Patent ID: 9621713
Date: 2017-04-11
CPC Classifications: G10L,H04L,H04M

Claim:
1. A method of detecting unauthorized communications between two incarcerated persons, comprising: monitoring a plurality of communications, each of the monitored communications originated from a communication device; generating a time-segmented call signal from each of the plurality of monitored communications; storing in a database the dialed number for each monitored communication, the start time of each monitored communication, and the duration or end time of each monitored communication; identifying a first communication and a second communication in the database of monitored communications, where the identified first and second communications at least partially overlap in time; generating a first time-segmented call signature for a portion of the first communication that overlaps with the second communication and further generating a second time-segmented call signature for a portion of the second communication that overlaps with the first communication; analyzing the first time-segmented call signature and the second time-segmented call signature to identify identical segment signature data in an overlapping portion of the first communication and the second communication, wherein the first time-segmented call signature and the second time-segmented call signature are analyzed using a digital signal processor; and alerting a prison official when identical segment signature data is identified in the overlapping communications.