US2414795A - Ringing control arrangement for two-way carrier telephone terminals - Google Patents
Ringing control arrangement for two-way carrier telephone terminals Download PDFInfo
- Publication number
- US2414795A US2414795A US591068A US59106845A US2414795A US 2414795 A US2414795 A US 2414795A US 591068 A US591068 A US 591068A US 59106845 A US59106845 A US 59106845A US 2414795 A US2414795 A US 2414795A
- Authority
- US
- United States
- Prior art keywords
- ringing
- carrier
- frequency
- tube
- voice frequency
- 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
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Classifications
-
- 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 ringing control arrangements especially adapted for use in carrier current telephone systems.
- a principal object is to provide an improved carrier communication system wherein the frequency or frequencies for control purposes, e. g. ringing control, is within the frequency range of the intelligence signal frequencies, and wherein an improved arrangement is provided for controlling the application of ringing current.
- Another object is to provide a carrier signalling system with a two-way terminal having an improved ringing current generator and switching arrangement associated therewith which can be selectively controlled by low frequency ringing currents in one direction and by voice frequency ringing currents in the opposite direction.
- a further object is to provide a voice frequency ringing current generator which in one set of signalling conditions acts as a highly selective amplifier discriminator, and as a ringing current generator of voice frequency in another set of conditions.
- a feature of the invention relates to an improved two-way carrier telephone terminal for connecting a carrier frequency channel to a trunking line or switchboard, and employing a grid-controlled tube having circuit connections for causing it to act as a regenerative amplifier for controlling ⁇ the switching-in of a low frequency ringing current, and also responsive to a low frequency ringing signal from the trunk line to convert the amplifier into a ringing-out generator of voice frequency ringing current.
- Another feature relates to an improved voice Y i frequency ringing current generator and intelligence signal discriminator, especially adapted for use in a two-way terminal between a carrier frequency channel and a voice frequency line.
- a further feature relates to a discriminator for discriminating between voice frequency intelligence signals and voice frequency ringing signals, employing an electron tube with associated circuits whereby the operating characteristics of the tube can-be converted from a selective amplifler to a relatively high level voice frequency ringing current generator.
- the drawing shows in somewhat generalized schematic form a two-branch two-way terminal which connects the low frequency or trunking line I to the carrier frequency channel 2.
- a low frequency ringing current e. g. 2O C. P. S.
- alternating current relay II Connected across condenser 8 in series with another condenser I0, is an alternating current relay II which operates in response to the 2() cycle ringing current, and at its armature I2 and associated front contact completes an operating circuit over conductor I3 through the winding of relay I4.
- a continuously operating carrier frequency generator tube I5 which may be of any well-known grid-controlled type. Merely for illustration it is shown as a pentode having its control grid coupled through the Oscillatory circuit I6, I1 in sustained feedback relation to a tuned oscillatory plate circuit comprising inductance I8 and parallel tuning condensers I9', 20, 2l for tuning the generator sharply tothe required carrier frequency.
- the carrier generator is coupled through any suitable coupling transformer 22 to any wellknown modulatory device or network 23.
- Modulator 23 is arranged to have its input supplied with voice frequency signals representing either intelligence or ringing control, so that there is appliedV to the band-pass filter 24 a voice frequency modulated carried which is further amplified in a suitable carrier frequency amplifier 25,
- relay I4 Also associated with relay I4 is a convertible amplier-to-cscillator tube 2l which, merely for illustration., is shown as of the pentode type.
- the tube 2T acts as a highly selective amplifier having a slight amount of regeneration to increase its selectivity.
- the control grid 28 is returned to the cathode 29 through winding 3l) of a voice frequency transformer 3
- Each of V:the windings" 32, 34 is tuned by a reV spective condenser 35, 31 to the voice frequency used for ringing.
- the elements 3l, 31 i constitute a sharply tuned ilter for the voicevv frequency ringing current
- Thus tube 2i does not operate as ringing current generator until a sufficient A. C. potential at the ringing frequency is applied to the grid 28.
- the output circuit of amplier 52 is coupled through condenser 53, over conductor d, armature 3S and associated back contact, to grid 23.
- tube 21 amplies it and the amplified signal is applied through armature il and its associated back contact of relay I4, thence through ⁇ rectifier 55 and a smoothing filter comprised of resistors 5E, 51 and condensers 58, 59. to the grid 28.
- the application of this additional l).V C. bias potential to grid v28 causes a proportionate increase in the D. C. plate current of tube 21 which flows through theY Winding of relay i to cause itto operate.
- relay 4 When relay 4 operates, it i connects the cycle ringing current over co-nductors 6i) through the armatures 3 and 9 and their respective front contacts to the line l.
- the hybrid coil 1 functions in the normal way to repeat the incoming intelligence from the output of the receiving amplifier- 52A through windings 5 and through the armatures and associated back contacts of relay l to the line l.
- the voice frequency signals which reach the grid 28 through condenser 53 are of insuicient level at the ringing frequency to convert the tube 21 from an amplifier to an oscillator generator.
- a two-way terminal of the character described comprising, a pair of branches for signalling in opposite directions, Va carrier oscillator, a device'effectivein one condition to act as an amplifier and in another condition to act as an ⁇ alternating current generatcn'means responsive to the application of a ringing signal to one end of said terminal to convert said device into a generator of alternating ringing current, and means for applying the generated currents to modulate the carrier from said oscillator and for applying the modulated carrier to the other end of said terminal.
- a two-Way terminal of the character described comprising, a pair of branches for signalling in opposite directions, a carrier oscillator, a device effective in one condition to act as a selective amplifier and in another condition to frequency ringing-in current to said one end ⁇ of the terminal.
- VA two-way carrier telephone terminal comv pricing
- a transmitting branch and a receiving branch means including a telephone line to apply a ringing control signal to one end of the terminal, means to apply a voice frequency ringing signal to the other end of the terminal, an amplifier which selectively amplies said voice frequency signal, means responsive to said amplification to produce a corresponding direct current component, and switching means responsive to said direct currentcomponent for disconnecting the said line from Said one end of the terminal and for applying a local ringing frequency to said line.
- a tvvo-way terminal according to claim 3 Vin which said amplifier is provided with circuit are rangements for converting it into an alternating current generator of voice frequency ringing current under control of the application of said ringing control signal to saidone end of the terminal.
- a two-Way carrier telephone terminal comprising a transmitting branch and a receiving branch, said transmitting branch having a carrier oscillator generator, a voicey frequency ringing generator of the feedback type Which is normally ineffective to generate ringing currents, means responsive to control signals applied to one end of said transmitting branch'to causesaid generator to generatavoice frequency ringing current under control of said feedback, and means to apply said voice frequency ringing currenttc modulate said carrier oscillator for impressing voice frequency modulated carrier on the other end of said transmitting branch.
- a two-way carrier telephone terminal com# prising a transmitting branch, a receiving branch, said transmitting branch having an associated carrier current generator, an electronv tube-common to both branches and normally acting-as tube, a relay for switching-in said feedback arrangement to cause said tube to generate voice frequency ringing current, means responsive to a low frequency ringing signal for controlling said relay, and means to modulate the carrier generator of the transmitting branch by said voice frequency ringing signal.
- a two-way carrier telephone terminal comprising a transmitting branch and a receiving branch, each branch having an associated carrier current generator, an electron tube common to both branches and normally acting as an amplifier, means in said receiving branch including said associated carrier current generator to deinodulate a received voice frequency ringing signal and applying it to the control grid of said electron tube whereby said voice frequency ringing signal is selectively amplified, means to rectify the amplified frequency signal in the plate current of said tube, mean-s to apply the rectified signal to the control grid of said tube to increase the D. C. plate current, vand a ringing control relay controlled by said increased D. C'. plate current.
- a carrier telephone voice frequency ringing control system an electron tube, a feedback arrangement for causing said tube to generate voice frequency ringing current, a relay for switching said feedback arrangement into and out of circuit with said tube, a rectifier arrangement connected in the plate circuit of said tube under control of said relay, means controlled over a telephone line for operating said relay, means to apply the voice frequency ringing signals received over said receiving branch to the control grid of said tube to cause a marked increase in the current through said rectifier, and means to apply said low frequency ringing signal to a telephone line in response to said rectified current.
- a voice frequency ringing current generatordiscriminator for carrier telephone terminals comprising an electron tube, a feedback arrangenient for said tube including a filter network sharply tuned to a voice frequency ringing signal, a rectifier arrangement connected between the plate and the control grid of said tube, a relay having contact-s effective in one position to conneet said rectifier arrangement in circuit with said grid and effective in another position to connect said feedback and filter in circuit, and means controlled over a telephone line for operating said relay.
- a voice frequency ringing current generator-discriminator in which said tube has its control grid connected to a telephone receiving branch whereby demodulated voice frequency ringing signal is applied to said grid, a switching relay, and a D. C. plate return circuit for said tube connected through said switching relay for applying low frequency ringing signals to said telephone line.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE465290D BE465290A (fr) | 1945-04-30 | ||
US591068A US2414795A (en) | 1945-04-30 | 1945-04-30 | Ringing control arrangement for two-way carrier telephone terminals |
FR926079D FR926079A (fr) | 1945-04-30 | 1946-04-26 | Perfectionnements aux systèmes téléphoniques à courants porteurs |
ES175948A ES175948A1 (es) | 1945-04-30 | 1946-11-29 | Mejoras en terminales telefonicos de onda portadora en dos sentidos con dispositivo de control de llamada |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US591068A US2414795A (en) | 1945-04-30 | 1945-04-30 | Ringing control arrangement for two-way carrier telephone terminals |
Publications (1)
Publication Number | Publication Date |
---|---|
US2414795A true US2414795A (en) | 1947-01-28 |
Family
ID=24364926
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US591068A Expired - Lifetime US2414795A (en) | 1945-04-30 | 1945-04-30 | Ringing control arrangement for two-way carrier telephone terminals |
Country Status (4)
Country | Link |
---|---|
US (1) | US2414795A (fr) |
BE (1) | BE465290A (fr) |
ES (1) | ES175948A1 (fr) |
FR (1) | FR926079A (fr) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2457830A (en) * | 1946-03-05 | 1949-01-04 | Jr George F Moynahan | Spot frequency oscillator system |
US2491263A (en) * | 1946-11-01 | 1949-12-13 | Automatic Elect Lab | Ringing system for voice current repeaters |
US2540299A (en) * | 1946-08-27 | 1951-02-06 | Borg George W Corp | Sound recording and reproducing apparatus |
US2585019A (en) * | 1945-02-06 | 1952-02-12 | Int Standard Electric Corp | Voice frequency signaling circuit |
US2610256A (en) * | 1949-11-05 | 1952-09-09 | Standard Telephones Cables Ltd | Dial set for carrier or 2-wire lines |
US2613279A (en) * | 1949-09-02 | 1952-10-07 | Cie Ind Des Telephones | Ringing and regulating device for carrier current transmission systems |
US2654003A (en) * | 1947-11-24 | 1953-09-29 | Int Electronics Co | Oscillator-amplifier circuits for magnetic recording and reproducing systems |
US2677726A (en) * | 1950-07-26 | 1954-05-04 | Bell Telephone Labor Inc | Signaling system for carrier telephone transmission |
US2682627A (en) * | 1949-01-25 | 1954-06-29 | Askania Regulator Co | Motor position control station arrangement |
US2745008A (en) * | 1952-10-08 | 1956-05-08 | Automatic Elect Lab | Electronic tone generator |
US2936367A (en) * | 1956-04-02 | 1960-05-10 | Westinghouse Air Brake Co | Transistor transceiver |
US2938081A (en) * | 1952-12-27 | 1960-05-24 | Gen Electric | Selective transmission system for telephonic ringing |
-
0
- BE BE465290D patent/BE465290A/xx unknown
-
1945
- 1945-04-30 US US591068A patent/US2414795A/en not_active Expired - Lifetime
-
1946
- 1946-04-26 FR FR926079D patent/FR926079A/fr not_active Expired
- 1946-11-29 ES ES175948A patent/ES175948A1/es not_active Expired
Non-Patent Citations (1)
Title |
---|
None * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2585019A (en) * | 1945-02-06 | 1952-02-12 | Int Standard Electric Corp | Voice frequency signaling circuit |
US2457830A (en) * | 1946-03-05 | 1949-01-04 | Jr George F Moynahan | Spot frequency oscillator system |
US2540299A (en) * | 1946-08-27 | 1951-02-06 | Borg George W Corp | Sound recording and reproducing apparatus |
US2491263A (en) * | 1946-11-01 | 1949-12-13 | Automatic Elect Lab | Ringing system for voice current repeaters |
US2654003A (en) * | 1947-11-24 | 1953-09-29 | Int Electronics Co | Oscillator-amplifier circuits for magnetic recording and reproducing systems |
US2682627A (en) * | 1949-01-25 | 1954-06-29 | Askania Regulator Co | Motor position control station arrangement |
US2613279A (en) * | 1949-09-02 | 1952-10-07 | Cie Ind Des Telephones | Ringing and regulating device for carrier current transmission systems |
US2610256A (en) * | 1949-11-05 | 1952-09-09 | Standard Telephones Cables Ltd | Dial set for carrier or 2-wire lines |
US2677726A (en) * | 1950-07-26 | 1954-05-04 | Bell Telephone Labor Inc | Signaling system for carrier telephone transmission |
US2745008A (en) * | 1952-10-08 | 1956-05-08 | Automatic Elect Lab | Electronic tone generator |
US2938081A (en) * | 1952-12-27 | 1960-05-24 | Gen Electric | Selective transmission system for telephonic ringing |
US2936367A (en) * | 1956-04-02 | 1960-05-10 | Westinghouse Air Brake Co | Transistor transceiver |
Also Published As
Publication number | Publication date |
---|---|
ES175948A1 (es) | 1947-01-01 |
FR926079A (fr) | 1947-09-22 |
BE465290A (fr) |
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