公开(公告)号：US3962649A

公开(公告)日：1976-06-08

申请号：US538557

申请日：1975-01-06

Applicant: Martin Fischman ,  Edward I. Zmuda

Inventor： Martin Fischman ,  Edward I. Zmuda

IPC: H03D3/16

CPC classification number: H03D3/16

Abstract: A frequency discriminator utilizing a surface wave device is described wherein threshold means are used to suppress spurious responses due to the side lobes and other parasitic effects of the surface wave device.

Abstract translation: 描述了利用表面波器件的鉴频器，其中使用阈值装置来抑制由于旁波的寄生响应和表面波器件的其他寄生效应。

公开(公告)号：US3936751A

公开(公告)日：1976-02-03

申请号：US503943

申请日：1974-09-05

Applicant: Jerry D. Holmes ,  Benjamin L. Lowe ,  Samuel D. Moore

Inventor： Jerry D. Holmes ,  Benjamin L. Lowe ,  Samuel D. Moore

IPC: H03D3/16 ,  H04B1/16

CPC classification number: H03D3/16

Abstract: An SWD structure is employed in an FM receiver for signal demodulation and band limiting. An FM signal is applied to the input of an SWD patterned for bandwidth limitation. Two SWD output channels characterized by predetermined differential delays of the modulated input signal are amplitude limited and mixed to produce an audio modulation component.

Abstract translation: 在FM接收机中采用SWD结构进行信号解调和频带限制。 FM信号被施加到图案化以用于带宽限制的SWD的输入。 以调制输入信号的预定差分延迟为特征的两个SWD输出通道被幅度限制和混合以产生音频调制分量。

公开(公告)号：US3843932A

公开(公告)日：1974-10-22

申请号：US41550773

申请日：1973-11-14

Applicant: GTE SYLVANIA INC

Inventor： FISCHMAN M

IPC: H03D3/16

CPC classification number: H03D3/16

Abstract: A wide band frequency modulation detector utilizing a surface wave delay device is shown. The surface wave delay device delays the received frequency modulated signal by a predetermined amount. The delayed signal and the undelayed frequency modulated signal are applied to a product detector which reproduces the modulating signal.

Abstract translation: 示出了利用表面波延迟装置的宽带频率调制检测器。 表面波延迟装置将接收的调频信号延迟预定量。 延迟信号和未延迟的调频信号被施加到再现调制信号的乘积检测器。

公开(公告)号：US3588719A

公开(公告)日：1971-06-28

申请号：US3588719D

申请日：1968-12-16

Applicant: IBM

Inventor： ABRAMSON PAUL ,  EMERSON LAWRENCE W

IPC: H03D3/16 ,  H04L27/14 ,  H04L27/148 ,  H03K9/00

CPC classification number: H04L27/14 ,  H03D3/16 ,  H04L27/148

Abstract: A FREQUENCY DETECTION SYSTEM FOR DETECTING THE FREQUENCY OF TONE SIGNAL BURSTS IS PROVIDED WITH A CONTROLLED DAMPING ARRANGEMENT TO LIMIT THE RESONANT BUILDUP OF THE TUNED FREQUENCY DEVICE EMPLOYED THEREIN. DAMPING IS IMPLEMENTED THROUGH UTILIZATION OF A THREE TERMINAL SIGNAL CONTROLLED VARIABLE IMPEDANCE DEVICE, SUCH AS AN FET DEVICE, WHEREIN THE VARIABLE IMPEDANCE PATH IS COUPLED IN SERIES WITH THE INPUT TO

THE SYSTEM AND THE CONTROL TERMINAL IS COUPLED TO THE OUTPUT OF THE SYSTEM.

公开(公告)号：US3582838A

公开(公告)日：1971-06-01

申请号：US3582838D

申请日：1968-04-12

Applicant: ZENITH RADIO CORP

Inventor： DEVRIES ADRIAN J

IPC: H03D3/16 ,  H03H9/00 ,  H03H9/145 ,  H03H9/64 ,  H03H7/10

CPC classification number: H03H9/1455 ,  H03D3/16 ,  H03H9/14547 ,  H03H9/14561

Abstract: A turnable wave signal receiver uses an acoustic filter system for interstage coupling and for obtaining a particular frequency response. For a television receiver, the acoustic system is included in the IF channel and imposes a desired IF characteristic with traps or null points at selected frequencies spaced from the IF carrier frequency and determined by the structure of interaction surface wave devices included in the acoustic filter system. For use in an FM receiver, the acoustic filter system serves as the discriminator to perform the necessary function of converting frequency to amplitude changes. Additionally, particular forms of surface wave interaction devices for the acoustic filter system are disclosed as well as structural arrangements for tuning the system of controlling reflections of acoustic surface waves.

公开(公告)号：US3510769A

公开(公告)日：1970-05-05

申请号：US3510769D

申请日：1962-12-20

Applicant: ROBERT W LANDEE

Inventor： LANDEE ROBERT W

IPC: H03D3/16 ,  G01R23/12 ,  H03D3/02

CPC classification number: H03D3/16

公开(公告)号：US3199040A

公开(公告)日：1965-08-03

申请号：US22192562

申请日：1962-09-06

Applicant: COOGAN JAMES E

Inventor： COOGAN JAMES E

IPC: H03D3/16

CPC classification number: H03D3/16

公开(公告)号：US3074021A

公开(公告)日：1963-01-15

申请号：US72623158

申请日：1958-04-03

Applicant: GEN ELECTRONIC LAB INC

Inventor： RULLMAN ROBERT G

IPC: H03D3/16

CPC classification number: H03D3/16

公开(公告)号：US2913580A

公开(公告)日：1959-11-17

申请号：US60468356

申请日：1956-08-17

Applicant: HERMES ELECTRONICS CO

Inventor： KOSOWSKY DAVID I

IPC: H03D3/16

CPC classification number: H03D3/16

公开(公告)号：US2889458A

公开(公告)日：1959-06-02

申请号：US46819454

申请日：1954-11-12

Applicant: ITT

Inventor： BAUM RICHARD F

IPC: H03D3/16 ,  H03K9/00 ,  H04J1/08

CPC classification number: H03D3/16 ,  H03K9/00 ,  H04J1/08