GB652262A - Electrical signalling system with a constant number of signal elements and two alternating current frequencies - Google Patents
Electrical signalling system with a constant number of signal elements and two alternating current frequenciesInfo
- Publication number
- GB652262A GB652262A GB33289/47A GB3328947A GB652262A GB 652262 A GB652262 A GB 652262A GB 33289/47 A GB33289/47 A GB 33289/47A GB 3328947 A GB3328947 A GB 3328947A GB 652262 A GB652262 A GB 652262A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- signal
- energizes
- impulse
- code
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
-
- 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
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mechanical Engineering (AREA)
- Credit Cards Or The Like (AREA)
- Relay Circuits (AREA)
Abstract
652,262. Electric selective signalling. STANDARD TELEPHONES & CABLES, Ltd. Dec. 17, 1947, No. 33289. Convention date, June 1, 1943. [Class 40 (i)] In a code signalling system each signal consists of a constant number of alternating current code elements at one or the other of two frequencies f1, f2. At the receiver each signal element steps a counter and recording means and the positions of the signal elements of one only of the frequencies (marks) are recorded in their relative sequential positions. Fig. 2 shows the receiver for a system using a four element code catering for ten different digits. The relays F1r, F2r respond respectively to impulses at frequencies f1 (space) and f2 (mark). On receipt of the first signal element the relay B1 energizes in series with the normally energized relay A1. Relay A2 energizes as the first impulse ends, and when the second impulse starts B2 energizes in series with A2 and A1, B1 relapse. Similarly, at the end of the second impulse A3 energizes, and at the start of the third impulse, B3 energizes in series with A3, and A2, B2 relapse, and so on for the fourth impulse at the end of which relays A4, B4 are held in series until receipt of the next signal. The counting relay chain A1, B1, &c. is sequentially operated in this manner by the received code elements, irrespective of the frequency thereof to step a recording unit correspondingly. When a code element is of frequency f2 earth is extended by the relay F2r to actuate the appropriate recording magnet R1 ... R4, according to the operative element of the counting relay chain, to record a " mark." Modification. A different number of signal elements may be used for the code and, in a modification, the relay F1r may be aperiodic or otherwise adapted to respond to either of the signal frequencies and alone operates the counting chain, relay F2r functioning exclusively to operate the respective recording magnets.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL652262X | 1943-06-01 | ||
| GB2206561A GB959476A (en) | 1961-06-19 | 1961-06-19 | Fluid flow control valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB652262A true GB652262A (en) | 1951-04-18 |
Family
ID=26255694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33289/47A Expired GB652262A (en) | 1943-06-01 | 1947-12-17 | Electrical signalling system with a constant number of signal elements and two alternating current frequencies |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE461666A (en) |
| FR (1) | FR959474A (en) |
| GB (1) | GB652262A (en) |
-
0
- FR FR959474D patent/FR959474A/fr not_active Expired
- BE BE461666D patent/BE461666A/xx unknown
-
1947
- 1947-12-17 GB GB33289/47A patent/GB652262A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE461666A (en) | |
| FR959474A (en) | 1950-03-30 |
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