US2580973A - Pulse signaling means - Google Patents

Pulse signaling means Download PDF

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Publication number
US2580973A
US2580973A US767185A US76718547A US2580973A US 2580973 A US2580973 A US 2580973A US 767185 A US767185 A US 767185A US 76718547 A US76718547 A US 76718547A US 2580973 A US2580973 A US 2580973A
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United States
Prior art keywords
frequencies
channel
circuit
tube
time constant
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Expired - Lifetime
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US767185A
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English (en)
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Sueur Rene
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Individual
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Individual
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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

Definitions

  • the present invention relates to signal transmitting systems, and more particularly to systems in which signals of a definite frequency to be retransmitted are likely to be superimposed by frequencies, particuiarly voice frequencies, which are not to be retransmitted.
  • the time constant device has amuch smaller time-constant for. charging than for discharging. Therefore it blocks the disturbing frequencies practically immediately.
  • Fig. 1 is a circuit diagram showing theprinciple of the present invention
  • Fig. 2 is adiagram showing by way of example an embodiment of the present'invention.
  • Fig. 3 is the current-voltage characteristic of the circuit shown in Fig. 2.
  • the circuit includes two branch circuits connected in parallel and presently to be described more in detail.
  • the signals arrive at point a and are supplied to an amplifier .A.
  • the output of amplifier A branches at b in .two branch circuits l and 2. includes a first detector D1 andleads at cv to the Branch circuit l output device including a vacuum tube system L and a relay 1- connected in series.
  • Branch circuit 2 includes a filter F, a second detector D2, and a device CR charged. by the detector D2 in series and leads at d to the output device to which the first branch circuit is connected.
  • the filter F is tuned to pass all frequencies which are different from a predetermined frequency, say 2,000 cycles per sec., particularly voice frequencies.
  • the device CR has different time constants for charging and discharging, preferably a relatively small time constant for charging and a relatively large time constant for discharging.
  • Signals arrive at a and are amplified by the amplifier A. If the signals contain only the predetermined frequency which is not passed by the filter 'F, the signals proceed only along branch circuit I where they are rectified by detector D1. The rectified signals are supplied to 1y. Circuit l leads to the vacuum tube. system I which. energizes the relay r the armature of which moves in the rhythm of the signals and retransmits them.
  • Fig. 2 showing a diagram of an embodiment. of r the present invention
  • the point a. of Fig. I is formed by the output of a transformer T0 to the primary of which are applied the arriving signals.
  • the amplifier A of Fig; I is designed in Fig; 2'as a. vacuum tube 11 the controlgridof which is connected to the output" of transformer To.
  • the primaries of two transformers T1 and T2 are connected in series the secondaries of which feed the circuits 5 and 2.
  • respectivethe detector D1 shown as a, two-wayrectifier-shunted by a resistance R1 the positive terminal of which is connected to the control grid of a vacuum tube is which corresponds to the tube system L of Fig. 1.
  • Branch circuit 2- leads first to a filter F consisting of a suitable combination ofinductances and condensers, and then to a detector Dz shown as a-twd-way rectifier.
  • the filter'F allows any frequencydifferent from the predetermined frequency of, say, 2000cycles per second to pass.
  • the rectifier Dz' feeds the rectified signals to a resistance R: the negative terminal of which is connectedtdacathode of a diode is the anode of which is connected over a condenser Ca.
  • tc a resistance R2;
  • a relatively large resistance R3 is connected in parallel to condenser C3.
  • junction of the anode of diode f2, condenser 63 and resistance R3 is connected to the control grid of 'tube- I3 to which the positive. terminal of resist- 'an'ce R1 is also connected.
  • the relay 1" of Fig. 1 is connected in the anode circuit 'of' tube Is the relay 1" of Fig. 1 is connected.
  • the control grid of tube is which receives a positive bias from resistance R1, is biased by resistance Ra in a negative sense overcoming the bias by resistance R1 whenever signals arrive which contain frequencies different from the predetermined frequency of, say, 2000 cycles per second.
  • the negative biasing of the control grid of tube I is effected almost instantaneously upon the arrival cf signals having frequencies different from the predetermined frequency and the negative bias is maintained for some time owing to the large discharging time constant of condenser C3.
  • the filter F may be tuned to block any frequency differing from a plurality of predetermined frequencies.
  • a common input channel a transmission channel, means for coupling said transmission channel to said input channel for transmitting both said signal frequency and said disturbing frequencies, a blocking channel, means coupling said blocking channel to said input channel, a signal transfer device adapted to be controlled by a potential applied thereto, means coupling said transfer device to said transmission channel and to said blocking channel, filter means in said blocking channel for rejecting said desired signal frequency and for passing said disturbing frequencies. and means-including a time constant circuit in said blocking channel for producing a potential from said disturbing frequencies and for applying such potential to said transfer device to render it incapable of transferring said distributing frequencies from said .transmission channel.
  • a common input channel a transmission channel, means for coupling said transmission channel to said input channel for transmitting both said signal frequency and said disturbing frequencies, a blocking channel, means coupling said blocking channel to said input channel, a controllable electron tube, means connecting said tube to said transmission channel and to said blocking channel, filter means in said blocking channel.
  • a common input channel a transmission channel, means for coupling said transmission channel to said input channel for transmitting both said signal frequency and said disturbing frequencies, a grid-controlled electron tube and means connecting its input circuit to the output of said transmission channel, a blocking channel, means coupling said blocking channel to said input channel, filter means in said blocking channel for rejecting said desired signal frequency and for passing said disturbing frequencies, and means in said blocking channel including a time constant circuit connected to the input circuit of said tube for producing from said disturbing frequencies a potential effective to render said tube incapable of transferring such frequencies from said trans mission channel, said time constant circuit having a relatively small time constant for charging and a relatively large time constant for discharging.
  • acommon input channel a transmission channel, means for coupling said transmission channel to said input channel for transmitting both said signal frequency, and said disturbing frequencies, rectifier means and an output impedance in said transmission channel, a grid-controlled electron tube and means connecting its input circuit to said output impedance, a blocking channel, means coupling said blocking channel to said input channel, filter means in said blocking channel for rejecting said desired signal frequency and for passing said disturbing frequencies, rectifier means in said blocking channel connected to said filter means, a time constant circuit in said blocking channel connected to said rectifier means and operative to produce from said disturbing frequencies a potential capable of stopping signal transfer my said tube, and means connecting said time constant circuit to the in- I tube so as to render the tube incapable of transferring disturbing frequencies from said transmission channel.
  • said time constant circuit includes a condenser and a large resistor in shunt therewith.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Meter Arrangements (AREA)
US767185A 1945-04-14 1947-08-07 Pulse signaling means Expired - Lifetime US2580973A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR996042T 1945-04-14

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US2580973A true US2580973A (en) 1952-01-01

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US (1) US2580973A (fr)
FR (1) FR996042A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821683A (en) * 1952-11-25 1958-01-28 Jr Walter Koenig Waveform distortion compensator
US3004104A (en) * 1954-04-29 1961-10-10 Muzak Corp Identification of sound and like signals
US3501703A (en) * 1966-05-12 1970-03-17 Int Standard Electric Corp Circuit arrangement for a single or multi-frequency signal receiver,operating with a speech immunity circuit and limiting the signals received

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1958166A (en) * 1927-01-04 1934-05-08 Ericsson Telefon Ab L M Electrical signal receiver
US2020487A (en) * 1934-05-26 1935-11-12 Bell Telephone Labor Inc Electrical signaling
US2145053A (en) * 1936-11-18 1939-01-24 Bell Telephone Labor Inc Signaling system
US2282131A (en) * 1940-01-12 1942-05-05 Associated Electric Lab Inc Electrical signaling system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1958166A (en) * 1927-01-04 1934-05-08 Ericsson Telefon Ab L M Electrical signal receiver
US2020487A (en) * 1934-05-26 1935-11-12 Bell Telephone Labor Inc Electrical signaling
US2145053A (en) * 1936-11-18 1939-01-24 Bell Telephone Labor Inc Signaling system
US2282131A (en) * 1940-01-12 1942-05-05 Associated Electric Lab Inc Electrical signaling system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821683A (en) * 1952-11-25 1958-01-28 Jr Walter Koenig Waveform distortion compensator
US3004104A (en) * 1954-04-29 1961-10-10 Muzak Corp Identification of sound and like signals
US3501703A (en) * 1966-05-12 1970-03-17 Int Standard Electric Corp Circuit arrangement for a single or multi-frequency signal receiver,operating with a speech immunity circuit and limiting the signals received

Also Published As

Publication number Publication date
FR996042A (fr) 1951-12-12

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