{"id":3334,"date":"2014-07-25T17:18:47","date_gmt":"2014-07-25T08:18:47","guid":{"rendered":"http:\/\/pchero21.com\/?p=3334"},"modified":"2014-07-25T17:38:06","modified_gmt":"2014-07-25T08:38:06","slug":"sample-rate%ec%83%98%ed%94%8c-%eb%a0%88%ec%9d%b4%ed%8a%b8%ec%99%80-bit-rate%eb%b9%84%ed%8a%b8-%eb%a0%88%ec%9d%b4%ed%8a%b8","status":"publish","type":"post","link":"http:\/\/pchero21.com\/?p=3334","title":{"rendered":"Sample rate \/ Bit rate"},"content":{"rendered":"

Sample rate(\uc0d8\ud50c \ub808\uc774\ud2b8)\uc640 Bit rate(\ube44\ud2b8 \ub808\uc774\ud2b8)<\/p>\n

\ucd9c\ucc98 : http:\/\/ospace.tistory.com\/101?srchid=BR1http%3A%2F%2Fospace.tistory.com%2F101<\/a><\/p>\n

 <\/p>\n

———————————————————————————————————————-<\/p>\n

\uc791\uc131\uc790: \ubc15\uc7ac\uc131(ospace114@empal<\/a>.\ucef4)
\n\uc791\uc131\uc77c: 2008.4.21<\/p>\n

* \ud3b8\uc758\uc0c1 \ud3c9\uc5b4\ub97c \uc0ac\uc6a9\ud588\uc2b5\ub2c8\ub2e4.
\n* \ud37c\uac08\ub54c\ub294 \ucd9c\ucc98\ub97c \ubc1d\ud788\ub294 \uc13c\uc2a4 \ubd80\ud0c1\ud574\uc694.<\/p>\n

\uc544\ub798 \ub0b4\uc6a9\uc740 \ub098\ub984\ub300\ub85c \uc5ec\ub7ec \ubd84\uc5d0\uac8c \ub3c4\uc6c0\uc774 \ub418\uace0\uc790 \uc815\ub9ac\ud558\uc600\uc2b5\ub2c8\ub2e4. \uadf8\ub9bc\uae4c\uc9c0 \uc788\uc73c\uba74 \ub354 \uc88b\uc744\ud150\ub370 \uc2dc\uac04 \uad00\uacc4\uc0c1 \uae00\ub85c\ub9cc \uc791\uc131\ud588\uc2b5\ub2c8\ub2e4.<\/p>\n

\uc778\ud130\ub137 \uc0c1\uc5d0\uc11c \uc0d8\ud50c\ub808\uc774\ud2b8\uc640 \ube44\ud2b8\ub808\uc774\ud2b8\uc758 \uc815\uc758\ub294 \uac04\ud639 \uc788\ub2e4. \uc0d8\ud50c\ub808\uc774\ud2b8\ub294 \uc774\ud574\uac00 \uc27d\uc9c0\ub9cc, \ube44\ud2b8\ub808\uc774\ud2b8\ub294 \uc27d\uac8c \uc640\ub2eb\uc9c0\uc54a\ub294\ub2e4. \uc989 \uc54c\uc1a1\ub2ec\uc1a1\ud558\ub2e4. \ube44\ud2b8\ub808\uc774\ud2b8\uc640 \uc624\ub514\uc624 \ud3ec\uba67\uc5d0\uc11c \uc5b4\ub5a4 \uad00\uacc4\ub97c \uac00\uc9c0\uace0 \uc788\ub294\uc9c0 \uc54c \uc218 \uc5c6\ub2e4.<\/p>\n

\uc774\uc5d0 \ub300\ud574\uc11c \uc2e4\uc81c \ub370\uc774\ud130 \ub7c9\uc778 \ud30c\uc77c \ud06c\uae30\ub97c \uac00\uc9c0\uace0 \ub450 rate(\ub808\uc774\ud2b8)\uac04\uc5d0 \ube44\ub8cc\ub97c \ud574\ub450\uc5c8\ub2e4. \uadf8\ub9ac\uace0 \uae00\uc758 \ub0b4\uc6a9\uc740 \uc624\ub514\uc624\uc5d0 \ub300\ud574\uc11c \uc5b4\ub290\uc815\ub3c4 \uc9c0\uc2dd\uc744 \uac00\uc9c0\uace0\u00a0 \uc788\ub294 \ubd84\ub4e4\uc744 \ub300\uc0c1\uc73c\ub85c \uc791\uc131\ud558\uc600\ub2e4.
\n\ucd08\ubcf4\uc790\ubd84 \ub4e4\uc740 \ub2e4\ub978 \uacf3\uc5d0\uc11c \uae30\ubcf8\uc801\uc778 \uc6a9\uc5b4\uc640 \uc9c0\uc2dd\uc744 \ucc3e\uc544\ubcf4\uae38 \ubc14\ub780\ub2e4.<\/p>\n

\uc704\uc758 \ub2e8\uc5b4\ub294 \uc624\ub514\uc624 \ub2e4\ub8e8\uba74\uc11c \ub9e4\uc6b0 \ub9ce\uc774 \uc811\ud558\ub294 \ub2e8\uc5b4\uc774\ub2e4. \uc77c\ub2e8 \uac04\ub2e8\ud558\uac8c \uc815\ub9ac\ub97c \ud574\ubcf4\uc790.
\n\uba3c\uc800 sample(\uc0d8\ud50c)\uc744 \uba3c\uc800 \uc54c\uc544 \ubcf4\uc790.<\/p>\n

\uc0d8\ud50c\uc740 \ub9d0\uadf8\ub300\ub85c \uc0d8\ud50c\uc774\ub2e4. \uc544\ub0a0\ub85c\uadf8\uc758 \uc5f0\uc18d\ub41c \ub370\uc774\ud130\ub97c \ub514\uc9c0\ud138\ub85c \ud45c\ud604\ud558\uae30\uc5d0\ub294 \ud55c\uacc4\uac00 \uc788\ub2e4. \uc544\ub0a0\ub85c\uadf8\uc758 \uc5f0\uc18d\ub41c \uac12\uc740 \ubb34\ud55c \ub300\ub85c \ucabc\uac24 \uc218 \uc788\uae30 \ub54c\ubb38\uc774\ub2e4. \uadf8\ub807\uae30\uc5d0 \uadf8\uc911\uc5d0 \ub300\ud45c\uc801\uc778 \ud2b9\uc815 \uac12(\uc0d8\ud50c)\uc744 \ucd94\ucd9c\ud574\uc11c \uc0ac\uc6a9\ud558\uac8c \ub41c\ub2e4. \ub2e4\uc218\uc758 \uc0d8\ud50c\ub4e4 \uc9d1\ud569\uc73c\ub85c \uc18c\ub9ac\ub97c \ud45c\ud604\ud560 \uc218 \uc788\ub2e4.
\n<\/span><\/p>\n

Sample rate (\uc0d8\ud50c\ub808\uc774\ud2b8)
\n<\/strong><\/p>\n

\uc774\ub294 \uc0d8\ud50c\uc758 \ube48\ub3c4 \uc218\uc774\ub2e4. \uc880\ub354 \uc9c1\uc811\uc801\uc73c\ub85c \ub9d0\ud558\uba74, 1\ucd08\ub2f9 \ucd94\ucd9c\ub418\ub294 \uc0d8\ud50c \uac1c\uc218\uc774\ub2e4. \uc624\ub514\uc624\uc5d0\uc11c 44.1KHz(44100Hz), 22KHz(22050Hz)\ub97c \ub9d0\ud55c\ub2e4. \uad04\ud638\uc548\uc5d0 \uac12\uc740 \uc880\ub354 \uc815\ud655\ud558\uac8c \ud45c\ud604\ud55c \uac12\uc774\ub2e4.
\n\uc608\ub97c \ub4e4\uc5b4 44.1KHz\ub294 1\ucd08\ub3d9\uc548\uc5d0 \uc0ac\ub9cc\uc0ac\ucc9c\ubc31(44100)\uac1c\ub85c \ub4f1\ubd84\ud574\uc11c \uc0d8\ud50c\uc744 \ucd94\ucd9c\ud55c\ub2e4. \uac12\uc774 \ucee4\uc9c8 \uc218\ub85d \ub354\uc6b1\ub354 \uc138\ubc00\ud558\uac8c \ub4f1\ubd84\ud574\uc11c \uc815\ud655\ud55c \uc624\ub514\uc624 \ub370\uc774\ud130\ub97c \ucd94\ucd9c\ud560 \uc218 \uc788\ub2e4. \uadf8\ub7ec\ub098 \ub108\ubb34 \ud070 \uac12\uc740 \ucd94\ucd9c\ub418\ub294 \ub370\uc774\ud130 \ud06c\uae30\ub97c \ub108\ubb34 \ud06c\uac8c \ub9cc\ub4e4\uc5b4\uc11c \ucc98\ub9ac\ud558\uae30 \ud798\ub4e4\ub2e4. \ubcf4\ud1b5 44.1KHz\uac00 CD\uc74c\uc9c8\ub85c \ub9ce\uc774 \uc0ac\uc6a9\ub418\ubbc0\ub85c \uc774\uc774\uc0c1 \ucd94\ucd9c\ud558\ub294 \uac83\uc758 \ud2b9\uc218\ud55c \uacbd\uc6b0\ub97c \uc81c\uc678\ud558\uace0 \uc758\ubbf8\uac00 \uc5c6\ub2e4.<\/p><\/blockquote>\n

Bit rate (\ube44\ud2b8\ub808\uc774\ud2b8)
\n<\/strong><\/p>\n

\ucd08\ub2f9 \uc804\uc1a1\ub418\ub294 \ub370\uc774\ud130 \uc591\uc774\ub2e4. \uc9c1\uc811\uc801\uc73c\ub85c \ud45c\ud604\ud558\uba74 1\ucd08\ub2f9 \uc804\uc1a1\ub418\ub294 \ube44\ud2b8 \uc218\uc774\ub2e4. \uac04\ud639 \ud63c\ub3c8\ub418\ub294 \ub0b4\uc6a9\uc774 \ud3c9\uade0 \ub370\uc774\ud130 \uc804\uc1a1\ub7c9(Avarage Byte Rate)\uc774\ub2e4. \uc989 \uc2e4\uc81c \uac16\uace0 \uc788\ub294 \ub370\uc774\ud130 \ub7c9\uc73c\ub85c \uac19\uc740 \ud3ec\uba67\uc758 \uc6d0\ubcf8(PCM) \ub370\uc774\ud130 \ub7c9\uacfc \ud2c0\ub9ac\ub2e4. Bit rate\uac00 \ub098\uc62c \uc218 \uc788\ub294 \uac83\uc740 \uc624\ub514\uc624 \uc555\ucd95 \uae30\uc220\uc774 \ub098\uc624\uba74\uc11c \uac00\ub2a5\ud558\uac8c \ub418\uc5c8\ub2e4.
\n\ubcf4\ud1b5 192Kbps, 128Kbps, 56Kbps \ub4f1\uc744 \uc0ac\uc6a9\ud55c\ub2e4. 128Kbps\uc815\ub3c4\uba74 \uc74c\uc9c8\uc740 CD\uc74c\uc9c8\uc815\ub3c4 \ub418\uba74 192Kbps\uc815\ub3c4\uba74 \ucd5c\uc0c1\uc774\ub2e4. \uadf8 \uc774\uc0c1\uc774 \ub418\uba74 \uc6a9\ub7c9\uc774 \ub4e4\uc5b4\ub0a0\ubfd0 \ubcf4\ud1b5 \uc74c\uc9c8\uc744 \uc798 \uad6c\ubd84\ud558\uc9c0 \ubabb\ud55c\ub2e4.<\/p><\/blockquote>\n

\uc2e4\uc81c \uac04\ub2e8\ud55c \uc608\ub97c \ubcf4\uba74\uc0ac \ub458\uac04\uc758 \uc0c1\uad00\uad00\uacc4\ub97c \uc0b4\ud45c\ubcf4\uc790.
\n\uc544\ub798\ub294 \uc0d8\ud50c \ud30c\uc77c \uc815\ubcf4\uc774\ub2e4.<\/p>\n

\ud30c\uc77c\uba85: stop.mp3<\/p>\n

\uc7ac\uc0dd\uc2dc\uac04: 4\ubd84 59\ucd08 (299\ucd08)
\n\ube44\ud2b8\ub808\uc774\ud2b8: 56Kbps (CBR)
\n\ucc44\ub110\uc218: 2 ch
\n\ube44\ud2b8: 16 bit
\n\uc0d8\ud50c\ub808\uc774\ud2b8:22050 Hz
\n\ud06c\uae30: 2,094,939byte<\/p>\n

\ud30c\uc77c\uba85: stop.pcm
\n\ud06c\uae30: 26,394,624 byte<\/p>\n

MP3 \ud30c\uc77c \ud06c\uae30 \uacc4\uc0b0
\n<\/strong>
\n\uba3c\uc800 MP3 \ud30c\uc77c \ud06c\uae30\ub97c \uacc4\uc0b0\ud574 \ubcf4\uc790. \uc774\ub54c \ud544\uc694\ud55c \uac12\uc774 \uc7ac\uc0dd\uc2dc\uac04\uacfc \ube44\ud2b8\ub808\uc774\ud2b8\uc774\ub2e4.<\/p>\n

\ud30c\uc77c\ud06c\uae30 = \uc7ac\uc0dd\uc2dc\uac04 * \ube44\ud2b8\ub808\uc774\ud2b8 \/ 8<\/p>\n

8\ub97c \ub098\ub220\uc900 \uc774\uc720\ub294 \ube44\ud2b8\uc5d0\uc11c \ubc14\uc774\ud2b8\ub85c \ubcc0\ud658\ud558\uae30 \uc704\ud55c \uac83\uc774\ub2e4.<\/p>\n

299 * 56000 \/ 8 = 2,093,000 (byte)<\/p>\n

\uc2e4\uc81c \uac12\uacfc \uc57d\uac04\uc758 \uc624\ucc28\uac00 \uc788\ub294 \uc774\ub294 \uc7ac\uc0dd \uc2dc\uac04\uc774 1\ucd08 \uc774\ud558\uc758 \uc2dc\uac04\uc744 \uace0\ub824\ud558\uc9c0 \uc54a\uc558\uace0, MP3\uc758 \ud14c\uadf8\uc640 \ud5e4\ub354 \uc815\ubcf4\ub97c \uace0\ub824\ud558\uc9c0 \uc54a\uc558\uae30 \ub54c\ubb38\uc774\ub2e4. \ube44\ud2b8 \ub808\uc774\ud2b8\ub294 \uc2e4\uc81c\ub85c \ucc98\ub9ac\ub418\ub294 \ub370\uc774\ud130 \ud06c\uae30\uc774\ubbc0\ub85c \uc2e4\uc81c \uc7ac\uc0dd\uc2dc\uac04\uacfc \uacf1\ud568\uc73c\ub85c\uc11c \uc2e4\uc81c \ub370\uc774\ud130 \ud06c\uae30\ub97c \uc54c\uc544\ub0bc \uc218 \uc788\ub2e4.<\/p>\n

PCM \ub370\uc774\ud130 \ucc98\ub9ac\ub7c9<\/strong><\/p>\n

\uc6d0\ub798 \ucd08\ub2f9 \ub370\uc774\ud130 \ub7c9\uc774 \ub2e4\uc74c\uacfc \uac19\uc774 \ucc98\ub9ac\ub41c\ub2e4\uace0 \uc54c\uace0 \uc788\uc744 \uac83\uc774\ub2e4.<\/p>\n

\ucd08\ub2f9 \ub370\uc774\ud130 \ub7c9 = \uc0d8\ud50c\ub808\uc774\ud2b8 * \ucc44\ub110 \uc218 * \ube44\ud2b8<\/p>\n

\uadf8\ub7ec\ubbc0\ub85c,<\/p>\n

22050 * 2 * 16 = 705,600 (bit)<\/p>\n

\uc989, \uc57d 705Kbps\uac00 \ub41c\ub2e4. \ubc14\ub85c \uc774 \uac12\uc774 \uc2e4\uc81c PCM\uc5d0\uc11c \ucc98\ub9ac\ub418\ub294 \ub370\uc774\ud130 \ub7c9\uc774\ub2e4. \uadf8\ub7ec\ub098 MP3\ub85c \ub418\uba74\uc11c 705Kbps\uac12\uc774 56Kbps \uac12\uc73c\ub85c \uc57d 12\ubc30 \ucc28\uc774\uac00 \ub09c\ub2e4.<\/p>\n

PCM \ud30c\uc77c \ud06c\uae30 \uacc4\uc0b0
\n<\/strong>
\nPCM \ud30c\uc77c \uacc4\uc0b0\uc5d0\uc11c\ub294 \ube44\ud2b8 \ub808\uc774\ud2b8\uac00 \uc5c6\ub2e4. PCM \uc790\uccb4\uc5d0 \ubaa8\ub4e0 \ub370\uc774\ud130\ub97c \uc800\uc7a5\ud558\uace0 \uc788\uae30 \ub54c\ubb38\uc774\ub2e4. \uc989 \uc55e\uc5d0\uc11c \uad6c\ud55c PCM \ub370\uc774\ud130 \ucc98\ub9ac\ub7c9\uc744 \uc774\uc6a9\ud574\uc11c \uad6c\ud558\uba74 \ub41c\ub2e4.<\/p>\n

PCM \ud30c\uc77c \ud06c\uae30 = PCM \ub370\uc774\ud130 \ucc98\ub9ac\ub7c9 * \uc7ac\uc0dd\uc2dc\uac04 \/ 8<\/p>\n

8\ub85c \ub098\ub208\uc774\uc720\ub294 \ube44\ud2b8\ub97c \ubc14\uc774\ud2b8\ub85c \ubcc0\uacbd\ud558\uae30 \uc704\ud574\uc11c\uc774\ub2e4.<\/p>\n

705,000 * 299 \/ 8 = 26,349,375 (byte)<\/p>\n

\uc2e4\uc81c \ud06c\uae30\uc778 26,394,624\uc640 \uc57d\uac04\uc758 \ucc28\uc774\uac00 \uc788\ub2e4. \uc774\ub294 \uc704\uc758 \uacc4\uc0b0\uc2dc 1\ucd08 \uc774\ud558\uc758 \uc2dc\uac04\uc744 \uace0\ub824\ud558\uc9c0 \uc54a\uc558\uae30 \ub54c\ubb38\uc774\ub2e4.<\/p>\n

\ub9c8\ubb34\ub9ac<\/strong><\/p>\n

\uc989 \ub2e4\uc2dc \ub9d0\ud558\uba74 PCM \ud30c\uc77c\uc5d0\uc11c bit rate\ub294 pcm \ub370\uc774\ud130 \ucc98\ub9ac\ub7c9\uacfc \uac19\ub2e4. \uc774\ub97c \uacc4\uc0b0 \uc2dd\uc73c\ub85c \ubcc0\uacbd\ud558\uba74,<\/p>\n

\ube44\ud2b8 \ub808\uc774\ud2b8 = \uc0d8\ud50c \ub808\uc774\ud2b8 * \ucc44\ub110 \uc218 * \ube44\ud2b8<\/p>\n

\uadf8\ub7ec\ub098 MP3\uc778 \uacbd\uc6b0\ub294 \uc704 \uc2dd\uc774 \ub9de\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n

\uc2e4\uc81c \ud30c\uc77c \ud06c\uae30\ub97c \ubcf4\uc544\ub3c4 10\ubc30 \uc774\uc0c1\uc758 \ucc28\uc774\uac00 \ubc1c\uc0dd\ud55c\ub2e4. \uc774 \ucc28\uc774\uac00 MP3\uc640 PCM\uc758 \ube44\ud2b8\ub808\uc774\ud2b8 \ucc28\uc774\uc640 \ube44\uc2b7\ud558\ub2e4. \uadf8\ub9ac\uace0 MP3 \uc790\uccb4 \uc74c\uc9c8\ub3c4 \ub098\uc058\uc9c0 \uc54a\uae30\uc5d0 MP3 \ud30c\uc77c\uc744 \uc0ac\uc6a9\ud558\uac8c \ub41c\ub2e4.<\/p>\n

\uc704\uc758 MP3 \uc0d8\ud50c\uc740 \uc74c\uc9c8\uc744 \ub9ce\uc774 \uc800\ud558\uc2dc\ucf30\uae30 \ub54c\ubb38\uc5d0 \uc74c\uc545 \uac10\uc0c1\uc6a9\uc73c\ub85c \uc801\ud569\ud558\uc9c0 \uc54a\uc9c0\ub9cc, \uc628\ub77c\uc778\uc0c1\uc5d0\uc11c \uac04\ub2e8\ud788 \uc7ac\uc0dd\ud558\ub294 \ubaa9\uc801\uc774\ub77c\uba74 \uc801\ud569\ud55c \ud3ec\uba67\uc774\ub2e4. \uc989 \uc801\uc808\ud788 \uc6d0\ud558\ub294 \uc6a9\ub3c4\ub85c \uc74c\uc9c8\uc744 \uc870\uc808\ud574\uc11c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc73c\uba74 \uadf8\ub9cc\ud07c \ucc98\ub9ac\ub418\ub294 \ub370\uc774\ud130 \ub7c9\uc744 \uc870\uc808\ud560 \uc218 \uc788\uac8c \ub41c\ub2e4.<\/p>\n

\uc8fc\uc758\ud560 \uac83\uc740 bit rate\ub97c CBR(Constant Bit Rate)\ub9cc \ub2e4\ub8e8\uc5c8\ub2e4. \uc2e4\uc81c\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uac83\uc774 \ucd94\uac00\ub85c \uc788\ub2e4.<\/p>\n