Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1377521 A
Publication typeGrant
Publication dateMay 10, 1921
Filing dateJul 20, 1920
Publication numberUS 1377521 A, US 1377521A, US-A-1377521, US1377521 A, US1377521A
InventorsSerge Otjlianine
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Serge otjlianine
US 1377521 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)




Patented May 10, 1921.




APPLICATION FILED JULY'20,1920- 1,377,521. te May 10,1921;

2 suns-sun 2.



Specification of Letters Patent.

Patented May 10, 1921.

Application filed July 20, 1920. Serial No. 397,741.

To all whom it may concern:

Be it known that I, SERGE OULIANiNn, a citizen of Russia, residing in Sydenham, London, England, have invented certain new and useful Improvements in Signaling Apparatus, of which the following is a specification.

The present invention relates to Signaling apparatus employing signal-impulses each consisting of a number of vibrations whose frequency is predetermined. The object of this invention'is to provide means whereby, out of a number of impulses of different periodicities, those which are of the predetermined periodicity are selected and arerendered audible. Hereinafter, a device employed to selectimpulses of a predetermined periodicity from a 'miXture or number of impulses of differing periodicities, is referred to as a tone-filter. a

Numerous constructions of apparatus have heretofore been proposed to operate as tone-filters, that is to say devices to select operatively impulses of a predetermined periodicity from a mixture of impulses of different periodicities. Such devices have comprised a tunable resonator, such as a stretched string, tuned to the predetermined periodicity referred to, and a vibratory member capable of responding to impulses of heterogeneous periodicities; electro-magnetic means have in some cases been employed to provide the connecting link where by vibrations from the vibratory member have been imparted to the resonator. In 7 other cases a rigid mechanical connection has been employed as the said link. It has alsobeen proposed, in a transmitter for sub marine sound signals, to connect a submerged part of a vessel, such as the wall of a ship, to a tuning fork by means of a spring; both the said vessel and the tuning fork being rigidly connected to the said spring.

In order to render the vibrations more readily discernible it has been proposed to connect a microphone operatively with the resonator and to'connect electrically a telephone receiver with the microphone so that the latter shall set up sounds in the telephone corresponding with the vibrations of the resonator.

The present invention relates to the tonefilters of the type :in which a tunable resonator is so connected to a receiver or transmitter having a vibratory member capable of responding to impulses of heterogeneous periodicities that the vibrations of the said member tend to be communicated to the resonator;

The present invention provides a tone filter of the type defined characterized by the inclusion in the one instrument of a tunable resonator and a resilient member to constitute the link whereby the transmission of vibrations between the receiver or transmitter and the tunable resonator is efl'ected.

When the resonator is an audible one a microphone may be operatively connected with a telephone receiver and mounted either upon a base carrying the resonator or upon the said vibratory member of the receiver so that the signals may be magnified or their transmission to'some distance from the apparatusfacilitated.

The relative situation between the point of connection of theresonator to the said vibratory member and the nodes in the resonator may be adjustable forthe purpose -i Fig. 4 is a transverse section on the line 4 -4 of Fig. 3, and

Fig. 5 is a perspective view of a third construction.

In the construction shown in Figs. 1 and 2, an electro-magnet A is provided, energized from a source which will impart to the electro-magnet current-impulses of diverse periodicities depending upon the signals picked up. The electro-magnet is provided with a resilient tongue B as armature, and a small bent plate-spring C is attached to the armature with its plane arranged at right-angles to the length of the armature. The magnet is secured to a base D which constitutes a sounding-board upon which is a stretched string E, which may be of metal, and which is provided with means at F, whereby the tension in it and thus the pitch of note which it emits may be varied. The plate-spring C is pierced with an elongated hole C rather larger than the string E and the string is arranged to pass through this hole and to apply through the spring a light force tending to hold the armature away from the poles of its magnet. In addition to a tuning pin at F for varying the tension in the string, a slidable bridge G is provided, held by the tension of the string, between the string and its sounding-board.

I11 use, the pitch of the string is tuned to that of the impulses which it is desired to receive selectively; the position of the nodes and, if necessary, the final adjustment of the pitch, is obtained by moving the bridge into the required position. Current-impulses of all sorts of periodicitie-s imparted to the electro-magnet make the armature tend to vibrate in response. The mechanical interconnection with the string, however, prevents free response to these impulses unless they are of the predetermined periodicity and the resiliency of the spring C tends to absorb the mutual impulses between the string and armature. When, however, an impulse is received whose periodicity corresponds with the note to which the string has been tuned, the response is quite free since the string responds synchronously to the forces applied to it by the armature. In result, the string with its sounding-board emits a clear loud sound of the note to which it has been tuned, so that the operator can listen to the signals received, for exampleas dots and dashes, without difliculty.

If it is desired to transmit the signals from the apparatus just above described to some distance, or to magnify them for any purpose, the construction of Figs. 3 and 4 may be used. In this construction a microphone II is mounted with its diaphragm on the armature of the electro-magnet, and its bodyportion supported from the magnet-core by a bridge-piece J.

It is to be understood that the microphone may be mounted either upon the soundingboard, upon the electro-magnet armature as shown, or upon even the string itself. Of the three said positions for the microphone, the first will give the greatest purity of tone, and the second will give the greatest loudness while the last will give a result, as compared with those of the other two, intermediate between these two. The microphone is connected in series with a telephone-receiver and battery in the known manner whereby the audible signals may be finally received in the telephone.

Obviously either the string or the armature may be arranged to operate, when the amplitude of its vibrations becomes sufiiciently great, through the aforesaid resonance, any indicating or signaling device. As an example of such application, the device shown in Fig. 5 may be citec. In this construction a commutator device bearing a resiliently controlled fly, such as is described ,curs until resonance which the string passes,

in my British Patent No. 110569 dated Octoher 20th, 1916, may be employed as indicated at 0. With this, nothing useful ocarises between the string and the tongue B. At such times, however, the spring 0, which is elongated for the purpose of engaging with the toothed wheel P and slightly ient at its tip toward the wheel, causes the latter to rotate, and thus closes the circuit between two terminals L which may be connected to any electrical circuit that may be convenient and so operate an indicator or recorder included in such circuit. The terminals to the windin s of the electro-magnet A, are shown at Ii It is to beunderstood that other tunable resonators than a stretched string may be employed; for example a tunable reed may be used. 7

An important feature of the present invention is a construction which provides both a tone-filtering function and an audible result without necessitating the employment of a microphone or-telephonex The use of the apparatus is not confined to signaling as ordinarily understood but it may beemployed to detect the occurrence of a vibration of a particular pitch or periodic ity. I'Vhen such vibration occurs, the resonator announces its occurrence audibly.

What I claim as my invention and desire to secure by Letters Patent is 1. In a tone filter of the class described, in combination, a transmitting member, a string resonating member, and means connecting said transmitter and resonator comprising a spring secured to. the transmitting member and having an aperture through said aperture being larger than the strin I 2. In a tone filter 3f the class described in combination, a transmitting member including an armature and electro-magnets, a string resonating member, and means connecting said transmitter and resonator comprising a spring secured to one of said members and normally tending to hold the armature away from the magnet.

3. In a tone filter of the class described, in combination, a transmitter including an armature, a resonator, and a spring mounted on said armature and connecting said transmitter and resonator, substantially as described. a i V 4:. In a tone filter of the class described, in combination, a transmitter, a resonator, mechanical connecting means between said transmitter and resonator, and adjustable means for determining the position of the nodes of the resonator, for'the purpose set forth.

5. In a tone filter of the class described, in combination, a transmitting member, a resonating member, connecting means between said transmitting and resonating members, and a microphone mounted on the nator comprising a spring mounted on said transmitting member, for the purpose set armature and havingan aperture therein forth. through which the string resonator extends, 10 I 6. In a tone filter of the class described, for the purpose set forth. 5 in combination, a transmitter including an In testimony whereof I affix my signature.

armature string resonator and resilient means connecting said transmitter and reso- SERGE OULIANINE.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5995635 *Aug 8, 1997Nov 30, 1999Fletcher; WilliamSound pickup and amplifier apparatus for vibrating strings
U.S. Classification333/186, 381/162, 338/116, 178/48, 338/99, 84/246, 381/152
International ClassificationH04R11/00
Cooperative ClassificationH04R11/00
European ClassificationH04R11/00