Patent ID: 9300790
Filing Date: 2016-03-29
CPC Classification: G10L,H04M

Claim Text:
1. A method, in an inmate telephone monitoring system, for detecting the voice of an unauthorized person in a conversation on a phone call between an incarcerated inmate on a calling-party side of a phone line and at least one called party on a called-party side of the phone line, comprising: initially verifying, by the inmate telephone monitoring system, the authorization of an inmate voice on the calling-party side of the line; setting the frequency of an automatic periodic voice verification based on the incarcerated inmate or the called party; subsequently performing the automatic periodic voice verification, by the inmate telephone monitoring system, on at least one side of the line during the conversation to detect the voice of an unauthorized conversation participant, wherein the voice verification utilizes spectral analysis of a digitized representation of the conversation; generating an electronic signal indicative of the detection of the voice of an unauthorized person within said conversation; and Automatically increasing the frequency of said periodic voice verification, by the inmate telephone monitoring system, subsequent to the detection of one of an unauthorized voice during said conversation, wherein the frequency increase includes varying of frequency of the periodic voice verification based on the system computational load.