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GB537378A - Electric modulation systems particularly for television - Google Patents

Electric modulation systems particularly for television

Info

Publication number
GB537378A
GB537378A GB32303/39A GB3230339A GB537378A GB 537378 A GB537378 A GB 537378A GB 32303/39 A GB32303/39 A GB 32303/39A GB 3230339 A GB3230339 A GB 3230339A GB 537378 A GB537378 A GB 537378A
Authority
GB
United Kingdom
Prior art keywords
signals
amplifier
filter
frequency
television
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
GB32303/39A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB537378A publication Critical patent/GB537378A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • H03C1/60—Modulators in which carrier or one sideband is wholly or partially suppressed with one sideband wholly or partially suppressed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/68—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for wholly or partially suppressing the carrier or one side band

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

537,378. Wireless transmitting systems. STANDARD TELEPHONES & CABLES, Ltd. Dec. 15, 1939 No. 32303. Convention date, Dec. 17, 1938. [Class 40 (v)] In a single side-band modulation system, particularly for television, the unwanted band is suppressed by an arrangement which involves the use of a second modulation by a carrier wave of twice the fundamental' frequency. The carrier of frequency F is modulated at M1 by television signals of frequency O-f, and part of the modulated signals passes through a filter F1 (passing mainly the lower side-band F to F-f) amplifier A1, and filter F2 to line c. The other part of the signals from modulator M1, comprising both side-bands, passes through amplifier A4, or network DC having a delay equal to that of filter Fl, and amplifier A3, to a second modulator M2. Part of the signals from filter F1 pass through amplifier A2 and cancel out the corresponding frequencies' passing over A4, DC, A3. The remaining frequencies modulate at M2 a carrier of frequency 2F, the resulting signals being amplified at A5 and combined with the signals coming through A1.
GB32303/39A 1938-12-17 1939-12-15 Electric modulation systems particularly for television Expired GB537378A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR537378X 1938-12-17

Publications (1)

Publication Number Publication Date
GB537378A true GB537378A (en) 1941-06-19

Family

ID=8927429

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32303/39A Expired GB537378A (en) 1938-12-17 1939-12-15 Electric modulation systems particularly for television

Country Status (1)

Country Link
GB (1) GB537378A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987617A (en) * 1956-10-19 1961-06-06 Hazeltine Research Inc Apparatus for converting a vestigialside-band carrier to a double-sideband carrier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987617A (en) * 1956-10-19 1961-06-06 Hazeltine Research Inc Apparatus for converting a vestigialside-band carrier to a double-sideband carrier

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