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Fundamental RMS

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Introduction
Β 

μ •μ˜

μ‹ ν˜Έμ—μ„œ κΈ°λ³Έ 주파수 μ„±λΆ„λ§Œ λΆ„λ¦¬ν–ˆμ„ λ•Œ, κ·Έ μ„±λΆ„μ˜ μ‹€νš¨κ°’
πŸ“„
Root Mean Square - RMS
이닀.

μ„€λͺ…

Fundamental RMSλŠ” 전체 μ‹ ν˜Έμ˜ 크기가 μ•„λ‹ˆλΌ,
πŸ“„
Fundamental Frequency - F0 (기본 주파수)
ν•˜λ‚˜κ°€ μ°¨μ§€ν•˜λŠ” μ—λ„ˆμ§€ μˆ˜μ€€μ„ μ •λŸ‰ν™”ν•œλ‹€.
μ‹€μ œ μ‹ ν˜Έμ—λŠ” 기본주파수 외에도
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Overtone (μƒμŒ)
,
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Noise (작음)
,
πŸ“„
Distortion (μ™œκ³‘)
성뢄이 ν•¨κ»˜ μ‘΄μž¬ν•œλ‹€.
일반 RMSλŠ” 이 λͺ¨λ“  성뢄을 포함해 κ³„μ‚°λ˜μ§€λ§Œ, Fundamental RMSλŠ” μŠ€νŽ™νŠΈλŸΌ λΆ„μ„μ΄λ‚˜ 필터링을 톡해 κΈ°λ³Έ μ„±λΆ„λ§Œ μΆ”μΆœν•œ λ’€ RMSλ₯Ό κ΅¬ν•œλ‹€.
이 μ§€ν‘œλŠ” μ‹ ν˜Έμ˜ 핡심 μ—λ„ˆμ§€κ°€ μ–Όλ§ˆλ‚˜ μ•ˆμ •μ μœΌλ‘œ μœ μ§€λ˜λŠ”μ§€λ₯Ό ν‰κ°€ν•˜λŠ” 데 μœ μš©ν•˜λ©°,
πŸ“„
Distortion (μ™œκ³‘)
뢄석과 레벨 λΉ„κ΅μ˜ κΈ°μ€€μœΌλ‘œ 자주 μ‚¬μš©λœλ‹€.

원리

Fundamental RMS의 μ›λ¦¬λŠ” μ£ΌκΈ° μ‹ ν˜Έμ˜ μ—λ„ˆμ§€λ₯Ό ꡬ쑰적으둜 λΆ„ν•΄ν•΄ ν‰κ°€ν•˜λ©΄, λΉ„μ„ ν˜•μ„±κ³Ό λ³€μ‘° 영ν–₯을 더 μ •ν™•νžˆ ꡬ뢄할 수 μžˆλ‹€λŠ” 점에 μžˆλ‹€.
Β 
  1. μ‹ ν˜ΈλŠ” 합성물이닀.
    1. λͺ¨λ“  μ‹ ν˜ΈλŠ” 기본주파수 μ„±λΆ„, 고쑰파 μ„±λΆ„, λΉ„μ£ΌκΈ° μ„±λΆ„(
      πŸ“„
      Noise (작음)
      ,
      πŸ“„
      Jitter
      , 랜덀 λ³€ν™”)의 ν•©μœΌλ‘œ ν‘œν˜„λœλ‹€. 전체 RMSλŠ” 이듀을 κ΅¬λΆ„ν•˜μ§€ μ•ŠλŠ”λ‹€. Fundamental RMSλŠ” 이 쀑 κΈ°λ³Έ μ„±λΆ„λ§Œμ„ μ—λ„ˆμ§€ 계산 λŒ€μƒμœΌλ‘œ μ„ νƒν•œλ‹€.
  1. κΈ°λ³Έ μ£ΌνŒŒμˆ˜λŠ” 지각과 κΈ°λŠ₯의 기쀀좕이닀.
    1. λ§Žμ€ μ‹œμŠ€ν…œμ—μ„œ μ‹ ν˜Έμ˜ μ˜λ―ΈλŠ” κΈ°λ³Έμ£ΌνŒŒμˆ˜μ— μ˜ν•΄ μ •μ˜λœλ‹€. μ£ΌκΈ°μ„±, 동기화, 캐리어 μ•ˆμ •μ„±, μŒλ†’μ΄ 인식 같은 μš”μ†ŒλŠ” κΈ°λ³Έ 성뢄에 μ˜μ‘΄ν•œλ‹€.
      Fundamental RMSλŠ” 이 κΈ°μ€€μΆ•μ˜ μ—λ„ˆμ§€κ°€ μ–Όλ§ˆλ‚˜ μΌκ΄€λ˜κ²Œ μœ μ§€λ˜λŠ”μ§€λ₯Ό μˆ˜μΉ˜ν™”ν•œλ‹€.
  1. μ™œκ³‘κ³Ό λ ˆλ²¨μ„ λΆ„λ¦¬ν•œλ‹€.
    1. λΉ„μ„ ν˜• μ‹œμŠ€ν…œμ—μ„œλŠ” 좜λ ₯ RMSκ°€ 증가해도, κ·Έ 증가뢄이 κΈ°λ³Έ 성뢄이 μ•„λ‹ˆλΌ 배음 μ¦κ°€μ—μ„œ μ˜€λŠ” κ²½μš°κ°€ λ§Žλ‹€.
      Fundamental RMSλ₯Ό 보면 레벨이 컀진 것인지, μ™œκ³‘μ΄ λŠ˜μ–΄λ‚œ 것인지λ₯Ό 뢄리해 νŒλ‹¨ν•  수 μžˆλ‹€.
  1. μ—λ„ˆμ§€ 보쑴 관점
    1. RMSλŠ” μ—λ„ˆμ§€ 평균값이기 λ•Œλ¬Έμ—, 전체 RMS μ œκ³±μ€ 각 μ„±λΆ„ RMS 제곱의 ν•©μœΌλ‘œ ν‘œν˜„λœλ‹€.
      이 ꡬ쑰 덕뢄에 Fundamental RMSλŠ” 전체 μ—λ„ˆμ§€ 쀑 κΈ°λ³Έ 성뢄이 μ°¨μ§€ν•˜λŠ” λΉ„μœ¨μ„ μ •λŸ‰μ μœΌλ‘œ λ“œλŸ¬λ‚Έλ‹€.
  1. 주파수 μ•ˆμ •μ„±μ˜ μ§€ν‘œ
    1. κΈ°λ³Έ 성뢄이 흔듀리면 RMS 값도 λ³€ν•œλ‹€. 이 λ³€ν™”λŠ” λ³€μ‘°, μ§€ν„°,
      πŸ“„
      Phase - Ο† (μœ„μƒ)
      λΆˆμ•ˆμ •μ˜ κ°„μ ‘ μ§€ν‘œκ°€ λœλ‹€.
      λ”°λΌμ„œ Fundamental RMSλŠ” λ‹¨μˆœ 레벨 μ§€ν‘œκ°€ μ•„λ‹Œ, μ•ˆμ •μ„± μ§€ν‘œλ‘œλ„ κ°€λŠ₯ν•˜λ‹€.
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ꡬ쑰

μ‹ ν˜Έ λΆ„ν•΄

x(t) = x₁(t) + x_h(t) + n(t)

기본주파수 μ„±λΆ„

x₁(t) = A Β· sin(2Ο€fβ‚€t + Ο†)

Fundamental RMS

RMS_fund = √( (1/T) Β· ∫ x₁²(t) dt )

μ˜ˆμ‹œ

μ™œκ³‘ λΆ„μ„μ—μ„œμ˜ κΈ°μ€€μΆ•

  • πŸ“„
    Total Harmonic Distortion - THD
    계산은 고쑰파 μ—λ„ˆμ§€λ₯Ό κΈ°λ³Έ μ„±λΆ„ μ—λ„ˆμ§€λ‘œ λ‚˜λˆˆ 값이닀. 이 λ•Œ λΆ„λͺ¨κ°€ λ˜λŠ” 값이 Fundamental RMSλ‹€. κΈ°λ³Έ RMSκ°€ μ•ˆμ •μ μΌμˆ˜λ‘ μ™œκ³‘ μˆ˜μΉ˜λŠ” 의미λ₯Ό κ°€μ§„λ‹€.

레벨 λΉ„κ΅μ˜ μ°©μ‹œ 제거

  • 두 μ‹ ν˜Έμ˜ 전체 RMSκ°€ 같아도, ν•œμͺ½μ€ κΈ°λ³Έ 성뢄이 κ°•ν•˜κ³ , λ‹€λ₯Έ μͺ½μ€ 배음과 작음이 λ§Žμ„ 수 μžˆλ‹€. Fundamental RMSλ₯Ό 보면 μ‹€μ œ 핡심 μ—λ„ˆμ§€κ°€ 같은지 λ°”λ‘œ λ“œλŸ¬λ‚œλ‹€.

μ‹œμŠ€ν…œ μ„ ν˜•μ„± 평가

  • μž…λ ₯ λ ˆλ²¨μ„ μ˜¬λ Έμ„ λ•Œ Fundamental RMSκ°€ λΉ„λ‘€ν•΄ μ¦κ°€ν•˜μ§€ μ•ŠμœΌλ©΄, μ‹œμŠ€ν…œμ€ μ„ ν˜• μ˜μ—­μ„ λ²—μ–΄λ‚œ 것이닀. 전체 RMS만 보면 이 지점을 λ†“μΉ˜κΈ° 쉽닀.

톡신, μ œμ–΄ μ‹ ν˜Έ μ•ˆμ •μ„±

  • 캐리어 기반 μ‹œμŠ€ν…œμ—μ„œ κΈ°λ³Έ μ„±λΆ„ RMSλŠ” 전솑 ν’ˆμ§ˆκ³Ό μ§κ²°λœλ‹€. μž‘μŒμ΄λ‚˜ λ³€μ‘°κ°€ 증가해도 κΈ°λ³Έ RMSκ°€ μœ μ§€λ˜λŠ”μ§€ μ—¬λΆ€κ°€ 핡심 νŒλ‹¨ 기쀀이 λœλ‹€.

μ‹œκ°„ λ³€ν™” 좔적

  • μ‹œκ°„μ— 따라 Fundamental RMSλ₯Ό μΆ”μ ν•˜λ©΄ λ³€μ‘° 깊이, 레벨 νŽŒν•‘, μ£ΌκΈ° λΆˆμ•ˆμ • 같은 ν˜„μƒμ΄ 수치둜 λ“œλŸ¬λ‚œλ‹€. μ΄λŠ” νŒŒν˜• 관찰보닀 ꡬ쑰적이닀.

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