US2053760A - Process and apparatus for registering and reproducing sounds - Google Patents

Process and apparatus for registering and reproducing sounds Download PDF

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Publication number
US2053760A
US2053760A US737718A US73771834A US2053760A US 2053760 A US2053760 A US 2053760A US 737718 A US737718 A US 737718A US 73771834 A US73771834 A US 73771834A US 2053760 A US2053760 A US 2053760A
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United States
Prior art keywords
switch
electromagnet
contacts
relay
sounds
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Expired - Lifetime
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US737718A
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English (en)
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Bedeschi Gaetano
Monti Gaetano
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Individual
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Individual
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor

Definitions

  • a process is already known for recording sounds on, a steel wire by means of electromagnetic impressions produced by the pulsating currents of a microtelephone, in which two electromagnets are used, the unlike poles of the magnet cores facing each other and the steel wire to be impressed being caused to run between the said poles.
  • the cancelling process contemplated by the invention consists in letting a pole of a perma-v nent magnet slide on the magnetic impressions of the wire, ribbon, drum or disc, thus determining the magnetic levelling which is a perfect one, since in this case all self-induction phenomena are absent.
  • the process essentially consists: For the registration of sounds; in letting the magnetic point of an electromagnet electrically connected (across a radiophonic amplifier) to a microphone or to a telephonic transmitter of the sounds to be recorded, .pass in a straight helicoidal or spiral line on a single surface ,of a cylinder or disc made of steel or other magnetic material,
  • the system may also be utilized for intercepting conversations or for registering sounds of any kind by means of a suitable microphone.v
  • FIG. 1 For a better understanding of the system at issue, to the present description are attached two diagrams ( Figures 1 and 2) of an'embodiment in which, only by way of example, the case of registration of sounds on, a steel'cylinder is considered; the system however is applicable, with convenient mechanical adaptations, alsov to discs and the like.
  • the diagram refers more precisely to an apparatus for the registration of microphonic or radiophonic sounds and for .their reproductions in a loud-speaker, the apparatus essentially comprising: i
  • a mechanical device A consisting of the sound registering electromagnet and the registering cylinder driven by an'electric motor;
  • a radiophonic set comprising an oscile lating set 3' separate from the low frequency amplifier C;
  • a relay G which serves to establish the A connection of the apparatus with the telephone line or with a determined microphone receiver of the sounds to be registered.
  • the apparatus is connected to a loud-speaker H or-to a headphone.
  • the mechanical apparatus A comprises a pref erably cast iron base I having a support 2 on which is mounted a steel cylinder 3 adapted to revolve about its axis, the shaft 4 of the cylinder being connected by pulley 5 and shaft 6 to an electric motor I mounted in the apparatus itself and fed, for instance, from the lighting line 8.
  • connection of the motor I with the said line is through: leads 9, switch i0, relay G and leads ll.
  • 2 revolvable about its axis and kinematically connected through gear wheels l3 to the shaft 4 of 'the cylinder 3 in such a manner that said. rod can revolve only in synchronism with the said cylinder.
  • a support I4 is screwed, this support carrying the electromagnet I5, so that the rotation of the rod
  • the electromagnet core i8 ends with a point in sliding contact with the cylinder 3.
  • the electromagnet I5 is electrically connected by leads H and H to the contacts l8 and I9 of the switch E, said contacts being connected to' the leads 20 and 2
  • the two movable contacts 26 and 21 of switch F are connected to the two outlet terminals 28 and 29 of the amplifler C.
  • , 32, 33 are the movable contacts of the change-over switch E; 34 and 35 are the movable contacts of the change-over switch D.
  • ! and 3 l are connected by leads to the stationary contacts 36 and 31 of the change-over switch F, while the contacts 32 and 33 are connected to the stationary contacts 38 and 39 of the change-over switch D.
  • of switch D are connected to the terminals 42 and 43 of the oscillating set B.
  • the contacts 44 and 45 of the'switch E are connected to the loud-speaker H.
  • the contacts 46 and 41 of the same switch E are connected through lead 48, lead 49 and relay G to the telephone line 5
  • and 52 are the inlet terminals of the amplifler, these terminals being connected to the movable contacts of the switch D.
  • the secondary of the microtelephone is connected (through the contacts 32 and 33 of switch E and through switch D) to the inlet terminals 5
  • the motor 1 fed from the lighting line determines the revolution of the steel cylinder 3 and of the screw l2; in its turn the screw l2 determines the longitudinal travelling motion of the electromagnet l5, the movable magnetic point of which, in combination with the rotation of the cylinder, will slide on the cylinder and describe an helicoidal line the pitch of which will be determined by the ratio of the wheelgear l3 and by the pitch of the screw l2.
  • the intensity variations in the electromagnet l5 determined by the electromagnetic variations in the microtelephone during the telephonic transmission, will be transformed into pulsating variations of the magnetic intensities of the core l6; these last variations will be registered on the cylinder 3 and will be retained by coercitive force.
  • the man who was speaking hangs up the microtelephone to the hook of his apparatus and by so doing, owing to the cessation of the current, determines the working of the relay G which interrupts the lighting circuit and consequently also the circuit of the motor I, thus automatically bringing to a stop the working of the apparatus.
  • the apparatus may also be used for radiophonic receptions alone; to this effect it suffices to set the switch D in the dotted position and o leave the other two switches in the position indicated on the drawings, which corresponds to the full line position.
  • Diagram of the Figure 2 represents the appa- 53 is the tering bobbin; L L are the terminals to which the telephone line is led; R.R, are the two terminals of the telephonic apparatus connected in parallel to .the multiple change-over switch X; 5'! is a contact controlled by the relay 55; 56 is a battery connected to the contacts 5'
  • To the relay 56 are led the two lines 62 and 63 which, at 64 65, are-connected to thescrew-threaded spindle 66 and to the stationary rod 61'. On said spindle 66 is screwed the support 68 of the bobbin l5, while on the rod 61 the movable contacts 69'l0-'ll are mounted.
  • the bobbin I5 is connected to the switches 20 and 2 i.
  • the telephone line is led to the telephone terminals L L
  • the switch 53 being maintained open, as soon as a call is made the current that causes the bell to ring attracts the armature of the relay 55 which operates the closure of the contact 51.
  • Contact 58 locks the armature of relay 56'; contact 59 closes the lighting line circuit in order to actuate the motor driving the sound-registering apparatus; contact 60 closes the contacts of the telephone hook.
  • the automatic switch works in the following manner:
  • a metal rod 61 is provided on and electrically insulated from the support of the screw 66, this support carrying a certain number of movable contacts, for instance 69'lll-'H, adapted to be moved away from each other in such a manner as to determine a given time-period taken by the bobbin-carrier I4 to enter in touch with a niovable contact and with the next one. Anytime the bobbin-carrier comes in touch with one of these movable contacts the circuit of the battery 56 is closed and the relay 56' is disconnected; the
  • the telephonic communication reaches the receiver at R-R.
  • the receiver is connected in are connected (through the switch and by means of the contacts 15 and 16) to the feed of the, bobbin l5 and loud-speaker H, the bobbin and the loud-speaker being connected with one an
  • the movable contacts 2l-20-ll l8 19-8ll must be carried into touch with the contacts 82-B l--8384-8586 respectively.
  • the terminal 16 of the bobbin will then be connected up (throughcontact 86) to the grid of the first pre-amplifying valve of the amplifier, and the terminal 75 will be connected tothe earth 5
  • the exit terminal 28 of the amplifier is connected, through contact 83, to the terminal ll of the loud-speaker; the exit terminal 29 of the amplifier is connected, through contact 84, to the other terminal 18 of the loud-speaker.
  • the changeover switch 12 In order to simultaneously register and hear the radiophonic communications, the changeover switch 12 should be moved into touch with 14, and the movable contacts of said switch should be moved into the positions 8l--88 -69- 909
  • the exit terminal 28 will then result to be connected, through the exitcontact 89, to the terminal 11 of the loud-speaker which is connected in series to the bobbin I5.
  • the exit terminal 29 of the amplifier is connected, through contact 88, to the bobbin terminal 16; the bobbin terminal 15 is connected to the loudspeaker at 93.
  • the changeover switch In order to obtain the repetition of the registered sounds, the changeover switch should be moved into its second position. I
  • Apparatus for electromagnetically recording sound upon steel objects such as steel cylinders, disks, bands and the like and ior repeating the recorded sounds comprising the combination, of a. microphone, a recording electromagnet, a loudspeaker having a coil, 2, low frequency amplifier interposed between said microphone and said electromagnet for recording, said amplifier including two low frequency stages in cascade, and at least'one pre-amplifying 'stage interposed before said two cascade stages, there being amultiple changeover switch for inserting solely. the two cascade stages for recording, and for inserting all three stages in series for reproducing or repeating.
  • Apparatus for electromagnetically recording sound upon steel objects such as steel cylinders, disks, bands and the like and for repeating the recorded sounds comprising the combination, of a microphone, a recording electromagnet, a loudspeaker having a coil, 9. low frequency amplifier interposed between said microphone and said electromagnet'ior recording, said amplifier including two low frequency stages in cascade, and two pre-amplifying stages interposed before said two cascade stages, there being a multiple changeover switch for inserting solely the two cascade stages for recording and for inserting all the four stages in series for reproducing or repeating.
  • Apparatus according to claim 1 including a relay and a battery for operating the same, there being driving means for the cylinder, disk, band or other steel object, which relay is capable of connecting the driving means with a current source and causing the recording electromagnet to be energized by connecting the same with a separate current source upon actuation 25 of said relay by an incoming telephone call and simultaneously connecting the recording electromagnet in shunt through the two low frequency cascade stages.
  • Apparatus according to claim 1 including a relayand a battery for operating the same, there being driving means for the cylinder, disk, band or other steel object, which relay is capable of connecting the driving means with a current source and causing the recording electromagnet to be energized by connecting the same with a separate current source upon actuation of said relay by an in oming telephone call and simultaneously connecting the recording electromagnet in shunt through the two low frequency cascade stages, a contact bearing rod having a plurality of contacts fixed thereon at predetermined distances capable of making contact with the recording electromagnet and effecting a short-circulting 01' the relay upon cessation of the telephone call and efiecting interruption of the connection with the current source and disengagement of the telephone apparatus.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Mobile Radio Communication Systems (AREA)
US737718A 1933-08-07 1934-07-31 Process and apparatus for registering and reproducing sounds Expired - Lifetime US2053760A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT182116X 1933-08-07
IT445343X 1934-07-18

Publications (1)

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US2053760A true US2053760A (en) 1936-09-08

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Application Number Title Priority Date Filing Date
US737718A Expired - Lifetime US2053760A (en) 1933-08-07 1934-07-31 Process and apparatus for registering and reproducing sounds

Country Status (4)

Country Link
US (1) US2053760A (fr)
CH (1) CH182116A (fr)
FR (1) FR778053A (fr)
GB (1) GB445343A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2572157A (en) * 1947-12-31 1951-10-23 Air King Products Co Inc Combination radio-wire recorder
US2745904A (en) * 1948-02-28 1956-05-15 Int Electronics Co Magnetic recording machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2572157A (en) * 1947-12-31 1951-10-23 Air King Products Co Inc Combination radio-wire recorder
US2745904A (en) * 1948-02-28 1956-05-15 Int Electronics Co Magnetic recording machine

Also Published As

Publication number Publication date
CH182116A (it) 1936-01-31
FR778053A (fr) 1935-03-08
GB445343A (en) 1936-04-07

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