HK16788A - Circuit for interference rejection - Google Patents

Circuit for interference rejection

Info

Publication number
HK16788A
HK16788A HK167/88A HK16788A HK16788A HK 16788 A HK16788 A HK 16788A HK 167/88 A HK167/88 A HK 167/88A HK 16788 A HK16788 A HK 16788A HK 16788 A HK16788 A HK 16788A
Authority
HK
Hong Kong
Prior art keywords
time constant
signal
useful
members
constant member
Prior art date
Application number
HK167/88A
Inventor
Guenter Gleim
Original Assignee
Saba Gmbh
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 Saba Gmbh filed Critical Saba Gmbh
Publication of HK16788A publication Critical patent/HK16788A/en

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
    • H03G3/3084—Automatic control in amplifiers having semiconductor devices in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/008—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general of digital or coded signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/04—Limiting level dependent on strength of signal; Limiting level dependent on strength of carrier on which signal is modulated
    • 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
    • H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking
    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference

Abstract

1. Circuit arrangement for the suppression of noise pulses in the transmission of digital signals of differing time intervals and differeing amplitudes with a first constant member and a second time constant member connected in series with the first, whereby the time constant members are arranged in the useful signal path, characterized in that the two time constant members (R1, C1; R2, C2) possess considerably differing time constant values and in that a voltage limiting means (Z) is connected in parallel to the first time constant member (R1, C1) with the smaller time constant value, whereby the applied signal (N) is divided at the time constant members (C1, R1; C2, R2) connected in series in such a way, that the signal applied to the first time constant member (R1, C1) is used to control the following switching stage (V2) and that the signal applied to the second time constant member (R2, C2) supplies a signal to noise ratio depending on the amplitude of the useful signal, whereby the voltage portion of the useful signal (N) at the first time constant member (R1, C1) with the smaller time constant is limited to the value predetermined by the voltage limiting means (Z), and that the first time constant member (R1, C1) is dimensioned such, that the voltage applied thereto is reduced before arrival of the next useful pulse, (N) to such a value, that the useful pulse, (N) causes the following amplifier stage (V2), which works as a switch, to be switched positively to the conducting state.
HK167/88A 1982-02-18 1988-03-03 Circuit for interference rejection HK16788A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82101222A EP0086853B1 (en) 1982-02-18 1982-02-18 Circuit for interference rejection

Publications (1)

Publication Number Publication Date
HK16788A true HK16788A (en) 1988-03-11

Family

ID=8188883

Family Applications (1)

Application Number Title Priority Date Filing Date
HK167/88A HK16788A (en) 1982-02-18 1988-03-03 Circuit for interference rejection

Country Status (4)

Country Link
EP (1) EP0086853B1 (en)
AT (1) ATE17425T1 (en)
HK (1) HK16788A (en)
SG (1) SG74187G (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT348590B (en) * 1975-09-26 1979-02-26 Grundig Emv CIRCUIT ARRANGEMENT TO DISCONNECT THE INFLUENCE OF SHORT INTERFERENCE PULSES WITH AUTOMATIC LEVEL CONTROL
DE2618532C3 (en) * 1976-04-28 1980-01-17 Neumann Elektronik Gmbh, 4330 Muelheim Arrangement for the suppression of periodically occurring disturbances in telecommunication systems
DE2943913A1 (en) * 1979-10-31 1981-05-14 Sennheiser Electronic Kg, 3002 Wedemark Receiver for pulsed light signals of data transmission system - has opto-electronic converter feeding amplitude filter with threshold regulation

Also Published As

Publication number Publication date
EP0086853A1 (en) 1983-08-31
SG74187G (en) 1988-09-16
ATE17425T1 (en) 1986-01-15
EP0086853B1 (en) 1986-01-08

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Legal Events

Date Code Title Description
PE Patent expired