JP4067489B2 - ステレオデコーダ - Google Patents
ステレオデコーダ Download PDFInfo
- Publication number
- JP4067489B2 JP4067489B2 JP2003521490A JP2003521490A JP4067489B2 JP 4067489 B2 JP4067489 B2 JP 4067489B2 JP 2003521490 A JP2003521490 A JP 2003521490A JP 2003521490 A JP2003521490 A JP 2003521490A JP 4067489 B2 JP4067489 B2 JP 4067489B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- difference
- stereo
- gain control
- circuit arrangement
- 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
Links
- 230000001360 synchronised effect Effects 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 230000003321 amplification Effects 0.000 claims description 16
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 3
- 230000001629 suppression Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 8
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/22—Homodyne or synchrodyne circuits
- H03D1/2209—Decoders for simultaneous demodulation and decoding of signals composed of a sum-signal and a suppressed carrier, amplitude modulated by a difference signal, e.g. stereocoders
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving
- H04H40/45—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving
- H04H40/63—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving for separation improvements or adjustments
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Stereo-Broadcasting Methods (AREA)
- Circuits Of Receivers In General (AREA)
Description
AM 利得制御増幅手段
ATT 6 dB減衰器
DET FM弁別器
DIV 周波数デバイダ
DMX デマトリクス回路
IF IFセクション
LO 局部発振器
LP1, LPS, LPD ローパスフィルタ
LP2 ループフィルタ
M1, M2, M3 ミキサ段
PD 位相検出器
RF RF入力増幅器・チューニングセクション
SD ステレオデコーディング回路配置
SUB 差分回路
Claims (7)
- ベースバンド和信号(L+R)、副搬送波抑圧方式で振幅変調された差信号(L-R)、および、当該和信号の周波数帯と差信号の周波数帯との間に位置する周波数を持つパイロット信号を有するステレオ多重信号をデコードするための回路配置であって、当該回路配置が、並列のステレオ和信号パスと差信号パスとを通してデマトリクス回路の第1および第2の入力に結合された、前記ステレオ多重信号のための入力を持ち、同期復調器が、前記差信号パスに含まれる第 1 のミキサ段を有しており、局部交番副搬送波が、当該振幅変調された差信号(L-R)のベースバンドへの同期復調のために、当該同期復調器の搬送波入力に供給される回路配置において、リファレンス信号を受け取る第 2のミキサ段を有する自動利得制御ループが存在し、その第 2のミキサ段の信号出力が、第 3のミキサ段に結合され、当該第 2 および第 3 のミキサ段が、当該リファレンス信号のそれぞれアップ変換およびダウン変換のために、当該局部交番副搬送波を供給される搬送波入力を持ち、当該第 3のミキサ段の信号出力が、6 dB減衰器を通して、前記減衰器の出力信号と前記リファレンス信号との差分を供給する差分回路に結合され、当該差分回路が、当該同期復調器の第 1 のミキサ段および当該第 2および第 3のミキサ段の利得を変化させるために、利得制御増幅手段の制御入力に結合されていることを特徴とする回路配置。
- 当該利得制御増幅手段が、当該局部交番副搬送波の振幅を、それを当該同期復調器、および、当該第1および第2のミキサ段の搬送波入力に供給するに先立って、変化させるための利得制御副搬送波増幅器を有することを特徴とする請求項1に記載の回路配置。
- 当該利得制御増幅手段は、各々が、前記利得制御増幅手段の制御入力で共通の制御入力を持つ、第1から第3の互いに一致し合う利得制御増幅器を有しており、当該第1の利得制御増幅器が、前記差信号パスに含まれており、そして、当該第2および第3の利得制御増幅器が、前記自動利得制御ループに含まれていることを特徴とする請求項1に記載の回路配置。
- 当該リファレンス信号が、DCレベル電圧であることを特徴とする請求項1から3のいずれかに記載の回路配置。
- 当該6dB減衰器が、2つの直列接続された、互いに等しい抵抗を有する抵抗電圧デバイダを有することを特徴とする請求項1から4のいずれかに記載の回路配置。
- 当該局部交番副搬送波を供給する電圧制御発振器が、位相同期ループに含まれており、当該パイロット信号が、当該局部交番副搬送波を当該パイロット信号に同位相で位相同期させるために、当該電圧制御発振器を制御する位相検波器に供給されることを特徴とする請求項1から5のいずれかに記載の回路配置。
- 請求項1から6のいずれかに記載の、ステレオ多重信号をデコードするための回路配置を有するFMラジオ受信器。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01203048A EP1284542A1 (en) | 2001-08-12 | 2001-08-12 | Stereodecoder |
PCT/EP2002/008809 WO2003017512A1 (en) | 2001-08-12 | 2002-08-06 | Stereodecoder |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005500732A JP2005500732A (ja) | 2005-01-06 |
JP4067489B2 true JP4067489B2 (ja) | 2008-03-26 |
Family
ID=8180780
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2003521490A Expired - Fee Related JP4067489B2 (ja) | 2001-08-12 | 2002-08-06 | ステレオデコーダ |
Country Status (6)
Country | Link |
---|---|
US (1) | US7133527B2 (ja) |
EP (2) | EP1284542A1 (ja) |
JP (1) | JP4067489B2 (ja) |
AT (1) | ATE413734T1 (ja) |
DE (1) | DE60229753D1 (ja) |
WO (1) | WO2003017512A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1609092A2 (en) * | 2003-04-03 | 2005-12-28 | Dublin City University | Shape matching method for indexing and retrieving multimedia data |
US7366488B1 (en) | 2003-12-15 | 2008-04-29 | Marvell International Ltd. | Digital carrier-recovery scheme for FM stereo detection |
US8306493B2 (en) * | 2010-04-13 | 2012-11-06 | Newport Media, Inc. | Pilot based adaptation for FM radio receiver |
EP2822259B1 (en) * | 2013-07-02 | 2019-09-11 | Nxp B.V. | Mobile device able to switch beween private mode and hands-free mode |
CN104618043B (zh) * | 2014-12-22 | 2018-12-21 | 大唐半导体设计有限公司 | 接收机信号质量评估方法及装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2511026A1 (de) * | 1975-03-13 | 1976-09-16 | Siemens Ag | Schaltungsanordnung zur kontinuierlichen basisbreiteneinstellung in einem stereodecoder |
NL186732C (nl) * | 1978-01-25 | 1991-02-01 | Philips Nv | Ruisreduktieschakeling voor stereosignalen. |
NL8603249A (nl) * | 1986-12-22 | 1988-07-18 | Philips Nv | Inrichting voor het decoderen van een stereomultiplexsignaal. |
US5257312A (en) * | 1991-05-03 | 1993-10-26 | U.S. Philips Corporation | Time-discrete stereo decoder |
SG48272A1 (en) * | 1991-07-15 | 1998-04-17 | Philips Electronics Nv | Receiver |
DE4128045A1 (de) * | 1991-08-23 | 1993-02-25 | Telefunken Sendertechnik | Rauschunterdrueckungsverfahren fuer den stereo-rundfunk |
JPH11136154A (ja) * | 1997-10-31 | 1999-05-21 | Sony Corp | 受信装置 |
-
2001
- 2001-08-12 EP EP01203048A patent/EP1284542A1/en not_active Withdrawn
-
2002
- 2002-08-06 EP EP02794757A patent/EP1417771B1/en not_active Expired - Lifetime
- 2002-08-06 JP JP2003521490A patent/JP4067489B2/ja not_active Expired - Fee Related
- 2002-08-06 AT AT02794757T patent/ATE413734T1/de not_active IP Right Cessation
- 2002-08-06 WO PCT/EP2002/008809 patent/WO2003017512A1/en active Application Filing
- 2002-08-06 DE DE60229753T patent/DE60229753D1/de not_active Expired - Fee Related
- 2002-08-06 US US10/486,599 patent/US7133527B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1417771B1 (en) | 2008-11-05 |
ATE413734T1 (de) | 2008-11-15 |
EP1284542A1 (en) | 2003-02-19 |
EP1417771A1 (en) | 2004-05-12 |
JP2005500732A (ja) | 2005-01-06 |
US7133527B2 (en) | 2006-11-07 |
US20040208323A1 (en) | 2004-10-21 |
DE60229753D1 (de) | 2008-12-18 |
WO2003017512A1 (en) | 2003-02-27 |
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