{'fraction_non_alphanumeric': 0.016563146997929608, 'fraction_numerical': 0.0, 'mean_word_length': 5.63013698630137, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Two forms of frequency standard deviation of a sine signal on multi-period measurements

This paper implements three algorithms for frequency measurement of a sinusoidal signal in noise, including zero-crossing method, Fourier transform method and nonlinear curve fitting method. Simulation results for multi-period present two forms of correspondence between the standard deviation of the frequency and the number of measurement periods. This paper analyzes these two relationships.