公开(公告)号：DE69119844D1

公开(公告)日：1996-07-04

申请号：DE69119844

申请日：1991-02-25

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS ,  WHITE RICHARD

IPC: H04L9/24 ,  H04L9/18 ,  H04L9/00

Abstract: An encryption circuit that operates with substantially zero delay. Using programmable keys and polynomials, the encryption algorithm can be constantly changed to thwart any unintended receiving parties from decoding the data. A key (101) and a polynomial (102) are loaded into registers. The key is then loaded into a shift register and shifted through XOR gates (106) at a programmable rate. The other input of the XOR gates come from the result of ANDing (103) a disable signal, the polynomial register (102), and the last stage of the shift register (104). Eight bits of the shift register outputs are XOR'ed with the input data to be encrypted. The output of these XOR gates (105) is the encrypted data.

公开(公告)号：NZ245191A

公开(公告)日：1993-06-25

申请号：NZ24519191

申请日：1991-03-04

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS

IPC: H04B7/185 ,  H04L12/66

公开(公告)号：HK18890A

公开(公告)日：1990-03-16

申请号：HK18890

申请日：1990-03-08

Applicant: MOTOROLA INC

Inventor： MILLEKER WILLIAM ,  FREEBURG THOMAS ,  STEPIEN MICHAEL

IPC: H03G3/34 ,  H04B7/26 ,  H04J3/24 ,  H04B1/10

Abstract: Data muting apparatus is described that mutes variable-length data signals communicated between a central station and mobile and portable radios in a dispatch radio communications system. The central station includes a base station transceiver, a dispatcher console, a general communications controller (GCC), a digital communications computer and a display terminal. The base station transmitter and receiver communicate over an RF duplex channel to the transceiver of the mobile and portable radios. The dispatcher console provides for voice communications and is coupled by a transmit signal line and a receive signal line to the base station transceiver. The GCC provides for data communications and is also coupled to the transmit signal line and is interposed between the dispatcher console and the base station transceiver in the receive signal line. The GCC and mobile and portable radios include data muting apparatus enbodying the present invention. The data muting apparatus includes a detector for detecting the presence of a carrier signal and muting circuitry for muting the transceiver output for a predetermined time interval when a carrier signal has been detected. During the predetermined time interval, other circuitry may detect a synchronization word in a received data signal and mute the receiver output until still other circuitry detects the last bit of a following information word in the received data signal and unmutes the transceiver output. Thus, data signals at the beginning of each communication are muted without impairing voice communications.

公开(公告)号：AU2002320029A1

公开(公告)日：2003-03-03

申请号：AU2002320029

申请日：2002-05-06

Applicant: MOTOROLA INC

Inventor： OOMS WILLIAM J ,  FREEBURG THOMAS ,  PRENDERGAST JAMES E ,  RAMDANI JAMAL ,  DROOPAD RAVINDRANATH ,  EISENBEISER KURT W

IPC: H01L21/20 ,  H01L29/04 ,  H01L31/036 ,  H01L31/0376 ,  H01L31/0687 ,  H01L31/0693 ,  H01L31/18 ,  H01L31/068

Abstract: Multijunction solar cell structures (100) including high quality epitaxial layers of monocrystalline semiconductor materials that are grown overlying monocrystalline substrates (102) such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers are disclosed. One way to achieve the formation of a compliant substrate includes first growing an accommodating buffer layer (104) on a silicon wafer. The accommodating buffer (104) layer is a layer of monocrystalline material spaced apart from the silicon wafer by an amorphous interface layer (112) of silicon oxide. The amorphous interface layer (112) dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. Multiple and varied accommodating buffer layers can be used to achieve the monolithic integration of multiple non-lattice matched solar cell junctions.

公开(公告)号：DE69033007D1

公开(公告)日：1999-04-22

申请号：DE69033007

申请日：1990-12-03

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS ,  KACZMARCZYK JOHN ,  BUCHHOLZ DALE ,  WHITE RICHARD ,  CHANG HUNGKUN ,  NOLAN MICHAEL

IPC: H04L12/54 ,  H04J3/24 ,  H04Q11/04 ,  H04Q7/00 ,  H04L29/06

Abstract: In this invention a hierarchical addressing technique is employed in a packet communications system to enhance flexibility in handling packet information. This method permits packet message data (Fig. 3) and certain packet control data (Fig. 3) to be stored in memory locations (32, 34) without having to be duplicated at a different memory location prior to transmission of the packet. This method is preferably employed in a ring configuration in which a series of packets have addressing mechanisms which points sequentially to each other to form a ring of packets.

公开(公告)号：DE69129938D1

公开(公告)日：1998-09-10

申请号：DE69129938

申请日：1991-03-01

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS

IPC: H04B7/204 ,  H04B7/185 ,  H04Q7/38 ,  H04B7/19

Abstract: There is provided a mechanism for networking satellite and terrestrial networks. It comprises: maintaining subscriber-received power levels of terrestrial network transmissions about one order of magnitude above co-channel satellite transmissions to overcome interference and maintaining subscriber transmissions to terrestrial networks at power levels about one order of magnitude of the below co-channel transmissions to satellite networks to avoid causing interference at the satellite. Such power level maintenance is provided by the network in communication with such subscriber. Moreover, a non-orbiting ("grounded") satellite cooperates as a switching node of both the satellite network and a terrestrial network to relay information between a terrestrial subscriber and the satellite radiotelephone network over a terrestrial network. The terrestrial network and the satellite network may communicate via either the inter-satellite spectrum or the terrestrial-to-satellite spectrum.

公开(公告)号：BR9505869A

公开(公告)日：1996-02-21

申请号：BR9505869

申请日：1995-02-06

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS ,  JACKSON IRVIN ,  LEY JOHN

IPC: H03D3/06 ,  H03D3/22 ,  H04B1/10

公开(公告)号：EP0094420A4

公开(公告)日：1985-07-01

申请号：EP83900135

申请日：1982-11-12

Applicant: MOTOROLA INC

Inventor： MILLEKER WILLIAM ,  FREEBURG THOMAS ,  STEPIEN MICHAEL

IPC: H04B1/10 ,  H03G3/34 ,  H04B7/26 ,  H04J3/24 ,  H04J6/00

CPC classification number: H03G3/34

Abstract: Apparatus that mutes data signals communicated between a central station (100) and mobile (120) and portable radios (122) in a dispatch radio system. The centraL station (100) includes a base station (110) having an RF transmitter and RF receiver, a dispatcher console (102), a general communications controller (GCC), (104), a digital communications computer (108) and a display terminal (106). The dispatcher console provides for voice communications. The GCC (104) provides for data communications. The GCC (104) and mobile (120) and portable radios (122) include data muting apparatus embodying the present invention. The data muting apparatus includes a noise detector (210, 602) for detecting the presence of a carrier signal and muting circuitry (220, 606) for muting the receiver output for a predetermined time interval when a carrier signal has been detected. During the predetermined time interval, other circuitry (620) may detect a synchronization word in a received data signal and mute the receiver output until still other circuitry (626) detects the last bit of a following information work and unmutes the receiver output.