{'fraction_non_alphanumeric': 0.028169014084507043, 'fraction_numerical': 0.0, 'mean_word_length': 5.416666666666667, '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}}
Clockless signal-dependent compressive sensing of multitone signals using time encoding machine

In this paper we use modified sample-and-hold asynchronous sigma-delta modulator (ASDM) time encoding machine (TEM) for compressive sensing (CS) of multitone signals. Nouniform sampling, suitable for CS, is inherent property of TEM, however it is not random as it is common in CS schemes, but signal-dependent. The irregularity of TEM sampling instants is analyzed using theory of dynamical systems and recognized as periodic or chaotic, depending on the input signal. We show experimentally that such behavior deteriorates CS effectiveness, but it can be avoided using randomization by adding simple bipolar signal with sufficiently high amplitude to the input. Finally, a signal-dependent, asynchronous randomization circuit for generation of pseudo-random sequences by the use of binary encoded output of TEM is introduced.