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WO2016000117A1 - Dispositif de lecture multimédia numérique - Google Patents

Dispositif de lecture multimédia numérique Download PDF

Info

Publication number
WO2016000117A1
WO2016000117A1 PCT/CN2014/081126 CN2014081126W WO2016000117A1 WO 2016000117 A1 WO2016000117 A1 WO 2016000117A1 CN 2014081126 W CN2014081126 W CN 2014081126W WO 2016000117 A1 WO2016000117 A1 WO 2016000117A1
Authority
WO
WIPO (PCT)
Prior art keywords
digital
audio
power supply
signal
power
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.)
Ceased
Application number
PCT/CN2014/081126
Other languages
English (en)
Inventor
Qianlong YU
Guangzhi SHI
Zhengdong Wei
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomson Licensing SAS
Original Assignee
Thomson Licensing SAS
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 Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to PCT/CN2014/081126 priority Critical patent/WO2016000117A1/fr
Publication of WO2016000117A1 publication Critical patent/WO2016000117A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • G11B20/10009—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
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers

Definitions

  • the present disclosure relates to a consumer electronics device, and more particularly, relates to a digital media playing device.
  • a mobile digital media player (M-DMP), a portable media player (PMP), or a digital audio player (DAP), is a portable digital consumer electronics device capable of storing and playing digital media such as audio, images, and video files.
  • the data is typically stored on a flash memory, Microdrive (it is a brand name for a miniature, 1 -inch hard disk designed to fit in a CompactFlash (CF) Type II slot.
  • Microdrive it is a brand name for a miniature, 1 -inch hard disk designed to fit in a CompactFlash (CF) Type II slot.
  • CF CompactFlash
  • the release of similar drives by other makers has led to them often being referred to as 'microdrives'), or a hard drive (or a hard disk drive).
  • analog portable audio players play music from non-digital media such as cassette tapes, or records.
  • a digital media playing device comprising a storage for storing a media file; an audio decoder for generating digital signal for audio from the media file; a digital to analog converter for converting digital signal for audio to analog signal and providing the analog signal to a power amplifier; and the power amplifier for amplifying the analog signal; wherein, an optical coupler is added between the audio decoder and the digital to analog converter, and the optical coupler transmits the digital signal for audio from the audio decoder to the digital to analog converter by using light signal.
  • Fig. 1 is a block diagram showing a part of an architecture of a typical audio player according to prior art
  • Fig. 2 is a block diagram showing an architecture of a high quality digital audio player according to a 1 st embodiment of the present invention
  • Fig. 3 is a block diagram showing an architecture of a high quality digital audio player according to a 2 nd embodiment of the present invention
  • Fig. 4 is a block diagram showing an architecture of a high quality digital audio player according to a 3 rd embodiment of the present invention.
  • Fig. 5 is a block diagram showing an architecture of a high quality digital audio player according to a 4 rd embodiment of the present invention.
  • Fig. 1 is a block diagram showing a part of an architecture of a typical audio player according to prior art.
  • the audio player comprises components of a storage, an audio decoder, a digital to analog converter (DAC), a power amplifier (PA) and a power supply. All these components are connected electrically. In other words, the connections between all components are electric connections.
  • the storage stores audio files in at least following audio formats comprising MP3 (MPEG-1 or MPEG-2 audio layer I II), Windows Media Audio (WMA), Advanced Audio Coding (AAC), Waveform Audio File Format (WAV), Ogg Vorbis and Free Lossless Audio Codec (FLAC).
  • the storage can be implemented by a flash memory, Microdrive, a hard disk drive etc. Further, it should note that the storage can be CompactFlash (CF), Secure Digital (SD) and Memory Sticks that are inserted into memory card slots of the audio player.
  • the audio decoder reads an audio file from the storage and decodes the audio file so as to generate digital audio signal and transmits the digital audio signal to DAC.
  • the audio decoder can be implemented by either a dedicated integrated circuit or a common processor together with a computer program implementing one or more algorithms that decompress digital audio data according to one or more given audio formats.
  • the DAC converts the digital audio signal to analog audio signal and provides the analog audio signal to the PA.
  • the DAC can be implemented with an integrated circuit (IC).
  • the PA is an electronic amplifier that amplifies the analog audio signal. And the amplified analog audio signal drives loudspeakers or earphones (not shown in the Fig. 1 ).
  • the power supply supplies electric power to all components of the audio player.
  • the power supply can be a disposable battery, a rechargeable battery or AC (alternating current) adapter connecting to the AC power supply.
  • a digital circuit of audio decoder and other components of the audio player as shown in the prior art generates noises, and the electromagnetic interference (EMI, or called radio frequency interference RFI) of the digital circuit affects an analog audio circuit, which consequently reduces analog audio quality.
  • EMI electromagnetic interference
  • RFI radio frequency interference
  • Fig. 2 is a block diagram showing an architecture of a high quality digital audio player according to a 1 st embodiment of the present invention.
  • an optical coupler (OC, also called opto-isolator, optocoupler or optical isolator) is introduced to remove an electric connection between the audio decoder and the DAC.
  • An OC is a component that transfers electrical signals between two isolated circuits by using light.
  • a common type of OC consists of a light emitter and a photosensor in the same opaque package. The light emitter converts electrical input signal into light signal, and the photosensor detects incoming light and generates electrical signal.
  • Other types of source-sensor combinations include LED-photodiode, LED-LASCR, and lamp-photoresistor pairs.
  • opto-isolators transfer digital (on-off) signals, but some techniques allow them to be used with analog signals.
  • the power of OC is supplied by the power supply.
  • the light emitter which is connected to the audio decoder, receives digital audio signal (which is electrical signal) from the audio decoder, converts the digital audio signal in electrical form into light signal, and transmits the light signal in a closed optical channel (also called dielectrical channel).
  • the photosensor which is connected to the DAC, detects the incoming light signal, generates the electronical signal and transmits the electronical signal to the DAC.
  • FIG. 3 is a block diagram showing an architecture of a high quality digital audio player according to a 2 nd embodiment of the present invention.
  • a 2 nd power supply is added to supply power to a digital circuit, i.e. audio decoder, and the 1 st power supply supplies power to analog circuits, i.e. OC, DAC and PA.
  • the 1 st power supply is electrically connected to a main power or is a disposable battery
  • 2 nd power supply is a disposable battery.
  • Fig. 4 is a block diagram showing an architecture of a high quality digital audio player according to a 3 rd embodiment of the present invention.
  • both the 1 st power supply and 2 nd power supply are rechargeable batteries.
  • a switch which is electrically connected to a main power, is operated to supply power of the main power to the power supply of low power.
  • the 1 st power supply is a rechargeable battery and the 2 nd power supply is an AC adapter connecting to an AC power supply. If detecting the power level of the 1 st power supply is low, the 2 nd power supply is also operated to (e.g. by a switch) charge the 1 st power supply in addition to supply of power to the audio decoder.
  • Fig. 5 is a block diagram showing an architecture of a high quality digital audio player according to a 4 rd embodiment of the present invention.
  • an electromagnetic shield is applied to cover the analog circuit, the 1 st power supply, and the switch so as to screen EMI impact as much as possible.
  • the electromagnetic shield is applied to the analog circuit only as in the figures 2 and 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

La présente invention porte sur un dispositif de lecture multimédia numérique qui comporte une mémoire destinée à mémoriser un fichier multimédia ; un décodeur audio destiné à générer un signal numérique pour audio à partir du fichier multimédia ; un convertisseur numérique-analogique destiné à convertir un signal numérique pour audio en signal analogique et à fournir le signal analogique à un amplificateur de puissance, l'amplificateur de puissance étant destiné à amplifier le signal analogique ; un coupleur optique étant ajouté entre le décodeur audio et le convertisseur analogique-numérique, le coupleur optique transmettant le signal numérique pour une sortie audio du décodeur audio au convertisseur numérique-analogique à l'aide d'un signal lumineux.
PCT/CN2014/081126 2014-06-30 2014-06-30 Dispositif de lecture multimédia numérique Ceased WO2016000117A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/081126 WO2016000117A1 (fr) 2014-06-30 2014-06-30 Dispositif de lecture multimédia numérique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/081126 WO2016000117A1 (fr) 2014-06-30 2014-06-30 Dispositif de lecture multimédia numérique

Publications (1)

Publication Number Publication Date
WO2016000117A1 true WO2016000117A1 (fr) 2016-01-07

Family

ID=55018215

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2014/081126 Ceased WO2016000117A1 (fr) 2014-06-30 2014-06-30 Dispositif de lecture multimédia numérique

Country Status (1)

Country Link
WO (1) WO2016000117A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6376851B1 (en) * 1998-09-21 2002-04-23 Eugene Robert Worley Opto-coupler applications suitable for low efficiency silicon based LEDs
US20070030661A1 (en) * 2005-08-08 2007-02-08 Rf Micro Devices, Inc. Conformal electromagnetic interference shield
CN101393766A (zh) * 2007-09-21 2009-03-25 联发科技股份有限公司 音频系统以及音频处理方法
CN101582276A (zh) * 2009-05-19 2009-11-18 段锐 一种高清播放机
CN201655328U (zh) * 2010-04-27 2010-11-24 上海第二工业大学 一种具有移动存储功能的音频播放器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6376851B1 (en) * 1998-09-21 2002-04-23 Eugene Robert Worley Opto-coupler applications suitable for low efficiency silicon based LEDs
US20070030661A1 (en) * 2005-08-08 2007-02-08 Rf Micro Devices, Inc. Conformal electromagnetic interference shield
CN101393766A (zh) * 2007-09-21 2009-03-25 联发科技股份有限公司 音频系统以及音频处理方法
CN101582276A (zh) * 2009-05-19 2009-11-18 段锐 一种高清播放机
CN201655328U (zh) * 2010-04-27 2010-11-24 上海第二工业大学 一种具有移动存储功能的音频播放器

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