FR2189949B2 - - Google Patents

Info

Publication number
FR2189949B2
FR2189949B2 FR7222690A FR7222690A FR2189949B2 FR 2189949 B2 FR2189949 B2 FR 2189949B2 FR 7222690 A FR7222690 A FR 7222690A FR 7222690 A FR7222690 A FR 7222690A FR 2189949 B2 FR2189949 B2 FR 2189949B2
Authority
FR
France
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
FR7222690A
Other languages
French (fr)
Other versions
FR2189949A2 (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.)
Compagnie IBM France SAS
Original Assignee
Compagnie IBM France SAS
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 Compagnie IBM France SAS filed Critical Compagnie IBM France SAS
Priority to FR7222690A priority Critical patent/FR2189949B2/fr
Publication of FR2189949A2 publication Critical patent/FR2189949A2/fr
Application granted granted Critical
Publication of FR2189949B2 publication Critical patent/FR2189949B2/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/342—Muting when some special characteristic of the signal is sensed which distinguishes it from noise, e.g. using speech detector
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/292—Extracting wanted echo-signals
    • G01S7/2921—Extracting wanted echo-signals based on data belonging to one radar period
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/292—Extracting wanted echo-signals
    • G01S7/2921—Extracting wanted echo-signals based on data belonging to one radar period
    • G01S7/2922—Extracting wanted echo-signals based on data belonging to one radar period by using a controlled threshold
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/341—Muting when no signals or only weak signals are present
FR7222690A 1968-12-20 1972-06-20 Expired FR2189949B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7222690A FR2189949B2 (en) 1968-12-20 1972-06-20

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR6009642 1968-12-20
FR7222690A FR2189949B2 (en) 1968-12-20 1972-06-20

Publications (2)

Publication Number Publication Date
FR2189949A2 FR2189949A2 (en) 1974-01-25
FR2189949B2 true FR2189949B2 (en) 1975-03-07

Family

ID=26214730

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7222690A Expired FR2189949B2 (en) 1968-12-20 1972-06-20

Country Status (1)

Country Link
FR (1) FR2189949B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE397409B (en) * 1975-02-10 1977-10-31 Bofors Ab IN RECEIVING EQUIPMENT FOR SIGNAL CIRCUIT SIGNALS

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783466A (en) * 1949-09-15 1957-02-26 Gen Electric Radar receiver automatic noise leveling circuits
GB1114531A (en) * 1964-02-12 1968-05-22 Emi Ltd Improvements relating to radar
FR1584091A (en) * 1968-08-02 1969-12-12

Also Published As

Publication number Publication date
FR2189949A2 (en) 1974-01-25

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