公开(公告)号：NO950765A

公开(公告)日：1995-02-28

申请号：NO950765

申请日：1995-02-28

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER LEE

IPC: H04B1/10

公开(公告)号：MY104245A

公开(公告)日：1994-02-28

申请号：MYPI19891443

申请日：1989-10-19

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER LEE

IPC: H04B1/16 ,  H04B20060101 ,  H04W52/02 ,  H04W88/02

Abstract: A RECEIVER (70) RECEIVES A TRANSMITTED SIGNAL (10) HAVING A PERIODIC PREDETERMINED SIGNAL (12), A METHOD AND APPARATUS DETECTS A FIRST PREDETERMINED SIGNAL (12A). POWER MAY BE CONSERVED DURING A PORTION OF A SUBSEQUENT PREDETERMINED SIGNAL (12B). THE SUBSEQUENT PREDETERMINED SIGNAL IS DIVIDED INTO AT LEAST A FIRST (212A) AND SECOND PORTION (212B). IF THE FIRST PORTION IS DETECTED, THE SUBSEQUENT PREDETERMINED SIGNAL IS CONSIDERED DETECTED AND POWER IS CONSERVED FOR THE SECOND PORTION (252). IF THE FIRST PORTION IS NOT DETECTED, THE RECEIVER REMAINS ACTIVE FOR THE SECOND PORTION IN ORDER TO DETECT THE SUBSEQUENT PREDETERMINED SIGNAL (254). (FIG. 2)

公开(公告)号：DE3177280D1

公开(公告)日：1992-06-17

申请号：DE3177280

申请日：1981-08-31

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER LEE ,  RAGHUNATHAN KUPUSWAMY

IPC: G06F9/22 ,  G08B3/10 ,  H04B1/16 ,  H04B5/04 ,  H04L7/033 ,  H04L7/04 ,  H04Q1/39 ,  H04W8/24 ,  H04W88/02 ,  H04Q7/02

Abstract: An battery powered, adaptive signal decoder is disclosed which is capable of processing detected encoded signals in accordance with a plurality of decoding schemes. The decoder has an equivalent microcomputer implementation. Energy conservation means operating independently of the detected signals acts to conserve the energy of the battery.

公开(公告)号：DE3584890D1

公开(公告)日：1992-01-23

申请号：DE3584890

申请日：1985-09-19

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER LEE ,  PRIETO YOLANDA

IPC: H03D3/06 ,  H03D3/02 ,  H03D3/20

Abstract: An inductorless quadrature demodulator for frequency modulated signals is disclosed. A limited FM signal is passed through an active filter (26) and a phase shift network (30) to produce a quadrature signal. The limited FM signal is compared with the quadrature signal in an EXCLUSIVE OR gate (24) and then low pass filtered (36) to obtain recovered audio. The active filter (26) includes a transconductance amplifier (60) whose center frequency can be adjusted by appropriate adjustment of the amplifier's bias current. The bias current is temperature compensated to allow operation of the demodulator over a wide temperature range.

公开(公告)号：AT70395T

公开(公告)日：1991-12-15

申请号：AT85904762

申请日：1985-09-19

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER LEE ,  PRIETO YOLANDA

IPC: H03D3/06 ,  H03D3/02 ,  H03D3/20

Abstract: An inductorless quadrature demodulator for frequency modulated signals is disclosed. A limited FM signal is passed through an active filter (26) and a phase shift network (30) to produce a quadrature signal. The limited FM signal is compared with the quadrature signal in an EXCLUSIVE OR gate (24) and then low pass filtered (36) to obtain recovered audio. The active filter (26) includes a transconductance amplifier (60) whose center frequency can be adjusted by appropriate adjustment of the amplifier's bias current. The bias current is temperature compensated to allow operation of the demodulator over a wide temperature range.

公开(公告)号：AU6427990A

公开(公告)日：1991-05-31

申请号：AU6427990

申请日：1990-09-12

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER LEE ,  MACNAK PHILIP PAUL

IPC: H04B7/15 ,  H04B20060101 ,  H04B7/185 ,  H04L29/06 ,  H04W84/02

Abstract: A satellite paging system is described for providing geogrpahic protocol conversion for data packet delivery to communication receivers located in a plurality of geographic areas. The system includes a transmitter for transmitting data packets formatted in a first predetermined data format to the communication satellite. The satellite includes a receiver for receiving the data packets and a programmable encoder coupled to the receiver for encoding the received data packets into encoded data packets in a second predetermined data format corresponding to the signaling requirements of each geographic delivery area. A satellite transmitter coupled to the programmable encoder then transmits the encoded data packets in the second predetermined data format to a portable communication receiver, operable in the second predetermined data format in the geographic delivery area.

公开(公告)号：NO911997L

公开(公告)日：1991-05-24

申请号：NO911997

申请日：1991-05-24

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER LEE

IPC: H04B20060101 ,  H04B1/16 ,  H04W52/02 ,  H04W88/02

Abstract: A receiver (70) receives a transmitted signal having a periodic predetermined signal, a method and apparatus (99) detects a first predetermined signal. Power may be conserved during a portion of a subsequent predetermined signal. The subsequent predetermined signal is divided into at least a first and second portion. If the first portion is detected, the subsequent predetermined signal is considered detected and power is conserved for the second portion. If the first portion is not detected, the receiver remains active for the second portion in order to detect the subsequent predetermined signal.

公开(公告)号：NO911997A

公开(公告)日：1991-05-24

申请号：NO911997

申请日：1991-05-24

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER LEE

IPC: H04B1/16 ,  H04B20060101 ,  H04W52/02 ,  H04W88/02

CPC classification number: H04W52/0229 ,  H04W88/022 ,  Y02D70/00

Abstract: A receiver (70) receives a transmitted signal having a periodic predetermined signal, a method and apparatus (99) detects a first predetermined signal. Power may be conserved during a portion of a subsequent predetermined signal. The subsequent predetermined signal is divided into at least a first and second portion. If the first portion is detected, the subsequent predetermined signal is considered detected and power is conserved for the second portion. If the first portion is not detected, the receiver remains active for the second portion in order to detect the subsequent predetermined signal.

公开(公告)号：FI912495A0

公开(公告)日：1991-05-22

申请号：FI912495

申请日：1991-05-22

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER LEE

IPC: H04B1/16 ,  H04B20060101 ,  H04W52/02 ,  H04W88/02 ,  H04B

Abstract: A receiver (70) receives a transmitted signal having a periodic predetermined signal, a method and apparatus (99) detects a first predetermined signal. Power may be conserved during a portion of a subsequent predetermined signal. The subsequent predetermined signal is divided into at least a first and second portion. If the first portion is detected, the subsequent predetermined signal is considered detected and power is conserved for the second portion. If the first portion is not detected, the receiver remains active for the second portion in order to detect the subsequent predetermined signal.

公开(公告)号：AU2940689A

公开(公告)日：1989-08-01

申请号：AU2940689

申请日：1989-12-09

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER LEE

IPC: G08B5/22 ,  H04B7/26 ,  H04W8/24 ,  H04W88/02 ,  H04Q7/00

Abstract: A digital selective call receiver is modified to enhance the address decoding capability by providing access to received data, bit and frame synchronization signals, and a detect input terminal of an annunciator. A selectively attachable additional independent address decoding device including additional memory and an independent address decoder operating in parallel with the decoder in the selective call receiver is attached to the receiver for accessing the various signals and providing a detect signal to the annunicator when an additional independent address is decoded.