Method and apparatus for detecting and responding to events occurring on remote telephone
AssigneeSecurus Technologies, Inc.
InventorsDwight W. Kitchin, Scott D. Passe
Life of this patent
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Abstract
A process and a system are disclosed for detecting activity, e.g., three way calling, call forwarding, or the like, during a phone call. The process includes, and the system is configured for, establishing the call path between a first party and a second party, adding a reference tone to the call path, observing a reflected tone from the call path, and determining a relationship between the reference tone and the reflected tone. Information relating to the relationship may be reported for further analysis.
Claims37
A method of detecting activity during a phone call, the method comprising:
- establishing a call path between a first party and a second party;
- adding a first reference tone of a first repetitive waveform to a first electrical signal from the first party to the second party via the call path, wherein the first reference tone has a frequency less than 300 Hz;
- receiving a second electrical signal from the second party to the first party via the call path, the second electrical signal including a reflected tone of a second repetitive waveform, the second repetitive waveform representing the first reference tone reflected from the call path;
- and
- detecting change in a phase difference between the first reference tone in the first electrical signal and the reflected tone in the second electrical signal.
A method of detecting activity during a phone call, the method comprising:
- establishing a call path between a first party and a second party;
- adding a first reference tone of a first repetitive waveform to a first electrical signal from the first party to the second party via the call path, wherein the first reference tone has a frequency less than 300 Hz;
- adding a second reference tone to the first electrical signal of a second repetitive waveform, the second reference tone in conjunction with the first reference to generating a first tone envelope in the first electrical signal;
- receiving a second electrical signal from the second party to the first party via the call path, the second electrical signal including a second tone envelope including a third repetitive waveform, the second tone envelope representing the first tone envelope reflected from the call path;
- and
- detecting change in a phase difference between the first tone envelope in the first electrical signal and the second tone envelope in the second electrical signal.
A system for detecting activity during a phone call, the system comprising:
- a reference tone generator configured to generate a first reference tone of a first repetitive waveform;
- a summing module configured to add the first reference tone to a first electrical signal from a first party to a second party via an established call path;
- an interface configured to receive a second electrical signal from the second party to the first party via the call path, the second electrical signal including a reflected tone of a second repetitive waveform, the second repetitive waveform representing the first reference tone reflected from the call path, wherein the first reference tone has a frequency less than 300 Hz;
- and
- a detection module configured to determine a change in a phase difference between the first reference tone in the first electrical signal and the reflected tone in the second electrical signal.
Dependencies are inferred from the claim text.