{'fraction_non_alphanumeric': 0.022982635342185902, 'fraction_numerical': 0.0040858018386108275, 'mean_word_length': 5.00920245398773, '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}}
Indoor acoustic mapping and geolocation

Shyy, Thomas M.S.M.E., Purdue University, December 2014. Indoor Acoustic Mapping and Geolocation. Major Professor: Kartik B. Ariyur, School of Mechanical Engineering. The Global Positioning System (GPS) is widely used in navigations of flights, vehicles and travelers nowadays. However, the signals are not always available and there are some cases where the receptions of the GPS signal can be lost because of the presence of urban canyons, buildings, tunnels and forests. Another down side for the GPS is that indoor positioning can be really di cult because of the greater signal interference from the indoor. On the other hand, the concept of echolocation has also been used for positioning purposes. Echolocation o↵ers a promising approach to improve the quality of life of people with blindness using the ”searching” and ”scanning” strategies. Scanning consists of head movement from a person to detect the object while searching relies heavily on information within the echo rather than headmovement. Motivated by the concept of echolocation positioning technique for blinds, we have developed a model system to estimate the geolocation within our designated testing facility, an echo chamber room. The echo chamber is designed to have its surrounding to have the least acoustic impact absorbance to allow the least reduction of refelcted sound waves’ intensities. In the room, a sound speaker is used as the sound source to carry the pulse wave we created to represent the ”snap” from blinds. During the measurement, the position of our sound source always stays stationary while a sound receiver equipped with 64 measurement microphones is collecting the sound intensities for di↵erent sound waves from the source. We have chosen sixteen receiving positions to represent the room due to the limitation of the our cords’ length of the receiver. Measurements will be performed one position at a time for the 16