GB659020A - Improvements relating to electrical systems of transmission by code pulses - Google Patents
Improvements relating to electrical systems of transmission by code pulsesInfo
- Publication number
- GB659020A GB659020A GB19559/49A GB1955949A GB659020A GB 659020 A GB659020 A GB 659020A GB 19559/49 A GB19559/49 A GB 19559/49A GB 1955949 A GB1955949 A GB 1955949A GB 659020 A GB659020 A GB 659020A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulse
- valve
- input
- duration
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/14—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Dc Digital Transmission (AREA)
- Manipulation Of Pulses (AREA)
- Plasma Technology (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
659,020. Pulse code modulation circuits. LIBOIS, L. J., and GLOESS, P. F. M. July 25, 1949, No. 19559. Convention date, Aug. 5, 1948. [Class 40 (v)] Duration modulated pulses are translated into groups of binary code pulses by a succession of circuits in each of which the input pulse duration is compared with a reference time interval, a code pulse being generated if the duration of the input pulse exceeds the reference interval and a pulse of the excess duration being passed to the next circuit, while if the reference interval exceeds the input pulse duration no code pulse is generated and the input pulse is passed unchanged to the next circuit. The reference intervals in the successive circuits are each one half of that in the preceding circuit. In the embodiment described, the negative input pulse 23, Fig. 2, having a fixed leading edge and a modulated trailing edge, is inverted in valve 24, to produce pulse 28 which is fed to valve 34. It is also displaced by the reference time interval, T/2 in this case, where T is the maximum duration of the input pulses, this being effected by a delay line 25. The pulse is applied to the input 27, which is correctly terminated and is reflected from the unterminated end 26 to reappear at the input end where it is added to the pulse 28 to produce the composite pulse 32 at the grid of valve 34. As shown, the input pulse duration t is greater than T/2 so that the pulse 32 has a part 33 of greater amplitude than pulse 28 and of duration t-T/2. Valve 34 acts as a clipper passing pulse 33 to produce pulse 38 which is fed to the next coding stage input valve 70. In addition, the composite pulse 32 is fed to the control grid of pentode 39 which is cut off for the duration of the input pulse 23 by applying this pulse to its suppressor grid. The output from valve 39 is thus a pulse 41 of duration T/2 delayed by t with respect to pulse 23. The transformer 44 in the anode circuit of valve 34 inverts and differentiates the pulse 38 to produce the pair of pulses 46, 47, that corresponding to the leading edge of 38 being used to trigger a flip-flop circuit 48. The latter produces a negative pulse 50 of duration T which with the positive pulse 41, which occurs within it, is applied to the grid of valve 42. The positive pulse 41 is thus unable to unblock valve 42 to pass the input pulse 23 to the next stage, which would have occurred if it had been of less duration than T/2. The code pulse is generated by differentiating the pulse 57 on the right-hand anode of valve 48 and using the resultant leading edge pulse 61 which is fed to the mixer 64, the negative trailing edge pulse being clipped by rectifier 65. The remainder of the circuit shows a second coding stage for deriving the next digit, and pulses are shown which occur when the input pulse duration is less than T/4, the reference time interval for this stage. In this case, the composite pulse 80, corresponding to pulse 32, is unable to unblock valve 76, so that no pulse therefrom reaches the input valve 90 of the next stage. Also, the flip-flop valve 84 remains untriggered so that the pulse 86, which is a delayed version of the input pulse 38 derived from the second element of the composite pulse 80 in valve 78, is able to unbreak valve 87, to transmit pulse 89 to the next input valve 90. No code pulse is fed to the mixer 64 by the flip-flop valve 84 in the case considered. The final and nth coding stage comprises the input valve 101, Fig. 5, and a delay line 104 by which the composite pulse 107 is produced as in the other stages. As shown, the input pulse duration exceeds the reference time interval T/2n so that pulse 107 has a portion able to unblock valve 108 and produce a pulse 111 which after differentiation provides a code pulse 113 to be fed to the mixer 64. The mixer 64 consists of a delay line, to tappings on which the code pulse outputs are fed, and which are selected to time and arrange the code pulses to form a group 69 having the desired spacing and order of the pulses, which are also shaped in circuit 67.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR278421X | 1948-08-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB659020A true GB659020A (en) | 1951-10-17 |
Family
ID=8886568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19559/49A Expired GB659020A (en) | 1948-08-05 | 1949-07-25 | Improvements relating to electrical systems of transmission by code pulses |
Country Status (7)
Country | Link |
---|---|
US (1) | US2485821A (en) |
BE (1) | BE490359A (en) |
CH (1) | CH278421A (en) |
DE (1) | DE824067C (en) |
FR (1) | FR970030A (en) |
GB (1) | GB659020A (en) |
NL (1) | NL82618C (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL80113C (en) * | 1948-07-21 | |||
US2560289A (en) * | 1948-12-31 | 1951-07-10 | Olive S Petty | Pulsed distance measuring instrument |
US2643819A (en) * | 1949-08-11 | 1953-06-30 | Research Corp | Apparatus for computing correlation functions |
US2645712A (en) * | 1949-12-01 | 1953-07-14 | Rca Corp | Reading circuit for storage tubes |
US2616965A (en) * | 1950-03-22 | 1952-11-04 | Raytheon Mfg Co | Binary coding device |
US2625600A (en) * | 1951-05-03 | 1953-01-13 | Bendix Aviat Corp | Decoding information translator |
DE969435C (en) * | 1952-08-01 | 1958-06-04 | Int Standard Electric Corp | Arrangement for converting phase-modulated pulses into code signals |
FR1071074A (en) * | 1952-08-13 | 1954-08-24 | Labo Cent Telecommunicat | Circuit for encoding information in the form of electrical pulses |
FR1081240A (en) * | 1953-04-28 | 1954-12-16 | Radio Electr Soc Fr | Improvements to encoders for pulse code modulation systems |
US2894254A (en) * | 1953-12-10 | 1959-07-07 | Raytheon Co | Conversion of binary coded information to pulse pattern form |
US3188624A (en) * | 1959-11-17 | 1965-06-08 | Radiation Inc | A/d converter |
US3247487A (en) * | 1960-04-19 | 1966-04-19 | Electronic Associates | Analog storage device |
GB1060836A (en) * | 1963-12-10 | 1967-03-08 | Standard Telephones Cables Ltd | Improvements in or relating to electrical circuits |
DE1225234B (en) * | 1965-05-17 | 1966-09-22 | Siemens Ag | Method and device for binary coding of continuously modulated message pulses |
US4630031A (en) * | 1983-12-27 | 1986-12-16 | Motorola, Inc. | Pulse-width discriminating A/D converter |
-
0
- BE BE490359D patent/BE490359A/xx unknown
- FR FR970030D patent/FR970030A/fr not_active Expired
- NL NL82618D patent/NL82618C/xx active
-
1949
- 1949-04-28 US US90252A patent/US2485821A/en not_active Expired - Lifetime
- 1949-07-13 CH CH278421D patent/CH278421A/en unknown
- 1949-07-25 GB GB19559/49A patent/GB659020A/en not_active Expired
-
1950
- 1950-07-01 DE DEG2836A patent/DE824067C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL82618C (en) | |
US2485821A (en) | 1949-10-25 |
CH278421A (en) | 1951-10-15 |
BE490359A (en) | |
FR970030A (en) | 1950-12-28 |
DE824067C (en) | 1951-12-10 |
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