อ้างอิง

อ้างอิง

http://computerdodee.blogspot.com/2009/11/speaker.html
th.wikipedia.org/wiki/ไมโครโฟน

https://web.ku.ac.th/schoolnet/snet1/hardware/scan.htm
http://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%A7%E0%B9%87%E0%B8%9A%E0%B9%81%E0%B8%84%E0%B8%A1
http://th.wikipedia.org/wiki/%E0%B8%A5%E0%B8%B3%E0%B9%82%E0%B8%9E%E0%B8%87
http://th.wikipedia.org/wiki/%E0%B9%84%E0%B8%A1%E0%B9%82%E0%B8%84%E0%B8%A3%E0%B9%82%E0%B8%9F%E0%B8%99