US2285088A - Electric impulse generator - Google Patents

Electric impulse generator Download PDF

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Publication number
US2285088A
US2285088A US287197A US28719739A US2285088A US 2285088 A US2285088 A US 2285088A US 287197 A US287197 A US 287197A US 28719739 A US28719739 A US 28719739A US 2285088 A US2285088 A US 2285088A
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US
United States
Prior art keywords
winding
relay
circuit
contact
branch
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
Application number
US287197A
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English (en)
Inventor
Helmert Robert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2285088A publication Critical patent/US2285088A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone

Definitions

  • transmitting arrangement which is adapted to produce in an extremely simple manner the mixture of switching frequencies necessary for the aforesaid purpose.
  • transmitting arrangement comprises only a tone generator and a polarized relay.
  • the arrangement is such that the contact of the polarized relay shall, without the aid of auxiliary relays, act to change the frequency of the tone generator and also to control the relay itself.
  • the time constant of the relay circuit is selected in a well known manner so that the relay will operate at a desired third frequency.
  • a tone generator comprises an amplifier l having a tuned input and output mutually related by transformer means SU.
  • the tuned circuit which is so related to the input and output circuits of the amplifier, in
  • the form shown includes the inductance III/IV of the coupling to the amplifier and capacitance means. Further coupling means associated with the transformer SU provides an appropriate output connection for the circuit. 7
  • the tone generator is adapted alternately to supply a plurality of different frequencies, successively keyed in accordance with a tuned relation.
  • this successive supply of different frequencies is accomplished by providing means for successively changing the circuit constants of the tuned circuit.
  • a relay TR. having contacts tr is made in one contact position 8 to provide an oscillating circuit including capacitances C2 and C3, each shunting the winding III/IV, and in another contact position I the constants of the tuned circuits are changed by addition of capacitance C4 and a certain amount of resistance.
  • a signal of one frequency is produced, and in position 1 a signal of another frequency may result, as will be clear.
  • I provide means for operating the relay TR so that the tone generator will produce switching impulses of a plurality of frequencies for transmission alternately and at a predetermined rate.
  • relay TR has two windings V and VI connected on one side to a common point I, 2.
  • the relay windings are connected in parallel and each is supplied with biassing energy from an adjustable point on a potentiometer Rs, bridging a source of direct po.- tential; however, the circuit of winding V is provided with a capacitance C5 for purposes that will later become apparent.
  • a resistance R5 is connected between one side of the potentiometer R6 and the winding common point I, 2, and contact I of relay TB. is electrically associated with the relay winding side of resistance R5.
  • the other side of the potentiometer R6 is directly connected to the winding III/IV, which forms the inductance of the tuned circuit.
  • relay TR may be made to alternate in its position in accordance with the charge and discharge times of condenser C5, winding VI being effective as the operating winding and V as a delay winding.
  • a potentiometer R6 By adjusting a potentiometer R6 the two branch voltages which act upon relay TR with contact trl either opened or closed are predetermined and may be adjustably controlled. In accordance with the invention these branch voltages may be so adjusted that the operating time of relay TR shall be longer in one position than it is in the other, i. e., so that contact tr8 shall be open as long as it is closed, and vice versa. As a result each of the two frequencies to be emitted by the tone generator may be produced as long as the other.
  • the output of the tone generator may be employedlwithifurther circuits as a source of switching impulses'of two frequencies alternately emitted at a predetermined rate.
  • any circuit branch including a series condenser responds only to potential variations and is unaffected by constant D.. C. potentials superposed on such variations
  • a branch is connected in respect to potential variations efiectively between two specified points shall hereinafter mean that the branch is connected between two points whose potential variations are essentially the same as those of the specified points.
  • a signal generating arrangementifor alternately emitting two signal frequencies ata predetermined rate comprising a tone generator, a tuned circuit associated therewith having a plurality of component elements, and means for changing the effective value of said circuit comprisinga relay having two windings. an tarmature and a pair of contacts, one end of each of said windings being connected at a. common point and the other ends of said windings being separate, a resistance connected to said common point, a source of voltage, a voltage divider having first and second end terminals and an intermediate.
  • said time delay circuit comprises a condenser connected between the separate end of the other of saidwindings andsaid intermediate tap of saidpotentiometer.
  • A- signal generating arrangement for alternately emitting two signal frequencies at. a predetermined rate, which comprises a polar relay having an operating winding and a delay winding. and onlyone changeover contact setincluding first andsecond fixed contacts and a-movable conductor adapted to close. againstcsaid first or said second contact. responsive to energization of said operating winding in a givensense or the opposite sense respectively; firstcurrent supply means; a resistor; first operating connections connecting said first supply means in series with said operating winding. and said resistor with such polarity as tolenergize saidwinding in said given sense in the absence of other connections; further currentsupply means; further operating connections connecting said further supply meansin series with said operating winding, said conductor and said.
  • a condenser connected in series with said delay winding to form a-circuit branch responsive only to potential variations; means connecting said circuit branch effectivelyacross said operating winding in respect to potential variations, said delaywinding being poledtoinitially opposesaid operating winding in response to any abrupt potential variation; a tone generator having a tuned circuit-for controlling its frequency; and connections from said second contact and said movable conductor to twoflpoints of said tuned circuit for varying the frequency of said tuned circuit responsive to closure of said movable conductor against said second contact,
  • said first current supply andsaid further current supply are constituted by a common current source and anadjustable voltage dividing potentiometer connected across said source and tapped to form said first and second current supplies ROBERT HELMER'I.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Relay Circuits (AREA)
  • Transmitters (AREA)
US287197A 1938-07-30 1939-07-29 Electric impulse generator Expired - Lifetime US2285088A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL95315D DE724392C (de) 1938-07-30 1938-07-30 Schaltungsanordnung zur Erzeugung von zwei im Takt einer dritten Frequenz abwechselnden Tonfrequenzen fuer die Tonfrequenzwahl in Fernsprechanlagen

Publications (1)

Publication Number Publication Date
US2285088A true US2285088A (en) 1942-06-02

Family

ID=7288086

Family Applications (1)

Application Number Title Priority Date Filing Date
US287197A Expired - Lifetime US2285088A (en) 1938-07-30 1939-07-29 Electric impulse generator

Country Status (6)

Country Link
US (1) US2285088A (es)
BE (1) BE435699A (es)
CH (1) CH212069A (es)
DE (1) DE724392C (es)
FR (1) FR858470A (es)
NL (1) NL54870C (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510531A (en) * 1947-10-31 1950-06-06 Rca Corp Transmitter monitor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510531A (en) * 1947-10-31 1950-06-06 Rca Corp Transmitter monitor

Also Published As

Publication number Publication date
CH212069A (de) 1940-10-31
DE724392C (de) 1942-08-25
NL54870C (es)
FR858470A (fr) 1940-11-26
BE435699A (es)

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