Systems and methods for detecting inmate to inmate conference calls
First Claim
1. A method for detecting inmate to inmate conference calls, the method comprising:
- monitoring a plurality of inmate communications by an inmate conference call detection server, wherein each inmate communication comprises an audio signal;
converting the audio signal of each inmate communication to a frequency domain signal over a first predetermined window of time for each inmate communication;
identifying one or more frequency peaks in the frequency domain signal for each inmate communication and a frequency value corresponding to each frequency peak;
generating a record for each inmate communication comprising frequency data regarding the one or more frequency peaks and frequency values for each inmate communication, resulting in a plurality of records for the plurality of inmate communications, wherein the plurality of records comprises at least one record associated with a first inmate;
storing the plurality of records in an inmate communication database;
monitoring a new inmate communication at an inmate communication device of a second inmate, wherein the new inmate communication comprises a new audio signal of the second inmate;
converting the new audio signal to a new frequency domain signal over a second predetermined window of time for the new inmate communication;
determining that a portion of the new frequency domain signal for the new inmate communication matches frequency data in a detected record in the inmate communication database, wherein the detected record is associated with the first inmate and comprises a detected audio signal;
detecting an inmate to inmate conference call between the first inmate and the second inmate based on the determination; and
in response to the detection, verifying the inmate to inmate conference call by matching the detected audio signal with a first voice biometric sample of the first inmate and the new audio signal with a second voice biometric sample of the second inmate.
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Abstract
A system for detecting inmate to inmate conference calls in a correctional facility is disclosed herein. The system includes a database and a conference call detection server, wherein the conference call detection server is configured to monitor a plurality of inmate communications, convert an audio signal of each inmate communication to a frequency domain signal, identify frequency data comprising one or more frequency peaks and corresponding frequency values in the frequency domain signal for each inmate communication, generate a record comprising the frequency data for each inmate communication, resulting in a plurality of records, store the plurality of records in the database, detect an inmate to inmate conference call by matching a frequency subset of a new inmate communication with frequency data in a detected record in the database, and verify the inmate to inmate conference call by matching audio with voice biometric samples.
49 Citations
20 Claims
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1. A method for detecting inmate to inmate conference calls, the method comprising:
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monitoring a plurality of inmate communications by an inmate conference call detection server, wherein each inmate communication comprises an audio signal; converting the audio signal of each inmate communication to a frequency domain signal over a first predetermined window of time for each inmate communication; identifying one or more frequency peaks in the frequency domain signal for each inmate communication and a frequency value corresponding to each frequency peak; generating a record for each inmate communication comprising frequency data regarding the one or more frequency peaks and frequency values for each inmate communication, resulting in a plurality of records for the plurality of inmate communications, wherein the plurality of records comprises at least one record associated with a first inmate; storing the plurality of records in an inmate communication database; monitoring a new inmate communication at an inmate communication device of a second inmate, wherein the new inmate communication comprises a new audio signal of the second inmate; converting the new audio signal to a new frequency domain signal over a second predetermined window of time for the new inmate communication; determining that a portion of the new frequency domain signal for the new inmate communication matches frequency data in a detected record in the inmate communication database, wherein the detected record is associated with the first inmate and comprises a detected audio signal; detecting an inmate to inmate conference call between the first inmate and the second inmate based on the determination; and in response to the detection, verifying the inmate to inmate conference call by matching the detected audio signal with a first voice biometric sample of the first inmate and the new audio signal with a second voice biometric sample of the second inmate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for detecting inmate to inmate conference calls in correctional facilities, the system comprising:
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an inmate communication database storing a plurality of records corresponding to a plurality of inmate communications at the correctional facilities, wherein the plurality of records includes at least one record associated with a first inmate; an inmate communication device associated with a second inmate; a conference call detection server comprising at least one processor and a memory; and a network that communicatively couples the inmate communication device, the inmate communication database, and the conference call detection server, wherein the at least one processor of the conference call detection server is configured to; receive an inmate communication of the second inmate from the inmate communication device, wherein the inmate communication comprises an audio signal; convert the audio signal of the inmate communication to a frequency domain signal over a predetermined window of time; determine that a portion of the frequency domain signal for the inmate communication matches frequency data in a detected record in the inmate communication database, wherein the detected record is associated with the first inmate and comprises a detected audio signal; detect an inmate to inmate conference call between the first inmate and a second inmate based on the determination; and in response to the detection, verify the inmate to inmate conference call by matching the detected audio signal with a first voice biometric sample of the first inmate and the audio signal with a second voice biometric sample of the second inmate. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A system for identifying frequency data for detection of inmate to inmate conference calls in correctional facilities:
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an inmate communication database; a conference call detection server comprising at least one processor and a memory storing a peak detection module and a voice biometrics module; a network that communicatively couples the inmate communication database and the conference call detection server, wherein the at least one processor of the conference call detection server is configured to; monitor a plurality of inmate communications, wherein each inmate communication comprises an audio signal; convert the audio signal of each inmate communication to a frequency domain signal over a predetermined window of time for each inmate communication; identify one or more frequency peaks in the frequency domain signal for each inmate communication and a frequency value corresponding to each frequency peak by applying the peak detection module to the frequency domain signal for each inmate communication; generate a record for each inmate communication comprising frequency data regarding the one or more frequency peaks and frequency values for each inmate communication and time data regarding time points at which each frequency peak occurred for each inmate communication, resulting in a plurality of records for the plurality of inmate communications; store the plurality of records in the inmate communication database; detect an inmate to inmate conference call between a first inmate and a second inmate by matching a frequency subset of a new inmate communication with frequency data in a detected record in the inmate communication database, wherein the detected record comprises a detected audio signal; and in response to the detection, verify the inmate to inmate conference call by using the voice biometrics module to match the detected audio signal with a first voice biometric sample of the first inmate and an audio sample of the new inmate communication with a second voice biometric sample of the second inmate. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification