f0ac

This function implements a F0 detection algorithm using autocorrelation, as described by Paul Boersma (1993: Accurate Short-Term Analysis of the Fundamental Frequency and the Harmonics-To-Noise Ratio of a Sampled Sound. Proceedings of the IFA. Vol 17. pp 97-110).

Usage

f0ac(x, sr, dt, minf0, maxf0, nppw, nMaxCandidates, thSilence, thVoice, costOct, costOctJump, costVUV)

x

signal vector.

sr

sampling rate in Hertz.

dt

analysis hopsize in seconds; If this argument equals 0, the hopsize is set to nppw / minf0 / 4 (default=0)

minf0minimum f0 in Hz (default=75)

maxf0maximum f0 in Hz (default=400)

nppwnumber of f0 periods per analysis window (default=3)

nMaxCandidates

maximum number of f0 candidates (default=15)

thSilence

silence threshold (default=0.05)

thVoice

voicing threshold (default=0.4)

costOct

octave cost (default=0.01)

costOctJumpoctave jump cost (default=0.4)

costVUV

voiced/unvoiced transition cost (default=0.2)

Result

The f0 vector. The vector contains the f0 values in Hz. The vector length depends mainly on the length of the signal vector x and the hopsize dt. For unvoiced frames the f0 values are set to zero.

See also

formants, Programmer_Guide/SPU_Reference/F0AC

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