US2265203A - Telephony - Google Patents
Telephony Download PDFInfo
- Publication number
- US2265203A US2265203A US270244A US27024439A US2265203A US 2265203 A US2265203 A US 2265203A US 270244 A US270244 A US 270244A US 27024439 A US27024439 A US 27024439A US 2265203 A US2265203 A US 2265203A
- Authority
- US
- United States
- Prior art keywords
- signal
- currents
- relay
- speech
- circuit
- 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
- 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
- My invention relates to telephony systems and more particularly to signal receivers for such systems.
- My invention is particularly concerned with signal receivers for receiving signalling currents which are transmitted directly or by carrier waves over a conductor which may also be used for speech transmission, and which currents have a frequency located in or adjacent to the frequency range of the speech currents or the speech sideband.
- signal receivers of the above type must be such that the signal circuit cannot be erroneously energized by speech currents of a frequency which is the same as or close to the frequency of the signal currents.
- the main object of my invention is to provide a signal receiver with which the signal circu't can be energized only by the signal currents.
- a further object is to provide a signal receiver which is simple in construction and reliable in operation.
- Figure II is a schematic diagram of a signal receiver according to another embodiment of the invention.
- the signal receiver shown in Figure I comprises a transformer 3 having a Primary winding 9 whose terminals I and 2 are adapted to be connected to a telephony transmission line (not shown) transmitting both low-frequency signal currents and speech currents. If the signal currents are transmitted by carrier wave over a conductor, the terminals I and 2 would be connected to the output circuit of a demodulator which demodulates both the modulated signal currents and the speech currents received. Thus, in any case both low-frequency signal currents and speech currents are supplied to terminals I and 2.
- Transformer 3 has a secondary winding ii tuned to the signal frequency by a condenser l, and having one end connected through a conductor H to the grid of a triode 5, which is connected as an anode rectifier, and having its other end connected through a biasing battery I! to the cathode of tube 5.
- the receiver also comprises two relays l3 and II having normally-open armatures l5 and I6 respectively connected in series in a signal circuit 6. Armature i5 acts instantaneously, whereas armature i6 acts with a predetermined time delay both in opening and closing. As time-delay relays of this type are well known in the art further description of the same is believed. unnecessary.
- the coils of relays i3 and H are connected in parallel in the plate circuit of tube 5 and for this purpose one end of each coil is connected through a conductor I! to the plate of tube 5, and the other ends of the coils are connected together and through a battery I and a conductor l8 to the cathode of tube 5, a condenser 8 connected across the plate and cathode of tube 5 serve to smooth the rectified plate current.
- the signal currents received at terminals I and 2 produce a rectified voltage across the coils of both relays l3 and H.
- Relay I3 is energized and armature i5 closes its contact practically instantaneously but relay I 4 becomes energized and armature it closes its contact only after a predetermined time interval.
- the signal circuit 8 is established only at a predetermined time after voltage is applied to the coils of relays i3 and I.
- the relay l3 opens and closes its armature ii in the rhythm of these impulses, the armature II of the relay It remains, however, closed due to the timelag of about lit-V10 second which is longer than the duration of each interval between two successive signal impulses.
- the receiver shown in Figur 2 is similar in many respects to that of Figure l and the same reference numerals are used to designate the same parts.
- the relay ll of Figure 1 which relay is energized and de-energized with a time-lag, is replaced by two relays 2. and 22 having normally-closed armatures 2
- the coil of relay 20 is connected in parallel with the coil of relay l3, whereas armature' 2! controls a circuit comprising the coil of relay 22 and a battery 24.
- Armature 23 is connected in series with-armature IS in the signal circuit 8.
- the signal receiver as shown in Fig. 2 has the advantage over that shown in Fig. 1, that the relay combination 20 and 22 contains relays which are only de-energized with a time-lag i. e. have v a time delay in only one direction.
- Such relays are more readily constructed than a relay such as the relay Id of Figure 1 which has to be energized as well as de-energized with a time-lag.
- a local signal circuit In a telephony system in which signal currents of a frequency at least close to the frequency range of the speech-currents or the speech side-band are transmitted over a conductor adapted to serve also for speech transmission, a local signal circuit, a signal receiver controlling said local signal circuit and comprising electroresponsive means including a contact connected in said circuit and adapted to close and open without time delays, second electro-responsive means including a contact connected in said circuit and adapted to close and open with predeterminedtime delays, and means to simultaneously energize both said means with a voltage produced by the signal currents and speech currents oi similar frequency.
- a local signal circuit In a telephony system in which signal currents of a frequency at least close to the frequency range of the speech-currents or the speech side-band are transmitted over a conductor adapted to serve also for speech transmission, a local signal circuit, a signal receiver controlling said local signal circuit and comprising an electro-magnetic relay having a contact connected in said circuit and adapted to close and open without a time delay, a second electromagnetic relay having a contact connected in said circuit and adapted to close and open with predetermined time delays, and means to simultaneously energize both relays with voltage pulses produced by the signal currents and speech currents of similar frequency,
- a local signal circuit in which signal currents of a frequency at least close to the frequency range of the speech-currents or the speech side-band are transmitted over a conductor adapted to serve also for-speech transmission, a local signal circuit, a signal receiver controlling said local signal circuit and comprising an electrical relay having a contact connected in said circuit and adapted to close and open without a time delay, a second electrical relay having a normally-closed contact adapted to open with a time delay, a circuit including said latter contact and a voltage supply, a third electrical relay having a coil in said latter circuit and a normallyopen contact in said signal circuit and adapted to open with a time delay, and means to simultaneously energize the first two relays with voltage pulses produced by the signal currents and speech currents of similar frequency.
- a local signal circuit in which signal currents of a frequency at least close to the frequency range of the speech-currents or the speech side-band are transmitted over a conductor adapted .to serve also for speech transmission, a local signal circuit, a signal receiver controlling said local signal circuit and comprising an electrical relay having a normally-open contact connected in said circuit and adapted to close and open without a time delay, a second electrical relay having a normally-open contact connected in said circuit and adapted to both close and open with predetermined time delays, and means to simultaneously energize both said relays with a voltage produced by the signal currents and by speech currents of similar frequency.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Relay Circuits (AREA)
- Mobile Radio Communication Systems (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE525676X | 1938-05-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2265203A true US2265203A (en) | 1941-12-09 |
Family
ID=6552697
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US270244A Expired - Lifetime US2265203A (en) | 1938-05-16 | 1939-04-26 | Telephony |
Country Status (4)
Country | Link |
---|---|
US (1) | US2265203A (fr) |
BE (1) | BE434364A (fr) |
FR (1) | FR854758A (fr) |
GB (1) | GB525676A (fr) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2456427A (en) * | 1944-11-28 | 1948-12-14 | Gen Electric | Protective system for electric motors |
US2483408A (en) * | 1945-03-26 | 1949-10-04 | Standard Telephones Cables Ltd | Relay circuit |
US2489391A (en) * | 1943-12-09 | 1949-11-29 | Photoswitch Inc | Thermally controlled electric relay |
US2496784A (en) * | 1947-02-21 | 1950-02-07 | Hartford Nat Bank & Trust Co | Receiver circuit-arrangement for low-frequency or carrier wave telephony systems |
US2516361A (en) * | 1945-08-21 | 1950-07-25 | Gen Railway Signal Co | Voice frequency signal device |
US2534895A (en) * | 1948-02-28 | 1950-12-19 | Westinghouse Electric Corp | Auxiliary power system for aircraft |
US2543309A (en) * | 1947-10-15 | 1951-02-27 | Andersson Ivan | Means for automatically operating a number of electric relays or solenoids at a preset time |
US2592825A (en) * | 1948-09-03 | 1952-04-15 | Gen Electric Co Ltd | Frequency difference indicator |
US2608608A (en) * | 1946-01-29 | 1952-08-26 | Ipsophon Patentgesellschaft A | Electrical relay system |
US2687500A (en) * | 1949-12-06 | 1954-08-24 | Westinghouse Electric Corp | Circuit interrupter |
US2689279A (en) * | 1949-09-21 | 1954-09-14 | Maurice J Noregaard | Electric switch |
US2706258A (en) * | 1951-06-16 | 1955-04-12 | Bell Telephone Labor Inc | Voltage testing circuit |
US2773221A (en) * | 1952-08-12 | 1956-12-04 | Columbia Broadcasting Syst Inc | Timing circuit |
US2776383A (en) * | 1952-04-21 | 1957-01-01 | Robotron Corp | Multi-function electronic timing circuit |
US2943588A (en) * | 1946-04-22 | 1960-07-05 | Martin G Sateren | Control system for torpedo |
US3048660A (en) * | 1958-07-31 | 1962-08-07 | Bell Telephone Labor Inc | Telephone pay station system |
US3209076A (en) * | 1961-01-07 | 1965-09-28 | Int Standard Electric Corp | Multi-frequency supervisory signal receiving system |
US3475561A (en) * | 1965-09-29 | 1969-10-28 | Superior Continental Corp | Telephone carrier system having selfcontained independently attachable line tap units |
-
0
- BE BE434364D patent/BE434364A/xx unknown
-
1939
- 1939-04-26 US US270244A patent/US2265203A/en not_active Expired - Lifetime
- 1939-05-13 GB GB14372/39A patent/GB525676A/en not_active Expired
- 1939-05-15 FR FR854758D patent/FR854758A/fr not_active Expired
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2489391A (en) * | 1943-12-09 | 1949-11-29 | Photoswitch Inc | Thermally controlled electric relay |
US2456427A (en) * | 1944-11-28 | 1948-12-14 | Gen Electric | Protective system for electric motors |
US2483408A (en) * | 1945-03-26 | 1949-10-04 | Standard Telephones Cables Ltd | Relay circuit |
US2516361A (en) * | 1945-08-21 | 1950-07-25 | Gen Railway Signal Co | Voice frequency signal device |
US2608608A (en) * | 1946-01-29 | 1952-08-26 | Ipsophon Patentgesellschaft A | Electrical relay system |
US2943588A (en) * | 1946-04-22 | 1960-07-05 | Martin G Sateren | Control system for torpedo |
US2496784A (en) * | 1947-02-21 | 1950-02-07 | Hartford Nat Bank & Trust Co | Receiver circuit-arrangement for low-frequency or carrier wave telephony systems |
US2543309A (en) * | 1947-10-15 | 1951-02-27 | Andersson Ivan | Means for automatically operating a number of electric relays or solenoids at a preset time |
US2534895A (en) * | 1948-02-28 | 1950-12-19 | Westinghouse Electric Corp | Auxiliary power system for aircraft |
US2592825A (en) * | 1948-09-03 | 1952-04-15 | Gen Electric Co Ltd | Frequency difference indicator |
US2689279A (en) * | 1949-09-21 | 1954-09-14 | Maurice J Noregaard | Electric switch |
US2687500A (en) * | 1949-12-06 | 1954-08-24 | Westinghouse Electric Corp | Circuit interrupter |
US2706258A (en) * | 1951-06-16 | 1955-04-12 | Bell Telephone Labor Inc | Voltage testing circuit |
US2776383A (en) * | 1952-04-21 | 1957-01-01 | Robotron Corp | Multi-function electronic timing circuit |
US2773221A (en) * | 1952-08-12 | 1956-12-04 | Columbia Broadcasting Syst Inc | Timing circuit |
US3048660A (en) * | 1958-07-31 | 1962-08-07 | Bell Telephone Labor Inc | Telephone pay station system |
US3209076A (en) * | 1961-01-07 | 1965-09-28 | Int Standard Electric Corp | Multi-frequency supervisory signal receiving system |
US3475561A (en) * | 1965-09-29 | 1969-10-28 | Superior Continental Corp | Telephone carrier system having selfcontained independently attachable line tap units |
Also Published As
Publication number | Publication date |
---|---|
FR854758A (fr) | 1940-04-24 |
GB525676A (en) | 1940-09-02 |
BE434364A (fr) |
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