US2782376A - Suppressed carrier modulator - Google Patents
Suppressed carrier modulator Download PDFInfo
- Publication number
- US2782376A US2782376A US567694A US56769456A US2782376A US 2782376 A US2782376 A US 2782376A US 567694 A US567694 A US 567694A US 56769456 A US56769456 A US 56769456A US 2782376 A US2782376 A US 2782376A
- Authority
- US
- United States
- Prior art keywords
- frequency
- magnetomotive force
- coil
- modulation
- producing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004804 winding Methods 0.000 description 55
- 239000000463 material Substances 0.000 description 36
- 230000005291 magnetic effect Effects 0.000 description 19
- 238000001914 filtration Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- QEVHRUUCFGRFIF-MDEJGZGSSA-N reserpine Chemical compound O([C@H]1[C@@H]([C@H]([C@H]2C[C@@H]3C4=C(C5=CC=C(OC)C=C5N4)CCN3C[C@H]2C1)C(=O)OC)OC)C(=O)C1=CC(OC)=C(OC)C(OC)=C1 QEVHRUUCFGRFIF-MDEJGZGSSA-N 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
- H03C1/54—Balanced modulators, e.g. bridge type, ring type or double balanced type
Definitions
- the invention relates in general to magnetic modulation means and in particular to a modulation means for suppressed carrier operation.
- Suppressed carrier operation with which this invention is primarily concerned, is commonly employed where it is desirable to avoid unauthorized monitoring of the communication system.
- This type of operation involves the elimination of the carrier frequency from the transmitter output when a zero modulation voltage is applied to the carrier.
- the carrier suppression is accomplished by complex electronic circuitry.
- Fig. 1 depicts one embodiment of this invention.
- Fig. 2 is a graphical showing of the permeability characteristic of grain oriented material.
- Fig. 3a and Fig. 3b are graphical showings of the hysteresis curves for a grain oriented material in the direction of grain orientation and in the direction perpendicular to the grain orientation, respectively.
- the invention comprises a unique inductive field interaction between two coils which are wound in crosswise manner on a metallic form.
- One of the coils is energized at the carrier frequency and the other is energized at the modulation frequency.
- the output is taken through a high pass filter connected in parallel with the coil being energized at the modulation frequency.
- Fig. 1 depicts a structural arrangement of one embodiment of the invention wherein coil 10 and coil 20 are wound on metallic form 30 such that the axis of the coils are in orthogonally disposed relation.
- a low frequency source 11 capable of producing, for example, a 2 kc. modulation signal is connected across the two terminals, 12 and 13, of the coil 10.
- a high frequency source 21 capable of producing, for example, a 60 kc. carrier frequency is connected across the two terminals, 22 and 23, of the coil 20.
- the output circuit comprises a filter 40 whose input terminals, 41 and 42, are connected across terminals 12 and 13, and whose output terminals, 43 and 44, are connected across the output load 56.
- filter 40 is provided merely to isolate the modulation source 11 from the output.
- the only critical requirement of this filter in the embodiment of Fig. l is that it be capable of passing a band of frequencies in the region of the carrier frequency.
- An additional magnetic field producing means 60 is disposed in parallel relation to the axis of the coil 20 to permit interaction between the field produced by the energized coil 20 and that produced by the energized means 6ft.
- means 60 may be a bar magnet, or alternatively, an electromagnetic means might be employed.
- the modulation of one frequency with another is a product sinusoidal function which requires a processing of the two sinusoidal waves through a non-linear medium.
- the non-linear gm characteristic of the tubes is utilized in the processing of the sinusoidal waves by critically biasing the tubes in the non-linear region of the gm curve.
- the non-linear characteristic required in the processing of the sinusoidal waves is provided by saturably biasing grain oriented material in one direction.
- a grain oriented material is employed as the metallic form 30 on which the coils 10 and 20 are cross-wound.
- the grain oriented material utilized in this invention is normally produced by a cold rolling procedure on silicon iron, generally with a silicon content up to 3.5%.
- This manufacturing procedure provides a magnetically anisotropic sheet in which the crystalline structure seems to take up a preferred orientation and the finished sheet has directional magnetic properties similar to those for a single crystal.
- the direction of highest permeability is in the rolling direction.
- the lowest hysteresis loss is also in the rolling direction.
- Such materials are commercially known as Hypersil, Trancor 3x, etc.
- the coils l0 and 20 are so disposed on the metallic form 30 that the magnetomotive force of coil 10 is in the direction of grain orientation and the magnetomotive force of coil 20 is in a direction perpendicular thereto.
- a unidirectional source 60 is disposed to produce a magnetomotivc force in the same plane as that of the coil 29.
- This additional magnetomotive force has the effect of partially saturating the magnetically anisotropic sheet in the direction perpendicular to the direction of grain orientation.
- the anisotropy of the frame material affords a mutual coupling between the two coils when both the carrier signal and the modulation signal are present and the extent of this coupling is a function of the non-linearity of the hysteresis loop of the magnetically anisotropic material.
- the magnetomotive force of source 60 the material is partially saturated in one direction causing the carrier to operate in a non-symmetrical manner about the hysteresis loop.
- the resultant etfect is then the desired mixing of the carrier frequency and the modulation to produce a modulated output.
- the invention described herein provides a new and simplified carrier suppressed modulation system which does not employ vacuum tubes or complex circuitry and thus overcomes many of the inherent disadvantages of prior known systems.
- a magnetic modulation means comprising a first signal source for producing a modulation frequency, a second signal source for producing a carrier frequency to be modulated, first and second coil windings connected to said first and second signal sources, respectively, said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnctomotive force of said first coil winding is in the direection of grain orientation of said material and the magnetomotive force of said second coil winding is in a direction perpendicular thereto, unidirectional magnetic means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding, and filtering means capable of passing frequencies in the region of said second frequency source connected across said first coil winding for obtaining a modulated output signal therefrom.
- a magnetic modulation means comprising a first signal source for producing a modulation frequency, a second signal source for producing a carrier frequency to be modulated.
- first and second coil windings connected to said first and second signal sources, respectively, said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain of orientation such that the magnetornotive force of said first coil winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil winding i in a direction perpendicular thereto, permanent magnet means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomtive force of said second coil winding. and filtering means capable of passing frequencies in the region of said second frequency source connected across said first coil winding for obtaining a modulated output signal therefrom.
- a magnetic modulation means comprising a first signal source for producing a modulation frequency, a
- first and second coil windings connected to said first and second signal sources, respectively, said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of said first coil Winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil winding is in a direction perpendicular thereto, unidirectional magnetic means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding, and high pass filter means connected across said first winding for obtaining a modulated output signal therefrom.
- a magnetic modulation means comprising a first signal source for producing a modulation frequency, a second signal source for producing a carrier frequency to be modulated, first and second coil windings connected to said first and second signal sources, respectively, said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of one of said coil windings is in the direction of grain orientation of said material and the magnetomotive force of the other of said coil windings is in a direction perpendicular thereto, unidirectional mag netic means for producing a magnetomotive force in the same direction and plane as the magnetomotive force of the coil winding connected to said second signal source, and filtering means capable of passing frequencies in the region of said second frequency source connected across one of said coil windings for obtaining a modulated output signal therefrom.
- a magnetic modulation means comprising a first signal source for producing a modulation frequency, a second signal source for producing a carrier frequency to be modulated, first and second coil windings connected to said first and second signal sources, respectively, said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of one of said coil windings is in the direction of grain orientation of said material and the magnetomotive force of the other of said coil windings is in a direction perpendicular thereto, unidirectional magnetic means for producing a magnetomotive force in the same direction and plane as the magnetomotive force of the coil winding connected to said second signal source, and filtering means capable of passing frequencies in the region of said second frequency source connected across the coil winding connected to said first signal source for obtaining a modulated output signal.
- a magnetic modulation means comprising a first signal source for producing a first frequency; a second sig nal source for producing a second frequency to be modulated with said first frequency; first and second coil windings connected to said first and second signal sources, respectively; said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of said first coil winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil Winding is in a direction perpendicular thereto, uni-directional magnetic means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding; and output means connected across said first coil winding for obtaining an output signal therefrom; said output means including a signal rejection means capable of rejecting said first frequency.
- a magnetic modulation means comprising a first signal source for producing a first frequency; a second signal source for producing a second frequency to be modulated With said first frequency; first and second coil windings connected to said first and second signal sources, respectively; said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of said first coil winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil winding is in a direction perpendicular thereto; permanent magnet means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding; and output means connected across said first coil winding for obtaining an output signal therefrom; said output means including a signal rejection means capable of rejecting said first frequency.
- a magnetic modulation means comprising a first signal source for producing a first frequency; a second signal source for producing a second frequency to be modulated with said first frequency; first and second coil windings connected to said first and second signal sources, respectively; said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of said first coil winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil winding is in a direction perpendicular thereto; unidirectional magnetic means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding; and output means connected across one of said coil windings for obtaining an output signal therefrom; said output means including a signal rejection means capable of rejecting the output frequency of the signal source connected in parallel with said output means.
- a magnetic modulation means comprising a first signal source for producing a first frequency, a second signal source for producing a second frequency to be modulated with said first frequency; first and second coil windings connected to said first and second signal sources, respec tively; said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of said first coil Winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil winding is in a direction perpendicular thereto; permanent magnet means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding, and output means connected across one of said coil windings for obtaining an output signal therefrom, said output means including a signal rejection means capable of rejecting the output frequency of the signal source connected in parallel with said output means.
Landscapes
- Magnetic Treatment Devices (AREA)
Description
Feb. 19, 1957 H. T. MORTIMER 2,782,376
SUPPRESSED CARRIER MODULATOR Filed Feb. 24, 1956 22 CAR RIER SOURCE Fl LTER MODULATION SOURCE INVENTOR HAR RY T. MORTI M ER ATTORNEYS:
United States Patent SUPPRESSED CARRIER MODULATOR Harry T. Mortimer, Los Angeles, Calif.
Application February 24, 1956, Serial No. 567,694
9 Claims. (Cl. 33251) (Granted under Title 35, U. S. Code (1952), sec. 266) The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.
The invention relates in general to magnetic modulation means and in particular to a modulation means for suppressed carrier operation.
Suppressed carrier operation, with which this invention is primarily concerned, is commonly employed where it is desirable to avoid unauthorized monitoring of the communication system. This type of operation involves the elimination of the carrier frequency from the transmitter output when a zero modulation voltage is applied to the carrier. Generally the carrier suppression is accomplished by complex electronic circuitry. ample, as shown in the patent to Duncan No. 1,560,505, is'suedNovember 3, 1925, a multi-phase source of carrier frequency oscillations arranged for in-phase or outof-phase modulation whereby signaling energy is impressed on the antenna only when the modulation is in-phase might be employed. It will be seen that a simplified suppressed carrier modulation system would be highly desirable. Accordingly:
It is an object of this invention to provide a simple magnetic modulation means which permits suppressed carrier operation.
It is still another object of this invention to utilize a non-linear characteristic of grain oriented rolled steel in the modulation of a carrier frequency.
It is still another object of this invention to provide a fast acting means for intermittently mixing two frequencies to produce a sinusoidal product frequency.
Other objects of this invention will become apparent upon a more comprehensive understanding of the invention for which reference is had to the attached specification and drawings.
In the drawings:
Fig. 1 depicts one embodiment of this invention.
Fig. 2 is a graphical showing of the permeability characteristic of grain oriented material.
Fig. 3a and Fig. 3b are graphical showings of the hysteresis curves for a grain oriented material in the direction of grain orientation and in the direction perpendicular to the grain orientation, respectively.
Briefly, the invention comprises a unique inductive field interaction between two coils which are wound in crosswise manner on a metallic form. One of the coils is energized at the carrier frequency and the other is energized at the modulation frequency. In a preferred embodiment the output is taken through a high pass filter connected in parallel with the coil being energized at the modulation frequency. By winding the two coils on a grain oriented material and introducing an additional magneticfield the non-linear hysteresis characteristic ofthe grain oriented material is utilized as the essential non-linear characteristic in the frequency mixing process to produce a modulated output. In the invention For ex- 2 ,782,376 Patented Feb. 19, 1957 ice both coils must be energized for inductive interaction. In the preferred embodiment, there is no output when modulation ceasesin typical suppressed carrier fashion.
Referring now to the drawings:
Fig. 1 depicts a structural arrangement of one embodiment of the invention wherein coil 10 and coil 20 are wound on metallic form 30 such that the axis of the coils are in orthogonally disposed relation.
A low frequency source 11 capable of producing, for example, a 2 kc. modulation signal is connected across the two terminals, 12 and 13, of the coil 10. A high frequency source 21 capable of producing, for example, a 60 kc. carrier frequency is connected across the two terminals, 22 and 23, of the coil 20. The output circuit comprises a filter 40 whose input terminals, 41 and 42, are connected across terminals 12 and 13, and whose output terminals, 43 and 44, are connected across the output load 56. As will be seen, filter 40 is provided merely to isolate the modulation source 11 from the output. Thus the only critical requirement of this filter in the embodiment of Fig. l is that it be capable of passing a band of frequencies in the region of the carrier frequency.
An additional magnetic field producing means 60 is disposed in parallel relation to the axis of the coil 20 to permit interaction between the field produced by the energized coil 20 and that produced by the energized means 6ft. As depicted in the drawings, means 60 may be a bar magnet, or alternatively, an electromagnetic means might be employed.
As is well known, the modulation of one frequency with another is a product sinusoidal function which requires a processing of the two sinusoidal waves through a non-linear medium. For example, in a balanced modu later the non-linear gm characteristic of the tubes is utilized in the processing of the sinusoidal waves by critically biasing the tubes in the non-linear region of the gm curve.
In the device of this invention the non-linear characteristic required in the processing of the sinusoidal waves is provided by saturably biasing grain oriented material in one direction.
In more detailed explanation, a grain oriented material is employed as the metallic form 30 on which the coils 10 and 20 are cross-wound. The grain oriented material utilized in this invention is normally produced by a cold rolling procedure on silicon iron, generally with a silicon content up to 3.5%. This manufacturing procedure provides a magnetically anisotropic sheet in which the crystalline structure seems to take up a preferred orientation and the finished sheet has directional magnetic properties similar to those for a single crystal. As indicated in Fig. 2, the direction of highest permeability is in the rolling direction. Likewise, as seen in Figs. 3a and 3b, the lowest hysteresis loss is also in the rolling direction. Such materials are commercially known as Hypersil, Trancor 3x, etc.
in accordance with the invention, the coils l0 and 20 are so disposed on the metallic form 30 that the magnetomotive force of coil 10 is in the direction of grain orientation and the magnetomotive force of coil 20 is in a direction perpendicular thereto. In addition, a unidirectional source 60 is disposed to produce a magnetomotivc force in the same plane as that of the coil 29.
This additional magnetomotive force has the effect of partially saturating the magnetically anisotropic sheet in the direction perpendicular to the direction of grain orientation.
In simplified analysis, the anisotropy of the frame material affords a mutual coupling between the two coils when both the carrier signal and the modulation signal are present and the extent of this coupling is a function of the non-linearity of the hysteresis loop of the magnetically anisotropic material. With the addition of the magnetomotive force of source 60 the material is partially saturated in one direction causing the carrier to operate in a non-symmetrical manner about the hysteresis loop. The resultant etfect is then the desired mixing of the carrier frequency and the modulation to produce a modulated output.
Since the two coils, 10 and 20, are in orthogonal arrangement in this invention it will be seen that in the absence of either the carrier or the modulation frequency, no inductive coupling between the coils 1t) and 20 is possible. As previously mentioned the output is taken across the coil 10 in the embodiment shown. Thus, in the absence of the modulation signal, the carrier signal will not reach the input of filter circuit 60 and there will be no carrier signal output.
The invention described herein provides a new and simplified carrier suppressed modulation system which does not employ vacuum tubes or complex circuitry and thus overcomes many of the inherent disadvantages of prior known systems.
It is understood, of course, that the invention which has been exemplarily described herein, may be readily employed in other modulation systems wherein suppressed carrier operation is not required by taking the output across the terminals 22, 23 of coil 20. Finally, it is understood that the invention is to be limited only by the scope of the appended claims.
What is claimed is:
l. A magnetic modulation means comprising a first signal source for producing a modulation frequency, a second signal source for producing a carrier frequency to be modulated, first and second coil windings connected to said first and second signal sources, respectively, said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnctomotive force of said first coil winding is in the direection of grain orientation of said material and the magnetomotive force of said second coil winding is in a direction perpendicular thereto, unidirectional magnetic means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding, and filtering means capable of passing frequencies in the region of said second frequency source connected across said first coil winding for obtaining a modulated output signal therefrom.
2. A magnetic modulation means comprising a first signal source for producing a modulation frequency, a second signal source for producing a carrier frequency to be modulated. first and second coil windings connected to said first and second signal sources, respectively, said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain of orientation such that the magnetornotive force of said first coil winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil winding i in a direction perpendicular thereto, permanent magnet means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomtive force of said second coil winding. and filtering means capable of passing frequencies in the region of said second frequency source connected across said first coil winding for obtaining a modulated output signal therefrom.
3. A magnetic modulation means comprising a first signal source for producing a modulation frequency, a
' second signal source for producing a carrier frequency to be modulated, first and second coil windings connected to said first and second signal sources, respectively, said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of said first coil Winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil winding is in a direction perpendicular thereto, unidirectional magnetic means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding, and high pass filter means connected across said first winding for obtaining a modulated output signal therefrom.
4. A magnetic modulation means comprising a first signal source for producing a modulation frequency, a second signal source for producing a carrier frequency to be modulated, first and second coil windings connected to said first and second signal sources, respectively, said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of one of said coil windings is in the direction of grain orientation of said material and the magnetomotive force of the other of said coil windings is in a direction perpendicular thereto, unidirectional mag netic means for producing a magnetomotive force in the same direction and plane as the magnetomotive force of the coil winding connected to said second signal source, and filtering means capable of passing frequencies in the region of said second frequency source connected across one of said coil windings for obtaining a modulated output signal therefrom.
5. A magnetic modulation means comprising a first signal source for producing a modulation frequency, a second signal source for producing a carrier frequency to be modulated, first and second coil windings connected to said first and second signal sources, respectively, said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of one of said coil windings is in the direction of grain orientation of said material and the magnetomotive force of the other of said coil windings is in a direction perpendicular thereto, unidirectional magnetic means for producing a magnetomotive force in the same direction and plane as the magnetomotive force of the coil winding connected to said second signal source, and filtering means capable of passing frequencies in the region of said second frequency source connected across the coil winding connected to said first signal source for obtaining a modulated output signal.
6. A magnetic modulation means comprising a first signal source for producing a first frequency; a second sig nal source for producing a second frequency to be modulated with said first frequency; first and second coil windings connected to said first and second signal sources, respectively; said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of said first coil winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil Winding is in a direction perpendicular thereto, uni-directional magnetic means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding; and output means connected across said first coil winding for obtaining an output signal therefrom; said output means including a signal rejection means capable of rejecting said first frequency.
7. A magnetic modulation means comprising a first signal source for producing a first frequency; a second signal source for producing a second frequency to be modulated With said first frequency; first and second coil windings connected to said first and second signal sources, respectively; said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of said first coil winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil winding is in a direction perpendicular thereto; permanent magnet means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding; and output means connected across said first coil winding for obtaining an output signal therefrom; said output means including a signal rejection means capable of rejecting said first frequency.
8. A magnetic modulation means comprising a first signal source for producing a first frequency; a second signal source for producing a second frequency to be modulated with said first frequency; first and second coil windings connected to said first and second signal sources, respectively; said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of said first coil winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil winding is in a direction perpendicular thereto; unidirectional magnetic means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding; and output means connected across one of said coil windings for obtaining an output signal therefrom; said output means including a signal rejection means capable of rejecting the output frequency of the signal source connected in parallel with said output means.
9. A magnetic modulation means comprising a first signal source for producing a first frequency, a second signal source for producing a second frequency to be modulated with said first frequency; first and second coil windings connected to said first and second signal sources, respec tively; said first and second coil windings being wound in crosswise manner on a form of magnetically anisotropic material having a determined grain orientation such that the magnetomotive force of said first coil Winding is in the direction of grain orientation of said material and the magnetomotive force of said second coil winding is in a direction perpendicular thereto; permanent magnet means for producing a magnetomotive force in a direction perpendicular to the direction of grain orientation of said magnetically anisotropic material and in the same plane as the magnetomotive force of said second coil winding, and output means connected across one of said coil windings for obtaining an output signal therefrom, said output means including a signal rejection means capable of rejecting the output frequency of the signal source connected in parallel with said output means.
References Cited in the file of this patent UNITED STATES PATENTS
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US567694A US2782376A (en) | 1956-02-24 | 1956-02-24 | Suppressed carrier modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US567694A US2782376A (en) | 1956-02-24 | 1956-02-24 | Suppressed carrier modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2782376A true US2782376A (en) | 1957-02-19 |
Family
ID=24268249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US567694A Expired - Lifetime US2782376A (en) | 1956-02-24 | 1956-02-24 | Suppressed carrier modulator |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2782376A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2990521A (en) * | 1957-02-23 | 1961-06-27 | Tdk Electronics Co Ltd | Magnetic modulators |
| US3030574A (en) * | 1957-02-26 | 1962-04-17 | Westinghouse Electric Corp | Position indicator |
| US3247470A (en) * | 1961-01-23 | 1966-04-19 | Univ Iowa State Res Found Inc | Magnetic film device useful as a modulator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2569468A (en) * | 1948-06-16 | 1951-10-02 | Edward A Gaugler | Method of producing grain oriented ferromagnetic alloys |
| US2703388A (en) * | 1950-05-16 | 1955-03-01 | Automatic Elect Lab | Magnetic cross valve circuits |
-
1956
- 1956-02-24 US US567694A patent/US2782376A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2569468A (en) * | 1948-06-16 | 1951-10-02 | Edward A Gaugler | Method of producing grain oriented ferromagnetic alloys |
| US2703388A (en) * | 1950-05-16 | 1955-03-01 | Automatic Elect Lab | Magnetic cross valve circuits |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2990521A (en) * | 1957-02-23 | 1961-06-27 | Tdk Electronics Co Ltd | Magnetic modulators |
| US3030574A (en) * | 1957-02-26 | 1962-04-17 | Westinghouse Electric Corp | Position indicator |
| US3247470A (en) * | 1961-01-23 | 1966-04-19 | Univ Iowa State Res Found Inc | Magnetic film device useful as a modulator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2741757A (en) | Magnetic storage and sensing device | |
| US2166359A (en) | Magnetostrictive device | |
| US2820109A (en) | Magnetic amplifier | |
| US1287982A (en) | Modulating system. | |
| US2883604A (en) | Magnetic frequency changer | |
| US2782376A (en) | Suppressed carrier modulator | |
| US3811941A (en) | Article for processing electromagnetic wave energy | |
| US3012177A (en) | Magnetic position sensing device | |
| De Wijn et al. | Temperature dependence of the EPR linewidth in K2MnF4 and Rb2MnF4 | |
| US2026758A (en) | Secret signaling | |
| US3159785A (en) | Second harmonic magnetometer having a plurality of transducers in combination with means responsive to flux amplitude and direction | |
| US3735305A (en) | High power electrically variable inductor | |
| US2708237A (en) | Selective frequency changer | |
| US2599068A (en) | Adjacent channel rejection by magneto-striction | |
| US2556083A (en) | Magnetic amplifier | |
| US2613268A (en) | Broad band-pass circuit arrangement | |
| GB942124A (en) | Improvements in or relating to circuit-arrangements for the production of ultrasonic oscillations | |
| US2901555A (en) | Electromechanical amplifier | |
| US2742567A (en) | Electromagnetic amplitude limiters | |
| US2477337A (en) | Magnetic detector | |
| US2458315A (en) | Method and apparatus for reproduction of angular magnetic recording | |
| US2997667A (en) | Method and means of modulation | |
| US2998531A (en) | Switching system of binary phase signal | |
| US3531747A (en) | Tunable inductor | |
| GB988964A (en) | Magnetic field detector |