Jeffrey K Ward

US Patent:

52607046, Nov 9, 1993

Filed:

May 31, 1991

Appl. No.:

7/712160

Inventors:

Charles H. Hustig - Hudson WI
Donald W. Moses - Eagan MN
Robert S. Bradford - Woodland Hills CA
Jeffrey L. Ward - Hudson WI
Wayne P. Olson - River Falls WI
Janice L. Cox - St. Paul MN
Raymond S. Miller - Seattle WA
Robert W. Moses - Seattle WA
James M. Kresse - Marlton NJ

Assignee:

Wadia Digital Corporation - River Falls WI

International Classification:

H03M 166
H03F 2100

US Classification:

341144

Abstract:

A direct power output digital to analog conversion of digital audio signals operates to directly convert digital audio signals into an analog power audio output signal capable of driving a speaker, such that there is no need for further amplification or modification of the audio output signal after the direct power output digital to analog conversion of the digital audio signals. The direct power output digital to analog conversion incorporates a digital-to-analog converter within the same feedback circuit as a current-to-voltage power amplifier by using a single resistive feedback network to supply the feedback signal from the output terminal of the current-to-voltage power amplifier to the summing junction of the same current-to-voltage power amplifier.

US Patent:

46726055, Jun 9, 1987

Filed:

Mar 20, 1984

Appl. No.:

6/591509

Inventors:

Charles H. Hustig - Hudson WI
Jeffrey L. Ward - Hudson WI
Donald W. Moses - Minneapolis MN
Robert S. Bradford - Woodland Hills CA

Assignee:

Applied Spectrum Technologies, Inc. - Minneapolis MN

International Classification:

H04J 112
H04J 114

US Classification:

370 76

Abstract:

A high speed and relatively error free communications system is disclosed which enables the high speed transmission of data at a 19. 2 kilobit per second rate. The data is transmitted over the same communications medium as voice transmissions, the data transmission being virtually imperceptible to the user of the analog telephone system. Connection to and from the data terminals is made through an RS232C interface. A spread spectrum technique is utilized which "whitens" the signals of the data terminal regardless of whether the terminal is idle, transmitting or receiving data. Virtual error free transmission is achieved by interleaving bits, so that noise does not destroy the data, and by error detection and correction techniques which assure that the data, as received, is identical to that transmitted. By using a variable pseudo random code, privacy of data communications are enhanced and cross-talk is substantially eliminated. The resulting system is one that can use a single twisted pair wire for transmission and is capable of transmitting data at a high rate of speed while leaving the analog voice transmission resident and unaffected on the line.

US Patent:

46776869, Jun 30, 1987

Filed:

Jun 10, 1983

Appl. No.:

6/503321

Inventors:

Charles H. Hustig - Hudson WI
Jeffrey L. Ward - Hudson WI

Assignee:

Applied Spectrum Technologies, Inc. - Minneapolis MN

International Classification:

H04H 104

US Classification:

455 5

Abstract:

A communications system which enables enhanced services to be provided over cable TV systems. The design of the system is such that amplification is not required. Therefore, two-way transmission is possible on the low band of "two-way capable" cable systems and intermediate power failures do not affect transmission. Transmission of data takes place in the low band frequency range of five to thirty megahertz. The system design is such that it can withstand over a hundred dB loss between the remote terminal and the head-end. Carrier frequencies, when received, are interleaved for purposes of decoding and microprocessor based controls are used for automatic gain control and error correction. In a preferred embodiment of the invention, two thousand five hundred carriers, each transmitting eight digital data channels of information can be simultaneously transmitted from remote terminals without any effect whatsoever on the TV signals being transmitted at the high band frequencies. The resulting system is a very economical and dependable method to achieve passive transmission of data over cable TV systems.

Address:

21965 Volga St NE, Wyoming, MN 55092

Phone:

6514621720

VIN:

JTHCK262985023446

Make:

LEXUS

Model:

IS 250

Year:

2008

Address:

21965 Volga St NE, Wyoming, MN 55092

Phone:

6514621720

VIN:

2HGFG21597H701039

Make:

HONDA

Model:

CIVIC

Year:

2007