JPS5654130A - Suppression circuit for band limit noise - Google Patents

Suppression circuit for band limit noise

Info

Publication number
JPS5654130A
JPS5654130A JP13013579A JP13013579A JPS5654130A JP S5654130 A JPS5654130 A JP S5654130A JP 13013579 A JP13013579 A JP 13013579A JP 13013579 A JP13013579 A JP 13013579A JP S5654130 A JPS5654130 A JP S5654130A
Authority
JP
Japan
Prior art keywords
circuit
band
band limit
fed
signal
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
JP13013579A
Other languages
Japanese (ja)
Inventor
Masayoshi Kumagai
Hiroshi Harada
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP13013579A priority Critical patent/JPS5654130A/en
Publication of JPS5654130A publication Critical patent/JPS5654130A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/18—Automatic control in untuned amplifiers

Landscapes

  • Noise Elimination (AREA)

Abstract

PURPOSE:To increase the appearent SN, by assuring the communication without the break of communication at the mobile communication having frequent reception level, through the regulation of noise signal and the band limit by demodulation signal according to the reception level. CONSTITUTION:Incoming electromagnetic waves are amplified at a high frequency amplifying circuit 2, are fed to a mixing circuit of the next stage, where they are converted into intermediate frequency and amplified at an intermediate frequency amplifying circuit 5. The output of the intermediate frequency amplifying circuit 5 is fed to a frequency discrimination circuit 6 and level detection is made at a level detection circuit 7 of a band limit noise suppression circuit 10. Further, a control signal is produced from a band control signal generating circuit 8 only when the level detected is small. The band width of a variable band limit circuit 9 is determined with this band control signal and noise signals are suppressed through the band limit of the sound signal demodulated at the frequency discriminating circuit 6 and the audio signal is fed to a low frequency amplifying circuit 11 and output from a speaker as the sound signal suppressing noise signals.
JP13013579A 1979-10-09 1979-10-09 Suppression circuit for band limit noise Pending JPS5654130A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13013579A JPS5654130A (en) 1979-10-09 1979-10-09 Suppression circuit for band limit noise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13013579A JPS5654130A (en) 1979-10-09 1979-10-09 Suppression circuit for band limit noise

Publications (1)

Publication Number Publication Date
JPS5654130A true JPS5654130A (en) 1981-05-14

Family

ID=15026786

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13013579A Pending JPS5654130A (en) 1979-10-09 1979-10-09 Suppression circuit for band limit noise

Country Status (1)

Country Link
JP (1) JPS5654130A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58183053A (en) * 1982-04-20 1983-10-26 Mitsubishi Gas Chem Co Inc Preservation of fresh noodle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58183053A (en) * 1982-04-20 1983-10-26 Mitsubishi Gas Chem Co Inc Preservation of fresh noodle

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