JP2007251994A - 無線周波信号受信機 - Google Patents
無線周波信号受信機 Download PDFInfo
- Publication number
- JP2007251994A JP2007251994A JP2007130235A JP2007130235A JP2007251994A JP 2007251994 A JP2007251994 A JP 2007251994A JP 2007130235 A JP2007130235 A JP 2007130235A JP 2007130235 A JP2007130235 A JP 2007130235A JP 2007251994 A JP2007251994 A JP 2007251994A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- microcontroller
- output signal
- carrier
- 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
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 230000005236 sound signal Effects 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000001228 spectrum Methods 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
- 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
- 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
- H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
- H03G3/342—Muting when some special characteristic of the signal is sensed which distinguishes it from noise, e.g. using speech detector
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mobile Radio Communication Systems (AREA)
- Noise Elimination (AREA)
Abstract
本発明により、必要とされる部品点数が少なく、信頼性が改善され、組み立ておよび試験が簡単になり、製造コストが低減された無線周波数信号受信機を提供する。
【解決手段】
送受切換器105′からの信号は、データ・スライサ111′を含む受信回路110′に供給される。マイクロコントローラ160′は、データ・スライサ111′からライン115′を介して供給されるベースバンド音声信号を周期的にサンプリングして、その周波数成分を調べる。マイクロコントローラ160′は、少なくとも1つの所定の周波数閾値を使用して、出力信号がこの周波数閾値よりも周波数の高い信号を含んでいれば、RF信号が存在していないと判定する。マイクロコントローラ160′は、2重トーン多周波トーンを発生するために118μ秒ごとに中断される。118μ秒の間隔でサンプリングすることにより、音声周波数が約8.5KHzまで識別される。
【選択図】 図2
Description
105 送受切換器
106 アンテナ
110 受信回路
111′ データ・スライサ
120 コンパンダ
130 音声増幅器
140 電話線インタフェース
150 搬送波検出回路
155 調節装置
160 マイクロコントローラ
165 PLL(位相固定ループ)回路
170 キーパッド
175 送信回路
Claims (1)
- 無線周波数信号受信機において、
不在期間のある無線周波数信号を受信する入力端と、
前記無線周波数信号に応答して、前記入力端に結合されて出力信号を発生する検波回路であって、前記出力信号は、前記無線周波数信号が存在するときはベースバンド信号であり、前記無線周波数信号が存在しないときは雑音信号である、前記検波回路と、
前記ベースバンド信号を受信し利用する利用回路と、
前記無線周波数信号受信機を制御するマイクロコンピュータ回路と、
からなり、
前記マイクロコンピュータ回路は、
a)前記出力信号を受信するように結合され、前記出力信号を周期的にサンプリングして、前記出力信号の周波数成分を判定する手段と、
b)前記出力信号の前記周波数成分が所定の低周波数閾値以下である場合に無線周波数信号が存在することを示す手段と、
c)前記出力信号の前記周波数成分が所定の高周波数閾値を超えている場合に無線周波数信号が不在であることを示す手段と、
を含む、前記無線周波数信号受信機。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17135393A | 1993-12-21 | 1993-12-21 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6340627A Division JPH07202796A (ja) | 1993-12-21 | 1994-12-20 | 無線周波信号受信機 |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2007251994A true JP2007251994A (ja) | 2007-09-27 |
Family
ID=22623429
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6340627A Pending JPH07202796A (ja) | 1993-12-21 | 1994-12-20 | 無線周波信号受信機 |
JP2007130235A Pending JP2007251994A (ja) | 1993-12-21 | 2007-05-16 | 無線周波信号受信機 |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6340627A Pending JPH07202796A (ja) | 1993-12-21 | 1994-12-20 | 無線周波信号受信機 |
Country Status (8)
Country | Link |
---|---|
US (1) | US5864750A (ja) |
EP (1) | EP0660536B1 (ja) |
JP (2) | JPH07202796A (ja) |
KR (1) | KR100355855B1 (ja) |
CN (1) | CN1071983C (ja) |
DE (1) | DE69434275T2 (ja) |
MY (1) | MY114515A (ja) |
SG (1) | SG64868A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7127448B1 (en) * | 2000-04-26 | 2006-10-24 | Oracle International Corporation | Reforming queries to selectively audit accesses to rows within a relational database |
US7373554B2 (en) * | 2004-09-24 | 2008-05-13 | Oracle International Corporation | Techniques for automatic software error diagnostics and correction |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3437937A (en) * | 1966-08-08 | 1969-04-08 | Wilcox Electric Co Inc | Digital squelch system |
US3633112A (en) * | 1970-09-28 | 1972-01-04 | Collins Radio Co | Digital audio squelch |
US3902123A (en) * | 1973-11-30 | 1975-08-26 | Cincinnati Electronics Corp | Digital circuit for determining if signal source consists primarily of noise or contains information |
JPS61112435A (ja) * | 1984-11-06 | 1986-05-30 | Nec Corp | 搬送波検出回路 |
GB2212032A (en) * | 1987-10-30 | 1989-07-12 | Philips Nv | Controlled csma packet switching system |
GB2217150B (en) * | 1988-03-05 | 1992-04-01 | Racal Tacticom Systems Ltd | Frequency responsive systems & methods |
JPH02186723A (ja) * | 1988-08-25 | 1990-07-23 | Nec Corp | 受信機 |
US5031233A (en) * | 1989-07-11 | 1991-07-09 | At&E Corporation | Single chip radio receiver with one off-chip filter |
US5101509A (en) * | 1990-09-14 | 1992-03-31 | Ford Motor Company | Rf filter alignment using digital processor clock |
JPH04216226A (ja) * | 1990-12-17 | 1992-08-06 | Tokyo Electric Co Ltd | 受信信号検出装置 |
JPH04247723A (ja) * | 1991-02-01 | 1992-09-03 | Fujitsu Ten Ltd | 無線通信波検出装置 |
US5349701A (en) * | 1992-01-15 | 1994-09-20 | Motorola, Inc. | Method and apparatus for broken link detect using audio energy level |
JPH05292006A (ja) * | 1992-04-07 | 1993-11-05 | Matsushita Electric Ind Co Ltd | コードレス電話装置 |
JPH05347582A (ja) * | 1992-06-15 | 1993-12-27 | Funai Electric Co Ltd | キャリア検出方法 |
US5732337A (en) * | 1995-08-10 | 1998-03-24 | Ford Motor Company | Reconfigurable mixer-filter-decimator |
US5715282A (en) * | 1996-05-08 | 1998-02-03 | Motorola, Inc. | Method and apparatus for detecting interference in a receiver for use in a wireless communication system |
-
1994
- 1994-12-14 DE DE69434275T patent/DE69434275T2/de not_active Expired - Lifetime
- 1994-12-14 SG SG1996002110A patent/SG64868A1/en unknown
- 1994-12-14 EP EP94119710A patent/EP0660536B1/en not_active Expired - Lifetime
- 1994-12-19 KR KR1019940034995A patent/KR100355855B1/ko not_active IP Right Cessation
- 1994-12-20 JP JP6340627A patent/JPH07202796A/ja active Pending
- 1994-12-20 CN CN94113250A patent/CN1071983C/zh not_active Expired - Fee Related
- 1994-12-20 MY MYPI94003425A patent/MY114515A/en unknown
-
1997
- 1997-10-23 US US08/998,938 patent/US5864750A/en not_active Expired - Lifetime
-
2007
- 2007-05-16 JP JP2007130235A patent/JP2007251994A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
CN1114491A (zh) | 1996-01-03 |
CN1071983C (zh) | 2001-09-26 |
JPH07202796A (ja) | 1995-08-04 |
MY114515A (en) | 2002-11-30 |
DE69434275T2 (de) | 2005-06-30 |
KR100355855B1 (ko) | 2002-12-16 |
EP0660536A2 (en) | 1995-06-28 |
DE69434275D1 (de) | 2005-03-24 |
SG64868A1 (en) | 1999-05-25 |
US5864750A (en) | 1999-01-26 |
EP0660536A3 (en) | 1995-12-27 |
EP0660536B1 (en) | 2005-02-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0738445B1 (en) | Clear channel selection system for a cordless telephone | |
KR910004059B1 (ko) | 무선전화장치 | |
US4663765A (en) | Data muting method and apparatus for audo-digital communications systems | |
EP0153125A2 (en) | Tone detection apparatus for use in a telephone system | |
US5598431A (en) | Method and apparatus for signal quality detection in a communication system | |
US4525868A (en) | Interference wave detection circuit for use in radio receiver | |
KR20000001839A (ko) | 기지국에서 송수신기의 장애 진단 방법 및 장치 | |
JP2007251994A (ja) | 無線周波信号受信機 | |
KR20040078147A (ko) | 스위치가능한 차단 주파수를 갖는 저역 통과 필터 및 노치필터를 포함하는 고속 세틀링 데이터 슬라이서 | |
JPH11163748A (ja) | トーン信号検出回路 | |
US6744748B1 (en) | Method and apparatus for monitoring errors in a wireless transceiver | |
KR100247040B1 (ko) | 자동 통화절단 장치 및 방법 | |
US4984294A (en) | Radio communications device incorporating channel guard decode and priority channel scanning | |
KR0154694B1 (ko) | 이동체 무선전화기의 감시 오디오 톤신호 분석방법 | |
JPS5452408A (en) | Radiotelephone set | |
KR0169323B1 (ko) | 전화기의 발신음 발생회로 | |
JPH05292017A (ja) | コードレス電話機 | |
JPH0255427A (ja) | スケルチ回路 | |
JP2000232421A (ja) | 無線受信機 | |
JPH0226133A (ja) | 受信波妨害検出装置 | |
KR20000020589A (ko) | 통신 단말기에서 발신 호에 따른 호 연결 검출 장치 및 방법 | |
JP2000174643A (ja) | デジタル無線受信機 | |
JPH1198235A (ja) | 携帯電話用ハンズフリーユニット | |
JPH04267660A (ja) | 空きチャンネル判定方法 | |
KR20000016839A (ko) | 신호처리장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
RD05 | Notification of revocation of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7425 Effective date: 20080318 |
|
RD04 | Notification of resignation of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7424 Effective date: 20080415 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20091118 |
|
A601 | Written request for extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A601 Effective date: 20100210 |
|
A602 | Written permission of extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A602 Effective date: 20100216 |
|
A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20100728 |