JPS5784628A - Mobile radio device - Google Patents
Mobile radio deviceInfo
- 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
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.
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)
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 |
-
1980
- 1980-11-17 JP JP16173280A patent/JPS5784628A/en active Pending
Cited By (4)
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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