Patent ID: 11863703
Assignee: GLOBAL TEL*LINK CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 9:
10. A system for identifying frequency data for detection of inmate to inmate conference calls in correctional facilities, the system comprising:
a memory storing an inmate communication database; and
at least one processor configured to:
obtain and store in the memory, profile information and inmate calling information of an inmate from a correctional facility;
convert an audio signal of an inmate communication to a frequency domain signal over a predetermined window of time;
identify a frequency peak in the frequency domain signal and a frequency value corresponding to the frequency peak;
store the frequency domain signal associated with the inmate communication as a detected record in the inmate communication database;
receive inmate communication data for a new inmate communication;
convert the new inmate communication into a new frequency domain signal;
query the inmate communication database to determine if a portion of the new frequency domain signal for a new inmate communication matches frequency data in the detected record;
identify a number of frequency matches based on the determining;
compare the number of frequency matches to a predetermined threshold value;

detect an inmate to inmate conference call based on the comparison;
query the inmate communication database using parameter values corresponding to the inmate communication data; and
receive in response to the query using the parameter values corresponding to the inmate communication data, a list of records comprising a subset of the plurality of records with data matching one or more parameter values,
wherein the parameter values corresponding to the inmate communication data comprise a date of the inmate communication corresponding to the inmate communication data, a time of the inmate communication, a type of encoding of the inmate communication, a rate of encoding of the inmate communication, a location of an inmate communication device utilized during the inmate communication, and types of devices used during the inmate communication.