Apparatus for modulating/demodulating signals

Patent 5963588 Issued on October 5, 1999. Estimated Expiration Date:

March 21, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Method and apparatus for connecting ISDN devices over an analog telephone line
Patent #: 4884269
Issued on: 11/28/1989
Inventor: Duncanson, et al.

Ensemble modem structure for imperfect transmission media
Patent #: 5054034
Issued on: 10/01/1991
Inventor: Hughes-Hartogs

Simultaneous voice and data system using the existing two-wire inter-face
Patent #: 5214650
Issued on: 05/25/1993
Inventor: Renner, et al.

Apparatus for interfacing analog telephones and digital data terminals to an ISDN line
Patent #: 5305312
Issued on: 04/19/1994
Inventor: Fornek, et al.

Communication apparatus with cross-talk protection
Patent #: 5375166
Issued on: 12/20/1994
Inventor: Odaohara

Multiple call offering method for use with an analog station and an ISDN station that share a directory number
Patent #: 5600654
Issued on: 02/04/1997
Inventor: Brown, et al.

ISDN terminal adapter for use with external modem and employing software-based serial communication framing for ISDN `D` channel signaling
Patent #: 5708663
Issued on: 01/13/1998
Inventor: Wright, et al.

Wireless radio modem with minimal inter-device RF interference Patent #: 5764693
Issued on: 06/09/1998
Inventor: Taylor, et al.

Inventors

Assignee

Motorola, Inc.

Application

No. 822966 filed on 03/21/1997

US Classes:

375/222, Modems (data sets)332/108, Plural modulation370/420, For connecting plural subscribers to a network (i.e., network termination)370/476, Byte assembly and formatting375/219, TRANSCEIVERS379/93.28, Modulated audio tone379/402Hybrid circuit

Examiners

Primary: Pham, Chi
Assistant: Tran, Khai

Attorney, Agent or Firm

Chastain; Lee E.

International Classes

H04B 001/38
H04J 003/00
H04M 001/00
H03K 003/00

Abstract

An apparatus connects a data processing system (10) with an analog telephone line and/or an ISDN line. The apparatus modulates and demodulates data from the data processing system (10) to either of the two different telephone protocols without adding unnecessary expense or noise to the system.