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    TONE DETECTOR CIRCUIT
    12.
    发明申请
    TONE DETECTOR CIRCUIT 审中-公开
    音频检测电路

    公开(公告)号：WO1982002304A1

    公开(公告)日：1982-07-08

    申请号：PCT/US1981001693

    申请日：1981-12-17

    Applicant: MOTOROLA INC

    Inventor： MOTOROLA INC ,  ECKLUND LAWRENCE MARVIN

    IPC: H04H05/00

    CPC classification number: H04H20/49

    Abstract: Un detecteur de tonalite de basse frequence comprend un filtre (10) qui filtre des frequences elevees et un circuit de verrouillage (24) qui se verrouille lorsqu'un nombre donne de cycles de basse frequence est detecte, lesquels ont au moins une amplitude de crete predeterminee par des comparateurs (12, 14), une bascule (16), un registre a decalage (18) et des portes logiques (20, 22). Ensuite, seul un second nombre donne de cycles manquants ou de basse amplitude remettra a zero la bascule (24). La sortie de la bascule (24) fournit le signal de detection utilisable. Le circuit est particulierement approprie pour etre utilise avec des signaux stereophoniques de modulation d'amplitude ou une tonalite de basse frequence est ajoutee au canal differentiel pour produire une commutation d'indication et de mode mono/stereo. Le circuit peut egalement produire une detection de tonalite anticipee qu'un circuit d'analyse (23) utilise dans un recepteur.

    Abstract translation: 低频音检测器滤除较高频率，然后当检测到具有至少预定峰值振幅的给定数量的低频周期时，锁存电路锁定。 此后，只有第二个给定数量的丢失或低幅度周期将复位锁存器。 该电路特别适用于AM立体声信号，其中将低频音调添加到差分通道以提供单声道/立体声指示和模式切换。 电路还可以提供早期检测以供接收机中的扫描电路使用。

    PILOT TONE DETECTOR UTILIZING PHASE DEVIATION SIGNALS
    13.
    发明申请
    PILOT TONE DETECTOR UTILIZING PHASE DEVIATION SIGNALS 审中-公开
    使用相位偏差信号的引导音检测器

    公开(公告)号：WO1982003304A1

    公开(公告)日：1982-09-30

    申请号：PCT/US1982000254

    申请日：1982-03-01

    Applicant: MOTOROLA INC

    Inventor： MOTOROLA INC ,  ECKLUND LAWRENCE MARVIN ,  DRONG FRANK JR

    IPC: H04H05/00

    CPC classification number: H04H20/49

    Abstract: Une tonalite pilote stereophonique a modulation d'amplitude est detectee en utilisant deux signaux derives d'un signal d'emission recu. Un signal est proportionnel a la deviation de phase et l'autre est un signal a deux niveaux qui est une fonction de la valeur de la deviation de phase. Le detecteur commande l'actionnement de l'indicateur visuel (38), le reglage en silencieux du canal stereo de commutation en mode mono/stereo avec une elimination presque complete des fausses detections pendant une emission monophonique ou en cas de mauvaise reception d'une emission stereo.

    AUTOMATIC IF TANGENT LOCK CONTROL CIRCUIT
    16.
    发明专利
    AUTOMATIC IF TANGENT LOCK CONTROL CIRCUIT 未知

    公开(公告)号：HK11094A

    公开(公告)日：1994-02-09

    申请号：HK11094

    申请日：1994-02-02

    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.

    18.
    发明专利
    未知

    公开(公告)号：IT1195321B

    公开(公告)日：1988-10-12

    申请号：IT4934381

    申请日：1981-09-22

    Applicant: MOTOROLA INC

    Inventor： ECKLUND LAWRENCE MARVIN

    IPC: H04B1/26 ,  H03J7/00 ,  H03J7/02 ,  H03J7/06 ,  H04B1/10 ,  H03J

    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.

    19.
    发明专利
    未知

    公开(公告)号：IT1172184B

    公开(公告)日：1987-06-18

    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.

    TONE DETECTOR CIRCUIT
    20.
    发明专利
    TONE DETECTOR CIRCUIT 未知

    公开(公告)号：AU543433B2

    公开(公告)日：1985-04-18

    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 ,  H03H11/04 ,  H04S7/00

    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.

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