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		<title>Upgrade my life skills today~~(^▽^)┘</title>
		<link>http://www.samsiki.net/</link>
		<description>&quot;어떤 문제에 부딪히면 나는 미리 남보다 시간을 두세 곱절 더 투자할 각오를 한다. 그것이야말로 평범한 두뇌를 지닌 내가 할 수 있는 유일한 방법이다.&quot; 
- 안철수의 &#039;CEO 안철수, 영혼이 있는 승부&#039; 중에서 -</description>
		<language>ko</language>
		<pubDate>Thu, 18 Feb 2010 13:23:15 +0900</pubDate>
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		<managingEditor>SamSiKi</managingEditor>
		<image>
		<title>Upgrade my life skills today~~(^▽^)┘</title>
		<url><![CDATA[http://cfile24.uf.tistory.com/image/14683C0E4B611E225B623E]]></url>
		<link>http://www.samsiki.net/</link>
		<description>&quot;어떤 문제에 부딪히면 나는 미리 남보다 시간을 두세 곱절 더 투자할 각오를 한다. 그것이야말로 평범한 두뇌를 지닌 내가 할 수 있는 유일한 방법이다.&quot; 
- 안철수의 &#039;CEO 안철수, 영혼이 있는 승부&#039; 중에서 -</description>
		</image>
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			<title>파트타임 하실분~!</title>
			<link>http://www.samsiki.net/314</link>
			<description>&lt;br /&gt;
물론 자격요건이 있습니다..&lt;br /&gt;
&lt;br /&gt;용돈 벌어 쓰실분도 좋고, 요리에 관심이 있으신분도 좋습니다. &lt;br /&gt;
&lt;br /&gt;쉐프가 프랑스 요리를 배웠으니 가서 사정해보는 것도..ㅋㅋ&lt;br /&gt;
&lt;br /&gt;여기는 경기도 용인시 기흥구 구갈동 강남대학교 근처입니다.&lt;br /&gt;
&lt;br /&gt;자세한건 아래에...&lt;br /&gt;
&lt;br /&gt;&lt;A href=&quot;http://burger-saloon.com/notice/47&quot;&gt;http://burger-saloon.com/notice/47&lt;/A&gt;&lt;br /&gt;
&lt;br /&gt;&lt;div class=&quot;imageblock center&quot; style=&quot;text-align: center; clear: both;&quot;&gt;&lt;a href=&quot;http://cfile29.uf.tistory.com/original/182B05194B7CBFE34B74D5&quot; rel=&quot;lightbox&quot; target=&quot;_blank&quot;&gt;&lt;img src=&quot;http://cfile29.uf.tistory.com/image/182B05194B7CBFE34B74D5&quot; alt=&quot;&quot; filemime=&quot;image/jpeg&quot; filename=&quot;파트타임공지.jpg&quot; height=&quot;447&quot; width=&quot;600&quot;/&gt;&lt;/a&gt;&lt;/div&gt;&lt;div class=&quot;entry-ccl&quot; style=&quot;clear: both; text-align: right; margin-bottom: 10px&quot;&gt;
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&lt;fieldset style=&quot;margin:20px 0px 20px 0px;padding:5px;&quot;&gt;&lt;legend&gt;&lt;span&gt;&lt;strong&gt;크리에이티브 커먼즈 라이선스&lt;/strong&gt;&lt;/span&gt;&lt;/legend&gt;&lt;!--Creative Commons License--&gt;&lt;div style=&quot;float: left; width: 88px; margin-top: 3px;&quot;&gt;&lt;a rel=&quot;license&quot; href=&quot;http://creativecommons.org/licenses/by-nc-nd/2.0/kr/&quot; target=_blank&gt;&lt;img alt=&quot;Creative Commons License&quot; style=&quot;border-width: 0&quot; src=&quot;http://i.creativecommons.org/l/by-nc-nd/2.0/kr/88x31.png&quot;/&gt;&lt;/a&gt;&lt;/div&gt;&lt;div style=&quot;margin-left: 92px; margin-top: 3px; text-align: justify;&quot;&gt;이 저작물은 &lt;a rel=&quot;license&quot; href=&quot;http://creativecommons.org/licenses/by-nc-nd/2.0/kr/&quot; target=_blank&gt;크리에이티브 커먼즈 코리아 저작자표시-비영리-변경금지 2.0 대한민국 라이선스&lt;/a&gt;에 따라 이용하실 수 있습니다.
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			<category>☞ 끄적끄적 ☜</category>
			<category>강남대</category>
			<category>구갈동</category>
			<category>아르바이트</category>
			<category>파트타임</category>
			<author>SamSiKi</author>
			<guid>http://www.samsiki.net/314</guid>
			<comments>http://www.samsiki.net/314#entry314comment</comments>
			<pubDate>Thu, 18 Feb 2010 13:21:00 +0900</pubDate>
		</item>
		<item>
			<title>heap &amp; stack</title>
			<link>http://www.samsiki.net/313</link>
			<description>&lt;P&gt;&lt;B&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;stack&lt;/SPAN&gt;&lt;/B&gt;&lt;/P&gt;
&lt;P&gt;&lt;FONT face=휴먼엑스포&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;스택이란 여러 개의 데이타 항목들이 일정한 순서로 나열된 자료 구조로 한쪽 끝에서만 새로운 항목을 삽입하거나 기존 항목을 삭제할 수 있도록 고안된 것이다. 스택은 동전을 넣고 뺄 수 있도록 되어 있는 동전 케이스와 같은 작동 원리를 가지고 있다. 삽입된 동전들은 케이스 내부에 일정한 순서로 저장된다.&amp;nbsp;먼저 삽입된 동전은 케이스의 가장 아래쪽에 위치하고 가장 최근에 삽입된동전은 입구에 놓인다. 스택에 저장된 데이타 항목들 중에 먼저 삽입된 것은 나중에 삭제되고, 나중에 삽입된 것이 먼저 삭제된다. 그래서 스택을 후입 선출 리스트Last- In-First-Out List)라고 부른다. 선입 선출법을 사용하는 큐와는 상반된 성질을 가진다. &lt;/SPAN&gt;&lt;/FONT&gt;&lt;/P&gt;
&lt;P&gt;&lt;FONT face=휴먼엑스포&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;&amp;nbsp;&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/P&gt;
&lt;P&gt;&lt;FONT face=휴먼엑스포&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;스택은 기저(base)로부터 데이타 항목들을 차례로 쌓아올린 모양을 가진다. &lt;/SPAN&gt;&lt;/FONT&gt;&lt;/P&gt;
&lt;P&gt;&lt;FONT face=휴먼엑스포&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;삽입과 삭제는 현재 저장된 최상위 항목이 위치한 top 에서만 일어난다.&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/P&gt;
&lt;P&gt;&lt;FONT face=휴먼엑스포&gt;&lt;/FONT&gt;&lt;FONT face=휴먼엑스포&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;top 위치는 &quot;스택 포인터&quot;라는 지시자가 가리킨다. &lt;/SPAN&gt;&lt;/FONT&gt;&lt;/P&gt;
&lt;P&gt;&lt;FONT face=휴먼엑스포&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;스택 포인터는 스택 기저에서 시작하여 항목이 삽입되면 하나 증가하고, &lt;/SPAN&gt;&lt;/FONT&gt;&lt;/P&gt;
&lt;P&gt;&lt;FONT face=휴먼엑스포&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;삭제되면 하나 감소한다. &lt;/SPAN&gt;&lt;/FONT&gt;&lt;FONT face=휴먼엑스포&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;스택에는 한계가 있어서 그 한계를 초과하도록 삽입할 수 없다. &lt;/SPAN&gt;&lt;/FONT&gt;&lt;/P&gt;
&lt;P&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;&amp;nbsp;&lt;/SPAN&gt;&lt;/P&gt;
&lt;P&gt;&lt;B&gt;&lt;FONT face=휴먼엑스포&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;heap&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/B&gt;&lt;/P&gt;
&lt;P&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;프로그램의 실행 도중에 요구되는 기억 장소를 할당하기 위하여 운영 체제에 예약되어 있는 기억 장소 영역. 프로그램에서 실행 도중에 자료를 저장하기 위하여 기억 장소를 요청하게 되면 운영 체제에서는 힙에 존재하는 기억 장소를 프로그램에 할당한다. 그리고 프로그램에서 기억 장치를 더 이상 필요로 하지 않는 경우에는 앞에서 할당 받았던 기억 장소를 운영체제에 반납하게 되는데, 이때 운영체제에서는 반납된 기억 장소를 다시 힙에 연결하게 된다. 힙에 대한 기억 장소는 포인터를 통해 동적으로 할당되거나 반환이 되는데 연결 리스트, 트리, 그래프 등과 같이 동적인 특성을 가지고 있는 자료구조에서 널리 사용된다.&lt;/SPAN&gt;&lt;/P&gt;
&lt;P&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;힙은 프로그램이 실행될 때까지 알 수 없는 가변적인 양만큼의 데이터를 저장하기 위해 프로그램의 프로세스가 사용할 수 있도록 미리 예약되어 있는 메인 메모리의 영역이다. 예를들면 하나의 프로그램은 처리를 위해 한명 이상의 사용자로부터 서로 다른 양의 입력을 받을 수 있으며 즉시 모든 입력데이터에 대해 처리를 시작한다. 운영체계로부터 이미 확보된 일정량의 힙 저장공간을 가지고 있으면 저장과 관련된 처리를 좀 더 쉽게 할 수 있으며 일반적으로 필요할 때마다 운영체계의 운영체계에게 매번 저장공간을 요청하는 것보다 빠르게 된다. 프로세스는 필요할 때 heap 블록을 요구하고 더 이상 필요 없을 때 반환하며 이따금씩 자투리 모으기를 수행함으로써 자신에게 할당된 heap을 관리하기도 한다. 여기서 자투리 모으기란 더 이상 사용되지 않는 블록들을 사용 가능한 상태로 만들고 또한 heap 내의 사용 가능한 공간을 인지함으로써 사용되지 않은 작은 조각들이 낭비되지 않도록 하는 것을 말한다. &lt;/SPAN&gt;&lt;/P&gt;
&lt;P&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;힙이란 컴퓨터의 기억 장소에서 그 일부분이 프로그램들에 할당되었다가 회수되는 작용이 되풀이 되는 영역이다. 스택영역은 엄격하게 후입선출(LIFO)방식으로 운영되는데 비해 힙은 프로그램들이 요구하는 블록의 크기나 요구/횟수 순서가 일정한 규칙이 없다는 점이 다르다. 대개 힙의 기억장소는 포인터변수를 통해 동적으로 할당받고 돌려준다. 이는 연결 목록이나 나무, 그래프 등의 동적인 자료 구조를 만드는데 꼭 필요한 것이다.&lt;/SPAN&gt;&lt;/P&gt;
&lt;P&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;그럼 힙 메모리를 프로그램을 사용할 수 있는 자유메모리라고 할 수 있다.프로그램 실행 시에 함수로 내는 데이터 등을 일시적으로 보관해 두는 소량의 메모리와 필요시 언제나 사용할 수 있는 대량의 메모리가 있다. 이때, 소량의 메모리를 ‘스택’이라 하고 대량의 메모리를 ‘힙’ 이라고 한다. 이 ‘힙’이 없어지면 메모리 부족으로 ‘이상종료’를 하게 된다.&lt;/SPAN&gt;&lt;/P&gt;
&lt;P&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;프로세스에 exe 이미지가 로드되고, 할당되고, 이것저것 필요한 동적 라이브러리가 로드되고 사용되지 않는 미사용 구간이 있는 것은 분명한데 그 미사용 영역이 ‘힙’이라고 한다.&amp;nbsp;프로그램을 짤 때 new나 malloc()함수를 이용한 동적 할당을 하게 되면 힙 영역이 사용 가능하도록 되는 것이다. 필요한 메모리 사이즈만큼 OS에게 할당해 달라고 부탁할 수도 있으며, 사용을 다 했으면 다시 OS에게 넘겨줘야한다.&lt;/SPAN&gt;&lt;/P&gt;&lt;FONT face=Arial&gt;(출처 : &lt;A href=&quot;http://mm.sookmyung.ac.kr/%7Em0311087/stack&amp;amp;heap.html&quot;&gt;http://mm.sookmyung.ac.kr/%7Em0311087/stack&amp;amp;heap.html&lt;/A&gt;)&lt;/FONT&gt;&lt;br /&gt;
&lt;br /&gt;&lt;br /&gt;
----------------------------------------------------------------------------------------------------------------&lt;br /&gt;

&lt;P&gt;&lt;B&gt;&lt;FONT face=휴먼엑스포&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;heap&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/B&gt;&lt;br /&gt;
&lt;FONT face=MD아트체&gt;&lt;br /&gt;
heap은 프로그램이 실행될 때까지는 알 수 없는 가변적인 량만큼의 데이터를 저장하기 위해, 프로그램의 프로세스가 사용할 수 있도록 미리 예약되어 있는 메인 메모리의 영역이다. 예를 들면, 하나의 프로그램은 처리를 위해 한 명 이상의 사용자로부터 서로 다른 량의 입력을 받을 수 있으며, 즉시 모든 입력데이터에 대해 처리를 개시한다. 운영체계로부터 이미 확보된 일정량의 heap 저장공간을 가지고 있으면, 저장과 관련된 처리를 좀더 쉽게 할 수 있으며, 일반적으로 필요할 때마다 운영체계에게 매번 저장공간을 요청하는 것보다 빠르다. 프로세스는 필요할 때 heap 블록을 요구하고, 더 이상 필요 없을 때 반환하며, 이따금씩 &quot;자투리모으기&quot;를 수행함으로써 자신에게 할당된 heap을 관리한다. 여기서 자투리모으기란 더 이상 사용되지 않는 블록들을 사용 가능한 상태로 만들고, 또한 heap 내의 사용 가능한 공간을 인지함으로써 사용되지 않은 작은 조각들이 낭비되지 않도록 하는 것을 말한다. &lt;br /&gt;
이 용어는 분명히 다른 용어인 스택(stack)의 영향을 받았다. 스택은 블록들이 저장공간으로부터 어떤 순서에 입각하여 꺼내어지고, 또 같은 방법으로 반환된다는 것을 제외하고는 heap과 비슷하다. 파스칼에서는, subheap은 스택처럼 취급되는 heap의 일부분이다. &lt;br /&gt;
c언어에서 heap에 메모리를 할당할 때는 memory allocation--&amp;gt; malloc()을 사용한다.&lt;br /&gt;
&lt;br /&gt;(출처 : &lt;A href=&quot;http://cafe.naver.com/esw.cafe?iframe_url=/ArticleRead.nhn%3Farticleid=27&quot;&gt;http://cafe.naver.com/esw.cafe?iframe_url=/ArticleRead.nhn%3Farticleid=27&lt;/A&gt;)&lt;br /&gt;
&lt;br /&gt;&lt;br /&gt;
아래 블로그 글도 참조&lt;br /&gt;
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			<category>업그레이드~!!</category>
			<category>heap</category>
			<category>stack</category>
			<author>SamSiKi</author>
			<guid>http://www.samsiki.net/313</guid>
			<comments>http://www.samsiki.net/313#entry313comment</comments>
			<pubDate>Wed, 10 Feb 2010 11:47:13 +0900</pubDate>
		</item>
		<item>
			<title>Speex</title>
			<link>http://www.samsiki.net/312</link>
			<description>WIKIPEDIA&amp;nbsp;펌&amp;nbsp;(&lt;A href=&quot;http://en.wikipedia.org/wiki/Speex&quot;&gt;http://en.wikipedia.org/wiki/Speex&lt;/A&gt;)&lt;br /&gt;
&lt;br /&gt;
&lt;P&gt;&lt;B&gt;Speex&lt;/B&gt; is a patent-free &lt;A title=&quot;Audio compression&quot; href=&quot;http://en.wikipedia.org/wiki/Audio_compression&quot;&gt;&lt;FONT color=#002bb8&gt;audio compression&lt;/FONT&gt;&lt;/A&gt; format designed for speech and also a &lt;A title=&quot;Free software&quot; href=&quot;http://en.wikipedia.org/wiki/Free_software&quot;&gt;&lt;FONT color=#002bb8&gt;free software&lt;/FONT&gt;&lt;/A&gt; &lt;A class=mw-redirect title=&quot;Speech coder&quot; href=&quot;http://en.wikipedia.org/wiki/Speech_coder&quot;&gt;&lt;FONT color=#002bb8&gt;speech codec&lt;/FONT&gt;&lt;/A&gt; that may be used on &lt;A class=mw-redirect title=&quot;Voice over IP&quot; href=&quot;http://en.wikipedia.org/wiki/Voice_over_IP&quot;&gt;&lt;FONT color=#002bb8&gt;VoIP&lt;/FONT&gt;&lt;/A&gt; applications and &lt;A title=Podcast href=&quot;http://en.wikipedia.org/wiki/Podcast&quot;&gt;&lt;FONT color=#002bb8&gt;podcasts&lt;/FONT&gt;&lt;/A&gt;.&lt;SUP class=reference id=cite_ref-4&gt;&lt;A href=&quot;http://en.wikipedia.org/wiki/Speex#cite_note-4&quot;&gt;&lt;FONT color=#5a3696&gt;&lt;SPAN&gt;[&lt;/SPAN&gt;5&lt;SPAN&gt;]&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/A&gt;&lt;/SUP&gt; It is based on the &lt;A title=&quot;Code excited linear prediction&quot; href=&quot;http://en.wikipedia.org/wiki/Code_excited_linear_prediction&quot;&gt;&lt;FONT color=#002bb8&gt;CELP&lt;/FONT&gt;&lt;/A&gt; speech coding algorithm.&lt;SUP class=reference id=cite_ref-celp_5-0&gt;&lt;A href=&quot;http://en.wikipedia.org/wiki/Speex#cite_note-celp-5&quot;&gt;&lt;FONT color=#5a3696&gt;&lt;SPAN&gt;[&lt;/SPAN&gt;6&lt;SPAN&gt;]&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/A&gt;&lt;/SUP&gt; Speex claims to be free of any &lt;A title=&quot;Software patent&quot; href=&quot;http://en.wikipedia.org/wiki/Software_patent&quot;&gt;&lt;FONT color=#002bb8&gt;patent&lt;/FONT&gt;&lt;/A&gt; restrictions and is licensed under the revised (3-clause) &lt;A class=mw-redirect title=&quot;BSD License&quot; href=&quot;http://en.wikipedia.org/wiki/BSD_License&quot;&gt;&lt;FONT color=#002bb8&gt;BSD license&lt;/FONT&gt;&lt;/A&gt;. It may be used with the &lt;A title=Ogg href=&quot;http://en.wikipedia.org/wiki/Ogg&quot;&gt;&lt;FONT color=#002bb8&gt;Ogg&lt;/FONT&gt;&lt;/A&gt; &lt;A title=&quot;Container format&quot; href=&quot;http://en.wikipedia.org/wiki/Container_format&quot;&gt;&lt;FONT color=#002bb8&gt;container format&lt;/FONT&gt;&lt;/A&gt; or directly transmitted over &lt;A title=&quot;User Datagram Protocol&quot; href=&quot;http://en.wikipedia.org/wiki/User_Datagram_Protocol&quot;&gt;&lt;FONT color=#002bb8&gt;UDP&lt;/FONT&gt;&lt;/A&gt;/&lt;A title=&quot;Real-time Transport Protocol&quot; href=&quot;http://en.wikipedia.org/wiki/Real-time_Transport_Protocol&quot;&gt;&lt;FONT color=#002bb8&gt;RTP&lt;/FONT&gt;&lt;/A&gt;.&lt;/P&gt;
&lt;P&gt;The Speex designers see their project as complementary to the &lt;A title=Vorbis href=&quot;http://en.wikipedia.org/wiki/Vorbis&quot;&gt;&lt;FONT color=#002bb8&gt;Vorbis&lt;/FONT&gt;&lt;/A&gt; general-purpose &lt;A title=&quot;Audio compression&quot; href=&quot;http://en.wikipedia.org/wiki/Audio_compression&quot;&gt;&lt;FONT color=#002bb8&gt;audio compression&lt;/FONT&gt;&lt;/A&gt; project.&lt;/P&gt;
&lt;P&gt;Speex is a &lt;A class=mw-redirect title=&quot;Lossy data compression&quot; href=&quot;http://en.wikipedia.org/wiki/Lossy_data_compression&quot;&gt;&lt;FONT color=#002bb8&gt;lossy&lt;/FONT&gt;&lt;/A&gt; format, meaning quality is permanently degraded to reduce file size.&lt;/P&gt;
&lt;P&gt;The Speex project was created on February 13, 2002.&lt;SUP class=reference id=cite_ref-6&gt;&lt;A href=&quot;http://en.wikipedia.org/wiki/Speex#cite_note-6&quot;&gt;&lt;FONT color=#5a3696&gt;&lt;SPAN&gt;[&lt;/SPAN&gt;7&lt;SPAN&gt;]&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/A&gt;&lt;/SUP&gt; The first development versions of Speex were released under &lt;A class=mw-redirect title=LGPL href=&quot;http://en.wikipedia.org/wiki/LGPL&quot;&gt;&lt;FONT color=#002bb8&gt;LGPL&lt;/FONT&gt;&lt;/A&gt; license, but as of version 1.0 beta 1, Speex is released under Xiph&#039;s version of the (revised) BSD license.&lt;SUP class=reference id=cite_ref-7&gt;&lt;A href=&quot;http://en.wikipedia.org/wiki/Speex#cite_note-7&quot;&gt;&lt;FONT color=#5a3696&gt;&lt;SPAN&gt;[&lt;/SPAN&gt;8&lt;SPAN&gt;]&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/A&gt;&lt;/SUP&gt; Speex 1.0 was announced on March 24, 2003, after a year of development.&lt;SUP class=reference id=cite_ref-release1_0_8-0&gt;&lt;A href=&quot;http://en.wikipedia.org/wiki/Speex#cite_note-release1_0-8&quot;&gt;&lt;FONT color=#5a3696&gt;&lt;SPAN&gt;[&lt;/SPAN&gt;9&lt;SPAN&gt;]&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/A&gt;&lt;/SUP&gt; The last stable version of Speex encoder and decoder is 1.1.12.&lt;SUP class=reference id=cite_ref-news_1-1&gt;&lt;A href=&quot;http://en.wikipedia.org/wiki/Speex#cite_note-news-1&quot;&gt;&lt;FONT color=#5a3696&gt;&lt;SPAN&gt;[&lt;/SPAN&gt;2&lt;SPAN&gt;]&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/A&gt;&lt;/SUP&gt;&lt;/P&gt;
&lt;P&gt;&lt;SUP&gt;&lt;/SUP&gt;&amp;nbsp;&lt;/P&gt;&lt;U&gt;&lt;STRONG&gt;&lt;SPAN style=&quot;FONT-SIZE: 12pt&quot;&gt;Description&lt;/SPAN&gt;&lt;/STRONG&gt;&lt;/U&gt;&lt;br /&gt;

&lt;P&gt;Unlike many other speech codecs, Speex is not targeted at cellular telephony but rather at &lt;A class=mw-redirect title=&quot;Voice over IP&quot; href=&quot;http://en.wikipedia.org/wiki/Voice_over_IP&quot;&gt;&lt;FONT color=#002bb8&gt;Voice over IP&lt;/FONT&gt;&lt;/A&gt; (VoIP) and file-based compression. The design goals have been to make a codec that would be optimized for high quality speech and low bit rate. To achieve this the codec uses multiple bit rates, and supports ultra-wideband (32&amp;nbsp;&lt;A class=mw-redirect title=KHz href=&quot;http://en.wikipedia.org/wiki/KHz&quot;&gt;&lt;FONT color=#002bb8&gt;kHz&lt;/FONT&gt;&lt;/A&gt; &lt;A title=&quot;Sampling rate&quot; href=&quot;http://en.wikipedia.org/wiki/Sampling_rate&quot;&gt;&lt;FONT color=#002bb8&gt;sampling rate&lt;/FONT&gt;&lt;/A&gt;), &lt;A title=Wideband href=&quot;http://en.wikipedia.org/wiki/Wideband&quot;&gt;&lt;FONT color=#002bb8&gt;wideband&lt;/FONT&gt;&lt;/A&gt; (16&amp;nbsp;kHz sampling rate) and narrowband (telephone quality, 8&amp;nbsp;kHz sampling rate). Since Speex was designed for Voice over IP (&lt;A class=mw-redirect title=VoIP href=&quot;http://en.wikipedia.org/wiki/VoIP&quot;&gt;&lt;FONT color=#002bb8&gt;VoIP&lt;/FONT&gt;&lt;/A&gt;) instead of cell phone use, the codec must be robust to lost packets, but not to corrupted ones. All this led to the choice of &lt;A class=mw-redirect title=&quot;Code Excited Linear Prediction&quot; href=&quot;http://en.wikipedia.org/wiki/Code_Excited_Linear_Prediction&quot;&gt;&lt;FONT color=#002bb8&gt;Code Excited Linear Prediction&lt;/FONT&gt;&lt;/A&gt; (CELP) as the encoding technique to use for Speex.&lt;SUP class=reference id=cite_ref-celp_5-1&gt;&lt;A href=&quot;http://en.wikipedia.org/wiki/Speex#cite_note-celp-5&quot;&gt;&lt;FONT color=#5a3696&gt;&lt;SPAN&gt;[&lt;/SPAN&gt;6&lt;SPAN&gt;]&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/A&gt;&lt;/SUP&gt; One of the main reasons is that CELP has long proven that it could do the job and scale well to both low &lt;A title=&quot;Bit rate&quot; href=&quot;http://en.wikipedia.org/wiki/Bit_rate&quot;&gt;&lt;FONT color=#002bb8&gt;bit rates&lt;/FONT&gt;&lt;/A&gt; (as evidenced by DoD CELP @ 4.8&amp;nbsp;kbit/s) and high bit rates (as with &lt;A title=G.728 href=&quot;http://en.wikipedia.org/wiki/G.728&quot;&gt;&lt;FONT color=#002bb8&gt;G.728&lt;/FONT&gt;&lt;/A&gt; @ 16&amp;nbsp;kbit/s). The main characteristics can be summarized as follows:&lt;/P&gt;
&lt;UL&gt;
&lt;LI&gt;&lt;A title=&quot;Free software&quot; href=&quot;http://en.wikipedia.org/wiki/Free_software&quot;&gt;&lt;FONT color=#002bb8&gt;Free software&lt;/FONT&gt;&lt;/A&gt;/open-source, &lt;A title=Patent href=&quot;http://en.wikipedia.org/wiki/Patent&quot;&gt;&lt;FONT color=#002bb8&gt;patent&lt;/FONT&gt;&lt;/A&gt; and &lt;A title=Royalties href=&quot;http://en.wikipedia.org/wiki/Royalties&quot;&gt;&lt;FONT color=#002bb8&gt;royalty&lt;/FONT&gt;&lt;/A&gt;-free 
&lt;LI&gt;Integration of narrowband and wideband in the same bit-stream 
&lt;LI&gt;Wide range of bit rates available (from 2&amp;nbsp;kbit/s to 44&amp;nbsp;kbit/s) 
&lt;LI&gt;Dynamic bit rate switching and &lt;A class=mw-redirect title=&quot;Variable bit-rate&quot; href=&quot;http://en.wikipedia.org/wiki/Variable_bit-rate&quot;&gt;&lt;FONT color=#002bb8&gt;Variable bit-rate&lt;/FONT&gt;&lt;/A&gt; (VBR) 
&lt;LI&gt;Voice Activity Detection (VAD, integrated with VBR) (not working from version 1.2) 
&lt;LI&gt;Variable complexity 
&lt;LI&gt;Ultra-wideband mode at 32&amp;nbsp;kHz (up to 48&amp;nbsp;kHz) 
&lt;LI&gt;&lt;A title=&quot;Intensity stereo&quot; href=&quot;http://en.wikipedia.org/wiki/Intensity_stereo&quot;&gt;&lt;FONT color=#002bb8&gt;Intensity stereo&lt;/FONT&gt;&lt;/A&gt; encoding option &lt;/LI&gt;&lt;/UL&gt;&lt;br /&gt;
이만큼의 내용을 해석하여 써놨군요. 아래파일을 참조~&lt;br /&gt;
&lt;br /&gt;&lt;div class=&quot;imageblock center&quot; style=&quot;text-align: center; clear: both;&quot;&gt;&lt;a href=&quot;http://cfile8.uf.tistory.com/original/1249D01B4B6A115B2C494A&quot; rel=&quot;lightbox&quot; target=&quot;_blank&quot;&gt;&lt;img src=&quot;http://cfile8.uf.tistory.com/image/1249D01B4B6A115B2C494A&quot; alt=&quot;&quot; filemime=&quot;image/jpeg&quot; filename=&quot;speex.jpg&quot; height=&quot;441&quot; width=&quot;600&quot;/&gt;&lt;/a&gt;&lt;/div&gt;&lt;br /&gt;
(출처 : &lt;A href=&quot;http://cafe.naver.com/develx.cafe?iframe_url=/ArticleRead.nhn%3Farticleid=124&quot;&gt;http://cafe.naver.com/develx.cafe?iframe_url=/ArticleRead.nhn%3Farticleid=124&lt;/A&gt;)&lt;br /&gt;
&lt;br /&gt;&lt;br /&gt;
&lt;STRONG&gt;&lt;U&gt;&lt;SPAN style=&quot;FONT-SIZE: 12pt&quot;&gt;Feature&lt;/SPAN&gt;&lt;/U&gt;&lt;/STRONG&gt;&lt;br /&gt;

&lt;DT&gt;&amp;nbsp;
&lt;DT&gt;Sampling rate 
&lt;DD&gt;Speex is mainly designed for three different sampling rates: 8&amp;nbsp;kHz (the same sampling rate to transmit &lt;A title=Telephone href=&quot;http://en.wikipedia.org/wiki/Telephone&quot;&gt;&lt;FONT color=#002bb8&gt;telephone&lt;/FONT&gt;&lt;/A&gt; calls), 16&amp;nbsp;kHz, and 32&amp;nbsp;kHz. These are respectively referred to as narrowband, wideband and ultra-wideband. 
&lt;DT&gt;Quality 
&lt;DD&gt;Speex encoding is controlled most of the time by a quality parameter that ranges from 0 to 10. In constant bit-rate (CBR) operation, the quality parameter is an &lt;A title=Integer href=&quot;http://en.wikipedia.org/wiki/Integer&quot;&gt;&lt;FONT color=#002bb8&gt;integer&lt;/FONT&gt;&lt;/A&gt;, while for variable bit-rate (VBR), the parameter is a real (&lt;A title=&quot;Floating point&quot; href=&quot;http://en.wikipedia.org/wiki/Floating_point&quot;&gt;&lt;FONT color=#002bb8&gt;floating point&lt;/FONT&gt;&lt;/A&gt;) number. 
&lt;DT&gt;Complexity (variable) 
&lt;DD&gt;With Speex, it is possible to vary the complexity allowed for the encoder. This is done by controlling how the search is performed with an integer ranging from 1 to 10 in a way similar to the -1 to -9 options to &lt;A title=Gzip href=&quot;http://en.wikipedia.org/wiki/Gzip&quot;&gt;&lt;FONT color=#002bb8&gt;gzip&lt;/FONT&gt;&lt;/A&gt; &lt;A title=&quot;Data compression&quot; href=&quot;http://en.wikipedia.org/wiki/Data_compression&quot;&gt;&lt;FONT color=#002bb8&gt;compression&lt;/FONT&gt;&lt;/A&gt; utilities. For normal use, the noise level at complexity 1 is between 1 and 2&amp;nbsp;dB higher than at complexity 10, but the &lt;A title=&quot;Central processing unit&quot; href=&quot;http://en.wikipedia.org/wiki/Central_processing_unit&quot;&gt;&lt;FONT color=#002bb8&gt;CPU&lt;/FONT&gt;&lt;/A&gt; requirements for complexity 10 is about five times higher than for complexity 1. In practice, the best trade-off is between complexity 2 and 4&lt;SUP class=reference id=cite_ref-9&gt;&lt;A href=&quot;http://en.wikipedia.org/wiki/Speex#cite_note-9&quot;&gt;&lt;FONT color=#5a3696&gt;&lt;SPAN&gt;[&lt;/SPAN&gt;10&lt;SPAN&gt;]&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/A&gt;&lt;/SUP&gt;, though higher settings are often useful when encoding non-speech sounds like &lt;A class=mw-redirect title=DTMF href=&quot;http://en.wikipedia.org/wiki/DTMF&quot;&gt;&lt;FONT color=#002bb8&gt;DTMF&lt;/FONT&gt;&lt;/A&gt; tones, or if encoding is not in real-time. 
&lt;DT&gt;&lt;A title=&quot;Variable bitrate&quot; href=&quot;http://en.wikipedia.org/wiki/Variable_bitrate&quot;&gt;&lt;FONT color=#002bb8&gt;Variable Bit-Rate (VBR)&lt;/FONT&gt;&lt;/A&gt; 
&lt;DD&gt;Variable bit-rate (VBR) allows a codec to change its bit rate dynamically to adapt to the &quot;difficulty&quot; of the audio being encoded. In the example of Speex, sounds like &lt;A title=Vowel href=&quot;http://en.wikipedia.org/wiki/Vowel&quot;&gt;&lt;FONT color=#002bb8&gt;vowels&lt;/FONT&gt;&lt;/A&gt; and high-energy &lt;A title=&quot;Transient (acoustics)&quot; href=&quot;http://en.wikipedia.org/wiki/Transient_(acoustics)&quot;&gt;&lt;FONT color=#002bb8&gt;transients&lt;/FONT&gt;&lt;/A&gt; require a higher bit rate to achieve good quality, while &lt;A class=mw-redirect title=Fricative href=&quot;http://en.wikipedia.org/wiki/Fricative&quot;&gt;&lt;FONT color=#002bb8&gt;fricatives&lt;/FONT&gt;&lt;/A&gt; (e.g. s and f sounds) can be coded adequately with fewer bits. For this reason, VBR can achieve lower bit rate for the same quality, or a better quality for a certain bit rate. Despite its advantages, VBR has three main drawbacks: first, by only specifying quality, there is no guarantee about the final average bit-rate. Second, for some real-time applications like &lt;A class=mw-redirect title=&quot;Voice over IP&quot; href=&quot;http://en.wikipedia.org/wiki/Voice_over_IP&quot;&gt;&lt;FONT color=#002bb8&gt;voice over IP&lt;/FONT&gt;&lt;/A&gt; (VoIP), what counts is the maximum bit-rate, which must be low enough for the communication channel. Third, encryption of VBR-encoded speech may not ensure complete privacy, as phrases can still be identified, at least in a controlled setting with a small dictionary of phrases&lt;SUP class=reference id=cite_ref-10&gt;&lt;A href=&quot;http://en.wikipedia.org/wiki/Speex#cite_note-10&quot;&gt;&lt;FONT color=#5a3696&gt;&lt;SPAN&gt;[&lt;/SPAN&gt;11&lt;SPAN&gt;]&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/A&gt;&lt;/SUP&gt;, by analysing the pattern of variation of the bit rate. 
&lt;DT&gt;Average Bit-Rate (ABR) 
&lt;DD&gt;Average bit-rate solves one of the problems of VBR, as it dynamically adjusts VBR quality in order to meet a specific target bit-rate. Because the quality/bit-rate is adjusted in real-time (open-loop), the global quality will be slightly lower than that obtained by encoding in VBR with exactly the right quality setting to meet the target average bitrate. 
&lt;DT&gt;Voice Activity Detection (VAD) 
&lt;DD&gt;When enabled, voice activity detection detects whether the audio being encoded is speech or silence/background noise. VAD is always implicitly activated when encoding in VBR, so the option is only useful in non-VBR operation. In this case, Speex detects non-speech periods and encodes them with just enough bits to reproduce the background noise. This is called &quot;&lt;A title=&quot;Comfort noise&quot; href=&quot;http://en.wikipedia.org/wiki/Comfort_noise&quot;&gt;&lt;FONT color=#002bb8&gt;comfort noise&lt;/FONT&gt;&lt;/A&gt; generation&quot; (CNG). Last version VAD was working fine is 1.1.12, since v 2.1 it has been replaced with simple Any Activity Detection. 
&lt;DT&gt;Discontinuous Transmission (DTX) 
&lt;DD&gt;Discontinuous transmission is an addition to VAD/VBR operation, that allows to stop transmitting completely when the background noise is stationary. In a file, 5 bits are used for each missing frame (corresponding to 250&amp;nbsp;bit/s). 
&lt;DT&gt;Perceptual enhancement 
&lt;DD&gt;Perceptual enhancement is a part of the decoder which, when turned on, tries to reduce (the perception of) the noise produced by the coding/decoding process. In most cases, perceptual enhancement makes the sound further from the original objectively (signal-to-noise ratio), but in the end it still sounds better (subjective improvement). 
&lt;DT&gt;Algorithmic delay 
&lt;DD&gt;Every codec introduces a delay in the transmission. For Speex, this delay is equal to the frame size, plus some amount of &quot;look-ahead&quot; required to process each frame. In narrowband operation (8&amp;nbsp;kHz), the delay is 30&amp;nbsp;ms, while for wideband (16&amp;nbsp;kHz), the delay is 34&amp;nbsp;ms. These values don&#039;t account for the CPU time it takes to encode or decode the frames. &lt;/DD&gt;&lt;div class=&quot;entry-ccl&quot; style=&quot;clear: both; text-align: right; margin-bottom: 10px&quot;&gt;
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			<category>잡동사니</category>
			<category>Codec</category>
			<category>speex</category>
			<author>SamSiKi</author>
			<guid>http://www.samsiki.net/312</guid>
			<comments>http://www.samsiki.net/312#entry312comment</comments>
			<pubDate>Thu, 04 Feb 2010 09:20:14 +0900</pubDate>
		</item>
		<item>
			<title>날 살찌게 하는것들..</title>
			<link>http://www.samsiki.net/311</link>
			<description>&lt;div class=&quot;imageblock center&quot; style=&quot;text-align: center; clear: both;&quot;&gt;&lt;a href=&quot;http://cfile3.uf.tistory.com/original/1616801A4B694BF517513B&quot; rel=&quot;lightbox&quot; target=&quot;_blank&quot;&gt;&lt;img src=&quot;http://cfile3.uf.tistory.com/image/1616801A4B694BF517513B&quot; alt=&quot;&quot; filemime=&quot;&quot; filename=&quot;cfile3.uf@1616801A4B694BF517513B.jpg&quot; height=&quot;450&quot; width=&quot;600&quot;/&gt;&lt;/a&gt;&lt;p class=&quot;cap1&quot;&gt;큼직한 소시지 ㅋ&lt;/p&gt;&lt;/div&gt;&lt;br /&gt;
&lt;div class=&quot;imageblock center&quot; style=&quot;text-align: center; clear: both;&quot;&gt;&lt;a href=&quot;http://cfile10.uf.tistory.com/original/1916801A4B694BF7182771&quot; rel=&quot;lightbox&quot; target=&quot;_blank&quot;&gt;&lt;img src=&quot;http://cfile10.uf.tistory.com/image/1916801A4B694BF7182771&quot; alt=&quot;&quot; filemime=&quot;&quot; filename=&quot;cfile10.uf@1916801A4B694BF7182771.jpg&quot; height=&quot;450&quot; width=&quot;600&quot;/&gt;&lt;/a&gt;&lt;p class=&quot;cap1&quot;&gt;치즈와 살라미&lt;/p&gt;&lt;/div&gt;&lt;br /&gt;
&lt;div class=&quot;imageblock center&quot; style=&quot;text-align: center; clear: both;&quot;&gt;&lt;a href=&quot;http://cfile24.uf.tistory.com/original/1216801A4B694BF91980BE&quot; rel=&quot;lightbox&quot; target=&quot;_blank&quot;&gt;&lt;img src=&quot;http://cfile24.uf.tistory.com/image/1216801A4B694BF91980BE&quot; alt=&quot;&quot; filemime=&quot;&quot; filename=&quot;cfile24.uf@1216801A4B694BF91980BE.jpg&quot; height=&quot;450&quot; width=&quot;600&quot;/&gt;&lt;/a&gt;&lt;p class=&quot;cap1&quot;&gt;컨셉을 알수없는 내부ㅎㅎ&lt;/p&gt;&lt;/div&gt;&lt;br /&gt;
버거살룬에 가면 맛난것들이 많다..&lt;br /&gt;
&lt;br /&gt;이곳에 간 이후로 3kg이 쪘다는 ㅠ_ㅠ&lt;br /&gt;&lt;div class=&quot;entry-ccl&quot; style=&quot;clear: both; text-align: right; margin-bottom: 10px&quot;&gt;
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			<category>☞ 끄적끄적 ☜</category>
			<category>버거살룬</category>
			<category>소시지</category>
			<category>치즈</category>
			<author>SamSiKi</author>
			<guid>http://www.samsiki.net/311</guid>
			<comments>http://www.samsiki.net/311#entry311comment</comments>
			<pubDate>Wed, 03 Feb 2010 19:13:56 +0900</pubDate>
		</item>
		<item>
			<title>버거살룬 버거~!</title>
			<link>http://www.samsiki.net/310</link>
			<description>&lt;div class=&quot;imageblock center&quot; style=&quot;text-align: center; clear: both;&quot;&gt;&lt;a href=&quot;http://cfile2.uf.tistory.com/original/1323C11A4B661E4065EB6A&quot; rel=&quot;lightbox&quot; target=&quot;_blank&quot;&gt;&lt;img src=&quot;http://cfile2.uf.tistory.com/image/1323C11A4B661E4065EB6A&quot; alt=&quot;&quot; filemime=&quot;image/jpeg&quot; filename=&quot;,,,.jpg&quot; height=&quot;450&quot; width=&quot;600&quot;/&gt;&lt;/a&gt;&lt;/div&gt;&lt;br /&gt;
&lt;br /&gt;모든 버거가 맛있다..&lt;div class=&quot;entry-ccl&quot; style=&quot;clear: both; text-align: right; margin-bottom: 10px&quot;&gt;
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			<category>☞ 끄적끄적 ☜</category>
			<category>버거살룬</category>
			<author>SamSiKi</author>
			<guid>http://www.samsiki.net/310</guid>
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			<pubDate>Sun, 31 Jan 2010 19:15:34 +0900</pubDate>
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