David C Willard

US Patent:

6477381, Nov 5, 2002

Filed:

Jun 28, 1999

Appl. No.:

09/331909

Inventors:

Karl Robert Weiss - Condotel, SG
Dee Nai Ong - Singapore, SG
David Frank Willard - Plantation FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 118

US Classification:

455458, 4551612, 4551651, 4551831, 4551851, 340 743

Abstract:

A communication device ( ) comprising a receiver ( ) for receiving coded messages transmitted on one or more channels. There is a micro-processor ( ), in communication with the receiver ( ) and a frequency synthesizer ( ) coupled to both the micro-processor ( ) and the receiver ( ) to thereby control reception of the channels. The communication device ( ) also has a memory ( ) storing a group of-channel frequencies, wherein the micro-processor ( ) is adapted, in combination with the frequency synthesizer ( ), to control the receiver ( ) to scan at least some of the channels during baud detect periods of a protocol cycle associated with at least one of the channels. Further, the micro-processor ( ) cyclically offsets a start of the baud detect periods after completion of a protocol cycle.

US Patent:

49146491, Apr 3, 1990

Filed:

Sep 12, 1988

Appl. No.:

7/243869

Inventors:

Robert J. Schwendeman - Pompano Beach FL
David F. Willard - Plantation FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 700

US Classification:

370 50

Abstract:

A multiple frequency message system includes a transmitter for transmitting coded message signals on a plurality of channels of which at least one channel to be assigned to each of a plurality of geographical areas. The coded message signals include channel identification information and message information being transmitted in a sequence of coded transmission slots on each of the plurality of channels. The sequence of coded transmission slots are transmitted offset in time such that a particular transmission slot is not simultaneously transmitted on any of the plurality of channels in each geographical area. A receiver capable of receiving the coded message signals during a predetermined coded transmission slot being transmitted on the plurality of channels is also provided. The receiver includes a channel selecting circuit responsive to the detected channel identification information during the predetermined transmission slot for maintaining operation on a predetermined channel or, for sequentially receiving the predetermined transmission slot on each of the plurality of channels.

US Patent:

62297945, May 8, 2001

Filed:

Aug 13, 1999

Appl. No.:

9/373652

Inventors:

David F. Willard - Plantation FL
Eric T. Eaton - Lake Worth FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 7212
H04L 700

US Classification:

370328

Abstract:

A selective call device (106) for monitoring at least two communication systems. The selective call device (106) has a receiver (204) for receiving information from a first communication system (110), a processor (206) for referencing a time slot assignment on the first communication system (110) to a common time base. The processor (206) calculates timing information relating a common time base and a transmitter (222) transmits the timing information to the second communication system (120) informing the second communication system (120) when to transmit information to the selective call device (106) with reference to the common time base.

US Patent:

56253516, Apr 29, 1997

Filed:

Jan 24, 1995

Appl. No.:

8/378136

Inventors:

David F. Willard - Plantation FL
Barbara D. Laflin - Ocean Ridge FL
William J. Kuznicki - Coral Springs FL
Mark Aronson - Boynton Beach FL
Eric T. Eaton - Lake Worth FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 726

US Classification:

34082552

Abstract:

A messaging system capable of transmitting messages to receivers which roam between coverage areas. In one configuration, a coverage area (100) is divided into a plurality of zones (110). A single simulcast system identification (SSID) number is assigned which consists of a local identification number which identifies the coverage area (100), a zone identifier which identifies a zone (110) within the coverage area, traffic splitting flags and a frequency. For larger roaming areas, a network (200) is defined as consisting of a plurality of service areas (210) and is identified by network roaming identification information (NRI). NRI information and/or SSID information is stored in a receiver according to desired coverage and like information is transmitted in the corresponding zone or service area.

US Patent:

44122179, Oct 25, 1983

Filed:

Sep 29, 1981

Appl. No.:

6/306800

Inventors:

David F. Willard - Plantation FL
Gerald W. Tidwell - Sunrise FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 504
H04M 1100
H04Q 900

US Classification:

34082544

Abstract:

A radio pager decoder including a register which is incremented when a page is received and a visual indicator which displays a count of the number of received pages. Pages may also be selectively retrieved from memory.

US Patent:

56868987, Nov 11, 1997

Filed:

Oct 20, 1995

Appl. No.:

8/546231

Inventors:

David Frank Willard - Plantation FL
Robert John Schwendeman - Pompano Beach FL
Michael Joseph DeLuca - Boca Raton FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 100

US Classification:

34082504

Abstract:

A method by which a data communication receiver may recognize a specific channel comprises the steps of receiving (1605) a data stream on a first channel for a first amount of time to determine (1680) whether network identification information is included in the data stream received on the first channel, wherein the network identification information comprises at least one address assigned to represent a network. If the network identification information is not included in the data stream received on the first channel within the first amount of time, reception is switched (1614) to receive (1605) a data stream on a second channel. The method further comprises the step of receiving (1605) the data stream on the second channel for a second amount of time to determine (1680) whether the network identification information is included in the data stream received on the second channel. If the network identification information is not included in the data stream received on the second channel within the second amount of time, reception is switched (1614) to receive (1605) a data stream on a third channel.

US Patent:

43852955, May 24, 1983

Filed:

Sep 29, 1981

Appl. No.:

6/306798

Inventors:

David F. Willard - Plantation FL
Gerald W. Tidwell - Sunrise FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 900
H04M 1102

US Classification:

34082544

Abstract:

A paper with a visual display comprises a radio receiver, means for identifying a desired recipient of signals on the radio receiver, means for storing a signal received on the receiver, means for displaying the number of messages received during a given interval, and means for display a plurality of messages received.

US Patent:

56109199, Mar 11, 1997

Filed:

Mar 30, 1995

Appl. No.:

8/413642

Inventors:

David F. Willard - Plantation FL
Eric T. Eaton - Lake Worth FL
Barbara D. Laflin - Ocean Ridge FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 708

US Classification:

370336

Abstract:

Network roaming information (NRI), which comprises identifies a network (200) and a service area (210) within the network (200), a receiver address, is transmitted in a network (200) during a predetermined number of time slots of a signal, whereby the signal is transmitted in consecutive cycles, each cycle comprising a plurality of consecutive time slots. The placement of the NRI in the transmitted signal is made to be predicted by a receiver so that the receiver can compute an expected time slot location of a NRI to be compared with a stored NRI. The placement of the NRI is made according to an algebraic relationship between moduloN of the transmission frequency of the signal, moduloN of the order of the cycle, and moduloN of a portion of the NRI, wherein N is an integer.