A usable pitch detection algorithm, more accurate detection of the pitch value is a good program to learn the pitch period extraction principle.

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Pitch Determination Algorithm\Pitch Determination Algorithm [f0_time	f0_value	SHR	f0_candidates]=shrp(Y	Fs	F0MinMax	frame_length	timestep	SHR_Threshold	ceiling	med_smooth	CHECK_VOICING) - File Exchange - MATLAB Central.files\application.css
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.............................\Pitch Determination Algorithm [f0_time	f0_value	SHR	f0_candidates]=shrp(Y	Fs	F0MinMax	frame_length	timestep	SHR_Threshold	ceiling	med_smooth	CHECK_VOICING) - File Exchange - MATLAB Central.htm
.............................\...............................y	num_corrected]=destepfilter(x	f0_range	hz_or_st) - File Exchange - MATLAB Central.files\application.css
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