JPS57168530A - Noise suppressing system - Google Patents

Noise suppressing system

Info

Publication number
JPS57168530A
JPS57168530A JP5314681A JP5314681A JPS57168530A JP S57168530 A JPS57168530 A JP S57168530A JP 5314681 A JP5314681 A JP 5314681A JP 5314681 A JP5314681 A JP 5314681A JP S57168530 A JPS57168530 A JP S57168530A
Authority
JP
Japan
Prior art keywords
signal
intermediate frequency
frequency band
false
supplied
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.)
Pending
Application number
JP5314681A
Other languages
Japanese (ja)
Inventor
Masahiro Sato
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP5314681A priority Critical patent/JPS57168530A/en
Publication of JPS57168530A publication Critical patent/JPS57168530A/en
Pending legal-status Critical Current

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To suppress the noise caused in the no-signal time in any state with simple constitution and in a quick and accurate way, by always transmitting the false signal at the outside of an intermediate frequency band to an intermediate frequency amplifier to control an amplitude limiter. CONSTITUTION:The false signal at the outside of an intermediate frequency band which is transmitted from an intermediate frequency band signal generator 9 is transmitted at all times to an intermediate frequency amplifier 2 via an attenuator 8. When a desired intermediate frequency signal is not supplied, the gain of an amplitude limiter is controlled by the false signal to transmit no noise in the no-signal time. When a desired intermediate frequency signal is supplied, the desired signal that is selected and amplified through an intermediate frequency band pass filter 1 and the amplifier 2 is supplied to the limiter 3 along with the above-mentioned false signal. Then the modulated signal of a desired wave is delivered thruogh a frequency discriminator 4 when the level of the desired intermediate frequency signal exceeds the level of the false signal.
JP5314681A 1981-04-10 1981-04-10 Noise suppressing system Pending JPS57168530A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5314681A JPS57168530A (en) 1981-04-10 1981-04-10 Noise suppressing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5314681A JPS57168530A (en) 1981-04-10 1981-04-10 Noise suppressing system

Publications (1)

Publication Number Publication Date
JPS57168530A true JPS57168530A (en) 1982-10-16

Family

ID=12934682

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5314681A Pending JPS57168530A (en) 1981-04-10 1981-04-10 Noise suppressing system

Country Status (1)

Country Link
JP (1) JPS57168530A (en)

Similar Documents

Publication Publication Date Title
ATE79495T1 (en) FM RECEIVER WITH NOISE REDUCTION WHEN RECEIVING SIGNALS WITH ''RALEIGH'' FADER.
GB1092586A (en) Improvements in or relating to radio transmitters
GB1350535A (en) Device for neutralizing fire-control radar
JPS57168530A (en) Noise suppressing system
JPS55133148A (en) Interference wave removal system
FR2447650A1 (en) TRANSCEIVER WITH AUTOMATIC ALTERNATE CONTROL AND TELECOMMUNICATIONS NETWORK INCLUDING SUCH A TRANSCEIVER
EP0052415A3 (en) Frequency characteristic adjusting apparatus
US4286116A (en) Device for the processing of voice signals
FR2416190A1 (en) Transport trolley control system - has transmitter and a receiver on each trolley with signal amplitude detector including three variable gain amplifier stages
GB8824968D0 (en) Radio frequency transmission and reception system
JPS5564447A (en) Digital signal transmission system
JPS5468102A (en) Sound reinforcement system
JPS5421214A (en) Automatic clarifier adjusting system of ssb
JPS575442A (en) Fm receiver
JPS5647132A (en) Broad-band receiving circuit
JPS57140042A (en) Transmitting power controller in satellite communication
JPS55128928A (en) Radio communication system
JPS5737280A (en) Automatic gain control circuit of radar receiver
JPS5552619A (en) Limiter circuit for fm receiver
JPS573409A (en) Agc circuit
JPS5451559A (en) Mimic target
JPS5469005A (en) Automatic gain adjusting circuit
JPS55120231A (en) Trunk system
JPS57115033A (en) Data transmission and reception device
JPS55150646A (en) Radio data transmission system