US788728A - Apparatus for electromagnetically receiving, recording, reproducing, and distributing articulate speech, &c. - Google Patents

Description

I PATENTED MAY 2, 1905.

V. POULSEN. 1

APPARATUS FOR ELEGTROMAGNETIGALLY RECEIVING, RECORDING, EEPRODUGING, AND DISTRIBUTING ARTIOULATE SPEECH, 8w.

APPLIUATION FILED AUG-14, 1901.

WITNESSES 5' Z/MM ' an reams.

ii atented llit'ay til, Mind I VALDEMAR POULSEN, 0F COPENHAGEN, DENMARK. r

APPARATUS FOR ELECTROMAGNETICALLY RECEIVING, RECORDING, REPRO DUCING, AND DISTRIBUTING ARTICULME SPEECH, 8w.

SPECIFICATION forming part of Letters Patent No. 788,728, dated May 2, 1905.

Application filed August 14, 1901. Serial No. 71,986 I 1'0 all whom it may concern:

. Be it known that l, VALDEMAR Pounsnn, a I subject of the'King of Denmark, residing at Copenhagen, in the Kingdom of Denmark, have invented certain new and useful Improvements in and Relating to Apparatus for,

Electromagnetically- Receiving, Recording, Reproducing, and Distributing Articulate Speech and other Messages or Signals,of which the following is a. specification.

This invention relates to apparatus for electromagnetically receiving, recording, reproducing, and distributing articulatespeech and other messages or signals, and utilizes the principle disclosed in Patent No. 661,619, of November 13, 1900, issued to me. in the said patent a method .is described of recording electrical impulses which are created by sounds or other means in an electrical circuit, which consists in tracing a magnetic record thereof in a steel body by meansof an electromagnet, through which the said impulses flow. The steel body retains the magnetic record or impression, and when it is desired to reproduce the speech or signals the magnet is subjected to the said magnetic im press-ions,

and electrical impulses of the same characterare again created in the circuit containing the magnet. if the original impulses were created by the voice acting upon a telephonetransmitter, the reproduced impulses may be caused to aidect a telephone-receiver, which will then give out the same message that was spoken into the transmitter. The present invention utilizes this principle, but consists of a means whereby the recorded message is'substantially simultaneously reproduced and distributed to an indefinite'number of receiving instruments immediately after it has been re corded, thereby rendering it possible for a number of persons-or instruments to receive the same message at a number of diderent points or locations. The apparatus therefore becomes useful as a means for distributing information or news of any character to an indefinite number of subscribers simultaneously.

The invention also consists of a special form of receptive surface or body and means for operating the same,whereby a simple and apart and around which passes an endless band or wire a of steel or other suitable parama'gnetic material. One of the pulleys- A, for instance-4s rotated by a motor C of any character by means of a belt a passing over a pulley 0' on the axis of pulley A. The banda is thereby caused to travel.

. e is an electromagnet, which I call the recordingmagnet. it is preferably placed beneath the band or wire a, with its pole-pieces either resting in contact with said wire or band or so close: to it as to magnetically inlicence the band when the magnet is vitalized. This magnet is in a telephone-circuit containing a transmitter T, and the latter instrument may be directly in circuit with the magnet, or it may be in the primary circuit t of induction- ;coil r, the secondary circuit of which includes tromagnets of similar character to the mag net e and are placed in similar relation to the wire or band from the recording-magnet in the direction in which the band travels. Each of these magnets f is in a circuit g g g, the, leading to various points, localities, or sub scribers stations, where are placed suitable receiving instruments, such as telephone-re ceivers It. The circuits g obviously may be of any length within the capacity of the telephonic service and may cover a wide range of territory, Beyond the magnets fl locate another electromagnet 2', similarly placed with respect to the wire or band and being in circuit with a source of constant current c".

The operation of this apparatus is as follows: it being understood that information A sending operator will at the same time speak the information or news into the transmitter T, and the motor C will be started. The telephonic currents or impulses thus impressed upon the circuit containing therecording-magnet c vitalize said magnet successively in varying degrees, corresponding to the sound-waves of the voice of the speaker, and this magnet therefore magnetizes successive portions of the'band or wire a in a manner corresponding to its own changing magnetic condition. The band being of steel or similar magnetic material retains these magnetic conditions or impressionaandas it moves along it carries them successively past'the poles of the several'magnets f f &c. As the pole or poles of each magnet comes under this influence a current or impulse of electricity is generated in the coil of the magnet, which traverses the circuit g, g, or g*, &c., and acts upon the receiver R therein. 'As each magnetic impression in the band acts correspondingly on the magnets f, each receiver R will give out the spaech or message that is delivered into the transmitter T, and all subscribers 'will receive the message at substantially the same time. The magnet z is maintained at a constant degree and polarity of magnetism,

so as to uniformlymagnetize the band after it has passed beyond all of the magnets f f &c., to thus obliterate the magnetic record made by the magnet c after it has been fully utilized and allow the band to be continu-' ously presented to said recording-magnet in a clean condition. By this arrangement it is possible to use the band continuously for any lengthoftime, whereas if the obliterat ing-magnetwere not used the capacity of the band would be limited to one turnaround the pulleys. Obviously, a permanent magnetcan be substituted for the magnet a and its battery.

Instead of the telephonic instruments described telegraphic instruments can be used, thus a key in the place of the transmitter T and a recorder or relay and sounder in place of the receivers It.

Whenever a subscriber finds it inconvenient to listen to the message at the time it is delivered, he can cut in a telegraphoneG'of the character described in said Poulsen patent by throwing the switch j and record the message thereon, after which he can listen to it pleasure.

Having described my invention, I claim 1. The combination of a receptivebody for magnetically recording speech or other signals represented by electrical impulses, consisting of an endless band or'wire of steel or other paramagnetic material and an electromagnet through which such impulses flow, a second electromagnet in which said impulses are reproduced and a third magnet of constant strength adapted to uniformly magnetize the band or wire. Y 2. In an apparatus for magnetically recordas his ing and reproducing-electrical impulses, the combination of a body in which the record is made, a recording-electromagnet and a'reproducing-electromagnet arranged in succession simultaneously.

3. In an apparatus for magnetically recording and reproducing electrical impulses, the combination of a body. in which the record is made, a recording-electromagnet,a reproducalong said body and means for utilizing them ing-electromagnet and an obliterating-magnet arranged in succession along said body and means for utilizing them simultaneously.

4. In an apparatus for recording and reproducing speech or signals the combination with a body on which the record is made, a recording apparatus and a plurality of reproducing apparatuses adapted to be operated simultaneously.

5. In an apparatus 'for recording-and reproducing speech or signals, the combination with a paramagnetic body, a recording-magnet having its pole or poles presented to said body, an electric circuit including said magnet, transmitting apparatus'includedin .said circuit, a pluralityof reprod ucing-electromagnets whose poles are presented to said body, electric circuits respectively including said reproducingmagnets and receiving apparatus located in said circuits.

6. In an apparatus for recording and reproducing speech or signals electromagnetically, the combination with a paramagnetic body in the form of an endless strip, a recording-electromagnet having its pole or poles presented to said strip, an electric circuit including said magnet, ,a transmitting apparatus included in said circuit, a plurality of reproducing-mag nets whose pole or poles are presented at successive points to said strip, electric circuits respectively including said reproducing-magnets andreceiving apparatus located in said circuits.

7. In'an apparatus for recording and reproducing speech or signals electromagnetically, the combination with a paramagnetic body in the form of a strip, a recording-magnet having its pole or poles presented to said strip, an electric circuit including said magnet and also a transmitting apparatus, a plurality of reproducing-'electromagnets whose pole or poles are presented at successive points to said strip,

electric circuits respectively including said reproducing-magnets, receiving apparatus also included in said circuits, another magnet possessing a constant degree of magnetism and means whereby said strip may be moved with respect to the poles of all'of said magnets.

8. In an apparatus for recording and reproducing speech or signals electromagnetically, the combination of-pulleys, means for rotating the same, a paramagnetic strip passing around said pulleys and adapted to be moved thereby, a recording-magnet having its pole or poles presented to said strip, an electric circuit including said magnet and a transmitting apparatus, a plurality of reproducing-electromagnets arranged at successive points along said strip beyond the recording-magnet and Whose poles are likewise presented to said strip, electric circuits respectively including said reproducing-magnets and receiving apparatus located in each of said circuits.

9. In an apparatus for recording and reproducing speech or signals electromagnetically, the combination of pulleys, means for rotating the same, a paramagnetic strip passing around said pulleys and adapted to be moved thereby, a recording-magnet having its pole or poles presented to said strip, an electric circuit including said magnet and a transmitting apparatus, a plurality of reproducing-electromagnets. arranged at successive points along said strip beyond the recording-magnet, and whose poles are likewise presented to said strip, electric circuits respectively including said reproducing-magnets, receiving apparatus located in each of said circuits and an obliterating-magnet presented to said strip at a point beyond the reproducing-magnet.

10. In an apparatus for recording and reproducing electrical impulses representing speech or signals, the combination with a steel or other magnetizable body, of a magnet of constant strength adapted to impart a uniform magnetization to said body, an electromagnetcoil through which the impulses to be recorded are directed, and a second electromagnet in whose coils said impulses are reproduced, the magnets and the said magnetizable body having a movement with respect to each other.

In testimony whereof I have hereunto set my hand inthe presence of two witnesses. VALDEMAR POULSEN.

Witnesses:

E. S. HAYEMANN, P. V. PEDERSEN.

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