WO2000079713A3 - Digital broadcast transmission system comprising a power control system using a pilot signal - Google Patents

Digital broadcast transmission system comprising a power control system using a pilot signal Download PDF

Info

Publication number
WO2000079713A3
WO2000079713A3 PCT/US2000/017254 US0017254W WO0079713A3 WO 2000079713 A3 WO2000079713 A3 WO 2000079713A3 US 0017254 W US0017254 W US 0017254W WO 0079713 A3 WO0079713 A3 WO 0079713A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
pilot
broadcast transmission
information
gain
Prior art date
Application number
PCT/US2000/017254
Other languages
French (fr)
Other versions
WO2000079713A2 (en
Inventor
Edwin Plonka
Edwin Twitchell
Original Assignee
Harris Corp
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 Harris Corp filed Critical Harris Corp
Priority to CA002374255A priority Critical patent/CA2374255A1/en
Priority to AU56336/00A priority patent/AU5633600A/en
Publication of WO2000079713A2 publication Critical patent/WO2000079713A2/en
Publication of WO2000079713A3 publication Critical patent/WO2000079713A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/005—Control by a pilot signal

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Transmitters (AREA)

Abstract

A high definition television broadcast transmission system includes a feature of maintaining a constant transmission output power. A system includes components, such as a digital encoder (12), for providing an information signal. A pilot source (30) provides a pilot signal. A combiner (26) combines the information and pilot signals. A power amplifier (50) amplifies the combined information and pilot signals to a broadcast transmission power level. An automatic gain control (38), located upstream of the amplifier (50), increases gain of the information signal in response to a control signal. The broadcast transmission power level of the information signal is dependent upon the gain applied by the gain control. A sample signal contains the combined information and pilot signals, is derived from an output of the power amplifier (50). A pilot-indicative signal is isolated from the sample signal. The control signal for the gain control (38) is determined using the pilot-indicative signal.
PCT/US2000/017254 1999-06-22 2000-06-22 Digital broadcast transmission system comprising a power control system using a pilot signal WO2000079713A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002374255A CA2374255A1 (en) 1999-06-22 2000-06-22 Digital broadcast transmission system comprising a power control system using a pilot signal
AU56336/00A AU5633600A (en) 1999-06-22 2000-06-22 Power control via use of a pilot signal within a digital broadcast transmission system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US33834599A 1999-06-22 1999-06-22
US09/338,345 1999-06-22

Publications (2)

Publication Number Publication Date
WO2000079713A2 WO2000079713A2 (en) 2000-12-28
WO2000079713A3 true WO2000079713A3 (en) 2001-06-14

Family

ID=23324447

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/017254 WO2000079713A2 (en) 1999-06-22 2000-06-22 Digital broadcast transmission system comprising a power control system using a pilot signal

Country Status (3)

Country Link
AU (1) AU5633600A (en)
CA (1) CA2374255A1 (en)
WO (1) WO2000079713A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018105040A1 (en) 2017-07-31 2019-01-31 Schaeffler Technologies AG & Co. KG fluid arrangement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2532802A1 (en) * 1982-09-07 1984-03-09 Lignes Telegraph Telephon Information transmission system comprising a device for regulating the levels of information.
GB2238435A (en) * 1989-11-06 1991-05-29 Mitsubishi Electric Corp Controlling gain of modulated transmissions

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2532802A1 (en) * 1982-09-07 1984-03-09 Lignes Telegraph Telephon Information transmission system comprising a device for regulating the levels of information.
GB2238435A (en) * 1989-11-06 1991-05-29 Mitsubishi Electric Corp Controlling gain of modulated transmissions

Also Published As

Publication number Publication date
WO2000079713A2 (en) 2000-12-28
AU5633600A (en) 2001-01-09
CA2374255A1 (en) 2000-12-28

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