量化噪声计算器 — 公式
## 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)
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)
计算示例
Signal power of 100 mW with noise power of 0.1 mW.
- SNR linear: 100 / 0.1 = 1000
- SNR dB: 10 x log10(1000) = 30.0 dB
- Noise fraction: 0.1 / 100 x 100 = 0.1%