Telephonic communications – Call or terminal access alarm or control – Fraud or improper use mitigating or indication
Reexamination Certificate
2006-10-17
2006-10-17
Harold, Jefferey F. (Department: 2614)
Telephonic communications
Call or terminal access alarm or control
Fraud or improper use mitigating or indication
C379S406140, C379S207010
Reexamination Certificate
active
07123704
ABSTRACT:
Disclosed herein is a three-way call detection system and method for detecting the addition of a third party to a pre-existing telephonic connection between a first party and a second party. The system comprises: a meter for measuring the amplitude of a line voltage of a telephonic connection between a first party and a second party, said line voltage having a frequency band F1; a first filter to remove a frequency band F2from said line voltage and output a filtered signal, said frequency band F2being a subset of F1; a white noise generator for generating a low level white noise signal with a frequency band that corresponds to F2and with an amplitude that is significantly below an amplitude level of the measured line voltage for frequency band F2; a coupler for combining the low level white noise signal to the filtered signal, thereby outputting an additive line voltage; a second filter that passes only a portion of the additive line voltage, said signal that passes being referred to as the band-passed signal, said band-passed signal having a frequency range F3, said frequency band F3being a subset of F1and being inclusive of F2; and a processor for processing the band-passed signal and determining a baseline amplitude level associated with a two-way call. The processor monitors the band-passed signal in the time domain for a shift in baseline amplitude level, which shift is associated with the addition of a third party to the telephonic connection. The white noise being added is preferably at least 3 dB below the amplitude level of the measured line voltage, more preferably at least 10 dB, more preferably at least 20 db, and most preferably 40 db below. The frequency band F2is selected from F1to be significantly large enough to permit more reliable detection, and yet small enough to be barely perceptible to the listener. For example, F2may comprise the frequencies from 1–2 KHz. An F2of 1–1.3 KHz. also functions well.
REFERENCES:
patent: 4670628 (1987-06-01), Boratgis et al.
patent: 4691347 (1987-09-01), Stanley et al.
patent: 4737982 (1988-04-01), Boratgis et al.
patent: 4813070 (1989-03-01), Humphreys et al.
patent: 4907221 (1990-03-01), Pariani et al.
patent: 4918719 (1990-04-01), Daudelin
patent: 4995030 (1991-02-01), Helf
patent: 5291548 (1994-03-01), Tsumura et al.
patent: 5319702 (1994-06-01), Kitchin et al.
patent: 5345595 (1994-09-01), Johnson et al.
patent: 5425091 (1995-06-01), Josephs
patent: 5438616 (1995-08-01), Peoples
patent: 5502762 (1996-03-01), Andrew et al.
patent: 5535194 (1996-07-01), Ashley et al.
patent: 5535261 (1996-07-01), Brown et al.
patent: 5539731 (1996-07-01), Haneda et al.
patent: 5555551 (1996-09-01), Rudokas et al.
patent: 5590171 (1996-12-01), Howe
patent: 5592548 (1997-01-01), Sih
patent: 5745558 (1998-04-01), Richardson, Jr. et al.
patent: 5748726 (1998-05-01), Unno
patent: 5757889 (1998-05-01), Ohtake
patent: 5796811 (1998-08-01), McFarlen
patent: 5805685 (1998-09-01), McFarlen
patent: 5835486 (1998-11-01), Davis et al.
patent: 5867562 (1999-02-01), Scherer
patent: 5883945 (1999-03-01), Richardson, Jr. et al.
patent: 5907602 (1999-05-01), Peel et al.
patent: 5920834 (1999-07-01), Sih et al.
patent: 5926533 (1999-07-01), Gainsboro
patent: 5999828 (1999-12-01), Sih et al.
patent: 6035034 (2000-03-01), Trump
patent: 6052462 (2000-04-01), Lu
patent: 6072860 (2000-06-01), Kek et al.
patent: 6078567 (2000-06-01), Traill et al.
patent: 6078645 (2000-06-01), Cai et al.
patent: 6141406 (2000-10-01), Johnson
patent: 6185416 (2001-02-01), Rudokas et al.
patent: 6763099 (2004-07-01), Blink
patent: 2 075 313 (1981-11-01), None
patent: 59225626 (1984-12-01), None
patent: 60010821 (1985-01-01), None
patent: 61135239 (1986-06-01), None
patent: 3065826 (1991-03-01), None
patent: PCT/US9514230 (1995-11-01), None
Coherent Announces Industry's First Remote Management System for Echo Canceller, Business Wire, Mar. 3, 1997.
Audioconferencing options. (Teleconference Units, Conference Bridges and Sevice Bureaus) (includes related articles on speech processing and new conferencing technology), Frankel, Elana, Teleconnect, v 14, n 5, p. 131(3), May 1996.
Digital on Call, Silberg, Lurie, HFN The Weekly Newspaper for the Home Furnishing Network, p. 97, Mar. 17, 1997.
Inmate Telephone Services: Large Business: Voice, Oct. 2, 2001.
Harold Jefferey F.
Inmate Telephone, Inc.
Wiley Rein & Fielding LLP
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