JP2005079870A - Am受信回路 - Google Patents
Am受信回路 Download PDFInfo
- Publication number
- JP2005079870A JP2005079870A JP2003307426A JP2003307426A JP2005079870A JP 2005079870 A JP2005079870 A JP 2005079870A JP 2003307426 A JP2003307426 A JP 2003307426A JP 2003307426 A JP2003307426 A JP 2003307426A JP 2005079870 A JP2005079870 A JP 2005079870A
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- signal
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- sound quality
- intermediate frequency
- electric field
- Prior art date
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- 238000012937 correction Methods 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 230000005684 electric field Effects 0.000 abstract description 69
- 230000005236 sound signal Effects 0.000 abstract description 17
- 239000000284 extract Substances 0.000 abstract description 4
- 230000003321 amplification Effects 0.000 description 15
- 238000003199 nucleic acid amplification method Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000005577 local transmission Effects 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000005433 ionosphere Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Images
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
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
-
- 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
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
-
- 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
- H04B1/16—Circuits
-
- 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
- H04B1/16—Circuits
- H04B1/1646—Circuits adapted for the reception of stereophonic signals
- H04B1/1661—Reduction of noise by manipulation of the baseband composite stereophonic signal or the decoded left and right channels
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Noise Elimination (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Superheterodyne Receivers (AREA)
Abstract
【解決手段】IF部16は、所望の放送波の搬送周波数を、所定の中間周波数に変換し、増幅器によって増幅して出力する。IF−AGC回路18は、中間周波信号出力の一部を取り出し、IF部16の増幅器の利得を制御する。IF信号部16の出力信号は、AM検波部20に入力され、搬送波成分を取り除き、もとの変調信号である音声信号を得る。AM検波部20から出力された音声信号は音質補正部22に入力され、音声信号の周波数特性を変化させて、音質を補正する。IF強度検出部30は、IF部16から出力されたIF信号の搬送波周波数成分をBPF34で抽出し、そのIF信号搬送波の強度を積分器36で直流電圧信号に変換する。音質補正部22は、受信電界強度が弱い場合、IF信号搬送波強度信号に基づいて音質の補正を行う。
【選択図】図4
Description
Claims (2)
- 受信放送波から生成された中間周波数信号を増幅し、出力する中間周波数信号部と、
前記中間周波数信号出力からAM変調信号を検波し、出力するAM検波部と、
前記AM検波部の出力信号の音質を補正する音質補正部と、
を備えたAM受信回路であって、
前記中間周波数信号出力から搬送波周波数成分を抽出するバンドパスフィルタと、
前記バンドパスフィルタからの出力を積分し、前記中間周波数信号の搬送波の強度を直流電圧に変換し、出力する積分器と、
を有し、
前記積分器から出力された直流電圧に応じて前記音質の補正を行うことを特徴とするAM受信回路。 - アンテナから入力された受信放送波信号を増幅して出力するフロントエンド部と、
前記受信放送波信号出力から中間周波数信号を生成し、増幅して出力する中間周波数信号部と、
前記中間周波数信号出力からAM変調信号を検波し、出力するAM検波部と、
前記AM検波部の出力信号の音質を補正する音質補正部と、
前記中間周波数信号出力から搬送波成分を抽出するバンドパスフィルタと、
前記バンドパスフィルタからの出力を積分し、前記中間周波数信号の搬送波の強度を直流電圧に変換し、出力する積分器と、
を備えたAM受信回路であって、
前記フロントエンド部、または、中間周波数信号部の少なくとも一方に、それぞれ前記受信放送波信号出力強度、または、中間周波数信号出力強度を制御するAGC回路が接続され、
前記音質補正部は、前記AGC回路が出力するシグナルメータ信号の強度に応じて音質の補正を行い、前記シグナルメータ信号が所定の強度より小さいとき、前記積分器が出力する前記積分器から出力された直流電圧に応じて音質の補正を行うことを特徴とするAM受信回路。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003307426A JP4349865B2 (ja) | 2003-08-29 | 2003-08-29 | Am受信回路 |
CNB2004100576258A CN100539447C (zh) | 2003-08-29 | 2004-08-20 | 振幅调制接收电路 |
TW093125641A TWI243547B (en) | 2003-08-29 | 2004-08-26 | AM receiving circuit |
KR1020040067908A KR100572294B1 (ko) | 2003-08-29 | 2004-08-27 | Am 수신 회로 |
US10/929,622 US7171180B2 (en) | 2003-08-29 | 2004-08-30 | AM receiver circuit performing sound quality compensation of AM detection output signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003307426A JP4349865B2 (ja) | 2003-08-29 | 2003-08-29 | Am受信回路 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005079870A true JP2005079870A (ja) | 2005-03-24 |
JP4349865B2 JP4349865B2 (ja) | 2009-10-21 |
Family
ID=34269438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2003307426A Expired - Fee Related JP4349865B2 (ja) | 2003-08-29 | 2003-08-29 | Am受信回路 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7171180B2 (ja) |
JP (1) | JP4349865B2 (ja) |
KR (1) | KR100572294B1 (ja) |
CN (1) | CN100539447C (ja) |
TW (1) | TWI243547B (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005099106A1 (ja) * | 2004-03-30 | 2005-10-20 | Sanyo Electric Co., Ltd. | Am受信回路 |
WO2006059550A1 (ja) * | 2004-11-30 | 2006-06-08 | Pioneer Corporation | 受信装置および受信方法 |
JP2015023366A (ja) * | 2013-07-18 | 2015-02-02 | 日本無線株式会社 | 電力推定装置および品質評価装置 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6393061B2 (ja) * | 2014-04-04 | 2018-09-19 | アルパイン株式会社 | ラジオ放送受信装置、放送周波数検出方法、放送周波数サーチ方法及び放送周波数スキャン方法 |
CN108155913B (zh) * | 2018-01-12 | 2019-11-15 | 福建飞通通讯科技股份有限公司 | 调频信号静噪方法、装置及系统 |
JP7000945B2 (ja) * | 2018-03-23 | 2022-01-19 | 株式会社Jvcケンウッド | 無線通信機 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3197686B2 (ja) | 1993-06-29 | 2001-08-13 | 三洋電機株式会社 | Amラジオ受信機 |
US5784466A (en) * | 1997-01-16 | 1998-07-21 | Ford Motor Company | Co-channel interference detector |
JP2000013340A (ja) | 1998-06-23 | 2000-01-14 | Toshiba Ave Co Ltd | Fm受信装置 |
-
2003
- 2003-08-29 JP JP2003307426A patent/JP4349865B2/ja not_active Expired - Fee Related
-
2004
- 2004-08-20 CN CNB2004100576258A patent/CN100539447C/zh not_active Expired - Fee Related
- 2004-08-26 TW TW093125641A patent/TWI243547B/zh not_active IP Right Cessation
- 2004-08-27 KR KR1020040067908A patent/KR100572294B1/ko not_active IP Right Cessation
- 2004-08-30 US US10/929,622 patent/US7171180B2/en active Active
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005099106A1 (ja) * | 2004-03-30 | 2005-10-20 | Sanyo Electric Co., Ltd. | Am受信回路 |
US7664197B2 (en) | 2004-03-30 | 2010-02-16 | Sanyo Electric Co., Ltd. | AM receiving circuit |
WO2006059550A1 (ja) * | 2004-11-30 | 2006-06-08 | Pioneer Corporation | 受信装置および受信方法 |
JP2015023366A (ja) * | 2013-07-18 | 2015-02-02 | 日本無線株式会社 | 電力推定装置および品質評価装置 |
Also Published As
Publication number | Publication date |
---|---|
US20050059374A1 (en) | 2005-03-17 |
CN100539447C (zh) | 2009-09-09 |
JP4349865B2 (ja) | 2009-10-21 |
CN1592123A (zh) | 2005-03-09 |
TW200509558A (en) | 2005-03-01 |
TWI243547B (en) | 2005-11-11 |
US7171180B2 (en) | 2007-01-30 |
KR100572294B1 (ko) | 2006-04-24 |
KR20050021903A (ko) | 2005-03-07 |
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