Methods, systems and computer program products for carrier...

Details Methods, systems and computer program products for carrier... Methods, systems and computer program products for carrier...

2005-11-22

2005-11-22

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Transceivers

Modems

Reexamination Certificate

active

06967995

ABSTRACT:
Methods, systems and computer program products are provided which utilize a variable threshold for carrier drop detection. The carrier drop detection threshold is updated based on a recognized data sequence contained within the signal received by the modem. The received signal is demodulated to obtain the signal data and an updated threshold is latched when a desired data sequence is recognized in the demodulated data. Accordingly, the threshold may be updated and set as an offset from or a percentage of the carrier signal level at the time of receipt of the desired data sequence. For example, in a V.90 modem using a V.8 phase 1 sequence, receipt of the CM signal (for the answer modem) or the JM signal (for the call modem) may be used to latch an updated level for the carrier drop detection threshold, which may then be used for detecting carrier drop during the silence transmission at the end of phase 1 to allow reliable preparation of the modem for receipt of the INFO0 signal at the start of phase 2.

REFERENCES:
patent: 3557308 (1971-01-01), Alexander et al.
patent: 3622877 (1971-11-01), MacDavid et al.
patent: 3683120 (1972-08-01), Schenkel
patent: 3729717 (1973-04-01), de Koe et al.
patent: 4112427 (1978-09-01), Hofer et al.
patent: 4132242 (1979-01-01), Carroll, Jr.
patent: 4208630 (1980-06-01), Martinez
patent: 4237552 (1980-12-01), Aikoh et al.
patent: 4270027 (1981-05-01), Agrawal et al.
patent: 4434322 (1984-02-01), Ferrell
patent: 4450556 (1984-05-01), Boleda et al.
patent: 4577310 (1986-03-01), Korsky et al.
patent: 4578796 (1986-03-01), Charalambous et al.
patent: 4720861 (1988-01-01), Bertrand
patent: 4731816 (1988-03-01), Hughes-Hartogs
patent: 4756007 (1988-07-01), Qureshi et al.
patent: 4760598 (1988-07-01), Ferrell
patent: 4797898 (1989-01-01), Martinez
patent: 4833706 (1989-05-01), Hughes-Hartogs
patent: 4868863 (1989-09-01), Hartley et al.
patent: 4884285 (1989-11-01), Heynen et al.
patent: 4890303 (1989-12-01), Bader
patent: 4890316 (1989-12-01), Walsh et al.
patent: 4894847 (1990-01-01), Tjahjadi et al.
patent: 4901333 (1990-02-01), Hodgkiss
patent: 4943980 (1990-07-01), Dobson et al.
patent: 4953210 (1990-08-01), McGlynn et al.
patent: 4967413 (1990-10-01), Otani
patent: 4972360 (1990-11-01), Cuckier et al.
patent: 4985902 (1991-01-01), Gurcan
patent: 4991169 (1991-02-01), Davis et al.
patent: 4995030 (1991-02-01), Helf
patent: 5005144 (1991-04-01), Nakajima et al.
patent: 5007047 (1991-04-01), Sridhar et al.
patent: 5014299 (1991-05-01), Klupt et al.
patent: 5033062 (1991-07-01), Morrow et al.
patent: 5038365 (1991-08-01), Belloc et al.
patent: 5040190 (1991-08-01), Smith et al.
patent: 5052000 (1991-09-01), Wang et al.
patent: 5058134 (1991-10-01), Chevillat et al.
patent: 5065410 (1991-11-01), Yoshida et al.
patent: 5067125 (1991-11-01), Tsuchida
patent: 5068875 (1991-11-01), Quintin
patent: 5107520 (1992-04-01), Karam et al.
patent: 5111481 (1992-05-01), Chen et al.
patent: 5119401 (1992-06-01), Tsujimoto
patent: 5119403 (1992-06-01), Krishnan
patent: 5134611 (1992-07-01), Steinka et al.
patent: 5142552 (1992-08-01), Tzeng et al.
patent: 5157690 (1992-10-01), Buttle
patent: 5187732 (1993-02-01), Suzuki
patent: 5210755 (1993-05-01), Nagler et al.
patent: 5225997 (1993-07-01), Lederer et al.
patent: 5253272 (1993-10-01), Jaeger et al.
patent: 5253291 (1993-10-01), Naseer et al.
patent: 5260974 (1993-11-01), Johnson et al.
patent: 5265151 (1993-11-01), Goldstein
patent: 5272657 (1993-12-01), Basehore et al.
patent: 5285474 (1994-02-01), Chow et al.
patent: 5291479 (1994-03-01), Vaziri et al.
patent: 5311578 (1994-05-01), Bremer et al.
patent: 5317594 (1994-05-01), Goldstein
patent: 5351134 (1994-09-01), Yaguchi et al.
patent: 5353280 (1994-10-01), Ungerböck
patent: 5386438 (1995-01-01), England
patent: 5394110 (1995-02-01), Mizoguchi
patent: 5394437 (1995-02-01), Ayanoglu et al.
patent: 5398303 (1995-03-01), Tanaka
patent: 5402445 (1995-03-01), Matsuura
patent: 5406583 (1995-04-01), Dagdeviren
patent: 5418842 (1995-05-01), Cooper
patent: 5432794 (1995-07-01), Yaguchi
patent: 5434884 (1995-07-01), Rushing et al.
patent: 5475711 (1995-12-01), Betts et al.
patent: 5491720 (1996-02-01), Davis et al.
patent: 5513216 (1996-04-01), Gadot et al.
patent: 5519703 (1996-05-01), Chauffour et al.
patent: 5528625 (1996-06-01), Ayanoglu et al.
patent: 5528679 (1996-06-01), Taarud
patent: 5533048 (1996-07-01), Dolan
patent: 5534913 (1996-07-01), Majeti et al.
patent: 5546395 (1996-08-01), Sharma et al.
patent: 5563908 (1996-10-01), Kaku et al.
patent: 5566211 (1996-10-01), Choi
patent: 5598401 (1997-01-01), Blackwell et al.
patent: 5625643 (1997-04-01), Kaku et al.
patent: 5634022 (1997-05-01), Crouse et al.
patent: 5640387 (1997-06-01), Takahashi et al.
patent: 5646958 (1997-07-01), Tsujimoto
patent: 5671250 (1997-09-01), Bremer et al.
patent: 5694420 (1997-12-01), Ohki et al.
patent: 5710792 (1998-01-01), Fukawa et al.
patent: 5724393 (1998-03-01), Dagdeviren
patent: 5726765 (1998-03-01), Yoshida et al.
patent: 5729226 (1998-03-01), Betts et al.
patent: 5732104 (1998-03-01), Brown et al.
patent: 5734663 (1998-03-01), Eggenberger
patent: 5751717 (1998-05-01), Babu et al.
patent: 5751796 (1998-05-01), Scott et al.
patent: 5754594 (1998-05-01), Betts et al.
patent: 5757849 (1998-05-01), Gelblum et al.
patent: 5757865 (1998-05-01), Kaku et al.
patent: 5761247 (1998-06-01), Betts et al.
patent: 5768311 (1998-06-01), Betts et al.
patent: 5778024 (1998-07-01), McDonough
patent: 5784377 (1998-07-01), Baydar et al.
patent: 5784405 (1998-07-01), Betts et al.
patent: 5784415 (1998-07-01), Chevillat et al.
patent: 5793809 (1998-08-01), Holmquist
patent: 5796808 (1998-08-01), Scott et al.
patent: 5801695 (1998-09-01), Townshend
patent: 5805669 (1998-09-01), Bingel et al.
patent: 5809075 (1998-09-01), Townshend
patent: 5812537 (1998-09-01), Betts et al.
patent: 5815534 (1998-09-01), Glass
patent: 5825816 (1998-10-01), Cole et al.
patent: 5825823 (1998-10-01), Goldstein et al.
patent: 5822371 (1998-11-01), Strolle et al.
patent: 5831561 (1998-11-01), Cai et al.
patent: 5835532 (1998-11-01), Strolle et al.
patent: 5835538 (1998-11-01), Townshend
patent: 5838724 (1998-11-01), Cole et al.
patent: 5839053 (1998-11-01), Bosch et al.
patent: 5844940 (1998-12-01), Goodson et al.
patent: 5850388 (1998-12-01), Anderson et al.
patent: 5850421 (1998-12-01), Misra et al.
patent: 5852631 (1998-12-01), Scott
patent: 5862141 (1999-01-01), Trotter
patent: 5862179 (1999-01-01), Goldstein et al.
patent: 5862184 (1999-01-01), Goldstein et al.
patent: 5870429 (1999-02-01), Moran, III et al.
patent: 5872817 (1999-02-01), Wei
patent: 5881066 (1999-03-01), Lepitre
patent: 5881102 (1999-03-01), Samson
patent: 5887027 (1999-03-01), Cohen et al.
patent: 5911115 (1999-06-01), Nair et al.
patent: 5914982 (1999-06-01), Bjarnason et al.
patent: 5918204 (1999-06-01), Tsurumaru
patent: 5926506 (1999-07-01), Berthold et al.
patent: 0 473 116 (1991-08-01), None
patent: 0 659 007 (1994-11-01), None
patent: 0 669 740 (1994-12-01), None
patent: 2 345 019 (1976-03-01), None
patent: WO 96/18261 (1996-06-01), None
patent: WO 98/37657 (1998-08-01), None
Erup, et al.,Interpolation in Digital Modems—Part II: Implementation and Performance, IEEE Transactions on Communications, vol. 41, No. 6, pp. 998-1008 (Jun. 1993).
Fischer,Signal Mapping for PCM Modems, V-pcm Rapporteur Meeting, Sunriver, Oregon, USA, , 5 pgs. (Sep. 4-12, 1997).
Gardner,Interpolation in Digital Modems—Part 1: Fundamentals, IEEE Transactions on Communications, vol. 41, No. 3, pp. 501-507 (Mar. 1993).
Humblet et al.,The Information Driveway, IEEE Communications Magazine, pp. 64-68 (Dec. 1996).
Kalet et al.,The Capacity of PCM Voiceband Channels, IEEE International Conference on Communications '93, pp. 507-511 (Geneva, Switzerland, May 23-26, 1993).
Mueller et al.,Timing Recovery in Digital Synchronous Data Receiver, IEEE Transactions on Communications, vol. Com-24, No. 5, pp. 516-531 (May 1976).
Okubo et al.,Building Block Design of Large Capacity PCM-TDMA Subscriber System and Direct Digital Interface to Digital Exchange, Japan Radio Co.,

Affiliated with

Also associated with

Rating

Methods, systems and computer program products for carrier... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Methods, systems and computer program products for carrier..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods, systems and computer program products for carrier... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3464438