| Patent Number |
Title Of Patent |
Date Issued |
| 7529789 |
Method for representing complex numbers in a communication system |
May 5, 2009 |
| A method for storage for complex numbers that employs a shared exponent field is disclosed. Rather than each floating point component of an complex number having its own distinct signed mantissa and exponent fields, each component includes a distinct signed mantissa field and shares |
| 6636519 |
Network access method and network access server therefor |
October 21, 2003 |
| Apparatus and method for enabling bilateral transmission of digital data between a local area network and telephone company networks employing both analog and digital telephone lines. A modem modulates signals responsive to signals from a local area network representing an outgoing call |
| 6567520 |
Method and apparatus for detecting multiple telephone off-hook conditions |
May 20, 2003 |
| A method and apparatus for the detection of one or more telephone off-hook conditions using an analog-to-digital converter to detect voltage changes between tip and ring lines of a telephone network loop. An isolation network provides substantial electrical isolation for a detection devi |
| 5912888 |
Digital network access server |
June 15, 1999 |
| Apparatus and method for enabling bilateral transmission of digital data between a local area network and telephone company networks employing both analog and digital telephone lines. A modem modulates signals responsive to signals from a local area network representing an outgoing call |
| 5892757 |
Asymmetric duplex modem utilizing narrow band echo cancellation |
April 6, 1999 |
| A full-duplex modem having improved transmission speeds over voice grade telephone circuits that extends the concepts of asymmetric transmission to include echo cancellation techniques. The preferred modem has a high speed forward channel and an overlapping low speed back channel and is |
| 5579305 |
Asymmetric duplex modem utilizing narrow band echo cancellation |
November 26, 1996 |
| A full-duplex modem having improved transmission speeds over voice grade telephone circuits that extends the concepts of asymmetric transmission to include echo cancellation techniques. The preferred modem has a high speed forward channel and an overlapping low speed back channel and is |
| 5528595 |
Modem input/output signal processing techniques |
June 18, 1996 |
| Apparatus and method for enabling bilateral transmission of digital data between a local area network and telephone company networks employing both analog and digital telephone lines. A modem modulates signals responsive to signals from a local area network representing an outgoing call |
| 4908699 |
Component video accumulation effect |
March 13, 1990 |
| A method for accumulating component video signals non-additively adds the luminance components to produce an accumulated luminance component, and additively adds the chrominance components to produce an accumulated chrominance component. The accumulated chrominance component may be c |
