1-2Àå :  ½ÅÈ£ÀÇ Ç¥Çö

1. ½ÅÈ£¿Í domain

IEEE¿¡¼­ Á¤ÀÇÇÑ ½ÅÈ£ÀÇ Àǹ̴ ´ÙÀ½°ú °°´Ù.

 ½ÅÈ£ (Signal) : Åë½Å ½Ã½ºÅÛÀ» ÅëÇؼ­ Àü´ÞµÇ´Â Áö½Ä, Á¤º¸, ¶Ç´Â È¿°ú

   ÇϳªÀÇ ½ÅÈ£´Â ±âº»ÀûÀ¸·Î µÎ°¡Áö domain¿¡¼­ °üÂûÇÒ ¼ö ÀÖ´Ù. ù°·Î ½Ã°£¿µ¿ª(Time domain) ¿¡¼­´Â ½Ã°£ÀÌ Èê·¯°¡¸é¼­ º¯ÇÏ´Â Àü¾Ð/Àü·ù µîÀÇ ½ÅÈ£ÀÇ Æ¯¼ºÀ» º¼ ¼ö ÀÖÀ¸¸ç, µÑ°·Î ÁÖÆļö¿µ¿ª(Frequency domain) ¿¡¼­´Â ±× ½ÅÈ£°¡ °¡Áø ÁÖÆļö ¼ººÐµéÀÇ ºÐÆ÷¸¦ º¼ ¼ö ÀÖ´Ù.

 

2. real ½ÅÈ£¿Í complex ½ÅÈ£

  ÀϹÝÀûÀ¸·Î ½ÅÈ£´Â ¼öÇÐÀûÀÎ °è»êƯ¼º¿¡ µû¶ó real ½ÅÈ£¿Í real/ imaginary°¡ µ¿½Ã¿¡ Á¸ÀçÇÏ´Â complex ½ÅÈ£·Î ºÐ·ùµÈ´Ù.

Real Signal : cos ¥øt

Complex Signal : cos ¥øt + j sin ¥øt

 

3. ½ÅÈ£ÀÇ plot

  Åë½Å½Ã½ºÅÛ ½Ã¹Ä·¹À̼ǿ¡¼­´Â ¿©·¯ °¡Áö ÇüÅÂÀÇ ½ÅÈ£¸¦ È­¸é¿¡ Ç÷ÎÆÃÇÏ°Ô µÇ´Âµ¥, °¡Àå ±âº»ÀÌ µÇ´Â ½Ã°£Ãà°ú ÁÖÆļö Ãà¿¡¼­ÀÇ ÇÃ·Ô ÇüÅ´ ´ÙÀ½°ú °°´Ù.

 ½Ã°£ ¿µ¿ª ½ÅÈ£ Ç÷Ô

  ½Ã°£ÀÌ Èê·¯°¨¿¡ µû¶ó ½ÅÈ£ÀÇ Àü¾ÐÀÌ º¯ÇÏ´Â Çü»óÀ¸·Î Ç÷ÔÇÑ´Ù. Ç÷ԵǴ ´ë»ó¿¡ µû¶ó¼­ Real Plot, Imaginary Plot, Waveform PlotÀÇ 3°¡Áö¸¦ ÁÖ·Î »ç¿ëÇÑ´Ù.

 

 ÁÖÆļö ¿µ¿ª ½ÅÈ£ Ç÷Ô

  ½ÅÈ£°¡ °¡Áø ÁÖÆļö ¼ººÐµéÀ» ±× Àü·ÂÀÇ ºÐÆ÷¿¡ µû¶ó º¸¿©ÁØ´Ù. ´ÜÀÏÁÖÆļöÀÎ °æ¿ì¿¡´Â ÇϳªÀÇ peakÇü»óÀ¸·Î ³ªÅ¸³ª¸ç ¿©·¯ ÁÖÆļöµéÀÌ ÇÕ¼ºµÈ °æ¿ì¿¡´Â ¿©·¯ °³ÀÇ peakµéÀÌ ¸ðÀÎ Çü»óÀ¸·Î ³ªÅ¸³­´Ù. ½ÅÈ£ÀÇ Æ¯¼º¿¡ µû¶ó ÀÌ·¯ÇÑ peak´Â ³Ð°Å³ª Á¼Àº ÆøÀ» ³ªÅ¸³»±âµµ Çϴµ¥, ÀÌ°ÍÀ» ´ë¿ªÆø(bandwidth)¶ó°í ÇÑ´Ù. Ç¥ÇöµÇ´Â Àü·ÂÀÇ °è»ê ´ÜÀ§¿¡ µû¶ó¼­ FFT Magnitude Plot ¶Ç´Â FFT Log Plot¸¦ »ç¿ëÇÑ´Ù.

 

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