JPH09505973A - 閾値拡大fm復調器およびこれを具える受信機 - Google Patents
閾値拡大fm復調器およびこれを具える受信機Info
- Publication number
- JPH09505973A JPH09505973A JP8511557A JP51155796A JPH09505973A JP H09505973 A JPH09505973 A JP H09505973A JP 8511557 A JP8511557 A JP 8511557A JP 51155796 A JP51155796 A JP 51155796A JP H09505973 A JPH09505973 A JP H09505973A
- Authority
- JP
- Japan
- Prior art keywords
- demodulator
- phase
- terminal
- input
- filter
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/001—Details of arrangements applicable to more than one type of frequency demodulator
- H03D3/003—Arrangements for reducing frequency deviation, e.g. by negative frequency feedback
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/22—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of active elements with more than two electrodes to which two signals are applied derived from the signal to be demodulated and having a phase difference related to the frequency deviation, e.g. phase detector
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
- H03D2200/0041—Functional aspects of demodulators
- H03D2200/0082—Quadrature arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
- Circuits Of Receivers In General (AREA)
- Noise Elimination (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.90度の位相関係にあるFM変調入力信号を受信する第1および第2入力端子 (11)および(12)並びに復調FM信号を供給する出力端子(13)を有するFM 復調器において、第1および第2入力端子並びに出力端子を有し、第1入力端子 を前記FM復調器の第1入力端子(11)に結合するとともに出力端子を前記FM 復調器の出力端子(13)に結合する位相比較器(1)と、前記FM復調器の第2 入力端子(12)および前記位相比較器(1)の第2入力端子間に結合され、同調 周波数が制御される同調制御入力端子(17)を具える第1可同調移相手段(2) と、ループフィルタ(3)を具え前記位相比較器(1)の出力端子から前記同調 制御入力端子(17)に至るフィードバック経路とを具えるFM復調器において、 前記フィードバック経路にはベースバンドにトランスポーズされた前記第1可同 調移相手段(2)の逆伝達特性にほぼ相当する伝達特性を有する補償フィルタ( 5)をさらに設けるようにしたことを特徴とするFM復調器。 2.前記FM復調器は、第1および第2入力端子並びに出力端子を有し、第1入 力端子が前記FM復調器の第2入力端子(12)に結合された他の位相比較器(6 )と;前記FM復調器の第1入力端子(11)および前記他の位相比較器(6)の 第2入力端子間に結合され、前記第1可同調移相手段(2)にほぼ相当する同調 周波数が制御される同調制御入力端子(17)を具える第2可同調移相手段(7) と;前記フィードバック経路に設けられた第1および第2入力端子並びに出力端 子を有する減算段(8)とを具え、この減算段はその第1入力端子を前記位相比 較器(1)の出力端子に結合し、第2入力端子を前記他の位相比較器(6)の出 力端子に結合し、出力端子を前記第1および第2移相手段(2,7)の双方の同 調制御入力端子(17,18)にフィードバックし、前記第1および第2移相手段( 2,7)は共振増幅器(9)の一部とし、この共振増幅器はその同調周波数を中 心とする対称伝達特性を有するとともに同相兼直角位相入力端子および出力端子 を有する多相フィルタ(9)とし、この多相フィルタの同相兼直角位相入力端子 を前記FM復調器の第1入力端子(11)および第2入 力端子(12)に夫々結合するとともに同相兼直角位相出力端子を前記第1および 第2移相手段(2,7)の第2入力端子に夫々結合するようにしたことを特徴と する請求項1に記載のFM復調器。 3.前記ループフィルタ(3)はFM変調された入力信号の変調の最低周波数よ りも低いカットオフ周波数を有する一次低域通過フィルタ(3)を具えることを 特徴とする請求項1または2に記載のFM復調器。 4.前記一次低域通過フィルタ(3)を積分器とすることを特徴とする請求項1 に記載のFM復調器。 5.前記積分器(3)および前記補償フィルタ(5)はRCフィルタに組合せ、こ のRCフィルタは、電流がこのフィルタの入力信号に比例して制御される電流源 (43)と、抵抗(42)に直列接続されたコンデンサ(41)とを具え、電流源(43 )の両端の電圧を前記共振増幅器(9)を同調するRCフィルタの出力端子に前 記同調制御入力端子(17)を経て印加するようにしたことを特徴とする請求項2 または4に記載のFM復調器。 6.FM復調器は可変ループ利得を提供する手段(4)と、第1制御端子(14) とを具え、この制御端子(14)を前記可変ループ利得手段(4)の可変利得制御 入力端子に結合するようにしたことを特徴とする請求項3,4または5に記載の FM復調器。 7.FM復調器は前記第1および第2移相手段(2,7)の帯域幅制御入力端子 に結合されこの帯域幅を制御するとともに前記前記補償フィルタ(5)の制御入 力端子に結合され前記第1および第2移相手段(2,7)の帯域幅に従って前記 補償フィルタ(5)の伝達特性を整合する第2制御端子(15)を具えることを特 徴とする請求項1,2,3,4,5および6に記載のFM復調器。 8.RF段(40)と、IF段(20)と、請求項1,2,3,4,5,6または7に 記載のFM復調器(30)と、LF段(40)とを具えることを特徴とするFM信号 を受信する受信機。 9.RF段(40)と、IF段(20)と、請求項6に記載のFM復調器(30)と、L F段(40)とを具え、さらに前記FM復調器(30)の第1制御端子(14)に結合 され、このFM復調器(30)の帯域幅を制御する復調器帯域幅制御手段(50 )を具えることを特徴とするFM信号を受信する受信機。 10.RF段(40)と、IF段(20)と、請求項7に記載のFM復調器(30)と、 LF段(40)とを具え、さらに前記FM復調器(30)の第2制御端子(15)に結 合され、帯域幅制御信号を前記第2制御端子(15)に供給する帯域幅制御手段( 60)を具えることを特徴とするFM信号を受信する受信機。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL94202823.4 | 1994-09-30 | ||
EP94202823 | 1994-09-30 | ||
PCT/IB1995/000768 WO1996010864A1 (en) | 1994-09-30 | 1995-09-18 | Fm demodulator with threshold extension and receiver comprising such an fm demodulator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09505973A true JPH09505973A (ja) | 1997-06-10 |
JP3887016B2 JP3887016B2 (ja) | 2007-02-28 |
Family
ID=8217243
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP51155796A Expired - Lifetime JP3887016B2 (ja) | 1994-09-30 | 1995-09-18 | 閾値拡大fm復調器およびこれを具える受信機 |
Country Status (7)
Country | Link |
---|---|
US (1) | US5572164A (ja) |
EP (1) | EP0732003B1 (ja) |
JP (1) | JP3887016B2 (ja) |
KR (1) | KR100354938B1 (ja) |
DE (1) | DE69529455T2 (ja) |
TW (1) | TW269759B (ja) |
WO (1) | WO1996010864A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6005560A (en) * | 1992-10-01 | 1999-12-21 | Quark, Inc. | Multi-media project management and control system |
DE19810558A1 (de) * | 1998-03-11 | 1999-09-16 | Siemens Ag | Integrierbare Funkempfängerschaltung für frequenzmodulierte digitale Signale |
JP4335020B2 (ja) * | 2004-01-15 | 2009-09-30 | パイオニア株式会社 | ノイズ除去装置 |
US7541815B2 (en) * | 2006-03-10 | 2009-06-02 | Advantest Corporation | Electronic device, testing apparatus, and testing method |
US7983643B2 (en) * | 2008-07-03 | 2011-07-19 | Panasonic Corporation | Frequency demodulation with threshold extension |
US9595177B2 (en) | 2014-12-14 | 2017-03-14 | Wg Security Products, Inc. | Noise compensating EAS antenna system |
KR102632074B1 (ko) * | 2021-03-16 | 2024-02-02 | 한국전자통신연구원 | 부궤환 루프 구조의 위상 복조기 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3611168A (en) * | 1970-03-24 | 1971-10-05 | Hughes Aircraft Co | Threshold extension phase-lock demodulator |
US3742361A (en) * | 1971-05-28 | 1973-06-26 | Texas Instruments Inc | Threshold extension phase modulated feedback receiver |
JPS5222867A (en) * | 1975-08-15 | 1977-02-21 | Victor Co Of Japan Ltd | Demodulation system for angle modulated wave signal |
WO1983000974A1 (en) * | 1981-08-31 | 1983-03-17 | Ohta, Tomozo | High-sensitivity fm demodulating system |
US4527276A (en) * | 1984-01-16 | 1985-07-02 | The United States Of America As Represented By The Secretary Of The Army | Digital pulse position modulation communications system with threshold extension |
US4631487A (en) * | 1985-09-24 | 1986-12-23 | Independent Broadcasting Authority | Phase lock loop television signal demodulator |
US4816770A (en) * | 1987-07-10 | 1989-03-28 | Satellite Transmission Systems | Adaptive FM threshold extension demodulator |
NL8801412A (nl) * | 1988-06-02 | 1990-01-02 | Philips Nv | Asymmetrisch polyfase filter. |
JP2560093B2 (ja) * | 1988-10-05 | 1996-12-04 | シャープ株式会社 | Fmチューナ |
US5220686A (en) * | 1989-04-21 | 1993-06-15 | U.S. Philips Corporation | Tunable resonance amplifier |
US5034695A (en) * | 1989-06-16 | 1991-07-23 | Owen Joseph C | Full threshold FM demodulator |
US5095536A (en) * | 1990-03-23 | 1992-03-10 | Rockwell International Corporation | Direct conversion receiver with tri-phase architecture |
EP0574083B1 (en) * | 1992-06-12 | 1997-09-03 | Koninklijke Philips Electronics N.V. | FM quadrature demodulator |
TW214027B (en) * | 1992-06-12 | 1993-10-01 | Philips Electronics Nv | FM quadrature demodulator |
-
1995
- 1995-07-14 TW TW084107305A patent/TW269759B/zh not_active IP Right Cessation
- 1995-09-14 US US08/528,277 patent/US5572164A/en not_active Expired - Lifetime
- 1995-09-18 EP EP95929987A patent/EP0732003B1/en not_active Expired - Lifetime
- 1995-09-18 KR KR1019960702828A patent/KR100354938B1/ko not_active IP Right Cessation
- 1995-09-18 DE DE69529455T patent/DE69529455T2/de not_active Expired - Lifetime
- 1995-09-18 WO PCT/IB1995/000768 patent/WO1996010864A1/en active IP Right Grant
- 1995-09-18 JP JP51155796A patent/JP3887016B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69529455D1 (de) | 2003-02-27 |
EP0732003A1 (en) | 1996-09-18 |
WO1996010864A1 (en) | 1996-04-11 |
KR100354938B1 (ko) | 2002-12-31 |
KR960706712A (ko) | 1996-12-09 |
TW269759B (en) | 1996-02-01 |
EP0732003B1 (en) | 2003-01-22 |
DE69529455T2 (de) | 2003-10-23 |
US5572164A (en) | 1996-11-05 |
JP3887016B2 (ja) | 2007-02-28 |
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