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제목 음악 파일에서의 bit 와 KHz의 의미 관리자
Hit: 984 2017-07-26

4비트(bit)와 192킬로헤르츠(kHz)
192킬로헤르츠(kHz)는 1초라는 시간에 몇 번을 끊느냐라는 부분이다. 
 

192kHz는 1초당 192,000번을 끊는다는 것을 의미한다.  

디지털 음원은 수 많은 점이 연결되어 하나의 선처럼 연결이 되는데, 1초에 192,000개의 점으로  

신호가 구성되어 있다.  

이를 샘플링 레이트(sampling rate)라고 한다.
24비트(bit)는 192,000개의 신호 각각에 담긴 0과 1의 신호가 2의 24제곱 단계로 
 

기록되는 것이다.
샘플링 레이트(sampling rate)는 해상력과 정보력이 관계되며 얼마나 
 

많은 정보가 담기느냐를 의미하며, 비트 레이트(bit rate)는 다이내믹 레인지(dynamic range)에  

관계되고 음의 높낮이로 최강음과 최약음이 오고 가는 변화를 얼마나 충실히 구현하느냐를 의미한다.  

샘플링 레이트와 비트 레이트가 높을수록 손실이 없고  

원음에 가까운 소리를 듣게 되는 것이다.
MP3와 CD의 주파수분석 (10kHz 대역)을 비교해보면 CD가 MP3파일에 비하여 
 

원 주파수 이외의 NOISE가 작게 발생하는 것을 확인할 수 있다.  

CD와 24bit 음원을 동일한 조건에서 테스트 해보면  

그 차이는 더욱 커져서 24bit의 노이즈는 CD대비 제로(O)에 가깝다.
 

이전글 노블 LCR 포노앰프 곡선 RIAA ffrr Reproduction curve
다음글 음악이 아닌 엉뜽한 정보를 공유하겠습니다.

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