{'fraction_non_alphanumeric': 0.01834862385321101, 'fraction_numerical': 0.001310615989515072, 'mean_word_length': 5.112, '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}}
A Study On Modulation Noise Reduction In Digital Recording

In digital recording, modulation noise is one of causes of degradation of the signal-to-noise ratio. A new mathematical model of reproduced digital signals including modulation noise is derived by considering that the major element of modulation noise in short-wave recording is head-to-media spacing variations. The total noise calculated from the mathematical model coincides with the noise extracted from reproduced digital signals of VCRs. A modulation noise reduction method which utilizes the mathematical model is proposed, and a simulation of reducing the modulation noise is shown. The improvement in the signal-to-noise ratio as a result of removing the modulation noise is approximately 2 dB.