Tina S Lee

US Patent:

53814258, Jan 10, 1995

Filed:

Mar 27, 1992

Appl. No.:

7/858713

Inventors:

Donald L. Bitzer - Urbana IL
Mladen A. Vouk - Cary NC
Vijay Srinivasan - Cary NC
Sunny K. Lo - Raleigh NC
Ajay Dholakia - Raleigh NC
Elena M. Gonzalez - Raleigh NC
Tina M. Lee - Raleigh NC
LiFeng Wang - Raleigh NC
Havish Koorapaty - Raleigh NC

Assignee:

North Carolina State University - Raleigh NC

International Classification:

H03M 1300

US Classification:

371 43

Abstract:

A convolutional encoding/decoding system encodes a data bit stream into n bit parity sets from k bit data bit sets, using code words of length L. The system is dependent upon the finding that unique data to parity tables can be generated where both data and parity bit blocks are w bits in length. The value of w=n(L-k)/(n-k). An encoded parity bit stream is subjected to Exclusive OR operation through a connection mask or masks that are dependent upon the encoding code words. The Exclusive OR operation generates syndrome symbols indicative of the presence of errors in the parity bit stream and which are employed to address a correction table. Parity correction values are derived from the correction table and are used to revise the parity bit stream, which is then decoded, using a parity to data table. A number of parity correction procedures are disclosed.

US Patent:

57640351, Jun 9, 1998

Filed:

Sep 23, 1996

Appl. No.:

8/717675

Inventors:

Tina May Lee - Raleigh NC

Assignee:

Ericsson Inc. - Research Triangle Park NC

International Classification:

H02J 700
H02J 704

US Classification:

320160

Abstract:

A system and method for automatically enabling rapid charging of a battery in a portable phone when a battery charger is connected to the portable phone is disclosed. The system includes a battery charger circuit having an input for receiving an input voltage from the battery charger, a sense resistor through which a rapid charging current from the battery charger input voltage is generated, a charge switch connected to the sense resistor which receives the battery charger circuit input, a trickle resistor connected in parallel to the charge switch through which a slow charging current from the battery charger input voltage is generated, wherein the rapid charging current is generated when the charge switch is closed and the trickle charging current is generated when the charge switch is open, and an output for supplying the generated charging current to the battery. The system also includes at least one voltage regulator having an input connected to the battery and an output for supplying a voltage to circuitry of the portable phone for controlling the battery charger circuit, as well as a circuit for selectively enabling the voltage regulator depending on the battery voltage. In this system, the rapid charging current may be supplied to the battery from the battery charging circuit only when the voltage regulator is enabled.

US Patent:

60140089, Jan 11, 2000

Filed:

Jan 22, 1998

Appl. No.:

9/012122

Inventors:

Patrick D. Hartzell - Cary NC
Brian D. Miller - Durham NC
Tina M. Lee - Raleigh NC
John W. Northcutt - Chapel Hill NC
Fred P. Nading - Cary NC

Assignee:

Ericsson, Inc. - Research Triangle Park NC

International Classification:

H01M 1046

US Classification:

320106

Abstract:

The present invention entails a battery identification system to be utilized by cellular telephones, battery chargers, and other electrical devices for identification of the battery types employed within such devices. The battery identification system comprises a battery type identification circuit that includes one or more input switches that are coupled to a voltage divider network that is made up of a series of voltage divider segments. Each voltage divider segment is designed to produce a signal that is indicative of the on/off state of a particular input switch. To actuate the input switches, the employed battery is provided with one or more switch actuators, where the position and spacing of the switch actuators on the battery in effect uniquely identifies the battery type. Various switching and actuating configurations are contemplated, including mechanical, galvanic, magnetic, and optical systems.