BR8101254A - Instalacao para o desligamento de receptores no caso de pequena relacao sinal-ruido, para um sistema de radio com modulacao digital - Google Patents

Instalacao para o desligamento de receptores no caso de pequena relacao sinal-ruido, para um sistema de radio com modulacao digital

Info

Publication number
BR8101254A
BR8101254A BR8101254A BR8101254A BR8101254A BR 8101254 A BR8101254 A BR 8101254A BR 8101254 A BR8101254 A BR 8101254A BR 8101254 A BR8101254 A BR 8101254A BR 8101254 A BR8101254 A BR 8101254A
Authority
BR
Brazil
Prior art keywords
disconnecting
receivers
installation
case
radio system
Prior art date
Application number
BR8101254A
Other languages
English (en)
Inventor
F Muller
Original Assignee
Siemens Ag
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 Siemens Ag filed Critical Siemens Ag
Publication of BR8101254A publication Critical patent/BR8101254A/pt

Links

Classifications

    • 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
    • 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
    • H03G3/34—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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
    • H04L27/148—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using filters, including PLL-type filters

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Noise Elimination (AREA)
BR8101254A 1980-03-03 1981-02-27 Instalacao para o desligamento de receptores no caso de pequena relacao sinal-ruido, para um sistema de radio com modulacao digital BR8101254A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3008076A DE3008076C2 (de) 1980-03-03 1980-03-03 Einrichtung zur Empfängerabschaltung bei kleinem Signal-Geräusch-Abstand für ein digital moduliertes Funksystem mit Frequenzmodulation

Publications (1)

Publication Number Publication Date
BR8101254A true BR8101254A (pt) 1981-09-08

Family

ID=6096116

Family Applications (1)

Application Number Title Priority Date Filing Date
BR8101254A BR8101254A (pt) 1980-03-03 1981-02-27 Instalacao para o desligamento de receptores no caso de pequena relacao sinal-ruido, para um sistema de radio com modulacao digital

Country Status (9)

Country Link
US (1) US4355407A (pt)
EP (1) EP0035257A1 (pt)
AR (1) AR225073A1 (pt)
AU (1) AU539504B2 (pt)
BR (1) BR8101254A (pt)
CA (1) CA1173110A (pt)
DE (1) DE3008076C2 (pt)
MX (1) MX149675A (pt)
ZA (1) ZA811350B (pt)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2109201B (en) * 1981-10-26 1985-03-27 Philips Electronic Associated Direct modulation fm receiver
FR2538645B1 (fr) * 1982-12-28 1986-04-11 Thomson Csf Procede et dispositif d'interpolation de la parole dans un systeme de transmission de parole numerisee
US4597107A (en) * 1983-04-01 1986-06-24 Psr Products, Inc. Modulation detector and classifier
JPS6154743A (ja) * 1984-08-25 1986-03-19 Nec Corp 送信制御方式
GB2170373B (en) * 1984-12-28 1989-03-15 Canon Kk Image processing apparatus
EP0298959B1 (en) * 1986-04-03 1992-08-12 Motorola, Inc. Fm receiver with noise suppression during rayleigh faded received signals
US4768203A (en) * 1987-09-18 1988-08-30 Bell Communications Research, Inc. Signal-to-noise ratio testing in adaptive differential pulse code modulation
WO1993015559A1 (en) * 1992-02-03 1993-08-05 Motorola, Inc. Bit error rate controlled squelch
US5745523A (en) * 1992-10-27 1998-04-28 Ericsson Inc. Multi-mode signal processing
GB2303033B (en) * 1995-07-03 1999-09-01 Hi Key Ltd A frequency shift keyed signals receiver integrated circuit chip

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155909A (en) * 1961-10-31 1964-11-03 Gen Electric Mobile communication system in which the base station receiver, which receives the strongest signal, is automatically selected
DE1252282B (pt) * 1964-03-12
GB1237517A (en) * 1970-02-05 1971-06-30 Pye Ltd Muting arrangement for a communication system
US3766479A (en) * 1971-10-04 1973-10-16 Ncr Carrier detection circuit
US3934206A (en) * 1974-09-26 1976-01-20 Rockwell International Corporation Receiver with adjustable squelch
US3947769A (en) * 1974-10-23 1976-03-30 Hoffman Electronics Corporation Threshold correction system in FSK transmissions
US3979679A (en) * 1975-06-30 1976-09-07 California Microwave, Inc. FM demodulator having squelch circuit using bucket brigade delay line
DE2644206C2 (de) * 1976-09-30 1982-04-29 Siemens AG, 1000 Berlin und 8000 München Funksystem
US4125809A (en) * 1977-11-09 1978-11-14 The United States Of America As Represented By The Secretary Of The Navy Digital C/kT meter

Also Published As

Publication number Publication date
EP0035257A1 (de) 1981-09-09
CA1173110A (en) 1984-08-21
AR225073A1 (es) 1982-02-15
US4355407A (en) 1982-10-19
MX149675A (es) 1983-12-09
ZA811350B (en) 1982-03-31
DE3008076A1 (de) 1981-09-10
AU539504B2 (en) 1984-10-04
AU6796581A (en) 1981-09-10
DE3008076C2 (de) 1982-05-06

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