Free · No login required
Log Sweep Timing
Locate a target frequency within a logarithmic sine sweep and find its time per octave.
Start frequency (Hz): 1–96000; End frequency (Hz): 1–96000; Sweep duration (s): 0.001–3600; Target frequency (Hz): 1–96000
Inputs stay on this page and clear on refresh.
Log Sweep Timing
Start frequency (Hz): 100 End frequency (Hz): 1600 Sweep duration (s): 8 Target frequency (Hz): 400
- Target elapsed time (s)
- 4.000000
- Time per octave (s)
- 2.000000
For a purely logarithmic sweep f(t)=f₀ × (f₁/f₀)^(t/T), target time = T × ln(f/f₀)/ln(f₁/f₀); time per octave = T × ln(2)/|ln(f₁/f₀)|. Use different endpoints and a target between them, inclusive. Ascending and descending sweeps are supported. Time starts at the first frequency; exclude pre-roll, fades, latency and reverberation tails. This does not generate audio or predict an impulse response. Octave time is a rate and may exceed T for a span smaller than one octave.
Methodology
How it works
For a purely logarithmic sweep f(t)=f₀ × (f₁/f₀)^(t/T), target time = T × ln(f/f₀)/ln(f₁/f₀); time per octave = T × ln(2)/|ln(f₁/f₀)|. Use different endpoints and a target between them, inclusive. Ascending and descending sweeps are supported. Time starts at the first frequency; exclude pre-roll, fades, latency and reverberation tails. This does not generate audio or predict an impulse response. Octave time is a rate and may exceed T for a span smaller than one octave.
Method and assumptions documented by Techrider.live
2026-11-13
Frequently asked questions
Is this the timing of every measurement application?
No. Some applications extend the sweep range or add fades, silence and timing references. Use the actual logarithmic segment endpoints and duration, not the whole recording length.