Signal Processing & DSP

Intermediate

Frequency Resolution

Spacing between adjacent FFT bins.

Formula

\Delta f = \frac{f_s}{N}

Live Calculator

Members

Variables

ΔfResolution (Hz)

f_sSampling rate

NFFT size

Example

f_s=44100, N=4096: Δf ≈ 10.8 Hz

Did You Know?

Finer frequency resolution needs a longer analysis window — the classic time-frequency trade-off.

dsp fft resolution

Share this formula

More in Signal Processing & DSP

Nyquist Rate

Sample at least twice the highest frequency to avoid aliasing.

FFT Bin Frequency

Frequency represented by the k-th bin of an N-point FFT.

Signal-to-Noise Ratio

Ratio of signal power to noise power, in decibels.

Quantisation SNR

Best possible SNR (dB) of an ideal b-bit converter.

Decibel (Power Ratio)

Express a power ratio in decibels.

Decibel (Amplitude Ratio)

Express a voltage/amplitude ratio in decibels.