公开(公告)号：AU8007082A

公开(公告)日：1982-07-20

申请号：AU8007082

申请日：1981-12-17

Applicant: MOTOROLA INC

Inventor： ECKLUND LAWRENCE MARVIN

IPC: H04L27/00 ,  H04B5/00 ,  H04H1/00 ,  H04H20/49 ,  H04H20/88 ,  H04Q9/10 ,  H04H5/00

Abstract: A low frequency tone detector filters out higher frequencies, then a latching circuit locks on when a given number of low frequency cycles are detected which have at least a predetermined peak amplitude. Thereafter, only a second given number of missing or low amplitude cycles will reset the latch. The circuit is particularly suited to use with AM stereophonic signals where a low frequency tone is added to the difference channel for providing mono/stereo indication and mode switching. The circuit can also provide an early detect for use by a scanning circuit in a receiver.

公开(公告)号：IT8149344D0

公开(公告)日：1981-09-22

申请号：IT4934481

申请日：1981-09-22

Applicant: MOTOROLA INC

Inventor： ECKLUND LAWRENCE MARVIN

IPC: H03J3/12 ,  H03J

公开(公告)号：DE60001900D1

公开(公告)日：2003-05-08

申请号：DE60001900

申请日：2000-11-15

Applicant: MOTOROLA INC

Inventor： ECKLUND LAWRENCE MARVIN ,  BUCHWALD GREGORY J

IPC: H04B1/26 ,  H04B1/10 ,  H04B1/16

Abstract: A radio back-end circuit that includes a signal processing unit which receives an intermediate frequency signal containing modulated information. The radio back-end circuit processes the intermediate signal and provides an output representative of the modulated information. The radio back-end circuit includes a plurality of control registers for receiving digital information provided external to the back-end circuit. Also included is a signal optimization circuit, coupled to the plurality of registers, having an output coupled to the signal processing unit for modifying how the radio-back-end processes the intermediate frequency signal. In addition, an analog interface, coupled to the signal processing unit, is included which converts analog information from the signal processing unit to digital processing unit information.

公开(公告)号：AU1140688A

公开(公告)日：1988-10-20

申请号：AU1140688

申请日：1988-02-08

Applicant: MOTOROLA INC

Inventor： ECKLUND LAWRENCE MARVIN

IPC: H03J7/18 ,  H03D1/22 ,  H03J7/02 ,  H03J7/10 ,  H04B1/26 ,  H03L7/06

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.

公开(公告)号：IT1142870B

公开(公告)日：1986-10-15

申请号：IT4934481

申请日：1981-09-22

Applicant: MOTOROLA INC

Inventor： ECKLUND LAWRENCE MARVIN

IPC: H03J3/12 ,  H03J

公开(公告)号：MX151126A

公开(公告)日：1984-10-03

申请号：MX19179082

申请日：1982-03-12

Applicant: MOTOROLA INC

Inventor： ECKLUND LAWRENCE MARVIN ,  DRONG FRANK JR

IPC: H04H1/00 ,  H04H20/49 ,  H04B1/00

公开(公告)号：ZA818948B

公开(公告)日：1983-10-26

申请号：ZA818948

申请日：1981-12-28

Applicant: MOTOROLA INC

Inventor： ECKLUND LAWRENCE MARVIN

IPC: H01G20060101 ,  H03D20060101 ,  H03G20060101 ,  H04B20060101 ,  H01G ,  H03D ,  H03G ,  H04B

公开(公告)号：BR8108927A

公开(公告)日：1982-11-30

申请号：BR8108927

申请日：1981-12-17

Applicant: MOTOROLA INC

Inventor： ECKLUND LAWRENCE MARVIN

IPC: H04L27/00 ,  H04B5/00 ,  H04H1/00 ,  H04H20/49 ,  H04H20/88 ,  H04Q9/10 ,  H04H5/00

Abstract: A low frequency tone detector filters out higher frequencies, then a latching circuit locks on when a given number of low frequency cycles are detected which have at least a predetermined peak amplitude. Thereafter, only a second given number of missing or low amplitude cycles will reset the latch. The circuit is particularly suited to use with AM stereophonic signals where a low frequency tone is added to the difference channel for providing mono/stereo indication and mode switching. The circuit can also provide an early detect for use by a scanning circuit in a receiver.

公开(公告)号：IT8149970D0

公开(公告)日：1981-12-21

申请号：IT4997081

申请日：1981-12-21

Applicant: MOTOROLA INC

Inventor： ECKLUND LAWRENCE MARVIN

IPC: H04L27/00 ,  H04B5/00 ,  H04H1/00 ,  H04H20/49 ,  H04H20/88 ,  H04Q9/10 ,  H03D

Abstract: A low frequency tone detector filters out higher frequencies, then a latching circuit locks on when a given number of low frequency cycles are detected which have at least a predetermined peak amplitude. Thereafter, only a second given number of missing or low amplitude cycles will reset the latch. The circuit is particularly suited to use with AM stereophonic signals where a low frequency tone is added to the difference channel for providing mono/stereo indication and mode switching. The circuit can also provide an early detect for use by a scanning circuit in a receiver.

公开(公告)号：DE60001900T2

公开(公告)日：2003-11-06

申请号：DE60001900

申请日：2000-11-15

Applicant: MOTOROLA INC

Inventor： ECKLUND LAWRENCE MARVIN ,  BUCHWALD GREGORY J

IPC: H04B1/26 ,  H04B1/10 ,  H04B1/16

Abstract: A radio back-end circuit that includes a signal processing unit which receives an intermediate frequency signal containing modulated information. The radio back-end circuit processes the intermediate signal and provides an output representative of the modulated information. The radio back-end circuit includes a plurality of control registers for receiving digital information provided external to the back-end circuit. Also included is a signal optimization circuit, coupled to the plurality of registers, having an output coupled to the signal processing unit for modifying how the radio-back-end processes the intermediate frequency signal. In addition, an analog interface, coupled to the signal processing unit, is included which converts analog information from the signal processing unit to digital processing unit information.