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    RADIO COMMUNICATION RECEIVER WITH APPARATUS FOR ALTERING BIT RATE OF THE RECEIVER
    51.
    发明专利
    RADIO COMMUNICATION RECEIVER WITH APPARATUS FOR ALTERING BIT RATE OF THE RECEIVER 未知

    公开(公告)号：AU599613B2

    公开(公告)日：1990-07-26

    申请号：AU6524186

    申请日：1986-10-21

    Applicant: MOTOROLA INC

    Inventor： DAVIS WALTER LEE

    IPC: H04L25/02 ,  H04L25/38 ,  H04W8/24 ,  H04W88/02 ,  H04Q7/02 ,  H04L7/02 ,  H04B7/26 ,  H04B1/16

    Abstract: PCT No. PCT/US86/02199 Sec. 371 Date Nov. 4, 1986 Sec. 102(e) Date Nov. 4, 1986 PCT Filed Oct. 21, 1986 PCT Pub. No. WO88/03349 PCT Pub. Date May 5, 1988.A radio communication receiver decodes digital signals transmitted over a radio link and is capable of altering the bit rate of the receiver to match the bit rate transmitted form a remote location. The receiver includes a receiver portion 21 receiving radio signals and producing a received signal. A microporocessor 26 is used for decoding the received signal. The microprocessor (26) is responsive to a bit rate signal that is generated by a programmable divider (33). The microprocessor (26) is adpated to detect a predetermined code signal to alter the timing characteristic of the bit rate signal for generating a bit rate signal at a second rate for decoding received signals at a second bit rate designated by the predetermined code signal.

    INDUCTORLESS QUADRATURE DEMODULATOR
    53.
    发明专利
    INDUCTORLESS QUADRATURE DEMODULATOR 未知

    公开(公告)号：AU582191B2

    公开(公告)日：1989-03-16

    申请号：AU4862285

    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.

    55.
    发明专利
    未知

    公开(公告)号：NO882686D0

    公开(公告)日：1988-06-17

    申请号：NO882686

    申请日：1988-06-17

    Applicant: MOTOROLA INC

    Inventor： DAVIS WALTER LEE ,  NELSEON LEONARD EDWARD

    IPC: H04W8/24 ,  H04W88/02 ,  H04Q

    Abstract: A digital communications receiver is provided which is capable of receiving encoded signals transmitted over a radio link. The receiver is configurable such that it is capable of being commanded to receive signals exhibiting either a first ratio of information to parity or signals having a second ratio of information to parity. The receiver can also be commanded to receive signals having third or fourth ratios of information to parity. Thus the effective information throughput of the receiver can be increased upon command when desired.

    56.
    发明专利
    未知

    公开(公告)号：IT1172202B

    公开(公告)日：1987-06-18

    申请号：IT4939281

    申请日：1981-09-29

    Applicant: MOTOROLA INC

    Inventor： DAVIS WALTER LEE ,  KRAUL DOUGLAS ROBERT

    IPC: G11C17/00 ,  G11C5/00 ,  G11C8/00 ,  G11C8/10 ,  G11C11/34 ,  G11C11/40 ,  G11C11/413 ,  G06F

    Abstract: A memory system is used to store data and is powered-up by and only during accessing signals, thus using essentially no current when not being accessed. The memory system includes a decoding network using a mixture of NPN and PNP transistors, and a buffer circuit at the input to a memory cell array allows the use of a minimum number of select lines, having low power requirements.

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