Calculadora de Ruído de Quantização — Formula

Signal-to-Noise Ratio

SNR compares the level of a desired signal to the background noise level. Higher SNR means a cleaner signal.

Formula

SNR (dB) = 10 x log10(P_signal / P_noise)

For voltage measurements: SNR (dB) = 20 x log10(V_signal / V_noise)

Reference Points

  • 60+ dB: Excellent (hi-fi audio)
  • 40-60 dB: Good (voice communication)
  • 20-40 dB: Fair (some degradation)
  • < 20 dB: Poor (significant noise)

    • Exemplo Resolvido

    Signal power of 100 mW with noise power of 0.1 mW.

    1. SNR linear: 100 / 0.1 = 1000
    2. SNR dB: 10 x log10(1000) = 30.0 dB
    3. Noise fraction: 0.1 / 100 x 100 = 0.1%