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WO2001067448A1 - Platine de lecture de cd universelle - Google Patents

Platine de lecture de cd universelle Download PDF

Info

Publication number
WO2001067448A1
WO2001067448A1 PCT/US2000/006104 US0006104W WO0167448A1 WO 2001067448 A1 WO2001067448 A1 WO 2001067448A1 US 0006104 W US0006104 W US 0006104W WO 0167448 A1 WO0167448 A1 WO 0167448A1
Authority
WO
WIPO (PCT)
Prior art keywords
player
universal
signal
software program
decoding software
Prior art date
Application number
PCT/US2000/006104
Other languages
English (en)
Inventor
Marco Scibora
Original Assignee
Advanced Communication Design, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Advanced Communication Design, Inc. filed Critical Advanced Communication Design, Inc.
Priority to PCT/US2000/006104 priority Critical patent/WO2001067448A1/fr
Priority to EP00916181A priority patent/EP1269470A1/fr
Publication of WO2001067448A1 publication Critical patent/WO2001067448A1/fr

Links

Classifications

    • 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
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
    • 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
    • G11B20/00007—Time or data compression or expansion

Definitions

  • the present invention relates to a universal compact disc (CD) player that allows either portable battery powered or standard AC powered operation to decode any digital audio file from a CD.
  • CD compact disc
  • MPEG Moving Picture Experts Group
  • ISO International Organisation for Standardisation
  • ISO/TEC 11172-1 through -5 MPEG players
  • Real Audio a compression scheme for coding both video and audio for streaming transmission and download over the Internet. This compression scheme was designed by Progressive Networks (now RealNetworks) and has perhaps the largest market share of any of the proprietary schemes. RealNetworks freely distributes a player over the Internet to anyone who wants it.
  • Liquid Audio another proprietary compression scheme for audio and associated lyrics, credits and artwork contained in a single audio file. This compression scheme also uses Dolby Digital encoding to increase the quality of the audio. Like RealNetworks, Liquid Audio provides a free player.
  • A2b another proprietary transmission scheme developed by AT&T.
  • Encoders involve sophisticated mathematical processing to reduce the size of the audio file without a one-for-one reduction in quality. Based on research of human perception, the encoder decides what information is elementary and what can be stripped. For example, in MPEG the audio encoder removes a weaker signal that follows a strong signal, because the weaker signal would not be recognized by the brain even if allowed to pass to the ear. The higher the compression, the more information is stripped, and the more likely that the listener will perceive a difference in audio quality.
  • Decoders use sophisticated mathematical processing to decompress the encoded audio file.
  • the sophisticated mathematical processing used by a decoder may be carried out by any computer.
  • Today, thousands of people are downloading MPEG files over the Internet and decoding them using free players which use the microprocessor of the personal computer, in conjunction with a "sound card", to implement the decoder. But these people, and others, also want the ability to play these compressed files in a portable device. No flexible means of compressed music playback without the use of a computer exists at present.
  • the present invention provides such a solution through the use of digital signal processing (DSP) technology integrated into a CD player's decoder.
  • DSP digital signal processing
  • a universal compact disc (CD) player having the ability to decode and play an encoded audio file residing on a CD, regardless of the particular encoding algorithm used to encode the audio file, consists of: a spindle motor and optical pickup adapted to read the signal recorded on the CD; an amplifier to amplify the signal read by the pickup; a programmable digital signal processor adapted to decode the amplified signal under the direction of a decoding software program; a nonvolatile memory containing the decoding software program directing the operation of the digital signal processor; a program adapted to copy the decoding software program from a memory card into the nonvolatile memory; a digital-to-analog converter to convert the decoded signal into an analog audio signal; and a speaker or headphones to convert the analog audio signal into sound.
  • a spindle motor and optical pickup adapted to read the signal recorded on the CD
  • an amplifier to amplify the signal read by the pickup
  • a programmable digital signal processor adapted to decode the amplified signal under
  • a principal object and advantage of the present invention is that it can decode and play an audio file on a CD which was encoded by any of a number of different encoding schemes.
  • Another principal object and advantage of the present invention is that it can decode and play compressed audio files without the need for a personal computer.
  • Another principal object and advantage of the present invention is that it provides a completely portable means for playing compressed audio files.
  • Another principal object and advantage of the present invention is that it can play standard (uncompressed) CDs.
  • Another principal object and advantage of the present invention is that it accepts any decoding software program which could be downloaded from an external memory card.
  • Another principal object and advantage of the present invention is that it allows a copy indicator such as a unique serial number for each CD player which prevents the use of a purchased memory card on another CD player, thus protecting manufacturers' copyrights in the decoding software.
  • Figure 1 is a block diagram of the universal CD player of the present invention.
  • FIG. 1 A block diagram of the universal CD player of the present invention is shown in Figure 1 and is generally referenced as reference numeral 10.
  • the universal CD player 10 comprises a drive means 12 for spinning a CD and an optical sensing means 14 for reading the signal encoded on the CD.
  • the drive means 12 comprises a spindle motor 16 and the optical sensing means 14 comprises an optical pickup 18.
  • the universal CD player 10 further comprises a signal amplifier 20 for amplifying the signal read by the optical sensing means 14 and producing an amplified signal.
  • the amplified signal from the amplifier 20 is fed into a programmable digital signal processor (DSP) 24.
  • DSPs are readily available from a large number of sources, one example being the Butterfly DSP from SHARP Microelectronics, 5700 NW Pacific Rim Blvd., Camas, WA 98607.
  • the DSP is "programmable" when its operation is directed by a decoding software program, as will be described below. This distinguishes the element from single-purpose chips such as the MPEG decoder chip disclosed in U.S. Patent No. 5,617,386 and the single-purpose signal processor disclosed in U.S. Patent No. 5,428,592.
  • the DSP 24 is adapted to decode the amplified signal under the direction of a decoding software program.
  • the universal CD player 10 further comprises at least one decoding software program directing the operation of the DSP 24.
  • This decoding software program is stored in a memory means 26.
  • the memory means 26 is preferably a nonvolatile memory 28, which retains its contents in the absence of external power and is readable and writable.
  • the universal CD player 10 further comprises a means 30 for copying the decoding software program into the memory means 26 from an external source.
  • the means 30 reads a memory card 32 inserted into the universal CD player 10.
  • the means 30 may be the DSP 24 or a separate processor
  • the universal CD player 10 further comprises a digital-to-analog converter (DAC) 34 to convert the decoded signal into an analog audio signal.
  • DAC digital-to-analog converter
  • the universal CD player 10 further comprises sound reproduction means 36 for converting the analog audio signal to sound.
  • the sound reproduction means 36 may be a speaker 38 or earphone 40.
  • the universal CD player 10 may preferably include a noneraseable copy indicator (not shown), preferably stored in the nonvolatile memory 28, and adapted to be transferred to the memory card 32, as will be discussed below.
  • the copy indicator is a serial number unique to each instance of the universal CD player 10.
  • the universal CD player 10 may be manufactured with the nonvolatile memory 28 containing a decoding software program for standard CDDA encoding (used on all standard CD players). Additionally, the nonvolatile memory 28 may initially contain a decoding software program for MPEG. Therefore, the user will be able to play standard CD (CDDA) recordings without purchasing any memory cards. The user will also be able to play MPEG recordings.
  • CDDA standard CD
  • MPEG MPEG
  • All other licensed formats of compression schemes (such as RealAudio, Liquid Audio, and a2b) will require the user to purchase them pre-loaded on a memory card.
  • Each memory card (available through any retail outlet) will have the decoding software on it.
  • the decoding software program When the memory card 32 is inserted into the CD player 10, the decoding software program will be transferred to the nonvolatile memory 28 and the user will then be able to play CDs with audio files encoded with that particular compression scheme.
  • the universal CD player may implement copyright protection for the decoding software as follows. When the memory card 32 is inserted in the CD player 10, the nonerasable copy indicator will be transferred from the nonvolatile memory 28 to the memory card 32 at a hidden location on the memory card.
  • the second CD player will not allow the decoding software to load because the copy indicator in the second CD player does not match the copy indicator on the memory card. Since all decoding software licenses are based on a per player basis, this design protects the decoder's copyrights. If and when licensing issues no longer apply, a memory card upgrade will be available to do away with the copy indicator licensing protection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

La présente invention concerne une platine de lecture de compact disque (CD) universelle qui peut décoder et lire un fichier audio codé sur un CD, sans tenir compte de l'algorithme de codage particulier utilisé pour coder ce fichier audio. Ce lecteur comprend: un moteur de broche de centrage (12, 16) et un lecteur optique (14, 18) adapté pour lire le signal enregistré sur le CD, un amplificateur (20) destiné à amplifier le signal lu par le lecteur, un processeur (24) de signal numérique programmable adapté pour décoder le signal amplifié sous la direction d'un programme logiciel de décodage, une mémoire (26, 28) non volatile contenant ce programme logiciel de décodage dirigeant le fonctionnement du processeur de signal numérique, un programme adapté pour lire ce programme logiciel de décodage à partir d'une carte (32) à mémoire dans la mémoire non volatile, un convertisseur (34) numérique-analogique destiné à convertir le signal décodé en signal audio analogique, et un haut-parleur (38) ou un casque d'écoute (40) destiné à convertir le signal audio analogique en son.
PCT/US2000/006104 2000-03-09 2000-03-09 Platine de lecture de cd universelle WO2001067448A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US2000/006104 WO2001067448A1 (fr) 2000-03-09 2000-03-09 Platine de lecture de cd universelle
EP00916181A EP1269470A1 (fr) 2000-03-09 2000-03-09 Platine de lecture de cd universelle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/006104 WO2001067448A1 (fr) 2000-03-09 2000-03-09 Platine de lecture de cd universelle

Publications (1)

Publication Number Publication Date
WO2001067448A1 true WO2001067448A1 (fr) 2001-09-13

Family

ID=21741131

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/006104 WO2001067448A1 (fr) 2000-03-09 2000-03-09 Platine de lecture de cd universelle

Country Status (2)

Country Link
EP (1) EP1269470A1 (fr)
WO (1) WO2001067448A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2367469A (en) * 2000-06-30 2002-04-03 Graeme Roy Smith Modular software definable pre-amplifier
WO2007083321A2 (fr) * 2006-01-17 2007-07-26 Trinity Future - In Pvt Ltd Lecteur audio doté d'un dispositif de duplication commandé

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0720157A2 (fr) * 1994-12-29 1996-07-03 Mitsumi Electric Company Ltd. Appareil d'entraînement à disque compact vidéo
JPH08237711A (ja) * 1995-02-24 1996-09-13 Inter Wave:Kk ボイスページャーおよび中央制御局におけるデータ送出方法
JPH09185868A (ja) * 1995-10-30 1997-07-15 Victor Co Of Japan Ltd 光ディスク装置
US5839108A (en) * 1996-03-07 1998-11-17 Norris Communications, Inc. Flash memory file system in a handheld record and playback device
EP0920013A1 (fr) * 1997-11-25 1999-06-02 N.V. dZine Ensemble pour la distribution de données audio numériques

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0720157A2 (fr) * 1994-12-29 1996-07-03 Mitsumi Electric Company Ltd. Appareil d'entraînement à disque compact vidéo
JPH08237711A (ja) * 1995-02-24 1996-09-13 Inter Wave:Kk ボイスページャーおよび中央制御局におけるデータ送出方法
JPH09185868A (ja) * 1995-10-30 1997-07-15 Victor Co Of Japan Ltd 光ディスク装置
US5839108A (en) * 1996-03-07 1998-11-17 Norris Communications, Inc. Flash memory file system in a handheld record and playback device
EP0920013A1 (fr) * 1997-11-25 1999-06-02 N.V. dZine Ensemble pour la distribution de données audio numériques

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 01 31 January 1997 (1997-01-31) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 11 28 November 1997 (1997-11-28) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2367469A (en) * 2000-06-30 2002-04-03 Graeme Roy Smith Modular software definable pre-amplifier
GB2367469B (en) * 2000-06-30 2004-10-20 Graeme Roy Smith Software definable pre-amplifier
US7158843B2 (en) 2000-06-30 2007-01-02 Akya Holdings Limited Modular software definable pre-amplifier
WO2007083321A2 (fr) * 2006-01-17 2007-07-26 Trinity Future - In Pvt Ltd Lecteur audio doté d'un dispositif de duplication commandé
WO2007083321A3 (fr) * 2006-01-17 2007-10-04 Trinity Future In Pvt Ltd Lecteur audio doté d'un dispositif de duplication commandé

Also Published As

Publication number Publication date
EP1269470A1 (fr) 2003-01-02

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