US2336768A - Telephone signal receiver - Google Patents

Telephone signal receiver Download PDF

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Publication number
US2336768A
US2336768A US297576A US29757639A US2336768A US 2336768 A US2336768 A US 2336768A US 297576 A US297576 A US 297576A US 29757639 A US29757639 A US 29757639A US 2336768 A US2336768 A US 2336768A
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Prior art keywords
voltage
signal
impulses
circuit
grid
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Expired - Lifetime
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US297576A
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English (en)
Inventor
Six Willem
Fremery Frank De
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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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
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/14—Arrangements providing for calling or supervisory signals

Definitions

  • This invention relates to signal receivers such as are used in telephone practice for the reception of ringing or calling signals.
  • a carrier frequency of, say, 500 cycles per second which is interrupted periodically, for example, at a frequency of 20 cycles per second.
  • the calling signals consist of a series of successive impulses having a duration of A sec. and having a carrier frequency of 500 cycles per second.
  • a. signal receiver is provided whose circuit arrangement is such that it responds only to the signal currents and not to those speech-modulated currents which are received during the conversation and whose frequencies are equal or close to those of the signal.
  • the main object of our invention is toprovide a signal receiver of relatively simple construction which prevents false response of the signal circuit due to speech currents.
  • the signal receiver employs a time lag principle in such a manner that the signal circuit is not actuated until a definite number of successive impulses of the carrier frequency have been received within a definite time.
  • the interruption frequency obtained after rectification of the received signal is supplied to a network of condensers and rectifiers connected in a voltage-multiplier arrangement whose output circuit controls the signal circuit.
  • Figure 1 is a schematic diagram of a signal receiver according to the invention.
  • Figs. 2 to 12 are voltage-time curves showing the voltages at various points of the receiver of Figure l.
  • grid leak resistance In is connected across the grid and cathode of tube II.
  • the resistances 3 and 4 serve to increase the input impedance of the signal receiving circuit so that the shuntin effect on the telephone line is negligible.
  • the tube ll acts as a grid detector 50 that a voltage having the frequency of the interruptions of the signal currents as well as the frequency of the carrier current, is produced across a resistance l3 connected in series with a battery I5 in the plate circuit of triode l I.
  • a condenser I2 is connected between the plate and cathode of tube II.
  • the voltage component having the interruption frequency is supplied through a resistance I4 to a condenser I6.
  • the resistances l3 and I4 and the condensers l2 and [6 are given such values that the voltage E16, 1. e. the voltage across condenser l6, will be substantially equal to the voltage of the interruption-frequency superimposed upon a D. C. voltage E15 (later to be referred to) which is the D. C, voltage existing between the anode and the cathode of the tube I l.
  • this voltage Em is applied to a voltage-multiplier comprising a network of condensers l1, I9, 22 and 24, and rectifiers 20, 2
  • One output terminal 30 of the network is connected through a grid bias battery l8 to ground and the other terminal 34 is connected to the grid of an amplifying tube 26.
  • relay 2'! having a normally-open contact 40 adapted to control a signal circuit 28 has its coil connected in the plate circuit of tube 26.
  • the operation of the device of Figure 1 and the voltage across the different points thereof will be described in connection with the curves of Figures 2 to 12.
  • the curve of Figure 2 shows the signal impulses received over lines
  • Figure 3 shows the voltage Em across condenser l6. 1. e. between points 29 and 3
  • Figure 4 shows the voltage E11 across condenser H i. e.'the voltage between points 3
  • Figure 5 shows the volta e Ere-a: across the series connection of the rectifier 20 and the battery l8, 1. e. between point 33 and the grounded point 23.
  • Figure 6 shows the voltage Eat-a3 across rectifier 20 i. e. between points 33 and 30.
  • Figure 7 shows the voltage E19 across condenser I9 1. e. between points 30 and 32.
  • Figure 8 shows the voltage Eae-aa across rectifier 2
  • Figure 9 shows the voltage E22 across condenser 22 i. e. between points 33 and 35.
  • Figure 10 shows the voltage Ear-35 across rectifier 23 i. e. between points 32 and 35.
  • Figure 11 shows the voltage E2 across condenser 24 i. e. between points 32 and 34.
  • Figure 12 shows the grid voltage of tube 26 i. e. the voltage between points 29 and 34.
  • each of the condensers l9 and 24 is charged to a voltage E which is equal to the amplitude of the impulses of the voltage E16 on the condenser 18 (see Fig. 3) and is in a direction such that the point 32 is E volts more negative than point 30 and that point 34 in turn is E volts more negative than point 32.
  • a voltage of 2E volts exists across points 34 and 30. Consequently, when signal impulses are received over the lines I and 2 the negative bias of the grid of tube 26, which bias has value Eu; 1. e. the voltage of battery I8, is decreased by the amount 2E with the result that the anode current of tube 26 is decreased causing the relay 2] to become demagnetized and close contact 40 and thereby establish signal circuit 28.
  • the voltage on the grid of tube 26 varies in three steps, namely one step equal to E1a, a second step equal to (E1s-E) and a third step equal to (Em-2E).
  • the first step takes place at the end of the first impulse of 500 cycles (see Fig. 2)
  • the second step takes place at the end of the second impulse, i. e. & second later, and so on.
  • the grid voltage is E1a, i. e. during the first step, the anode current of tube 26 has so high a value that the armature 40 is open (as shown).
  • the armature is not released until the grid voltage reaches a value (E1anE), i. e. at the end of the nth impulse. It is clear that at least a multiplication of the voltage E by n must take place to deniagnetize .the relay at the end of a-series of impulses of 500/20 cycles.
  • the condensers I1, I21, 22 and 24 are given such capacities and the rectifiers 20, 2
  • the frequencies received are located outside the band of frequencies of from 480 to 520 cycles. These frequencies are not passed by the resonance circuit formed by winding 1 and condenser 8 at the entrance of the signal receiver and consequently cannot give cause to false response of the signal circuit 28.
  • the circuit-arrangement may be such that, instead of the signal circuit being established by a decrease in the grid voltage of tube 25 (a more negative grid voltage), it is established by an increase of the grid voltage (a more positive grid voltage).
  • the arrangement is such that, in the absence of calling signals, the current passing through the coil of relay 2'! is small and the armature is opened whereas upon the reception of calling signals the grid voltage of the tube 26 becomes more positive and the anode current thereof thereby magnetizing the relay 2! to attract armature 40 and establish the signal circuit 28.
  • a signal receiver for controlling a signal circuit from consecutive signal impulses transmitted by a periodically-interrupted carrier oscillation, comprising means for rectifying said carrier oscillation and deriving therefrom a number of voltage impulses corresponding to said signal impulses, means to multiply the voltage of said voltage impulses in an accumulative and step-like manner to produce an amplified voltage proportional to the number of said voltage impulses, and means actuated by the amplified voltage to control the signal circuit when the amplified voltage attains a value corresponding to a predetermined number of signal impulses.
  • a signal receiver for controlling a signal circuit from consecutive signal impulses transmitted by a periodically-interrupted carrier oscillation, comprising means for rectifying said carrier oscillation and deriving therefrom a number of voltage impulses corresponding to said signal impulses, means to multiply the voltage of said voltage impulses in an accumulative and steplike manner to produce an amplified voltage proportional to the number of said voltage impulses, said latter means comprising a plurality of condensers and rectifiers, the rectifiers being connected in series and a condenser shunting each pair of successive rectifiers, and means actuated by the amplified voltage to control the signal circuit when the amplified voltage attains a value corresponding to a predetermined number of si nal impulses.
  • a signal receiver for controlling a signal circuit from consecutive signal impulses transmitted by a periodically-interrupted carrier oscillation, comprising a resonance circuit tuned to the frequency of the oscillation, means for rectifying the oscillation passed by said resonance circuit and deriving therefrom a number of voltage impulses corresponding to said signal impulses, means to multiply the voltage of said voltage im pulses in an accumulative and step-like manner to produce an amplified voltage proportional to the number of said voltage impulses, said voltage multiplier comprising a plurality of series connected rectiflers and a plurality of condensers each shunting a pair of successive rectifiers,'and means actuated by the amplified voltage to control the signal circuit when the amplified voltage attains a value corresponding to a predetermined number of signal impulses.
  • a signal receiver for controlling a signal circuit from consecutive signal impulses transmitted by a periodically-interrupted carrier oscillation, comprising a resonance circuit tuned to the frequency of the oscillation, means for rectifying the oscillation passed by said resonance circuit and deriving therefrom a number of voltage impulses corresponding to said signal impulses, a
  • resistor and condenser connected in series across the output of said rectifying means, a voltage multiplier connected across said condenser and comprising a. plurality of series-connected rectifiers and a plurality of condensers each shunting a pair of successive rectifiers, a grid controlled tube, a grid circuit for said tube connected to the output of said voltage multiplier, a plate circuit for said tube, means in said plate circuit to control the signal circuit, said signal circuit being actuated only when the voltage derived from the voltage multiplier attains a value corresponding to a predetermined number of signal impulses. 1 1 WILLEM SIX.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Meter Arrangements (AREA)
US297576A 1938-09-12 1939-10-02 Telephone signal receiver Expired - Lifetime US2336768A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN42451A DE722560C (de) 1938-09-12 1938-09-12 Signalempfaenger

Publications (1)

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US2336768A true US2336768A (en) 1943-12-14

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US297576A Expired - Lifetime US2336768A (en) 1938-09-12 1939-10-02 Telephone signal receiver

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US (1) US2336768A (en))
BE (1) BE436359A (en))
DE (1) DE722560C (en))
FR (1) FR862367A (en))
GB (1) GB532597A (en))
NL (1) NL54271C (en))

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440049A (en) * 1945-06-30 1948-04-20 Rca Corp Electronic audio switch
US2490243A (en) * 1947-06-12 1949-12-06 Philco Corp Electronic cycle counting circuit
US2681386A (en) * 1948-07-13 1954-06-15 Automatic Telephone & Elect Electrical signaling system using nonlinear resistors for control
US2801290A (en) * 1951-09-17 1957-07-30 Telefunken Gmbh Calling signal responder arrangements
US3048660A (en) * 1958-07-31 1962-08-07 Bell Telephone Labor Inc Telephone pay station system
US3611940A (en) * 1948-02-27 1971-10-12 Us Navy Simplified proximity fuze and/or howitzer shells

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1053579B (de) * 1954-05-17 1959-03-26 Telefunken Gmbh Schaltungsanordnung fuer die Herstellung von Verbindungen in Fernmelde- und Fernsteueranlagen
US2830128A (en) * 1954-12-21 1958-04-08 Itt Condenser-timed delayed signal repeater

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440049A (en) * 1945-06-30 1948-04-20 Rca Corp Electronic audio switch
US2490243A (en) * 1947-06-12 1949-12-06 Philco Corp Electronic cycle counting circuit
US3611940A (en) * 1948-02-27 1971-10-12 Us Navy Simplified proximity fuze and/or howitzer shells
US2681386A (en) * 1948-07-13 1954-06-15 Automatic Telephone & Elect Electrical signaling system using nonlinear resistors for control
US2801290A (en) * 1951-09-17 1957-07-30 Telefunken Gmbh Calling signal responder arrangements
US3048660A (en) * 1958-07-31 1962-08-07 Bell Telephone Labor Inc Telephone pay station system

Also Published As

Publication number Publication date
DE722560C (de) 1943-05-20
FR862367A (fr) 1941-03-05
GB532597A (en) 1941-01-28
BE436359A (en)) 1939-10-31
NL54271C (en)) 1943-04-15

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