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    RECEIVER FOR COMPATIBLE AM STEREO SIGNALS
    42.
    发明授权
    RECEIVER FOR COMPATIBLE AM STEREO SIGNALS 失效

    公开(公告)号：KR820001333B1

    公开(公告)日：1982-07-23

    申请号：KR780002945

    申请日：1978-09-27

    Applicant: MOTOROLA INC

    Inventor： HILBERT F ,  PARKER N

    IPC: H04H1/00 ,  H04H40/36 ,  H04H5/00

    Abstract: The AM receiver comprises an input stage(11, 12) for receiving the compatible stereo signal of (I+L+R)cos(Wct+0) and translating the signal to an intermediate frequency signal. A detector(16) is coupled to the input stage for providing the output signal which is proportional to the (L-R)cos. A corrector circuit(17, 22, 23, 25) which is coupled to the detector(16) provides a correctional signal for use in restoring exact sum and difference signals.

    BALL BEARING CAM ASSEMBLY
    43.
    发明授权
    BALL BEARING CAM ASSEMBLY 失效

    公开(公告)号：KR820000465B1

    公开(公告)日：1982-04-03

    申请号：KR770001301

    申请日：1977-06-01

    Applicant: MOTOROLA INC

    Inventor： DATTILO D

    IPC: F16H53/04

    Abstract: The cam assembly for a multi-track tape player recorder is rotatable to cause a cam follower(23) to assume different presselected positions. The follower adjusts the position of a magnetic tape head(11) relative to a tape to select a given tape track for sensing by the head. The cam assembly(10) includes a disc of variable thickness but constant radius within which ball bearings of different dia. are housed. Each ball is located in a recess in the cam and, when moved to an operative position, determines the position of the follower by virtue of its dia.

    TRANSMITTER MODULATION LIMITER
    44.
    发明授权
    TRANSMITTER MODULATION LIMITER 失效

    公开(公告)号：KR820000314B1

    公开(公告)日：1982-03-19

    申请号：KR770000072

    申请日：1977-01-14

    Applicant: MOTOROLA INC

    Inventor： BETHARDS CHARLES W

    IPC: H04B1/04

    Abstract: A resistor is inserted between the audio signal and the primary winding of a modulating transformer used in an amplitude modulated transmitter. The value of the resistor is selected to limit the peak signals into a transformer thereby limiting the peak instantaneous index of modulation to less than 100%. A capacitor, coupled to the transformers secondary winding, forms a low pass filter with the impedance of the resistor as transformed by the turns ratio of the transformer. The resulting low pass filter attenuates undesired harmonics.

    BLANKING CIRCUIT FOR A RADIO RECEIVER
    45.
    发明授权
    BLANKING CIRCUIT FOR A RADIO RECEIVER 失效

    公开(公告)号：KR810001859B1

    公开(公告)日：1981-11-17

    申请号：KR770000581

    申请日：1977-03-11

    Applicant: MOTOROLA INC

    Inventor： RAE J ,  ANDREWS J

    IPC: H04B1/10

    Abstract: The blanking cct. (10) includes a filter(32) which attenuates signals in the selected information passband of the receiver, and a sampling passband is chosen which contains the same noise signals that are found in the information passband. The filter is coupled to the portion of the receiver which receives radio signals prior to the circuitry which selects the information passband of frequencies. The signals passed by the filter are processed to generate blanking signals in response to the filtered signals.

    RECEIVE
    46.
    发明授权
    RECEIVE 失效

    公开(公告)号：KR810000345B1

    公开(公告)日：1981-04-20

    申请号：KR770000844

    申请日：1977-04-07

    Applicant: MOTOROLA INC

    Inventor： PARKER N ,  HILBERT P

    IPC: H04H1/00 ,  H04H40/36 ,  H04H5/00

    Abstract: The improved compatible AM stereophonic receiver has the parts for providing compensation signals proportioning the angle &phgr;. The parts comprises a limiter(34) for limiting the amplitude modulation components of the output signals(66b) of the amplifier(65), a multiplier(35) for multiplying the outputs of limiter(34) and phase shifter(73) for shifting the output of VCO(36) and a compensation cct(37). The outputs of the phase shifter(73) and the multiplier(35) are applied to the compensation cct(37). The outputs(95) of the compensation cct., whose value is divided the reference voltage output from the VCO(36) by cos&phgr;, is applied to the input stages of phase shifter(38)(39).

    HIGH POWER PIEZOELECTRIC BENDER
    47.
    发明授权
    HIGH POWER PIEZOELECTRIC BENDER 失效

    公开(公告)号：KR800000939B1

    公开(公告)日：1980-09-12

    申请号：KR760003106

    申请日：1976-12-16

    Applicant: MOTOROLA INC

    Inventor： SCHAFFT H

    IPC: H01L41/04

    Abstract: A bimorph bender(10) for driving a mechanical member, reliably handling high power levels & maintaining a high electromechanical coupling factor comprises a pair of circular piezoelectric discs(12, 14) each one of which has a central coupling hole(22, 24), electrodes(16, 18) contiguous with the surfaces of each disc, & a center vane(20) spacing the discs & aligning the hales to form a coupling cavity. A high stiffness insulating washer(26) is fixed in the cavity to the hole surface(22, 24) of each disc by alumina-filled epoxy cement & maintains a high mechanical stress force across the bender.

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