US1958166A - Electrical signal receiver - Google Patents

Electrical signal receiver Download PDF

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Publication number
US1958166A
US1958166A US241979A US24197927A US1958166A US 1958166 A US1958166 A US 1958166A US 241979 A US241979 A US 241979A US 24197927 A US24197927 A US 24197927A US 1958166 A US1958166 A US 1958166A
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US
United States
Prior art keywords
circuit
currents
signal
condenser
frequencies
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
US241979A
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English (en)
Inventor
Laurent Torbern
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of US1958166A publication Critical patent/US1958166A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/42—Circuits for by-passing of ringing signals
    • 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 invention relates to electrical signal receiv ers, particularly ringing signal receivers for use in connection with long distance telephone r lines provided with amplifying translators.
  • ringing currents of audio frequency are preferably'used as such currents may be passed through and amplified in the translators without any additional auxiliary means being required for that purpose.
  • a general condition for the construction of such receivers is that the receiver shall operate reliably for ringing currents of a certain audio frequency while being unaffected by ordinary speech currents.
  • the present invention has for its object to provide a signal receiver which fulfills this condition in a more perfect manner than has been possible heretofore and which is capable of being connected up between the two branches of the telephone line, directly or through a transformer, at any point desired.
  • the invention is based on the following principles.
  • the signal receiver should operate for a current of a pure audio frequency which as to the value of the frequency and the incoming energy as well as its duration is confined within certain limits. With a view to securing a reliable and efficient service said limits should be rather spacious. Considering, however, that the frequencies occurring in speech may momentarily meet the said conditions for the ringing signal current, it will be necessary to take measures for preventing disturbances by the speech. This is realized according to the present invention by providing a blocking device responding to currents of audio frequency other than those covered by the ringing signals and adapted to put the Signal receiver in an inoperative condition.
  • this blocking device is based on the fact that such tones of the speech which are most apt to affect the signal receiver, are never quite pure and, moreover, are of a very short duration in the course of ordinary speech.
  • the fact last mentioned is taken advantage of by constructing said blockingdevice and the signal receiver so that the former will respond more quickly to the speech currents than the latter, whereas, after having once been made operative, it will be slow to regain its inoperative condition.
  • I 50 The invention will be more closely described with reference to the accompanying drawing which illustrates three different circuit arrangements for a signal receiver.
  • Fig. 1 is a circuit diagram of the first embodiment.
  • Figs. 2 and 3 are corresponding circuit diagrams of the 2nd and the 3rd embodiment respectively.
  • the circuit of the signal apparatus 1 is controlled by two relays 2, 3, included in the anode circuits of two rectifying valves 4, 5 69 respectively the grid circuits of which include the secondary windings of transformers 6, 7 and grid potential batteries 8, 9 respectively.
  • the primary windings of saidtransformers are connected in series in the anode circuit of an amplifier valve 10 the grid and cathode of which are connected to the terminals 11, 12.
  • A. battery 14 furnishes the current for the anode circuit.
  • Bridged across the primary windings of the transformers 6, '7 are resonance shunts 15, 16 respectively, which are both tuned to the frequency of the signal current.
  • the shunt is a potential shunt having an inductance and a capacity connected in parallel, whereas 16 is a current shunt having an inductance and a capacity connected in series.
  • the transformer 7 and the appertaining circuits constitute a blocking device adapted 81? to make the receiver inoperative to currents of signal frequencies occurring in the speech.
  • the signal receiver is adapted to be connected up to the telephone line by the terminals l1, 12, being connected each to a branch of the line. $5 A signal current sent over the telephone line will then produce an alternating current potential in the secondary winding of the transformer 6, causing the relay 2 to operate and to close the circuit of the signal apparatus 1 at the W contact 1'7, whereas the relay 3 remains unoperated owing to the shunt 16 acting as a shortcircuit to the primary winding of the transformer 7 for currents of the signal frequency.
  • the blocking device by making the relay 3 slow to release its armature so as to keep its armature attracted during the short intervals of the speech when currents of signal frequency or about that frequency occur.
  • said methods may be arranged to cooperate for the purpose'aimed at. It remains to consider the operation of the receiver at the very moment when a wave train of speech currents of signal frequencies enters the receiver and when both relays 2, 3 are still unoperated. At this moment the shunt 15 will at first act in known manner as a short-circuit, whereas the shunt 16 will act as a great resistance. As a consequence, the blocking device will enter into operation and will open the contact 18 in the signal circuit before the relay 2 attracts its armature, thus preventing false signal also in this particular case.
  • the circuit of the signal apparatus 1 is controlled by a single relay 19, included in the anode circuit of a valve 20.
  • the grid circuit of said valve includes a grid leak 21 shunted by a condenser 22, and two batteries 23, .24, supplying a negative grid potential of such a value that the anode current is practically zero in the normal or in operative condition of the receiving device.
  • a glow lamp 25 and 26 respectively such as a neon lamp having builtir. resistances 27 and 2.8 respectively.
  • any discharge gap capable of independent discharge may be used.
  • the secondary winding of the transformer 6 is connected at one end to the grid of the valve 20 through the neon lamp 25 and. a resistance 27 and at the other end to the positive pole of the neon lamp battery 23.
  • the secondary winding of the transformer 7 is connected at one end to the grid of the valve 20 through the neon lamp 26 and resistance 28 and at the other end to the negative pole of another neon lamp battery 29.
  • the voltage of the neon lamp batteries is not itself sufficient to cause glowing of the lamps, which therefore normally act as interruptions in the secondary circuits of the transformers. The voltage generated in the secondary circuits by the signal and speech currents will, however,
  • the transformer 7 will come into operation causing the neon lamp 26 to glow whereby the upper plate of the condenser 22 will be charged negatively from the battery 29.
  • the valve 20 will consequently still allow no anode current to pass through it. If during this condition speech currents of such frequencies which are apt to cause operation of the signal apparatus, would enter the receiver, the glow lamp 25 would operate to supply a positive charge to the .condenser 22. It will be found, however, that in speech the negative charging is favoured to such an extent in preference to the positive one that the latterwill never predominate. This result is secured chiefly by the fact that the condenser 22 is relatively slow to discharge through the leak 21 and its negative charge w'll therefore be preserved till frequencies other can the signal frequencies again predominate.
  • the condenser 22 should preferably be of such capacity so as to be charged by a small amount of energy, and the leak 21 should have such a resistance as to produce the slow action in the discharge of the condenser required for a reliable operation of the device.
  • the action of a'.wave front is the same in this circuit arrangement as in that of Figure 1.
  • the sluggishness of the signal circuit at this instance can be increased, if necessary by introducing an additional resistance in series with the glow lamp 25.
  • the arrangement according to Figure 2 has the further advantage that disturbing currents, the energy of which is generally rather small, have no influence on the signal receiver at all as such feeble currents are unable to cause the gleamlamps to gleam.
  • a 500-period current modulated with terns where a ringing signal is-sent over a wire connection as in the examples described above but may be used generally for wire or wireless systems.
  • the ringing signal cur-- rents may be transmitted with or without the aid of a carrier wave.
  • a receiving devicein an electric communication system comprising in combination a signalling circuit adapted to select signalling frequencies within a certain frequency range, a blocking circuit adapted to be passed by currents of other frequencies than the signalling frequencies, a valve device, signalling means controlled by'said valve device, means connecting the grid circuit of the valve device with the signalling circuit and means connecting the grid circuit of the valve with the blocking circuit in such a manner as to make the valve inoperative upon energization of the blocking circuit by such currents.
  • a receiving device in an electric communication system comprising in combination a signalling circuit adapted to select signalling frequencies within a certain frequency range, a
  • blocking circuit adapted to be passed by ourrents of other frequencies than the signalling and the blocking circuit in such a manner as to cause the condenser to be charged with different polarities by currents passed through the signalling circuit and the blocking circuit respectively.
  • a receiving device in an electric communication system comprising in combination a signalling circuit adapted to select signalling frequencies within a certain frequency range, a blocking circuit adapted-to be passed by currents of other frequencies than the signalling frequencies, rectifying discharge devices in said circuits, a valve device, signalling means controlled by said valve device, a condenser included in the grid circuit of the valve device, means connecting the condenser with the signalling circuit and the blocking circuit in such a manner as to cause the condenser to be charged with different polarities by currents passed. through the signallingcircuit and the blocking circuit respectively.
  • the said condenser being arranged to be charged by currents in the signalling circuit so as to make the valve operative.
  • a receiving device as claimed in claim 2 characterized by the said condenser being arranged to be charged by currents in the blocking circuit so as to make the valve inoperative.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Devices For Supply Of Signal Current (AREA)
US241979A 1927-01-04 1927-12-22 Electrical signal receiver Expired - Lifetime US1958166A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE283135T 1927-01-04

Publications (1)

Publication Number Publication Date
US1958166A true US1958166A (en) 1934-05-08

Family

ID=31944976

Family Applications (1)

Application Number Title Priority Date Filing Date
US241979A Expired - Lifetime US1958166A (en) 1927-01-04 1927-12-22 Electrical signal receiver

Country Status (5)

Country Link
US (1) US1958166A (de)
BE (1) BE347704A (de)
DE (1) DE609601C (de)
GB (1) GB283135A (de)
NL (2) NL39470B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468555A (en) * 1943-03-08 1949-04-26 Comp Generale Electricite Multiple modulation carrier frequency telephone system
US2496784A (en) * 1947-02-21 1950-02-07 Hartford Nat Bank & Trust Co Receiver circuit-arrangement for low-frequency or carrier wave telephony systems
US2511617A (en) * 1946-10-11 1950-06-13 Bell Telephone Laboroatories I Power line carrier frequency telephone system
US2537998A (en) * 1946-05-18 1951-01-16 Int Standard Electric Corp Electrical signaling system
US2549803A (en) * 1945-12-20 1951-04-24 Int Standard Electric Corp Transmission system for controls and signals for toll or long distance telephone circuits
US2580973A (en) * 1945-04-14 1952-01-01 Sueur Rene Pulse signaling means
DE841765C (de) * 1948-10-02 1952-06-19 Normalzeit G M B H Schaltungsanordnung fuer Fernsprechanlagen mit Tonfrequenzwahl
US2654002A (en) * 1950-03-17 1953-09-29 Hartford Nat Bank & Trust Co Circuit-arrangement in a telephone system for the reception of signals
US2935731A (en) * 1957-02-26 1960-05-03 Richter Robert Selective signalling system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742806C (de) * 1938-09-01 1943-12-11 Siemens Ag UEbertragungssystem mit Pegelregulierung durch eine Steuerfrequenz, bei dem das Ansprechen des Steuerfrequenzempfaengers auf die Nutzfrequenzen verhindert ist
DE745228C (de) * 1939-07-28 1944-03-01 Siemens Ag Elektrischer Signalempfaenger
DE954519C (de) * 1951-12-13 1956-12-20 Standard Elek K Ag Schaltungsanordnung zum Empfang von Ruf- und Wahlzeichen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468555A (en) * 1943-03-08 1949-04-26 Comp Generale Electricite Multiple modulation carrier frequency telephone system
US2580973A (en) * 1945-04-14 1952-01-01 Sueur Rene Pulse signaling means
US2549803A (en) * 1945-12-20 1951-04-24 Int Standard Electric Corp Transmission system for controls and signals for toll or long distance telephone circuits
US2537998A (en) * 1946-05-18 1951-01-16 Int Standard Electric Corp Electrical signaling system
US2511617A (en) * 1946-10-11 1950-06-13 Bell Telephone Laboroatories I Power line carrier frequency telephone system
US2496784A (en) * 1947-02-21 1950-02-07 Hartford Nat Bank & Trust Co Receiver circuit-arrangement for low-frequency or carrier wave telephony systems
DE841765C (de) * 1948-10-02 1952-06-19 Normalzeit G M B H Schaltungsanordnung fuer Fernsprechanlagen mit Tonfrequenzwahl
US2654002A (en) * 1950-03-17 1953-09-29 Hartford Nat Bank & Trust Co Circuit-arrangement in a telephone system for the reception of signals
US2935731A (en) * 1957-02-26 1960-05-03 Richter Robert Selective signalling system

Also Published As

Publication number Publication date
NL39470B (de)
GB283135A (de) 1928-03-29
DE609601C (de) 1935-02-23
BE347704A (de)
NL26143C (de)

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