CN100440742C - 无线信号丢失检测 - Google Patents

无线信号丢失检测 Download PDF

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CN100440742C
CN100440742C CNB038130688A CN03813068A CN100440742C CN 100440742 C CN100440742 C CN 100440742C CN B038130688 A CNB038130688 A CN B038130688A CN 03813068 A CN03813068 A CN 03813068A CN 100440742 C CN100440742 C CN 100440742C
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decoder
audio file
file signal
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phase
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CN1659788A (zh
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卡齐米尔·约翰·克劳利
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Thomson Licensing SAS
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    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10222—Improvement or modification of read or write signals clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation
    • 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
    • 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
    • H04L27/16—Frequency regulation arrangements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
    • G11B2020/1461—8 to 14 modulation, e.g. the EFM code used on CDs or mini-discs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0071—Control of loops
    • H04L2027/0073—Detection of synchronisation state

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuits Of Receivers In General (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Reverberation, Karaoke And Other Acoustics (AREA)

Abstract

一种设备，包括：接收机，用于接收音频文件信号；解码器(22)，用于解调所述音频文件信号；以及处理器(24)，用于向所述解码器轮询在所述音频文件信号的解调时的锁相损耗。所述处理器响应所述锁相中的所述损耗，重置和重新初始化所述解码器。所述接收机包括900MHz射频接收电路(23)。所述解码器包括8到14比特调制EFM解码器。在优选实施例中，所述解码器输出符合已知I2S音频流格式的数字音频流。

Description

无线信号丢失检测
技术领域
本发明通常涉及无线通信，更具体地，涉及无线信号丢失检测。
背景技术
许多消费者想要通过在音频系统上播放音频文件，享用在其PC上存储的数字音频文件的大量收集。用户已经将音频文件从CD存储器传送到其个人计算机上。播放通过个人计算机直接从因特网网站到家庭音频系统的音频文件允许使用计算机的处理和存储能力来增加播放列表、以及利用ID3标记歌曲数据来组织数字音乐文件库，以显示艺术家、歌曲集、歌曲标题和流派。个人计算机和音频系统之间的无线传输和接收将实现用户更高质量的收听体验。
无线发射机和接收机技术必须能够将CD质量的数字音频从个人计算机发送到音频系统。投币式自动电唱机管理的个人计算机内容的有效用户和寻求收听数字质量的音乐文件的替代物的因特网音频收听者需要在其个人计算机和音频系统之间的方便的连接。为了在收听从个人计算机或网站可得到的数字质量的音乐文件时完整的用户体验，需要音频文件源和音频系统之间的连续传输和接收。
在来自音频文件发射器源的长期传输空闲之后，应用于传送到无线接收机的音频文件上的无线传输技术可以停止其解码。由接收机解码时的锁相环可以解锁。由接收机引起的锁相环的丢失将需要用户手动地重新建立对来自发射机的音频文件传输进行解码时的锁相环。因此，存在以下需要：在接收机和信号发射机之间检测信号丢失，并且自动重置信号相位锁定，以保持在无线通信链路上接收到的音频文件的接近无缝播放。
发明内容
本设备包括：接收机，用于接收音频文件信号；解码器，用于解调所述音频文件信号；以及处理器，用于向所述解码器轮询在所述音频文件信号的解调时的锁相丢失。所述处理器响应所述锁相中的所述丢失，重置和重新初始化所述解码器。所述接收机包括900MHz射频接收电路。所述解码器包括8到14比特调制EFM解码器。在优选实施例中，所述解码器输出符合已知I2S音频流格式的数字音频流。
本计算机可读介质包含软件指令，当由处理器执行时，所述指令执行以下步骤：接收调制后的音频文件信号；解调所述调制后的音频文件信号；向所述解调轮询在所述解调时的锁相丢失；以及响应所述锁相中的所述丢失，重置和重新初始化所述解调。优选地，所述解调是与由数字编码调制的900MHz范围的载频同步的8到14比特EFM比特数字编码的解调。
一种检测无线音频文件信号传输中的信号丢失的方法包括步骤：接收音频文件信号；解码所述音频文件信号；以及向所述解码轮询在所述音频文件信号解码时的锁相丢失。响应解码中的锁相的丢失，重置和重新初始化所述解码器。优选地，所述接收步骤与由音频文件信号调制的900MHz范围的载频同步。所述解码步骤包括8到14比特调制EFM解码。
附图说明
考虑结合附图的以下描述，可以获得对本发明的更完整的理解，其中：
图1示出了包括因特网网络、计算机、无线发射机、无线接收机和音频系统的典型通信环境；
图2是用于实现本发明的典型无线接收机的方框图；以及
图3示出了适合于在图2中的接收机使用的无线锁相环解锁条件和恢复流程图；
为了便于理解，在可能的位置上，已经使用了相同的参考符号来表示这些图中共有的相同组件。
具体实施方式
图1示出了典型通信环境10，包括典型网络12，例如因特网；具有无线发射机13的个人计算机11；以及无线接收机14。无线发射机13通过无线介质15，将计算机11上的音频文件传送到无线接收机14。然后，无线接收机向音频系统16发送模拟立体声信号。所述音频文件可以是各种文件类型中的任一个，例如mp3，在计算机关闭期间为保存而存储的文件或当计算机充当通过因特网到无线接收机14的音频文件传输的管道时临时存储的文件。发射机13可以是计算机结构的集成组件或通过诸如通用串行总线连接USB等端口连接与计算机通信的附加设备。显示为膝上型计算机的典型计算机11可以是桌面计算机系统或基于处理器的设备，能够中继通过网络到无线接收机14的音频文件的传送。
图2是典型无线接收机的方框图。将在天线25处接收到的输入的调制后或编码后的模拟信号接收到包含频率合成器的接收电路板23中，所述频率合成器用于使接收机与900MHz的范围内的发射机载频同步。由8到14比特调制解码器22对编码的信号进行解码。8到14比特EFM编码是用于光盘CD编码的已知编码技术。由立体声数字到模拟转换器DAC 21将来自解码器22的数字音频流I2S改变为到音频系统的模拟立体声输入信号。优选地，解码器22和处理器24之间的通信协议符合已知的I2C总线协议。优选地，处理器是通过微线总线连接到接收电路23上的微处理器。所述处理器控制频率合成器，用于使接收机与音频文件信号源发射机的无线载频同步。处理器24还执行本发明的无线音频文件信号丢失检测，并且当检测到无线音频文件的丢失时，执行解码器22的重置和初始化。
图3是在图2的接收机中使用的检测无线锁相环PLL解锁条件的流程图和恢复流程图。处理器24连续地轮询解码器32，以确定输入的音频文件信号解调时的锁相环是否已经丢失33。如果解码器的锁相环PLL已经解锁，则处理器进行解码器的软件重置，并重新初始化解码天线25处接收到的音频文件信号时的锁相环条件。如果解码器的锁相环PLL保持锁定，则处理器24继续向解码器轮询锁相环中的解锁条件。自动EFM PLL解锁条件检测和恢复实现了无用户知道或干预的必要。
尽管这里已经详细示出和描述了包括本发明的教导的各种实施例，本领域的技术人员能够容易地设想也将包括这些教导的各种变化的实施例。已经在从个人计算机中接收音频文件的传输的音频系统的环境中对本发明进行了描述。本领域的技术人员将会意识到，在无线信号正在传送计算机上所存储的音频文件或通过网络下载到计算机上的音频文件以便形成传送到音频系统的流的情况下，可以实施本发明涉及无线信号丢失检测恢复的教导。所述音频系统可以配备有模拟立体声输入插孔(jack)，例如具有“线路”或“辅助”插孔的家庭立体声，用于接收立体声音频信号。

Claims (12)

1.一种用于检测无线信号丢失的设备，包括：
接收机(23)，用于接收音频文件信号；
解码器(22)，用于解码所述音频文件信号；以及
处理器(24)，用于向所述解码器轮询在所述音频文件信号的解码时的锁相丢失。
2.根据权利要求1所述的设备，其特征在于：所述处理器响应所述锁相丢失，重置和重新初始化所述解码器。
3.根据权利要求1所述的设备，其特征在于：所述接收机包括900MHz射频接收电路。
4.根据权利要求1所述的设备，其特征在于：所述解码器包括8到14比特调制EFM解码器。
5.根据权利要求1所述的设备，其特征在于：所述解码器输出数字音频流。
6.根据权利要求5所述的设备，其特征在于：所述数字音频流符合I2S音频流。
7.一种检测无线音频文件信号传输中的信号丢失的方法，所述方法包括：
接收步骤，接收音频文件信号；
解码步骤，利用解码器来解码所述音频文件信号；以及
轮询步骤，向所述解码步骤中的解码器轮询在所述音频文件信号解码时的锁相丢失(32)。
8.根据权利要求7所述的方法，其特征在于还包括步骤：响应所述解码步骤的所述锁相丢失，重置和重新初始化所述解码步骤中的解码器。
9.根据权利要求7所述的方法，其特征在于所述接收步骤包括900MHz的载波同步。
10.根据权利要求7所述的方法，其特征在于所述解码步骤包括8到14比特调制EFM解码。
11.根据权利要求7所述的方法，其特征在于所述解码步骤包括输出数字音频流。
12.根据权利要求11所述的方法，其特征在于所述数字音频流符合12S音频流。
CNB038130688A 2002-06-04 2003-06-03 无线信号丢失检测 Expired - Fee Related CN100440742C (zh)

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1878783A1 (en) * 2006-07-14 2008-01-16 BIOeCON International Holding N.V. Modified biomass comprising synthetically grown carbon fibers
US20090293072A1 (en) * 2006-07-21 2009-11-26 Sony Service Centre (Europe) N.V. System having plurality of hardware blocks and method of operating the same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5850415A (en) * 1993-01-12 1998-12-15 Usa Digital Radio Partners, L.P. In-band on-channel digital broadcasting
US5878336A (en) * 1996-03-22 1999-03-02 Motorola, Inc. Apparatus and method for discontinuously operating a receiver
US5950115A (en) * 1997-08-29 1999-09-07 Adaptec, Inc. GHz transceiver phase lock loop having autofrequency lock correction
US6182128B1 (en) * 1998-03-05 2001-01-30 Touchmusic Entertainment Llc Real-time music distribution systems
CN1287745A (zh) * 1998-11-04 2001-03-14 夏普公司 数字广播接收系统
WO2001041403A2 (en) * 1999-12-06 2001-06-07 Shanahan Michael E Methods and apparatuses for programming user-defined information into electronic devices

Family Cites Families (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4544964A (en) * 1978-02-24 1985-10-01 Burroughs Corporation Strobe for read/write chain
JPH01196946A (ja) * 1988-02-01 1989-08-08 Toshiba Corp 周波数制御装置
JPH0734547B2 (ja) * 1988-06-16 1995-04-12 パイオニア株式会社 ミューティング制御回路
JPH0282835A (ja) * 1988-09-20 1990-03-23 Sony Corp ディジタル信号受信装置
JPH03159420A (ja) * 1989-11-17 1991-07-09 Oki Electric Ind Co Ltd Ｐｌｌ方式タイミング抽出回路
JP2578693B2 (ja) * 1991-02-27 1997-02-05 三洋電機株式会社 インターフェイス回路
EP0523778B1 (en) * 1991-07-15 1996-10-02 Koninklijke Philips Electronics N.V. Direct conversion receiver
US5491839A (en) * 1991-08-21 1996-02-13 L. S. Research, Inc. System for short range transmission of a plurality of signals simultaneously over the air using high frequency carriers
US5432521A (en) * 1994-01-14 1995-07-11 Motorola, Inc. Satellite receiver system having doppler frequency shift tracking
JP2833540B2 (ja) * 1995-09-14 1998-12-09 日本電気株式会社 ディジタル放送用衛星放送受信機
EP0782271B1 (en) 1995-12-28 2002-03-13 Thomson Consumer Electronics, Inc. Phase locked loop with controllable response time
US5619582A (en) * 1996-01-16 1997-04-08 Oltman; Randy Enhanced concert audio process utilizing a synchronized headgear system
EP0880827A1 (en) * 1996-02-07 1998-12-02 L.S. Research, Inc. Digital wireless speaker system
US5714932A (en) * 1996-02-27 1998-02-03 Radtronics, Inc. Radio frequency security system with direction and distance locator
EP0810750B1 (en) * 1996-05-30 2005-07-13 Matsushita Electric Industrial Co., Ltd. Digital broadcast receiver
US7058376B2 (en) * 1999-01-27 2006-06-06 Logan James D Radio receiving, recording and playback system
JP3575929B2 (ja) * 1996-10-21 2004-10-13 株式会社東芝 復調器
JP3893696B2 (ja) * 1997-10-24 2007-03-14 カシオ計算機株式会社 通信端末装置
US6466832B1 (en) * 1998-08-24 2002-10-15 Altec Lansing R & D Center Israel High quality wireless audio speakers
JP2000101555A (ja) * 1998-09-28 2000-04-07 Nec Eng Ltd 同期制御システム
US6772021B1 (en) * 1998-11-16 2004-08-03 Creative Technology Ltd. Digital audio data receiver without synchronized clock generator
US6389548B1 (en) * 1999-04-12 2002-05-14 Liam Bowles Pulse run-length measurement for HF data signal by dividing accumulated phase difference between first and second zero-crossings by single-cycle range using multiple cycle range sawtooth waveform
US6510182B1 (en) * 1999-10-25 2003-01-21 Freesystems Pte. Ltd. Wireless infrared digital audio system
JP4304802B2 (ja) * 1999-12-17 2009-07-29 ソニー株式会社 ダビング装置
US7031476B1 (en) * 2000-06-13 2006-04-18 Sharp Laboratories Of America, Inc. Method and apparatus for intelligent speaker
KR20020001348A (ko) * 2000-06-28 2002-01-09 윤종용 근거리 이동무선시스템을 이용하여 디지탈 오디오데이타를 청취할 수 있는 헤드셋
US7251833B2 (en) * 2000-12-29 2007-07-31 International Business Machines Corporation Digital media delivery with local cache and streaming tokens
US20020159434A1 (en) * 2001-02-12 2002-10-31 Eleven Engineering Inc. Multipoint short range radio frequency system
KR20020089630A (ko) * 2001-05-23 2002-11-30 (주)오픈브레인테크 블루투스 카키트를 통한 온라인 음악 배포 시스템 및 그 방법
US6717533B2 (en) * 2001-05-31 2004-04-06 Motorola, Inc. Method and apparatus for combining a wireless receiver and a non-wireless receiver
US7050809B2 (en) * 2001-12-27 2006-05-23 Samsung Electronics Co., Ltd. System and method for providing concurrent data transmissions in a wireless communication network
US20030158614A1 (en) * 2002-02-18 2003-08-21 Friel Joseph T Audio system for vehicle with battery-backed storage
US20030181182A1 (en) * 2002-03-22 2003-09-25 Hoi Ho Sing Receiver for wireless transmission system
US7209532B2 (en) * 2002-03-28 2007-04-24 Harris Corporation Phase lock loop and method for coded waveforms
EP1530828A4 (en) * 2002-07-09 2011-05-25 Thomson Licensing AUTOMATIC JUMPING BETWEEN WIRELESS EFM CHANNELS

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5850415A (en) * 1993-01-12 1998-12-15 Usa Digital Radio Partners, L.P. In-band on-channel digital broadcasting
US5878336A (en) * 1996-03-22 1999-03-02 Motorola, Inc. Apparatus and method for discontinuously operating a receiver
US5950115A (en) * 1997-08-29 1999-09-07 Adaptec, Inc. GHz transceiver phase lock loop having autofrequency lock correction
US6182128B1 (en) * 1998-03-05 2001-01-30 Touchmusic Entertainment Llc Real-time music distribution systems
CN1287745A (zh) * 1998-11-04 2001-03-14 夏普公司 数字广播接收系统
WO2001041403A2 (en) * 1999-12-06 2001-06-07 Shanahan Michael E Methods and apparatuses for programming user-defined information into electronic devices

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JP2005528843A (ja) 2005-09-22
EP1525667A4 (en) 2010-01-27
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US20050152477A1 (en) 2005-07-14
KR20050019110A (ko) 2005-02-28
CN1659788A (zh) 2005-08-24
DE60334908D1 (de) 2010-12-23
EP1525667B1 (en) 2010-11-10
US7860460B2 (en) 2010-12-28
AU2003240489A1 (en) 2003-12-19
KR101009956B1 (ko) 2011-01-20
WO2003103171A1 (en) 2003-12-11

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