GB1066922A - Demodulator - Google Patents

Demodulator

Info

Publication number
GB1066922A
GB1066922A GB1000165A GB1000165A GB1066922A GB 1066922 A GB1066922 A GB 1066922A GB 1000165 A GB1000165 A GB 1000165A GB 1000165 A GB1000165 A GB 1000165A GB 1066922 A GB1066922 A GB 1066922A
Authority
GB
United Kingdom
Prior art keywords
output
pulses
receiver
integrator
march
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
GB1000165A
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.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic Electric Laboratories Inc
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
Priority claimed from US352912A external-priority patent/US3349330A/en
Priority claimed from US372993A external-priority patent/US3343091A/en
Application filed by Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Publication of GB1066922A publication Critical patent/GB1066922A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2035—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
    • H03K9/04—Demodulating pulses which have been modulated with a continuously-variable signal of position-modulated pulses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation

Abstract

1,066,922. Data transmission; automatic exchange systems. AUTOMATIC ELECTRIC LABORATORIES Inc. March 9, 1965 [March 18, 1964; June 5, 1964], No. 10001/65. Headings H4P and H4K. The receiver in a system in which data is transmitted by carrier phase shift, N.R.Z. invert coding being employed, comprises a lowpass filter, which smoothes the received signal at the phase reversal points; and differentiating means to derive transition pulses from the filter output. The pulses pass to an integrating circuit which gives an output only when adjacent pulses are separated by more than a half cycle of the carrier, thereby indicating 1 bits, and also to means fed by the integrator, which gives an output indicating a 0 bit whenever there is no 1 bit from the integrator. The binary data thus produced passes to a shift register under the control of clock pulses derived from the received signals. The receiver forms part of a transceiver, there being means for preventing transmission during reception, and vice versa. The shift register is used at the transmitter input and at the receiver output. A telephone switching control system as described in Specification 1,066,921 is described for use in association with such transceivers.
GB1000165A 1964-03-18 1965-03-09 Demodulator Expired GB1066922A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US352912A US3349330A (en) 1964-03-18 1964-03-18 Diphase transceiver with modulatordemodulator isolation
US372993A US3343091A (en) 1964-06-05 1964-06-05 Diphase transmission system with noise pulse cancellation

Publications (1)

Publication Number Publication Date
GB1066922A true GB1066922A (en) 1967-04-26

Family

ID=26997702

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1000165A Expired GB1066922A (en) 1964-03-18 1965-03-09 Demodulator

Country Status (4)

Country Link
BE (1) BE661000A (en)
DE (1) DE1300139B (en)
FR (1) FR1523125A (en)
GB (1) GB1066922A (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1559642A (en) * 1923-08-28 1925-11-03 American Telephone & Telegraph Signaling with phase reversals
US3032745A (en) * 1959-04-07 1962-05-01 Electronic Associates Data transmission system
US3215779A (en) * 1961-02-24 1965-11-02 Hallicrafters Co Digital data conversion and transmission system
US3156893A (en) * 1962-08-17 1964-11-10 Rca Corp Self-referenced digital pm receiving system
NL301228A (en) * 1963-01-23

Also Published As

Publication number Publication date
FR1523125A (en) 1968-05-03
DE1300139B (en) 1969-07-31
BE661000A (en) 1965-09-13

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