GB1129864A - Improvements in pulse telecommunication systems - Google Patents

Improvements in pulse telecommunication systems

Info

Publication number
GB1129864A
GB1129864A GB598266A GB598266A GB1129864A GB 1129864 A GB1129864 A GB 1129864A GB 598266 A GB598266 A GB 598266A GB 598266 A GB598266 A GB 598266A GB 1129864 A GB1129864 A GB 1129864A
Authority
GB
United Kingdom
Prior art keywords
code
pulses
transmitted
counter
shift
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
Application number
GB598266A
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of GB1129864A publication Critical patent/GB1129864A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/06—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation
    • H04B14/062—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using delta modulation or one-bit differential modulation [1DPCM]
    • H04B14/064—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using delta modulation or one-bit differential modulation [1DPCM] with adaptive feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/02—Delta modulation, i.e. one-bit differential modulation
    • H03M3/022—Delta modulation, i.e. one-bit differential modulation with adaptable step size, e.g. adaptive delta modulation [ADM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/046—Systems or methods for reducing noise or bandwidth

Abstract

1,129,864. Selective signalling. COMPAGNIE FRANCAISE THOMSON HOUSTON-HOTCHKISS BRANDT. 10 Feb., 1966 [10 Feb., 1965], No. 5982/66. Heading G4H. Delta modulation pulses, produced for example as described in Specification 1,106,042 are applied to a coding circuit comprising a counter which is stepped up or down by the pulses, means for translating the counter contents into a marking on one of a number e.g. 13 of leads to select a corresponding frequency for transmission, and means for subtracting from the counter a number corresponding to the frequency transmitted. Pulses are supplied to the counter over a sampling period. Several different codes are used to cater for different rates of charge of the input signal. In the lowest range, for example, frequencies F 1 to F 13 correspond to increments of + 12, + 8, + 6, + 4, + 3, + 2, 0, - 2, - 3 . . . -12 When F 1 or F 13 is transmitted, a shift to the next higher code is made, this code being one in which F 7 still corresponds to 0, but the other frequencies correspond to larger increments e.g. ranging from 16 to 3. Similar shifts up are made whenever F 1 or F 13 , signifying the largest possible increment in any code, is transmitted. Conversely, when the variation in a sampling period is less than the minimum increment of the code in force, F 7 is transmitted and a shift down is made. Whenever a shift up or down occurs, the translating matrix is modified or the attenuation of the input signal is altered correspondingly. The receiver comprises filters corresponding to F 1 -F 13 and a circuit which delivers to one of two outputs (positive and negative increments) a train of pulses in each sampling period, the number of pulses corresponding to the frequency received and the code in force. Code shifts up are made upon reception of F 1 or F 13 and a shift down is made on reception of F 7 , except when the lowest code is in force. The receiver is synchronized to the transmitter after transmission of F 7 over a number of sampling periods corresponding to the number of codes. The pulses delivered by this circuit constitute the original delta modulation and are demodulated by apparatus as described in Specification 1,106,042.
GB598266A 1965-02-10 1966-02-10 Improvements in pulse telecommunication systems Expired GB1129864A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR5032A FR1433419A (en) 1965-02-10 1965-02-10 Improvements to Pulse Telecommunications Systems

Publications (1)

Publication Number Publication Date
GB1129864A true GB1129864A (en) 1968-10-09

Family

ID=8570597

Family Applications (1)

Application Number Title Priority Date Filing Date
GB598266A Expired GB1129864A (en) 1965-02-10 1966-02-10 Improvements in pulse telecommunication systems

Country Status (5)

Country Link
BE (1) BE675877A (en)
DE (1) DE1284455B (en)
FR (1) FR1433419A (en)
GB (1) GB1129864A (en)
NL (1) NL6601531A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199455A (en) * 1986-08-11 1988-07-06 George Oscar Lernout System for analogue/digital/analogue conversion

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976995C (en) * 1946-08-10 1964-10-29 Int Standard Electric Corp Device for the transmission of electrical waves

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199455A (en) * 1986-08-11 1988-07-06 George Oscar Lernout System for analogue/digital/analogue conversion

Also Published As

Publication number Publication date
FR1433419A (en) 1966-04-01
DE1284455B (en) 1968-12-05
NL6601531A (en) 1966-08-11
BE675877A (en) 1966-08-01

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