GB778978A - Improvements in or relating to multi-channel phase modulated carrier transmission systems - Google Patents

Improvements in or relating to multi-channel phase modulated carrier transmission systems

Info

Publication number
GB778978A
GB778978A GB1327155A GB1327155A GB778978A GB 778978 A GB778978 A GB 778978A GB 1327155 A GB1327155 A GB 1327155A GB 1327155 A GB1327155 A GB 1327155A GB 778978 A GB778978 A GB 778978A
Authority
GB
United Kingdom
Prior art keywords
channel
discriminator
phase modulated
relating
receiver
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
GB1327155A
Inventor
Peter Tyler
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 Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co Ltd
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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB1327155A priority Critical patent/GB778978A/en
Publication of GB778978A publication Critical patent/GB778978A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/20—Frequency-division multiplex systems in which at least one carrier is angle-modulated
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
    • H03D3/08—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of diodes, e.g. Foster-Seeley discriminator
    • H03D3/10—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of diodes, e.g. Foster-Seeley discriminator in which the diodes are simultaneously conducting during the same half period of the signal, e.g. radio detector

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

778,978. Phase modulation; multiplex radio signalling. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd. May 7, 1955, No. 13271/55. Drawings to Specification. Class 40(5) In a multi-channel phase modulation transmission system having channel filters at the transmitter and receiver for respectively combining and separating phase modulated-carriers corresponding to each channel and a discriminator of ratio detector type for each channel at the receiver, an integrating circuit follows, each discriminator both to equalize the frequency dependent response of the discriminator and to compensate for the non- linearity of the channel filters. The integrating circuit may be a series resistor and capacitor shunting the primary winding of on output transformer of the discriminator Due to the resistor higher audio frequencies are proportionally less shunted than lower frequencies and more constant output is maintained at higher frequencies.
GB1327155A 1955-05-07 1955-05-07 Improvements in or relating to multi-channel phase modulated carrier transmission systems Expired GB778978A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1327155A GB778978A (en) 1955-05-07 1955-05-07 Improvements in or relating to multi-channel phase modulated carrier transmission systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1327155A GB778978A (en) 1955-05-07 1955-05-07 Improvements in or relating to multi-channel phase modulated carrier transmission systems

Publications (1)

Publication Number Publication Date
GB778978A true GB778978A (en) 1957-07-17

Family

ID=10019939

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1327155A Expired GB778978A (en) 1955-05-07 1955-05-07 Improvements in or relating to multi-channel phase modulated carrier transmission systems

Country Status (1)

Country Link
GB (1) GB778978A (en)

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