GB694017A - Improvements in or relating to single-sideband carrier-wave communication apparatus - Google Patents

Improvements in or relating to single-sideband carrier-wave communication apparatus

Info

Publication number
GB694017A
GB694017A GB27778/51A GB2777851A GB694017A GB 694017 A GB694017 A GB 694017A GB 27778/51 A GB27778/51 A GB 27778/51A GB 2777851 A GB2777851 A GB 2777851A GB 694017 A GB694017 A GB 694017A
Authority
GB
United Kingdom
Prior art keywords
frequency
oscillations
mixers
source
mixer
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
GB27778/51A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB694017A publication Critical patent/GB694017A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/06—Arrangements for supplying the carrier waves ; Arrangements for supplying synchronisation signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/04—Frequency-transposition arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/06—Arrangements for supplying the carrier waves ; Arrangements for supplying synchronisation signals
    • H04J1/065—Synchronisation of carrier sources at the receiving station with the carrier source at the transmitting station

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

694,017. Automatic frequency control systems. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Nov. 27, 1951 [Nov. 30, 1950], No. 27778/51. Class 38 (iv). [Also in Group XL (c)] In a receiver handling two signals forming the lower and upper side-bands of a common carrier of frequency f, and in which each signal channel circuit comprises two frequency changing mixers separated by a single side-band filter, a common local oscillator feeds the channel mixers connected to the low-frequency end of the circuit and the local oscillations fed to the other mixers differ in frequency by double the frequency of the common oscillator, while the single side-band filters are identical. The receiving aerial feeds mixer 26 provided with oscillations of frequency f-1000 kc/s. from source 25 and the resultant band 996 to 1004 kc/s. is passed by filter 27 to the two identical channel circuits 22, 22<SP>1</SP>. The first mixers 28, 28<SP>1</SP> are supplied with oscillations of 940 and 1060 kc/s. respectively from source 35 and mixer 36, the latter also using the second harmonic of the 60 kc/s. source 31. The filters 30, 30<SP>1</SP> both pass the band 60.2 to 64 kc/s. to the mixers 29, 29<SP>1</SP> supplied with 60 kc/s. oscillations from common source 31 and the 0.2 to 4 kc/s. signal bands from the mixers, selected by filters 32, 32<SP>1</SP>, reproduce the two signals which are fed to the reproducers 34, 34<SP>1</SP>, respectively. The frequency of the 940 kc/s. source 35 is controlled by a thermionic reactance 41, to which is applied the output of the phase detector mixer 39, which compares the 60 kc/s. ,frequencies from source 31 and that present at the output of mixer 28<SP>1</SP> due to the presence in the received signal of a pilot oscillation of frequency f. The locally produced 940 and 1060 kc/s. oscillations may both be produced from the mixer 36 by applying thereto the output from a 1000 kc/s. oscillator and the 60 kc/s. oscillations.
GB27778/51A 1950-11-30 1951-11-27 Improvements in or relating to single-sideband carrier-wave communication apparatus Expired GB694017A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL694017X 1950-11-30

Publications (1)

Publication Number Publication Date
GB694017A true GB694017A (en) 1953-07-08

Family

ID=19808814

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27778/51A Expired GB694017A (en) 1950-11-30 1951-11-27 Improvements in or relating to single-sideband carrier-wave communication apparatus

Country Status (3)

Country Link
FR (1) FR1054158A (en)
GB (1) GB694017A (en)
NL (1) NL89167C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2162007A (en) * 1984-07-05 1986-01-22 Toshiba Kk Frequency converting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2162007A (en) * 1984-07-05 1986-01-22 Toshiba Kk Frequency converting circuit

Also Published As

Publication number Publication date
NL89167C (en)
FR1054158A (en) 1954-02-09

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