Multiplex communications – Duplex – Duplex repeaters or extenders
Reexamination Certificate
2005-11-18
2010-02-16
Wilson, Robert W (Department: 2475)
Multiplex communications
Duplex
Duplex repeaters or extenders
C370S348000, C370S464000, C455S402000
Reexamination Certificate
active
07664060
ABSTRACT:
An information terminal incorporates a network interface and an extension interface, and in the case of outside call, an audio send signal is modulated into an audio signal frequency band, and sent to the exchange through a private telephone line and a subscriber's line by way of the network interface. An audio receive signal sent from the exchange through the subscriber's line and private telephone line is demodulated into an ordinary audio frequency band through the network interface. On the other hand, in the case of extension service, an audio send signal is converted into a packetized digital signal by an extension interface circuit, and is further modulated into a higher frequency band so as not to overlap with the audio signal frequency band, and is transmitted through the private telephone line.
REFERENCES:
patent: 4821265 (1989-04-01), Albal et al.
patent: 5231634 (1993-07-01), Giles et al.
patent: 5268666 (1993-12-01), Michel et al.
patent: 5717751 (1998-02-01), Yagi et al.
patent: 5742596 (1998-04-01), Baratz et al.
patent: 5831980 (1998-11-01), Varma et al.
patent: 6111570 (2000-08-01), Sugikawa et al.
patent: 6130893 (2000-10-01), Whittaker et al.
patent: 6404773 (2002-06-01), Williams et al.
patent: 6407987 (2002-06-01), Abraham
patent: 6434123 (2002-08-01), Park
patent: 6480510 (2002-11-01), Binder
patent: 6549906 (2003-04-01), Austin et al.
patent: 6580710 (2003-06-01), Bowen et al.
patent: 6668328 (2003-12-01), Bell
patent: 6731627 (2004-05-01), Gupta et al.
patent: 7054303 (2006-05-01), Miyazaki et al.
patent: 6-086362 (1994-03-01), None
patent: 07-193861 (1995-07-01), None
patent: 07-336432 (1995-12-01), None
patent: 11-075229 (1999-03-01), None
Aritaka Akitoshi
Koga Naoki
Miyazaki Tomiya
Ogata Keisuke
Takeda Yutaka
Panasonic Corporation
RatnerPrestia
Wilson Robert W
LandOfFree
Information terminal and information terminal system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Information terminal and information terminal system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Information terminal and information terminal system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4207429