ·Õè·íÒ˹ŒÒ·Õè ¼ÅÔµµŒ¹¡íÒà¹Ô´àÊÕ§ÍÍ¡ÁÒà¾×Í è »‡Í¹à¢ŒÒÊÙ‹à¤Ã×èͧ¢ÂÒ àÊÕ§ã¹ÃٻẺ¢Í§ÊÑҳ俿‡Ò ઋ¹ äÁâ¤Ã⿹ à·»ºÑ¹·Ö¡àÊÕ§ «Õ´Õ áÅÐÍ×è¹ æ 2. à¤Ã×ͧ¢ÂÒÂàÊÕ§ (Amplifier) è ËÁÒ¶֧ à¤Ã×èͧÁ×Í·Õè·íÒ˹ŒÒ·Õè¢ÂÒÂÊÑҳ俿‡Ò ¨Ò¡ áËÅ‹§µŒ¹àÊÕ§ãËŒÁÕÊÑÒ³áç¢Öé¹ËÅÒ æ à·‹ÒµÑÇ áÅŒÇÊ‹§ µ‹Íä»ÂѧÅíÒ⾧ 3. ÅíÒ⾧ (Speaker) ËÁÒ¶֧ à¤Ã×èͧÁ×Í·Õè·íÒ˹ŒÒ·Õèà»ÅÕè¹ ÊÑҳ俿‡Ò ·ÕèÊ‹§ÁÒ¨Ò¡à¤Ã×èͧ¢ÂÒÂàÊÕ§ãˌ໚¹¤Å×è¹àÊÕ§ «Öè§Á¹ØÉÂàÃÒ¨ÐÃѺ¿˜§ä´Œ
- 7. Input >> Process >> Output
- 8. (Input Signal) à»ÅÕè¹àÊÕ§໚¹ÊÑҳ俿‡Ò (Amplifier) ¢ÂÒÂÊÑҳ俿‡ÒãËŒáç¢Öé¹ áº‹§à»š¹ 3 ʋǹ - Pre-Amp ·íÒ˹ŒÒ·ÕèúÊÑҳ俿‡ÒࢌÒÁÒáŌǤǺ¤ØÁ¤ÇÒÁáç¢Í§ÊÑÒ³¹Ñé¹ãËŒ Ñ ÁÕ¤ÇÒÁáç¢Í§ÊÑÒ³¤§·Õè ÊÁèíÒàÊÁÍ - Tone ·íÒ˹ŒÒ·Õ»Ãاᵋ§ÊÑҳ俿‡Ò ãËŒà¡Ô´¤ÇÒÁä¾àÃÒРઋ¹ »Ãاᵋ§àÊÕ§·ØŒÁ è (Bass) áÅлÃاᵋ§àÊÕ§áËÅÁ (Treble) - Power Amp ·íÒ˹ŒÒ·Õ¢ÂÒÂÊÑҳ俿‡Ò·Õè»Ãاᵋ§áÅŒÇãËŒÁÕ¤ÇÒÁáç¢Í§ÊÑÒ³ è à¾ÔèÁ¢Öé¹ áÅŒÇÊ‹§ä»ÂѧÅíÒ⾧ (Speaker) ·íÒ˹ŒÒ·Õèà»ÅÕ¹ÊÑҳ俿‡Òãˌ໚¹¤Å×¹àÊÕ§ è è à¾×èÍãËŒÁ¹ØÉÂàÃÒä´ŒÂÔ¹ (Output Signal) à»ÅÕè¹ÊÑҳ俿‡Ò໚¹àÊÕ§
- 9. Input ÏÅÏ
- 10. äÁâ¤Ã⿹áÅСÒÃ㪌äÁâ¤Ã⿹ äÁâ¤Ã⿹ ໚¹à¤Ã×ͧÁ×Í·Õè·íÒ˹ŒÒ·Õèà»ÅÕ蹤Å×è¹àÊÕ§ãˌ໚¹ è ÊÑҳ俿‡Ò «Öè§ÁÕͧ¤»ÃСͺ·ÕèÊíÒ¤Ñ ¤×Í á¼‹¹ä´ÍÐá¿ÃÁ ¨Ð ÊÑè¹ÊÐà·×͹áÅзíÒãËŒà¡Ô´¾Åѧ§Ò¹ä¿¿‡Ò¢Öé¹ à»š¹¾Åѧ§Ò¹ä¿¿‡Òª¹Ô´ ¡ÃÐáÊÊÅѺ·ÕèÁÕáç¤Å×è¹ä¿¿‡ÒµèíÒÁÒ¡ ´Ñ§¹Ñ鹨֧µŒÍ§Ê‹§à¢ŒÒä»Âѧà¤Ã×èͧ ¢ÂÒÂàÊÕ§ à¾×èÍ¢ÂÒÂÊÑÒ³ãËŒáçà¾ÔèÁ¢Ö¹ÍÕ¡·Õ˹Öè§ é
- 11. äÁâ¤Ã⿹ẋ§ä´Œ 3 ÅѡɳР- â¤Ã§ÊÌҧ - ·ÔÈ·Ò§¡ÒÃÃѺàÊÕ§ - ¡ÒÃ㪌§Ò¹
- 12. 1. ẋ§µÒÁâ¤Ã§ÊÌҧ 6 ª¹Ô´ 1) Ẻ¤Òú͹ (Cabon mic) ·íÒ¨Ò¡¼§¶‹Ò¹ ¤Ø³ÀÒ¾äÁ‹¤‹ÍÂ´Õ ¹ÔÂÁ㪌¡Ñºà¤Ã×ͧÃѺâ·ÃÈѾ· è 2) Ẻ¤ÃÔʵÑÅ (Crystal mic) 㪌áˤÃÔʵÑÅ໚¹µÑÇÊÑè¹ÊÐà·×͹ ·íÒãËŒ à¡Ô´¾Åѧ§Ò¹ä¿¿‡Ò äÁâ¤Ã⿹ª¹Ô´¹ÕéäÁ‹·¹µ‹ÍÊÀÒ¾¢Í§ÍسËÀÙÁÔáÅÐ ¤ÇÒÁª×é¹ ÃÒ¤Ò¶Ù¡ 3) Ẻà«ÃÒÁÔ¤ (Ceramic mic) ¤ÅŒÒÂẺ¤ÃÔʵÑŠᵋÁÕ¤ÇÒÁ·¹·Ò¹ÊÙ§¡Ç‹Ò ¹ÔÂ㪌µÔ´µÑ駡Ѻà¤Ã×èͧÂÒ¹¾Ò˹Ð
- 13. 1. ẋ§µÒÁâ¤Ã§ÊÌҧ 6 ª¹Ô´ 4) Ẻ¤Í¹à´¹à«Íà (Condenser mic) 㪌 ¤Í¹à´¹à«Íà ໚¹µÑÇ ÊÌҧ¤ÇÒÁ¶Õè à¾×Í·íÒãËŒà¡Ô´ÊÑÒ³¢Öé¹ áµ‹µŒÍ§ÍÒÈÑÂẵàµÍÃÕè è ໚¹µÑǪ‹ÇÂ㹡Ò÷íÒ§Ò¹ ¤Ø³ÀÒ¾àÊÕ§´Õ àºÒàÅç¡¡ÃзѴÃÑ´ 5) Ẻ䴹ÒÁÔ¤ (Dynamic mic) 㪌áÁ‹àËÅ硶ÒÇà áÅÐÁÕ¢´ÅÇ´ (moving coil) à¤Å×è͹ äËÇä»ÁÒã¹Ê¹ÒÁáÁ‹àËÅç¡ ·íÒãËŒà¡Ô´¡Òà à˹ÕèÂǹíÒ áÅÐà¡Ô´¡ÃÐáÊä¿¿‡ÒäËÅã¹Ç§¨Ã ¤Ø³ÀÒ¾¢Í§àÊÕ§´Õ ÁÕ ¤ÇÒÁ¤§·¹ àËÁÒзÕè¨Ð㪌§Ò¹ÊÒ¸ÒóРʋ§ÇÔ·ÂØâ·Ã·Ñȹ-ºÑ¹·Ö¡àÊÕ§
- 14. 1. ẋ§µÒÁâ¤Ã§ÊÌҧ 6 ª¹Ô´ 6) ẺÃÔººÍ¹ (Ribbon mic) 㪌 Ἃ¹ÍÅÙÁà¹ÕÂÁàºÒ ºÒ§¤ÅŒÒ¡Ѻ Ô ÃÔººÔé¹ ¨Ö§µŒÍ§ÍÂÙ‹ÃÐËÇ‹Ò§áÁ‹àËÅ硶ÒÇáíÒÅѧÊÙ§ àÁ×èͤÅ×¹àÊÕ§ÁÒ è ¡Ãзº¡Ñºá¼‹¹ÍÅÙÁÔà¹ÕÂÁ ¨ÐÊÑè¹ÊÐà·×͹áÅÐà¡Ô´¡ÃÐáÊä¿¿‡Ò¢Öé¹ äÁâ¤Ã⿹ª¹Ô´¹Õé¨ÐÁÕÃÒ¤Òᾧ ÁդسÀÒ¾´ÕÁÒ¡ ÁÕ¤ÇÒÁäÇÊÙ§ áÁŒáµ‹àÊÕ§ËÒÂ㨠ÅÁ¾Ñ´ ¨ÐÃѺàÊÕ§䴌 àËÁÒзÕè¨Ð¹íÒä»ãªŒã¹ËŒÍ§ Ê‹§ÇÔ·ÂØâ·Ã·Ñȹ-ºÑ¹·Ö¡àÊÕ§
- 15. 2. ẋ§µÒÁ·ÔÈ·Ò§¡ÒÃÃѺàÊÕ§ 4 ª¹Ô´ 1) ẺÃѺàÊÕ§䴌·ÔÈ·Ò§à´ÕÂÇ (Uni-Directional mic) ÃѺ àÊÕ§䴌 ·ÔÈ·Ò§à´ÕÂÇ ¤×Í´ŒÒ¹ ˹ŒÒ ÁÕÁÁÃѺàÊÕ§¤‹Í¹¢ŒÒ§á¤º àËÁÒзÕè¨Ð Ø ¹íÒä»ãªŒÊíÒËÃѺ¡ÒúÃÃÂÒ ¡Òúѹ·Ö¡àÊÕ§ ǧ´¹µÃÕ ËÃ×Í·Õ·Õè¼ÙŒ è ¾Ù´ÍÂÙ‹´ŒÒ¹Ë¹ŒÒäÁâ¤Ã⿹ 2) ẺÃѺàÊÕ§䴌 2 ·ÔÈ·Ò§ (Bi-directional mic) ÃѺàÊÕ§䴌 2 ·ÔÈ·Ò§·ÕèÍÂÙ‹µÃ§¢ŒÒ§¡Ñ¹
- 16. 2. ẋ§µÒÁ·ÔÈ·Ò§¡ÒÃÃѺàÊÕ§ 4 ª¹Ô´ 3) ẺÃѺàÊÕ§䴌Ãͺ·ÔÈ·Ò§ (Omni-directional mic) ÃѺ àÊÕ§䴌 Ãͺ·ÔÈ·Ò§ â´ÂÁÕ ¤ÇÒÁäÇ㹡ÒÃÃѺàÊÕ§෋Òæ ¡Ñ¹ àËÁÒÐÊíÒËÃѺ 㪌㹡ÒÃáÊ´§º¹àÇ·Õ áµ‹Á¢ŒÍàÊÕ¤×Í àÊÕ§¨ÐࢌÒÃͺ·ÔÈ·Ò§ Õ »‡Í§¡Ñ¹ÊÑҳŒ͹¡ÅѺ (Feed back) ä´ŒÂÒ¡ 4) ẺÃѺàÊÕ§ºÃÔàdz´ŒÒ¹Ë¹ŒÒÃÙ»ËÑÇ㨠(Cardioid mic) ÃѺàÊÕ§䴌 ·ÔÈ·Ò§à´ÕÂÇ áµ‹ÊÒÁÒöÃѺàÊÕ§䴌໚¹ÁØÁ¡ÇŒÒ§ ¤ÅŒÒÂÃÙ»ËÑÇ㨠ËÃ×Íãºâ¾¸Ôì ¹ÔÂÁ㪌¡Ñ¹ÁÒ¡ã¹»˜¨¨ØºÑ¹
- 17. 3. ẋ§µÒÁÅѡɳСÒÃ㪌§Ò¹ 6 ª¹Ô´ 1) ẺµÑé§âµÐ (Desk mic) 㪌àÊÕºº¹¢ÒµÑé§ ÇÒ§º¹âµÐ ËÃ×͵Ñ駾×é¹ µÃ§Ë¹ŒÒ¼ÙŒ¾Ù´â´Â·Õ ¼ÙŒ¾´äÁ‹µŒÍ§à¤Å×è͹ä»ÁÒ Ù 2) ẺÁ×Ͷ×Í (Hand mic) 㪌ÊíÒËÃѺ¹Ñ¡ÃŒÍ§ ¹Ñ¡â¦É³Ò 3) ẺˌÍÂ¤Í (Lavalier mic) ÁÕ¢¹Ò´àÅç¡ ãªŒàÊÕ§µÔ´¡Ñº ¤ÍàÊ×Í-¡ÃÐ້ÒàÊ×éÍ ËÃ×Í๤ ä· ¹ÔÂÁ㪌㹡Ò÷íÒÃÒ¡ÒÃâ·Ã·Ñȹ é
- 18. 3. ẋ§µÒÁÅѡɳСÒÃ㪌§Ò¹ 6 ª¹Ô´ 4) ẺºÙÁ (Boom mic) µÔ´ÍÂÙ‹º¹á¢¹ÂÒÇ æ ÍÂÙ‹à˹×ÍÈÕÃÉмٌ¾´ Ù ÊÒÁÒöàÊ×è͹µÒÁ¼ÙŒ ¾Ù´ ËÃ×ͼٌáÊ´§ä»ä´ŒµÅÍ´ ¹ÔÂÁ㪌ã¹ËŒÍ§¼ÅÔµÃÒ¡ÒÃâ·Ã·Ñȹ áÅÐˌͧºÑ¹·Ö¡àÊÕ§¡ÒÃáÊ´§ 5) ẺºÔ§ (Bing mic) 㪌µÑé§âµÐÍÂÙ‹¡Ñº ·Õèâ´ÂäÁ‹à¤Å×è͹ŒÒ 6) ẺäÁ‹ÁÕÊÒ (Wireless mic) ໚¹à¤Ã×èͧʋ§ÇÔ·ÂØ Ãкº F.M ¢¹Ò´àÅç¡¡íÒÅѧʋ§µèíÒ ãªŒ¡Ñºà¤Ã×èͧÃѺÇÔ·ÂØÃкº F.M Ê‹§¤Å×è¹ ä»ä´Œä¡Å »ÃÐÁÒ³ 50-200 àÁµÃà·‹Ò¹Ñé¹
- 19. ¤Ø³ÊÁºÑµ¢Í§äÁâ¤Ã⿹ᵋÅÐẺµ‹Ò§¡Ñ¹¢Ö¹ÍÂÙ¡º Ô é ‹ Ñ ¼ÅµÍºÊ¹Í§¤ÇÒÁ¶Õè ໚¹¤ÇÒÁÊÒÁÒö • µÍºÊ¹Í§¤ÇÒÁ¶Õèä´ŒàÃÕº áÅÐà¡çº ¤ÇÒÁ¶Õèä´Œ¡ÇŒÒ§ • äÁâ¤Ã⿹·ÑèÇæ ä» Áռŵͺʹͧ¤ÇÒÁ¶Õèä´ŒàÃÕº µÑé§áµ‹ 100-10000 àÎÔ÷« ໚¹Í‹ҧ¹ŒÍ¡Òõͺʹͧ¤ÇÒÁ¶Õè ä´ŒÁÒ¡¹ŒÍ à¾Õ§㴹Ñé¹¢Öé¹ÍÂÙ‹¡º¡ÒÃ㪌§Ò¹ Ñ • ઋ¹ ¡ÒÃáÊ´§´¹µÃÕµŒÍ§ãªŒäÁâ¤Ã⿹·ÕèµÍºÊ¹Í§¤ÇÒÁ¶Õè¡ÇŒÒ§ »ÃÐÁÒ³ 50-15000 àÎÔ÷« â´ÂÃÒºàÃÕºàÊÁ͡ѹ «Öè§ä´Œá¡‹ äÁâ¤Ã⿹Ẻ䴹ÒÁÔ¤ ẺÃÔººÍ¹ ໚¹µŒ¹
- 20. ¤Ø³ÊÁºÑµ¢Í§äÁâ¤Ã⿹ᵋÅÐẺµ‹Ò§¡Ñ¹¢Ö¹ÍÂÙ¡º Ô é ‹ Ñ ¤ÇÒÁäÇ㹡ÒÃÃѺàÊÕ§ • à¹×èͧ¨Ò¡¤Å×è¹àÊÕ§¼‹Ò¹ÍÒ¡ÒÈä»ÊÙ‹äÁâ¤Ã⿹ • äÁâ¤Ã⿹¨Ðà»ÅÕ蹤Å×è¹àÊÕ§໚¹ÊÑҳ俿‡Ò áÅÐÁÕ¤ÇÒÁáç ¾Í·Õè¨Ð»‡Í¹à¢ŒÒÊÙ‹à¤Ã×èͧ¢ÂÒÂàÊÕ§䴌äÁâ¤Ã⿹·ÕèÁÕ¤ÇÒÁäÇ¡ÒÃÃѺ àÊÕ§ÊÙ§ ¨ÐÊÒÁÒöÃѺ¤Å×è¹àÊÕ§·ÕèÍÂÙ‹Ë‹Ò§¨Ò¡äÁâ¤Ã⿹䴌 • äÁâ¤Ã⿹·ÑèÇä» ¨ÐÁÕ¤ÇÒÁáç¢Í§ÊÑÒ³·Õèä´ŒÍÍ¡ÁÒ໚¹à´«ÔàºÅ (dB) µèíÒ¡Ç‹Ò 1 âÇÅ· ઋ¹ -60 dB ËÃ×Í -50 dB ¤‹Ò dB ໚¹Åº ÁÒ¡¨ÐÁÕ¤ÇÒÁäǵèíÒ¡Ç‹Ò¤‹Ò dB ·Õè໚¹Åº¹ŒÍ ¹Ñ蹤×Í -60dB ÁÕ ¤ÇÒÁäǵèíÒ¡Ç‹Ò -50dB
- 21. ¤Ø³ÊÁºÑµ¢Í§äÁâ¤Ã⿹ᵋÅÐẺµ‹Ò§¡Ñ¹¢Ö¹ÍÂÙ¡º Ô é ‹ Ñ ÍÔÁ¾Õá´¹« (Impedance) • ËÁÒ¶֧ ¤ÇÒÁµŒÒ¹·Ò¹¢Í§äÁâ¤Ã⿹·Õèà¡Ô´¢Öé¹¢³Ð ÁÕÊÑÒ³ ËÃ×Í¡ÃÐáÊ俼‹Ò¹ • ÁÕ˹‹ÇÂ໚¹âÍËÁ (Ohm) ÁÕ 2 ª¹Ô´ 1) ÍÔÁ¾á´¹«ÊÙ§ (High Impedance) ÁÕ¤‹Ò Impedance ÍÂÙ‹ ÃÐËÇ‹Ò§ 5-10, 50 áÅÐ 100 K Ohm «×觨Ðà¢Õ¹µÔ´äÇŒº¹µÑÇ äÁâ¤Ã⿹¹Õé ¤×Í ª¹Ô´·ÕèäÁ‹¤ÇÃ㪌ÊÒÂÂÒÇà¡Ô¹¡Ç‹Ò 25 ¿Øµ ¨Ð·íÒãËŒ à¡Ô´àÊÕ§ÎÑÁáÅÐÊÙàÊÕ¡íÒÅѧä»ã¹ÊÒ 2) ÍÔÁ¾Ôá´¹«µèíÒ (Low Impedance) ÁÕ¤‹Ò Impedance 200- 600 âÍÁË ãªŒÊÒÂäÁâ¤Ã⿹䴌ÂÒÇ¡Ç‹Ò 100 ¿Øµ
- 22. ¡ÒÃ㪌äÁâ¤Ã⿹áÅСÒúíÒÃاÃÑ¡ÉÒ 1. äÁ‹à¤ÒÐËÃ×ÍໆÒäÁâ¤Ã⿹ 2. Í‹ÒãËŒäÁâ¤Ã⿹ŌÁËÃ×͵¡à»š¹Íѹ¢Ò´ 3. äÁ‹¤Çþٴã¡ÅŒËÃ×ÍË‹Ò§äÁâ¤Ã⿹à¡Ô¹ä» â´Â·ÑèÇ æ 仨оٴˋҧ »ÃÐÁÒ³ 1-4 ¹ÔéÇ ¶ŒÒäÁâ¤Ã⿹ÃѺàÊÕ§äÇÁÒ¡¤Çþٴˋҧ»ÃÐÁÒ³ 6-12 ¹ÔéÇ 4. ºÃÔàdzã¡ÅŒ æ äÁâ¤Ã⿹¤Çâ¨Ñ´àÊÕ§ú¡Ç¹Í‹ÒãËŒËÁ´ ઋ¹ ¾Ñ´ÅÁ, à¤Ã×èͧ»ÃѺÍÒ¡ÒÈ 5. ¤ÇõԴµÑé§äÁâ¤Ã⿹ ãˌˋҧ¨Ò¡ÅíÒ⾧ ¶ŒÒ¨íÒ໚¹¨ÐµŒÍ§ÍÂÙ‹ã¡ÅŒ¡Ñ¹ ¤ÇÃËѹ˹ŒÒ ÅíÒ⾧˹ÕÍÍ¡ä»äÁ‹ãËŒÁÒµÑ駩ҡ¡ÑºäÁâ¤Ã⿹ 6. äÁ‹¤ÇÃãËŒäÁâ¤Ã⿹ໂ¡¹éíÒËÃ×ͧ͢àËÅÇ 7. ËÅѧ¨Ò¡àÅԡ㪌äÁâ¤Ã⿹¤ÇÃà¡çºãÊ‹¡Å‹Í§äÇŒãËŒàÃÕºÌÍ à¾×èÍ»‡Í§¡Ñ¹ ½Ø†¹ÅÐÍͧ áÅÐ ¡ÒáÃзº¡ÃÐà·×͹
- 23. ÈÖ¡ÉÒ´ŒÇµ¹àͧµÒÁ»¯Ô·¹ (3 ¸.¤. 54) Ô 54) ÈÖ¡ÉÒâ»Ãá¡ÃÁ Audacity ¨Ò¡¤Ù‹Á×Í - à¤Ã×èͧÁ×ÍáÅСÒÃ㪌§Ò¹àº×éͧµŒ¹ - ¡ÒûÃѺᵋ§àÊÕ§ - ¡ÒõѴµ‹ÍàÊÕ§ - ¡ÒÃá¡àÊÕ§¨Ò¡ä¿ÅÇÕ´ÔâÍ - ¡Òúѹ·Ö¡ä¿ÅàÊÕ§ # 㺧ҹ·Õè 2 à¡çº¤Ðá¹¹ 10 ¢ŒÍ (choice) (㹤ҺàÃÕ¹ 3 ¸.¤.)