FR2232894A1 - Transmission of one or more televisgn programmes - employs double modulation of video signals and single stage detection - Google Patents

Transmission of one or more televisgn programmes - employs double modulation of video signals and single stage detection

Info

Publication number
FR2232894A1
FR2232894A1 FR7321025A FR7321025A FR2232894A1 FR 2232894 A1 FR2232894 A1 FR 2232894A1 FR 7321025 A FR7321025 A FR 7321025A FR 7321025 A FR7321025 A FR 7321025A FR 2232894 A1 FR2232894 A1 FR 2232894A1
Authority
FR
France
Prior art keywords
transmission
televisgn
programmes
video signals
primary transmitter
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.)
Granted
Application number
FR7321025A
Other languages
French (fr)
Other versions
FR2232894B1 (en
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.)
LGT Laboratoire General des Telecommunications
Original Assignee
LGT Laboratoire General des Telecommunications
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 LGT Laboratoire General des Telecommunications filed Critical LGT Laboratoire General des Telecommunications
Priority to FR7321025A priority Critical patent/FR2232894A1/en
Priority to AR254058A priority patent/AR207449A1/en
Priority to CA201,743A priority patent/CA1033448A/en
Priority to IN1236/CAL/74A priority patent/IN142139B/en
Priority to BR4763/74A priority patent/BR7404763D0/en
Priority to AR258189A priority patent/AR207357A1/en
Publication of FR2232894A1 publication Critical patent/FR2232894A1/en
Priority to CA259,215A priority patent/CA1033051A/en
Application granted granted Critical
Publication of FR2232894B1 publication Critical patent/FR2232894B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
    • H04N5/40—Modulation circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/04—Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier
    • H04N7/045—Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier the carrier being frequency modulated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Television Systems (AREA)

Abstract

The system consists of a primary transmitter supplied for each transmission by a frequency modulated R.F. carrying the picture information and several secondary transceivers each capable of receiving the R.F. from the primary transmitter and changing it's frequency and a broadcast system suitable for public reception. The primary transmitter uses a centre frequency of 4GHz and a carrier elaboration circuit. The modulator output is fed via a passband filter and a correction circuit to a subtractive mixer using a local oscillator working at 31.8MHz giving a 0.9MHz amplitude modulated output. The crest to crest interval is 15MHz and modulater filter Pass-band 36MHz.
FR7321025A 1973-06-08 1973-06-08 Transmission of one or more televisgn programmes - employs double modulation of video signals and single stage detection Granted FR2232894A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
FR7321025A FR2232894A1 (en) 1973-06-08 1973-06-08 Transmission of one or more televisgn programmes - employs double modulation of video signals and single stage detection
AR254058A AR207449A1 (en) 1973-06-08 1974-01-01 PRIMARY EMITTER OF FREQUENCY MODULATION FOR A DEVICE FOR DIFFUSING TELEVISION PROGRAMS
CA201,743A CA1033448A (en) 1973-06-08 1974-06-05 Primary transmitter for t.v. programme broadcasting through receiver-secondary transmitters
IN1236/CAL/74A IN142139B (en) 1973-06-08 1974-06-06
BR4763/74A BR7404763D0 (en) 1973-06-08 1974-06-10 DEVICE FOR THE DISSEMINATION OF TELEVISION PROGRAMS FROM A PRIMARY FREQUENCY MODULATION ISSUER
AR258189A AR207357A1 (en) 1973-06-08 1975-01-01 SECONDARY RECEIVER-TRANSMITTER FOR A DEVICE FOR DIFFUSING TELEVISION PROGRAMS
CA259,215A CA1033051A (en) 1973-06-08 1976-08-16 Receiver-secondary transmitter for t.v. programmes broadcasting from a primary transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7321025A FR2232894A1 (en) 1973-06-08 1973-06-08 Transmission of one or more televisgn programmes - employs double modulation of video signals and single stage detection

Publications (2)

Publication Number Publication Date
FR2232894A1 true FR2232894A1 (en) 1975-01-03
FR2232894B1 FR2232894B1 (en) 1980-06-20

Family

ID=9120725

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7321025A Granted FR2232894A1 (en) 1973-06-08 1973-06-08 Transmission of one or more televisgn programmes - employs double modulation of video signals and single stage detection

Country Status (5)

Country Link
AR (2) AR207449A1 (en)
BR (1) BR7404763D0 (en)
CA (1) CA1033448A (en)
FR (1) FR2232894A1 (en)
IN (1) IN142139B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019746A1 (en) * 1979-05-16 1980-12-10 Siemens Aktiengesellschaft Directional radio relay system for large communal antenna systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019746A1 (en) * 1979-05-16 1980-12-10 Siemens Aktiengesellschaft Directional radio relay system for large communal antenna systems

Also Published As

Publication number Publication date
AR207449A1 (en) 1976-10-08
AR207357A1 (en) 1976-09-30
BR7404763D0 (en) 1975-01-21
FR2232894B1 (en) 1980-06-20
IN142139B (en) 1977-06-04
CA1033448A (en) 1978-06-20

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Legal Events

Date Code Title Description
ST Notification of lapse