JP4349866B2 - Fsk信号復調回路 - Google Patents
Fsk信号復調回路 Download PDFInfo
- Publication number
- JP4349866B2 JP4349866B2 JP2003309519A JP2003309519A JP4349866B2 JP 4349866 B2 JP4349866 B2 JP 4349866B2 JP 2003309519 A JP2003309519 A JP 2003309519A JP 2003309519 A JP2003309519 A JP 2003309519A JP 4349866 B2 JP4349866 B2 JP 4349866B2
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- JP
- Japan
- Prior art keywords
- bit
- signal
- period
- long
- threshold time
- 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.)
- Expired - Fee Related
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4902—Pulse width modulation; Pulse position modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
- H04L27/156—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
Claims (3)
- ビット期間の長い長ビットおよびビット期間の短い短ビットからなるFSK信号を復調する復調回路であって、
各ビットのビット境界タイミングを検出するビット境界検出部と、
閾値設定用指示信号に応じて、閾値時間を可変設定する閾値時間制御部と、
各ビットについて、始端のビット境界タイミングから終端のビット境界タイミングまでの間に、前記閾値時間が経過したときには長ビットであると判定し、当該閾値時間が経過しなかったときには短ビットであると判定するビット判定部と、を備え、
前記ビット判定部は、
ビット期間内で前記閾値時間が経過した時点から終端のビット境界タイミングまで有効となる超過期間信号を生成する超過期間信号生成部を含み、各ビットに対応する前記超過期間信号の有無によって長ビット/短ビットの判定を行うことを特徴とするFSK信号復調回路。 - 前記ビット判定部は、
前記超過期間信号の後端を遅らせたシフト信号を生成するシフト信号生成部を含み、各ビットについて終端のビット境界タイミングでの前記シフト信号の有無によって長ビット/短ビットの判定を行うことを特徴とする請求項1に記載のFSK信号復調回路。 - 前記FSK信号は車載システムに対する制御信号であることを特徴とする請求項2に記載のFSK信号復調回路。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003309519A JP4349866B2 (ja) | 2003-09-02 | 2003-09-02 | Fsk信号復調回路 |
CNA2004100644109A CN1592287A (zh) | 2003-09-02 | 2004-08-24 | Fsk信号解调电路 |
TW093126442A TWI265701B (en) | 2003-09-02 | 2004-09-01 | FSK signal demodulator circuit |
KR1020040069790A KR100709650B1 (ko) | 2003-09-02 | 2004-09-02 | 복조 회로 |
US10/933,129 US7369629B2 (en) | 2003-09-02 | 2004-09-02 | FSK signal demodulation circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003309519A JP4349866B2 (ja) | 2003-09-02 | 2003-09-02 | Fsk信号復調回路 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005080035A JP2005080035A (ja) | 2005-03-24 |
JP4349866B2 true JP4349866B2 (ja) | 2009-10-21 |
Family
ID=34411634
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2003309519A Expired - Fee Related JP4349866B2 (ja) | 2003-09-02 | 2003-09-02 | Fsk信号復調回路 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7369629B2 (ja) |
JP (1) | JP4349866B2 (ja) |
KR (1) | KR100709650B1 (ja) |
CN (1) | CN1592287A (ja) |
TW (1) | TWI265701B (ja) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7551669B2 (en) * | 2005-04-01 | 2009-06-23 | Harman International Industries, Incorporated | System for multiplexing independent signals |
US8427300B2 (en) * | 2009-02-20 | 2013-04-23 | Redwood Systems, Inc. | Transmission of power and data with frequency modulation |
US8248230B2 (en) * | 2009-02-20 | 2012-08-21 | Redwood Systems, Inc. | Smart power device |
US8207635B2 (en) * | 2009-02-20 | 2012-06-26 | Redwood Systems, Inc. | Digital switch communication |
US8058750B2 (en) * | 2009-05-14 | 2011-11-15 | Redwood Systems, Inc. | Discharge cycle communication |
KR101676816B1 (ko) | 2010-02-11 | 2016-11-18 | 삼성전자주식회사 | 플래시 메모리 장치 및 그것의 프로그램 방법 |
US20150348633A1 (en) * | 2010-02-11 | 2015-12-03 | Samsung Electronics Co., Ltd. | Nonvolatile memory devices and methods of programming nonvolatile memory devices |
EP2363862B1 (en) * | 2010-03-02 | 2016-10-26 | Crocus Technology | MRAM-based memory device with rotated gate |
TWI583187B (zh) | 2013-07-30 | 2017-05-11 | 聯詠科技股份有限公司 | 資料處理方法及裝置 |
CN104347101B (zh) * | 2013-08-08 | 2017-10-27 | 联咏科技股份有限公司 | 数据处理方法及装置 |
CN104702551B (zh) * | 2013-12-05 | 2018-04-27 | 上海华虹集成电路有限责任公司 | Iso/iec14443-bpsk副载波位同步期边界锁定电路 |
CN104158779B (zh) * | 2014-08-21 | 2018-05-08 | 常州工学院 | 一种基于脉宽等长机制的fsk调制方法 |
CN112019166B (zh) * | 2020-09-04 | 2023-06-27 | 北京中科芯蕊科技有限公司 | 一种亚阈值单周期时钟降频控制电路 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4013965A (en) * | 1974-08-05 | 1977-03-22 | Scharfe Jr James A | Circuit for preventing errors in decoding information from distorted pulses |
US3979685A (en) * | 1974-09-16 | 1976-09-07 | Hycom Incorporated | Frequency shift key demodulator |
US4485347A (en) * | 1980-09-04 | 1984-11-27 | Mitsubishi Denki Kabushiki Kaisha | Digital FSK demodulator |
US4499425A (en) * | 1982-08-04 | 1985-02-12 | Honeywell Inc. | Phase velocity sign detector for frequency shift key demodulation |
JP3146673B2 (ja) * | 1992-09-17 | 2001-03-19 | 日本電気株式会社 | Fsk受信機 |
KR960003027A (ko) * | 1994-06-29 | 1996-01-26 | 정몽원 | 차량용 교류발전기의 브러쉬 홀더 |
US5483193A (en) * | 1995-03-24 | 1996-01-09 | Ford Motor Company | Circuit for demodulating FSK signals |
JP3553286B2 (ja) * | 1995-09-21 | 2004-08-11 | セイコーインスツルメンツ株式会社 | Fsk復調回路 |
US5684837A (en) * | 1996-03-06 | 1997-11-04 | United Microelectronics Corporation | Adjustable digital FSK demodulator |
JPH09294143A (ja) | 1996-04-25 | 1997-11-11 | Sharp Corp | Fsk受信装置 |
JPH1025811A (ja) * | 1996-07-12 | 1998-01-27 | Sekisui House Ltd | 横架材の接合構造とその補強金物 |
US6933776B2 (en) * | 2003-03-18 | 2005-08-23 | Terax Communication Technologies Inc. | Signal demodulating method of a two-phase frequency shift keying (FSK) digital demodulator |
-
2003
- 2003-09-02 JP JP2003309519A patent/JP4349866B2/ja not_active Expired - Fee Related
-
2004
- 2004-08-24 CN CNA2004100644109A patent/CN1592287A/zh active Pending
- 2004-09-01 TW TW093126442A patent/TWI265701B/zh not_active IP Right Cessation
- 2004-09-02 US US10/933,129 patent/US7369629B2/en not_active Expired - Fee Related
- 2004-09-02 KR KR1020040069790A patent/KR100709650B1/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR100709650B1 (ko) | 2007-04-20 |
TW200511787A (en) | 2005-03-16 |
JP2005080035A (ja) | 2005-03-24 |
CN1592287A (zh) | 2005-03-09 |
US20050084041A1 (en) | 2005-04-21 |
US7369629B2 (en) | 2008-05-06 |
TWI265701B (en) | 2006-11-01 |
KR20050024249A (ko) | 2005-03-10 |
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