JPS5784628A - Mobile radio device - Google Patents

Mobile radio device

Info

Publication number
JPS5784628A
JPS5784628A JP16173280A JP16173280A JPS5784628A JP S5784628 A JPS5784628 A JP S5784628A JP 16173280 A JP16173280 A JP 16173280A JP 16173280 A JP16173280 A JP 16173280A JP S5784628 A JPS5784628 A JP S5784628A
Authority
JP
Japan
Prior art keywords
noise
filter
band
output
frequency band
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
JP16173280A
Other languages
Japanese (ja)
Inventor
Takahiro Yokota
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16173280A priority Critical patent/JPS5784628A/en
Publication of JPS5784628A publication Critical patent/JPS5784628A/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
    • H03G5/24—Automatic control in frequency-selective amplifiers

Landscapes

  • Noise Elimination (AREA)

Abstract

PURPOSE:To keep the articulation of voice, by detecting the noise of base band in a mobile radio, keeping the frequency band of a filter normal when S/N is high in a short distance and narrowing the frequency band when S/N is low in a long distance. CONSTITUTION:A radio signal inputted to an antenna input 1 is inputted to a detector 8 via an amplifier 2, a mixer 3, a band pass filter 5, an AMP6 and a limiter 7, the detected output is amplified at an AMP 12 via a filter 11 and outputted from a speaker 13. Noise is detected from a part of the detected output for 10-30kHz band at a noise detection circuit 10, and if the noise is at a stationary level, the output is zero, the filter 11 is operated at normal 0.3- 3.1kHz band, and if noise if increased, the frequency band of the filter 11 is switched to 0.3-2kHz with the output of the detection circuit 10 to keep the articulation of voice.
JP16173280A 1980-11-17 1980-11-17 Mobile radio device Pending JPS5784628A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16173280A JPS5784628A (en) 1980-11-17 1980-11-17 Mobile radio device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16173280A JPS5784628A (en) 1980-11-17 1980-11-17 Mobile radio device

Publications (1)

Publication Number Publication Date
JPS5784628A true JPS5784628A (en) 1982-05-27

Family

ID=15740824

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16173280A Pending JPS5784628A (en) 1980-11-17 1980-11-17 Mobile radio device

Country Status (1)

Country Link
JP (1) JPS5784628A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0242444A2 (en) * 1986-04-17 1987-10-28 Robert Bosch Gmbh Mobile radio receiver
JPS63111036U (en) * 1987-01-08 1988-07-16
JPH01169835U (en) * 1988-05-18 1989-11-30
US6032032A (en) * 1996-03-25 2000-02-29 Matsushita Electric Industrial Co., Ltd. Mobile radio communication apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0242444A2 (en) * 1986-04-17 1987-10-28 Robert Bosch Gmbh Mobile radio receiver
JPS63111036U (en) * 1987-01-08 1988-07-16
JPH01169835U (en) * 1988-05-18 1989-11-30
US6032032A (en) * 1996-03-25 2000-02-29 Matsushita Electric Industrial Co., Ltd. Mobile radio communication apparatus

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