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公开(公告)号：JP2001186032A
公开(公告)日：2001-07-06
申请号：JP2000347431
申请日：2000-11-15
Applicant: MOTOROLA INC
Inventor： ECKLUND LAWRENCE MARVIN , BUCHWALD GREGORY J
Abstract: PROBLEM TO BE SOLVED: To provide a wireless back end circuit that includes a signal processing unit to receive an intermediate frequency signal which includes information to be modulated. SOLUTION: The wireless back end circuit processes an intermediate frequency signal and provides the output of the information to be modulated. The wireless back end circuit includes a plurality of control registers and receives digital information given from the outside of the wireless back end circuit. Furthermore, the wireless back end circuit includes a signal optimizing circuit, which has an output that is coupled with a signal processing unit and the registers to revise how to process the intermediate frequency signal by the wireless back end. Moreover, the wireless back end circuit includes an analog interface coupled with the signal processing unit and converts analog information from the signal processing unit into information for a digital processing unit.
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公开(公告)号：JPS57502035A
公开(公告)日：1982-11-11
申请号：JP50046482
申请日：1981-12-17
Applicant: MOTOROLA INC
Inventor： ECKLUND LAWRENCE MARVIN
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公开(公告)号：JP2001189669A
公开(公告)日：2001-07-10
申请号：JP2000347430
申请日：2000-11-15
Applicant: MOTOROLA INC
Inventor： ECKLUND LAWRENCE MARVIN , BUCHWALD GREGORY J
Abstract: PROBLEM TO BE SOLVED: To provide a radio back end circuit provided with an integration circuit and a first variable voltage converting circuit having a signal input coupled with the output of the integration circuit. SOLUTION: This circuit is provided with a first variable low-pass filter, a second variable voltage converting circuit and a variable attenuator. These members of the radio back end circuit are coupled so as to communicate, noises are reduced in radio communication and the control of signals and of a receiving range is improved on certain fixed conditions.
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公开(公告)号：JPH0570337B2
公开(公告)日：1993-10-04
申请号：JP50046482
申请日：1981-12-17
Applicant: MOTOROLA INC
Inventor： ECKLUND LAWRENCE MARVIN
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公开(公告)号：CA2100444C
公开(公告)日：1998-11-24
申请号：CA2100444
申请日：1992-02-04
Applicant: MOTOROLA INC
Inventor： ECKLUND LAWRENCE MARVIN
Abstract: An improved AM-FM combined stereo receiver (100) is provided having a single pro cessor (155) for removing, in the FM mode, arc tangent distortion, and in the AM mode, to process the phase term from arc tangent ¢L - R / 1 + L + R! to determine ¢L - R / 1 + L + R!. Further, the radio includes a single discriminator circuit (161, 137, 139) wherein, in the FM mode, the discriminator tank circuit (137, 139) is used to convert frequency deviation to baseband audio and, in the AM mode, the discriminator tank circuit is used as the frequency-determining element for the voltage contro lled oscillator (VCO) (161), the VCO being used to translate the intermediate frequency (IF) signal to baseband.
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Patent Agency Ranking
公开(公告)号：GB2203908A
公开(公告)日：1988-10-26
申请号：GB8803777
申请日：1988-02-18
Applicant: MOTOROLA INC
Inventor： ECKLUND LAWRENCE MARVIN
Abstract: An improved radio receiver that maintains a stable predetermined IF frequency upon receipt of input carrier signals of differing frequencies. The IF signal (14) is processed through a signal demodulation unit (16) that includes a tangent processing unit (22) to yield a control signal that varies as a tangent function of both the demodulated IF signal and a reference signal from a reference oscillator (17). This control signal is used to control the frequency and phase of a reference signal (26) used by the IF stage (12) to center the IF signal with respect to the IF stage characteristics.
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公开(公告)号：ZA8108948B
公开(公告)日：1983-10-26
申请号：ZA8108948
申请日：1981-12-28
Applicant: MOTOROLA INC
Inventor： ECKLUND LAWRENCE MARVIN
IPC: H01G20060101 , H03D20060101 , H03G20060101 , H04B20060101 , H01G , H03D , H03G , H04B
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公开(公告)号：IT8149343D0
公开(公告)日：1981-09-22
申请号：IT4934381
申请日：1981-09-22
Applicant: MOTOROLA INC
Inventor： ECKLUND LAWRENCE MARVIN
Abstract: A mechanical radio receiver tuner with microphonics elimination circuitry is disclosed. During a mechanical tuning mode, the mechanical position of a movable tuning element provides an associated adjustable reactance which determines a control voltage for controlling the output of a voltage controlled oscillator (VCO) that serves as the local oscillator for a superheterodyne radio receiver. After initially selecting a channel frequency by adjusting the output of the VCO with the mechanically movable tuning element in the tuning mode, a switch means disconnects the movable tuning element from operative control of the local oscillator frequency and implements a locked tuning mode by providing the VCO with a control voltage related to the difference between the frequency of the output signal of a mixer stage and the center frequency of a fixed tuned narrow passband IF stage that follows the mixer. Preferably, this control voltage for the locked tuning mode is provided by a phase locked loop. When substantial changes in the reactance provided by the movable tuning element are sensed, the switching circuit reimplements the tuning mode so that the position of the mechanically movable element will once again control the output of the local oscillator. In this manner, minor changes in the mechanical position of the movable tuning element during the locked tuning mode have no effect on receiver tuning and therefore microphonics are substantially eliminated.
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公开(公告)号：AU594286B2
公开(公告)日：1990-03-01
申请号：AU1140688
申请日：1988-02-08
Applicant: MOTOROLA INC
Inventor： ECKLUND LAWRENCE MARVIN
Abstract: An improved radio receiver that maintains a stable predetermined IF frequency upon receipt of input carrier signals of differing frequencies. The IF signal (14) is processed through a signal demodulation unit (16) that includes a tangent processing unit (22) to yield a control signal that varies as a tangent function of both the demodulated IF signal and a reference signal from a reference oscillator (17). This control signal is used to control the frequency and phase of a reference signal (26) used by the IF stage (12) to center the IF signal with respect to the IF stage characteristics.
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公开(公告)号：AU585461B2
公开(公告)日：1989-06-15
申请号：AU7780587
申请日：1987-07-20
Applicant: MOTOROLA INC
Inventor： ECKLUND LAWRENCE MARVIN
Abstract: In a radio having an in phase multiplier (A) for providing an in phase detected signal, a detection unit for receiving this signal and for determining whether this signal includes any negative polarity components which would indicate that a viable broadcast signal does not exist on the incoming frequency of interest. This detection unit can include a comparator (11) for comparing the incoming signal against a selected reference value. The invention can also include a signal quality evaluation unit (58) for providing either a digital or analog quality signal that can also effect the output and be used by appropriate processing circuitry to further refine the channel selection process.
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