EP3494465A1 - Audio decoding and reading system - Google Patents
Audio decoding and reading systemInfo
- Publication number
- EP3494465A1 EP3494465A1 EP17745427.9A EP17745427A EP3494465A1 EP 3494465 A1 EP3494465 A1 EP 3494465A1 EP 17745427 A EP17745427 A EP 17745427A EP 3494465 A1 EP3494465 A1 EP 3494465A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- digital
- audio stream
- module
- digital audio
- high fidelity
- 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.)
- Withdrawn
Links
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- 238000005070 sampling Methods 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 241000282693 Cercopithecidae Species 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 description 6
- 238000012432 intermediate storage Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
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- 230000005236 sound signal Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/2368—Multiplexing of audio and video streams
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/16—Sound input; Sound output
- G06F3/162—Interface to dedicated audio devices, e.g. audio drivers, interface to CODECs
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/16—Vocoder architecture
- G10L19/167—Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/16—Storage of analogue signals in digital stores using an arrangement comprising analogue/digital [A/D] converters, digital memories and digital/analogue [D/A] converters
-
- 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
- G11B2020/10537—Audio or video recording
- G11B2020/10546—Audio or video recording specifically adapted for audio data
Definitions
- the present invention relates to a system for decoding and audio playback.
- Such a system usually comprises:
- a computer module which is adapted to: receive audio files from an external source or play audio files on a recording medium which is connected to this computer module, the audio files being coded in accordance with a file format, said computer processing format, which is adapted to apply computer processing thereto, and to perform operations on data contained in these audio files, producing at least one digital audio stream which conforms to a digital audio stream format, from at least one audio file that is received or read in the computer processing format, and receive usage commands that are inputted through a user interface, and that determine system settings or steps of a system operation sequence; and
- a high fidelity module which comprises a digital-to-analog converter and which is adapted to produce an analog sound transmission signal from the digital audio stream, and this high fidelity module is furthermore adapted to execute some of the usage commands.
- the computer module may actually be a microcomputer that controls the high fidelity module.
- the digital audio stream is transmitted by the computer module to the high fidelity module either by a synchronous link, or by an asynchronous link to packet transmission of small data.
- a synchronous link that is used in this way may be in accordance with one S / PDIF, I2S, AES / EBU standards, for example, but in general, a synchronous link presents flow fluctuations for the data stream that is transmitted.
- These flow fluctuations, called “jitter” in English may result from fluctuations in the clock rate of the computer module, but also from fluctuations of a reference voltage that is used to detect changes in values in the data that are transmitted. Indeed, such a reference voltage is obtained from a supply voltage, which may itself fluctuate as a function of random power demand, especially when several consumer modules of electrical energy are supplied in parallel with one another. same power supply unit.
- Another cause of degradation of the acoustic quality that is perceived by the user is the existence of electromagnetic interference that is sensed by the transmission link between the computer module and the high fidelity module. This phenomenon is commonly called antenna effect, and can also occur within the high fidelity module or downstream from it.
- circuits that reduce the fluctuations of the transmission rate of a stream and the antenna effects just described. Such circuits are to be incorporated in the high fidelity module of a decoding and audio playback system, between the transmission link of the stream digital audio from the computer module and the digital to analog converter. But such additional circuits are complex and expensive. In addition, they cause additional consumption of electrical energy, and are therefore likely to cause in turn electromagnetic interference and fluctuations in the supply voltage within the high fidelity module.
- an object of the invention is to propose a new architecture of decoding systems and audio playback, which does not have the aforementioned drawbacks.
- the invention aims to improve the acoustic quality that can be provided by a decoding system and audio playback, without significantly increasing its complexity and price.
- the invention provides a decoding and audio playback system which includes a computer module and a high fidelity module as described above, but which further comprises:
- a buffer memory assembly which is arranged to store at least one segment of the digital audio stream that is produced by the computer module;
- a write set which is arranged to receive the digital audio stream produced by the computer module, and to write this digital audio stream into the buffer set, and
- a read set which is arranged to read the digital audio stream in the buffer memory assembly, and to transmit the read digital audio stream to the digital-to-analog converter.
- the read set is further adapted to allow a variable delay between a write of a data of the digital audio stream by the write set in the buffer set, and a subsequent reading of the same data of the digital audio stream in the buffer set, so that an instantaneous bit rate of the reading is independent of an instantaneous bit rate of writing.
- the set of buffer memory that is introduced by the invention thus makes it possible to decouple the playback speed of the digital audio stream to the high fidelity module, the speed at which this digital audio stream has been stored previously in the buffer set.
- variations in the write speed due in particular to the transmission rate fluctuations between the computer module and a write set which is dedicated to the recording in the buffer memory, are absorbed by a length variable of the digital audio stream segment that is contained at each moment in the buffer set.
- the playback speed, in which the digital audio stream is read into the buffer set can then be driven by the high fidelity module without being subject to the flow fluctuations and electromagnetic interference of the transmission from the computer module.
- the playback speed and the feed rate of the digital-to-analog converter with the digital audio stream can thus have a regularity which is much greater.
- the acoustic emission quality that such a decoding and audio playback system allows is improved accordingly.
- a buffer assembly as used in the present invention is less expensive and less power consuming than circuits for reducing transmission rate fluctuations, and reducing antenna effects.
- the buffer, write, and read sets generate less electromagnetic interference, and also fewer random power calls to a power supply unit.
- the buffer set that is introduced by the invention may be included in the high fidelity module, but not necessarily.
- it can constitute a separate additional module, which is intermediate between a transmission link of the digital audio stream from the computer module, and an input of the high fidelity module.
- the user interface which is used to enter the commands for use of the decoding system and audio playback does not not necessarily part of the system itself. Indeed, it may be an external interface, including a multi-purpose interface, such as a universal remote control or input terminal that is connected by transmission network to the decoding system and audio playback. In particular, it can be a touch pad, connected by wifi or Bluetooth to the decoding system and audio playback.
- the audio decoding and playback system of the invention can be further adapted so that the instantaneous bit rate of the playback of the digital audio stream in the buffer set is internally controlled by the high module. -fidelity, according to the power supply criteria of the digital-to-analog converter with this digital audio stream, or criteria relating to the sound emission.
- the format of the digital audio stream, as written and then read in the buffer set may be that used by the digital-to-analog converter within the high fidelity module to effect the conversion of the digital format. in analog format, to produce the analog sound emission signal.
- the buffer assembly may be of the circular memory type.
- the buffer assembly may have sufficient capacity to store a digital audio stream segment that corresponds to a sound emission duration greater than 1 second, preferably greater than 5 seconds, or even greater than 10 seconds.
- the format of computer processing of the audio files can be one of the following: WAV, AIFF, FLAC, WavPack, Apple Lossless, AAC, MP3, Ogg Vorbis, WMA, Monkey Audio APE, DTS including its successive versions, Dolby Digital or AC-3 including its successive versions such as Dolby TrueHD, Dolby Atmos, DTS: X, MQA, DSF, DSDIFF, SACD, and DVD Audio.
- the buffer assembly and the digital-to-analog converter may be independent of a first circuit board.
- an output of the computer module is connected to an input of the writing assembly by a transmission link of the digital audio stream.
- the system then also comprises means for transmitting at least part of the usage commands to the high fidelity module.
- the buffer assembly and the digital-to-analog converter may be formed at least in part on a second electronic circuit board which is separate from the first electronic circuit board, and which is common to the buffer set and digital-to-analog converter.
- the buffer assembly and the digital-to-analog converter may be contained in an electromagnetic shielding housing. .
- the computer module is then located outside of this housing.
- the system may further comprise at least one power supply unit which is dedicated to the reading assembly and to the digital-to-analog converter, being isolated from the computer module and another power supply unit which is dedicated to this computer module.
- the high fidelity module can be further adapted to transmit to the computer module at least one of information on a state of progress of a digital audio stream processing by this high-fidelity module, an acknowledgment message for an audio sampling frequency change, a message for acknowledgment of an audio sampling depth change, an acknowledgment-reception message of a modulation format change or a coding format change of the digital audio stream, a message indicative of a space that is available in the buffer set for writing a sequence of the digital stream audio, a message of acknowledgment-receipt of a command of use, and information on a state of execution of a command of use.
- the audio decoding and playback system of the invention can be coupled to a decoding and video playback system.
- the high fidelity module is then adapted to transmit in particular to the computer module the information on the state of progress of the processing of the digital audio stream by the high fidelity module. Then, at least one of the audio decoding and playback system and the video decoding and playback system can be adapted to adjust a synchronization between the sound emission that is produced from the analog sound emission signal, and images that are displayed from video display data produced by the decoding and video playback system.
- FIG. 1 is a general diagram of a decoding system and audio playback according to the invention.
- References 1 and 2 respectively denote the computer module and the high fidelity module.
- the modules 1 and 2 are supplied with electrical energy from two separate power supply units, denoted ALIM. : the unit 1 1 for the computer module 1 and the unit 21 for the high fidelity module 2.
- ALIM two separate power supply units
- the modules 1 and 2 are each made on a circuit board (s) (s) ) electronic (s) which is (are) separated from that (s) of the other module, each of the modules 1 and 2 can be enclosed in an insulation box against parasitic electromagnetic radiation which is dedicated to this module.
- the computer module 1 can be housed inside a housing 10
- the high fidelity module 2 can be housed inside a separate housing 20.
- the computer module 1 can receive audio files that are encoded in a computer processing format, from several sources such as a local recording medium or remote sources that are connected to the computer module by a transmission network.
- the format of the audio files that are thus received or read by the computer unit 1 can be WAV, AIFF, FLAC, WavPack, Apple Lossless, AAC, MP3, Ogg Vorbis, WMA, Monkey Audio APE, DTS including its successive versions, Dolby Digital or AC-3 including its successive versions such as Dolby TrueHD, Dolby Atmos, DTS: X, MQA, DSF, DSDIFF, SACD, and DVD Audio in a non-limiting way, and was called format of computer processing of files audio in the general part of this description.
- the computer module 1 applies to this (s) audio file (s) treatments that are known to those skilled in the art, in order to produce a digital audio stream that corresponds, in digital form, to the sound signal to be produced.
- These processing operations that are performed by the computer module 1 can include in particular a conversion of the sampling frequency of the sound emission signal, called the audio sampling frequency, and / or a conversion of the depth of this sampling, or even of the format modulation of the digital audio stream.
- the sampling depth is the number of bits that constitute the scale of digitization of the amplitude of the sound emission signal.
- Other treatments that can also be executed by the computer module 1, on the audio file (s) in the computer processing format or on the digital audio stream are for example acoustic correction filters as applied. by equalizers, convolution filtering and the like for improving the sound emission signal as perceived by a listener, taking into account potentially the impact of the downstream reproduction system, including the amplifier and the loudspeakers, as well as the acoustics of the listening room.
- the computer module 1 receives commands from a user, called user commands, which relate to the operation that is desired for the system: commands for starting, stopping, of standby, commands of selection of music tracks, change of playback position, sound power adjustment controls, etc.
- user commands can be entered by the user via a user interface, which can be dedicated to the audio decoding and playback system, such as a keyboard or input board, or be a multi-purpose input terminal. , like a tablet computer.
- Some of these usage commands may be for computer module 1, such as music selection or programming commands, while other usage commands may be for the high fidelity module 2, such as for example, controls for adjusting the sound power. Still other commands may relate to both computer modules 1 and high fidelity 2.
- the high fidelity module 2 also known as the hifi module, comprises a digital-to-analog converter 22, denoted CNA, which converts the digital audio stream into an analogue sound transmission signal. This analog sound emission signal is then sent to an amplifier and then to one or more loudspeakers to produce the sound emission.
- the high fidelity module 2 may comprise several audio channels in parallel (several distinct channels in the case of a stereophonic channel, bass channel ...), each channel having its own digital converter -analog.
- an intermediate storage unit 3 is inserted on the transmission path of the digital audio stream between the computer module 1 and the digital-analog converter 22. Possibly but not necessarily, this intermediate storage unit 3 may be included in the high fidelity module 2. It has as input a writing assembly 3a, which is intended to register the digital audio stream in a buffer memory assembly 3b, as this stream is transmitted by the unit 1 simultaneously via the transmission link 4. Simultaneously, the intermediate storage unit 3 comprises a read set 3c, which is intended to read the digital audio stream in the buffer memory 3b, as it flux is processed by the digital-to-analog converter 22.
- the high fidelity module 2 can control the conversion rate of the digital audio stream into an emitted analog signal.
- This digital audio stream segment has an instantaneous length which is free, or with the minimum of constraints so that it varies essentially according to the instantaneous speed of reception of the stream coming from the computer unit 1, and the speed instant of processing of the same stream by the digital-to-analog converter 22.
- the instantaneous speed of reception of the digital audio stream coming from the computer unit 1 has very little influence, or no influence on the speed
- This latter speed can then be controlled by the high fidelity unit 2 according to a nominal bit rate of the digital-to-analog converter 22, or to reproduce a nominal speed of sound emission.
- the capacity of the buffer assembly 3b is preferably sufficient to contain accumulations of gaps between the instantaneous speeds of writing and reading that could occur on whole pieces of music.
- the capacity of the buffer assembly 3b can be sized to contain 1 second, or even 5 or 10 seconds of musical piece.
- the intermediate storage unit 3 may comprise one or more modules each of circular memory type.
- the buffer memory assembly 3b may comprise two independent memory blocks which are used alternately, one exclusively for writing, the other exclusively for reading, and then the two uses for writing and reading are exchanged between the two blocks of memory. memory, and this repeatedly or periodically during a whole sequence of decoding and reading the same piece of sound emission.
- the write set 3a may comprise one or more write units
- the read set 3c may include one or more read units.
- the digital audio stream can be written and read in the buffer set 3b, by the write set 3a and by the read set 3c respectively, in the form of successive blocks which can have any lengths.
- the reference 5 which is indicated in the figure denotes a bidirectional transmission of operating data between the computer module 1 and the high fidelity module 2.
- these data of Operation includes, in particular, the usage commands already mentioned above, and information messages about changes in sampling frequency, changes in sampling depth and / or modulation format that are applied to the digital audio stream.
- the operating data that is transmitted may include information on a state of progress of the processing of the digital audio stream by the high fidelity module 2, or more specifically by the converter 22, acknowledgment messages of changes in the sampling frequency, the sampling depth and / or the modulation format which have been previously indicated by the computer module 1 to the high fidelity module 2, messages indicative of the space which is available in the buffer memory assembly 3b, for controlling possibly adjusting the transmission speed of the rest of the digital audio stream by the transmission link 4, messages for acknowledgment of receipt of usage commands which have been previously transmitted by the computer module 1 to the high fidelity module 2, information on an execution state of a usage command, etc.
- the decoding system and audio playback may be the audio part of a device for decoding and playback audio and video.
- a mixed device therefore also comprises a video processing and display chain, commonly called a video channel.
- a video channel itself comprises a decoding system and video playback to power a display system with a stream of images to be displayed successively.
- Part of the computer module 1 can then be shared with the video channel, in particular for the reception functions of the audio / video files and reception of the usage commands. So the transmission 5 can also be used to transmit messages or synchronization beacons in both directions to control the progress of sound transmission and the video display relative to each other.
- the invention can be reproduced by modifying secondary aspects of the embodiment which has just been described in detail.
- the separations of the computer and high fidelity modules on separate electronic circuit boards, and / or in separate housings, and / or with separate power supply units are advantageous but optional improvements.
- the reading assembly and the digital-to-analog converter can be powered by two separate power supply units.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Multimedia (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Health & Medical Sciences (AREA)
- Human Computer Interaction (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Computational Linguistics (AREA)
- Acoustics & Sound (AREA)
- General Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1657555A FR3054944B1 (en) | 2016-08-04 | 2016-08-04 | AUDIO DECODING AND READING SYSTEM |
PCT/FR2017/051834 WO2018024953A1 (en) | 2016-08-04 | 2017-07-05 | Audio decoding and reading system |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3494465A1 true EP3494465A1 (en) | 2019-06-12 |
Family
ID=57233657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17745427.9A Withdrawn EP3494465A1 (en) | 2016-08-04 | 2017-07-05 | Audio decoding and reading system |
Country Status (5)
Country | Link |
---|---|
US (1) | US10728592B2 (en) |
EP (1) | EP3494465A1 (en) |
JP (1) | JP2019529967A (en) |
FR (1) | FR3054944B1 (en) |
WO (1) | WO2018024953A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102152334B1 (en) * | 2018-07-31 | 2020-09-04 | 네이버 주식회사 | Method and system for filtering sound source |
JP7383402B2 (en) * | 2019-05-29 | 2023-11-20 | オンキヨーテクノロジー株式会社 | playback device |
US11785285B1 (en) * | 2022-05-20 | 2023-10-10 | Lenbrook Industries Limited | Audio video receiver (AVR) architecture |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6920526B1 (en) * | 2000-07-20 | 2005-07-19 | Silicon Graphics, Inc. | Dual-bank FIFO for synchronization of read data in DDR SDRAM |
JP2004102647A (en) * | 2002-09-10 | 2004-04-02 | Sony Corp | Recording device and method, reproducing device and method, recording medium and program |
KR101535827B1 (en) * | 2008-12-05 | 2015-07-27 | 삼성전자주식회사 | Apparatus and method for audio and video synchronization in wireless communication network |
FR3034220B1 (en) * | 2015-03-27 | 2017-03-10 | Damien Plisson | IMPROVED MULTIMEDIA FLOW TRANSMISSION |
-
2016
- 2016-08-04 FR FR1657555A patent/FR3054944B1/en active Active
-
2017
- 2017-07-05 WO PCT/FR2017/051834 patent/WO2018024953A1/en unknown
- 2017-07-05 EP EP17745427.9A patent/EP3494465A1/en not_active Withdrawn
- 2017-07-05 JP JP2019505370A patent/JP2019529967A/en active Pending
- 2017-07-05 US US16/321,272 patent/US10728592B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
FR3054944B1 (en) | 2018-07-20 |
US20190174154A1 (en) | 2019-06-06 |
FR3054944A1 (en) | 2018-02-09 |
US10728592B2 (en) | 2020-07-28 |
WO2018024953A1 (en) | 2018-02-08 |
JP2019529967A (en) | 2019-10-17 |
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