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公开(公告)号：CA1281078C
公开(公告)日：1991-03-05
申请号：CA588317
申请日：1989-01-16
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A , DAUTEL DONALD F
Abstract: CE00335H A unique cellular data telephone system includes a cellular telephone system (CTS 150), a cellular data switch (CDS 170), and a telephone central office (130) for providing both voice and data telephone services to portable and mobile cellular data telephones (CDTs 102, 122) located anywhere in a large geographical area. Each of the CDTs (102, 122) includes a data control unit (DCU 106), a cellular modem (162) and a cellular telephone (108) and associated antenna (110), and connects to a data terminal (104, 124) with keyboard and display. DCU (106) includes memory (302) for storing a CDS telephone number and CDT telephone number, microcomputer (304) with internal memory for controlling data communications between cellular modem (162) and data terminal (104), a dual tone multifrequency ("DTMF") encoder (306) for encoding telephone numbers and control signals, a DTMF decoder (314) for decoding DTMF telephone digits and/or DTMF control tones, a buffer (312) for storing transmit data from data terminal (104), and analog switches (308, 310) for coupling DTMF encoder (306) and buffer (312) to the transmit data Td signal to cellular modem (162). If data terminal (104) is inactive for a predetermined time interval, DCU (106) automatically disconnects the cellular telephone call while maintaining the landline telephone call to a data host (140, 141). Once data is transmitted again by data terminal (104), DCU (106) automatically places another cellular telephone call and is reconnected to the landline telephone call.
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公开(公告)号：AU5543690A
公开(公告)日：1991-01-07
申请号：AU5543690
申请日：1990-04-23
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A
Abstract: There is provided a scheme for bit error rate detection. It is characterised by: detecting the bit value present in a received multi-level signal (102), more narrowly detecting the bit value present in that received multi-level signal (104), comparing the results of narrow detection with the results detected otherwise to identify errors in detection (203, 206, 207 and 209), and accumulating detected symbol errors over unit time. Bit error rate detection can be used for antenna selection-selecting one of a plurality of diversity antennas when the error rate exceeds (213) a certain error threshold.
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公开(公告)号：CA2032164A1
公开(公告)日：1990-12-01
申请号：CA2032164
申请日：1990-04-16
Applicant: MOTOROLA INC
Inventor： ROHRET PAUL J , FREEBURG THOMAS A , MUNIER SCOTT D
Abstract: 2032164 9015453 PCTABS00002 An antenna is disclosed for increasing the gain of, or shaping the pattern of, a radiated radio frequency signal. The antenna includes a waveguide (10) for directing the radio frequency signal or for receiving directively the radio signal, a first conductive reflector (22) disposed beneath the waveguide (10) and extending beyond the aperture of the waveguide for reflecting certain of the waves emanating from or entering the aperture of the waveguide, and a second reflector (16), which may be the mounting surface, disposed beneath the first reflector (22) and extending beyond the first reflector (22) for reflecting other of the waves emanating from or entering the aperture of the waveguide (10).
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公开(公告)号：CA1226625A
公开(公告)日：1987-09-08
申请号：CA509687
申请日：1986-05-21
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A
IPC: H04B7/24
Abstract: A data communications sustem (Figure 1) is described that covers a geographic area divided into a plurality of non-overlapping zones (Figure 2) and includes a general communications controller (GCC, 104), a plurality of channel communications modules (CCM 106, 108, 110, 112) and associated transmitters (114, 120, 124) and receivers (116, 118, 122, 126, 128), and a plurality of portable radios (130, 132, 134). Message signals carrying alphanumeric information are communication between the GCC (104) and the portable radios (130, 132, 134) by way of a radio channel. Each CCM (106, 108, 110, 112) takes a signal strength measurement every time it receives a message signal from a portable radio (130, 132 or 134). The GCC (104) gathers the signal strength measurements from the CCM receivers (116, 118, 122, 126, 128) receiving the same message signal and computes an adjusted signal strength for each zone. The GCC (104) then selects the zone having the largest adjusted signal strength for determining the location of the portable radio (130, 132 or 134) that transmitted the message signal. Whenever the GCC (104) transmits a message signal to a portable radio, the CCM transmitter (114, 120, 124) is used that covers the zone having the largest adjusted signal strength for the last transmission from that portable radio (130, 132, 134) in other zones using non-interfering CCM transmitters (114, 120, 124), information throughput is greatly enhanced.
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公开(公告)号：CA1217234A
公开(公告)日：1987-01-27
申请号：CA433332
申请日：1983-07-27
Applicant: MOTOROLA INC
Inventor： BURKE TIMOTHY M , NOBLE SCOTT W , FREEBURG THOMAS A , KREBS JAY R
Abstract: A data signalling system for transmitting signals between at least one primary station (50,52) and a plurality of secondary stations (60,62,64). The system is well adapted for use in multiple unit radio communications systems capable of voice and data communications. A register model is utilized which permits a highly flexible signalling system compatable with a wide range of communications networks. Data transfer is accomplished using fixed length data packets 74 which are error correction encoded and transmitted utilizing PSK modulation.
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Patent Agency Ranking
公开(公告)号：MY129991A
公开(公告)日：2007-05-31
申请号：MYPI9100348
申请日：1991-03-06
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A
Abstract: THERE IS PROVIDED A MECHANISM FOR NETWORKING SATELLITE (301-303) AND TERRESTINAL NETWORKS (310, 312,-315). IT COMPRISES: MAINTAINING SUBSCRIBER-RECEIVED POWER LEVELS OF TERRESTRIAL NETWORK TRANSMISSIONS (340, 341, 360) ABOUT ONE ORDER OF MAGNITUDE ABOVE CO-CHANNEL SATELLITE TRANSMISSIONS (305, 306, 320, 365) TO OVERCOME INTERFERENCE AND MAINTAINING SUBSCRIBER TRANSMISSIONS (340, 341, 360) TO TERRESTRIAL NETWORKS (310, 312-315) AT POWER LEVELS ABOUT ONE ORDER OF MAGNITUDE OF THE BELOW CO-CHANNEL TRANSMISSIONS TO SATELLITE NETWORKS (301-303) TO AVOID CAUSING INTERFERENCE AT THE SATELLITE (302).SUCH POWER LEVEL MAINTENANCE IS PROVIDED BY THE NETWORK IN COMMUNICATION WITH SUCH SUBSCRIBER (330-333). MOREOVER, A NON-ORBITING ("GROUNDED") SATELLITE (311) COOPERATES AS A SWITCHING NODE OF BOTH THE SATELLITE NETWORK (301-303) AND A TERRESTRIAL NETWORK (310, 312-315) TO RELAY INFORMATION BETWEEN A TERRESTRIAL SUBSCRIBER (331, 333) AND THE SATELLITE RADIOTELEPHONE NETWORK (301-303) OVER A TERRESTRIAL NETWORK (310, 312-315). THE TERRESTRIAL NETWORK (310, 312-315) AND THE SATELLITE NETWORK (301-303) MAY COMMUNICATE VIA EITHER THE INTER-SATELLITE SPECTRUM OR THE TERRESTRIAL-TO-SATELLITE SPECTRUM.(FIG. 2)
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公开(公告)号：AU6339801A
公开(公告)日：2002-01-14
申请号：AU6339801
申请日：2001-05-21
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A , GRUBE GARY W
IPC: H01L21/8258 , H01L27/06
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公开(公告)号：DE69226886D1
公开(公告)日：1998-10-15
申请号：DE69226886
申请日：1992-01-16
Applicant: MOTOROLA INC
Inventor： DUCH KRZYSTOF , FREEBURG THOMAS A
Abstract: An apparatus scales binary samples representing a predetermined waveform (109) to achieve every possible transition in a multi-level transmission system. The predetermined waveform (109) is partitioned into M symbol intervals, each symbol interval having a corresponding waveform represented by a series of binary samples V stored in M separate ROM devices (311-316). Depending on the required amplitude and polarity of the transition, logic blocks (351-356) control scaling multipliers (321-326) and polarity multipliers (331-336) to perform the required scaling and inverting of the binary samples retrieved from ROM (311-316). The scaled and inverted samples are added together by an adder (345) and sent to a D/A converter (350) where the desired scaled and inverted waveform is converted/generated from the scaled and inverted binary samples.
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公开(公告)号：ES2104584T3
公开(公告)日：1997-10-16
申请号：ES90305868
申请日：1990-05-30
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A
Abstract: There is provided a scheme for bit error rate detection. It is characterised by: detecting the bit value present in a received multi-level signal (102), more narrowly detecting the bit value present in that received multi-level signal (104), comparing the results of narrow detection with the results detected otherwise to identify errors in detection (203, 206, 207 and 209), and accumulating detected symbol errors over unit time. Bit error rate detection can be used for antenna selection-selecting one of a plurality of diversity antennas when the error rate exceeds (213) a certain error threshold.
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公开(公告)号：FI97516C
公开(公告)日：1996-12-27
申请号：FI891275
申请日：1989-03-17
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A , DAUTEL DONALD F
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