dB (Power Ratio)
dB = 10 × log₁₀(P₂/P₁)
Decibel representation of a power ratio on a logarithmic scale.
dB (Voltage Ratio)
dBV = 20 × log₁₀(V₂/V₁)
Decibel representation of a voltage ratio.
Frequency Resolution
fᵣₑₛ = fₛ / N
Smallest frequency bin in an FFT given sample rate and frame size.
Nyquist Sampling
fₛ ≥ 2 × fₘₐₓ
Minimum sample rate required to reconstruct a signal without aliasing.