EP4018674A1 - Remote sound reproduction system comprising a digital audio broadcaster connected to a digital audio receiver by at least two wireless links - Google Patents
Remote sound reproduction system comprising a digital audio broadcaster connected to a digital audio receiver by at least two wireless linksInfo
- Publication number
- EP4018674A1 EP4018674A1 EP20753776.2A EP20753776A EP4018674A1 EP 4018674 A1 EP4018674 A1 EP 4018674A1 EP 20753776 A EP20753776 A EP 20753776A EP 4018674 A1 EP4018674 A1 EP 4018674A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- digital audio
- wireless link
- frames
- frame
- receiver
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 claims description 29
- 230000005540 biological transmission Effects 0.000 claims description 23
- 230000007704 transition Effects 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 8
- 238000012795 verification Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 3
- 230000005236 sound signal Effects 0.000 description 17
- 230000001360 synchronised effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
-
- 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
- H04N21/233—Processing of audio elementary streams
-
- 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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4341—Demultiplexing of audio and video streams
-
- 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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
-
- 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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
-
- 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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
Definitions
- TITLE DEPORTED SOUND RESTITUTION SYSTEM INCLUDING A DIGITAL AUDIO DIFFUSER CONNECTED TO ONE DIGITAL AUDIO RECEIVER BY AT LEAST TWO
- the technical field of the invention is that of systems comprising a digital audio broadcaster and at least one digital audio receiver connected wirelessly and more particularly multimedia systems comprising a digital audio broadcaster and at least one digital audio receiver connected wirelessly for sound reproduction deported.
- the present invention relates to a system for the remote reproduction of digital audio data comprising a digital audio broadcaster and at least one digital audio receiver connected wirelessly.
- the present invention also relates to a digital audio receiver, a digital audio broadcaster, a method for remote reproduction of digital audio data, a computer program product and a recording medium.
- connection used between the decoder and the speaker is a wireless connection of the Wi-Fi or Bluetooth type.
- these types of connections are commonly subject to transmission disturbances that can last for several seconds, in particular caused by simultaneous transmissions made by other equipment operating on frequency bands similar to those used by the connection.
- a buffer memory lasting at least one second.
- a buffer memory of such a duration is incompatible with the need for synchronization between the decoder and the enclosure applying in particular to the case where the image of a video is broadcast by a screen connected to the decoder and the sound of the video is deported to the enclosure.
- the latency time must be less than 100 milliseconds.
- this latency can be of the order of 1 to 3 seconds because of this long buffer memory.
- the invention offers a solution to the problems mentioned above, by proposing a system comprising a first device for the reproduction of digital audio data transmitted by a second device, the reproduction of the sound being performed without latency and not being subject to interference .
- a first aspect of the invention relates to a system for the deported reproduction of digital audio data comprising at least one digital audio receiver and a digital audio broadcaster, the digital audio broadcaster being configured to transmit the digital audio data in the form of frames to the digital audio receiver, the receiver digital audio being configured to output the digital audio data from the frames, the digital audio broadcaster and the digital audio receiver being connected via at least a first and a second wireless link and the digital audio broadcaster simultaneously transmitting a first set of frames via the first wireless link and a second set of frames via the second wireless link.
- the presence of at least two wireless links between the digital audio broadcaster and the digital audio receiver improves the robustness of the system to interference since, if one of the wireless links is subject to interference while the other is not, this other wireless link makes it possible to obtain the necessary frames despite everything.
- the system then allows the synchronized reproduction of digital audio data with a possible video output.
- the system according to a first aspect of the invention can have one or more additional characteristics among the following, considered individually or according to any technically possible combination.
- the first and the second set of frames have different characteristics.
- the characteristics of the frames transmitted via each of the wireless links adapt to the type of link on which the frames are transmitted.
- the first wireless link and the second wireless link use different frequency bands.
- the first and the second wireless link are Wi-Fi links.
- the same frames can be transmitted via the first and the second link with the same transmission parameters and according to a single clock, that is to say that the first and second set of frames are the same.
- Wi-Fi links have a greater bandwidth than Bluetooth links, which allows better sound transmission.
- the first wireless link is a Wi-Fi 2.4 GFIz link and the second wireless link is a Wi-Fi 5 GFIz link.
- the first wireless link is a Wi-Fi link and the second wireless link is a Bluetooth link.
- a second aspect of the invention relates to a process for the remote reproduction of digital audio data implemented by the system according to a first aspect of the invention, the digital audio data being transmitted in the form of frames, each frame being associated with a presentation time, comprising the following steps:
- the step of verifying the reception of the frame comprises a first sub-step of verifying the reception of the frame via the first wireless link and, if during a previous step verification of receipt of said frame the frame had not been received via the first link without wire, a second sub-step of checking the reception of the frame via the second wireless link.
- the first wireless link has priority and during the first transmission of the frame, only the reception via the priority link is verified. If the frame is not received via the priority link during the first transmission, reception via the second link is then verified.
- the step of verifying the reception of the frame comprises a sub-step of verifying the reception of the frame via the first wireless link and the reception of the frame via the second wireless link.
- the first and second wireless links have equal priority.
- the step of decoding and restitution is performed for the frame received first among the first frame received via the first wireless link and the second frame received via the second wireless link.
- a third aspect of the invention relates to a digital audio broadcaster, connected to a digital audio receiver via at least a first and a second wireless link and configured to transmit digital audio data in the form of frames to the digital audio receiver by carrying out a simultaneous transmission. a first set of frames via the first wireless link and a second set of frames via the second wireless link.
- a fourth aspect of the invention relates to a digital audio receiver, connected to a digital audio broadcaster via at least a first and a second wireless link and configured to receive digital audio data in the form of frames via the first and / or the second wireless link and for decoding the received frames and restoring the digital audio data from the decoded frames.
- a fifth aspect of the invention relates to a computer program product comprising instructions which, when the program is executed by a computer, lead the latter to implement the method according to a second aspect of the invention.
- a sixth aspect of the invention relates to a computer readable recording medium comprising instructions which, when executed by a computer, lead the latter to implement the method according to a second aspect of the invention.
- Figure 1 shows a schematic representation of a system according to a first aspect of the invention.
- Figure 2 shows a block diagram of a method according to a second aspect of the invention.
- Figure 3a shows samples of a digital audio signal.
- Figure 3b shows samples of the digital audio signal of Figure 3a, encoded according to two different sets of encoding parameters.
- Figure 4a shows samples from a first digital audio signal progressively adjusted to zero, obtained from the digital audio signal of Figure 3a.
- Figure 4b shows samples from a second digital audio signal gradually adjusted from zero, obtained from the digital audio signal of Figure 3a.
- a first aspect of the invention relates to a system allowing a deported reproduction of digital audio data.
- production of digital audio data means the sound playback of each digital audio data.
- remote reproduction of digital audio data is understood to mean the reproduction of digital data by a device other than the device which comprises a user interface which has enabled a user to request the restoration of the digital audio data.
- Figure 1 shows a schematic representation of a system 100 according to a first aspect of the invention.
- the system 100 includes a digital audio broadcaster 101.
- the digital audio broadcaster 101 is a digital audio decoder which optionally also acts as an audiovisual decoder and is connected to means 106 for reproducing the image of a video.
- the digital audio broadcaster 101 can also be a stationary computer connected or not to a computer screen or to a video projector, a laptop computer, a video game console connected or not to a television screen, a smart television or even a smartphone.
- the system 100 also includes at least one digital audio receiver 102.
- the system 100 comprises a single digital audio receiver 102.
- the digital audio receiver 102 is a wireless amplifier to which a speaker 105 is connected.
- the digital audio receiver 102 and the speaker 105 can be combined into a single device, such as a wireless receiving speaker.
- the system 100 can also include a plurality of digital audio receivers 102, for example a speaker system.
- the digital audio broadcaster 101 and the digital audio receiver 102 are connected via at least a first wireless link 103 and a second wireless link 104.
- the system has only two wireless links 103, 104.
- the digital audio broadcaster 101 is configured to transmit digital audio data in the form of frames to the digital audio receiver 102.
- a frame includes at least digital audio data and is associated with a presentation time.
- the presentation time can be transmitted in the frame, or outside the frame by means of a clock signal transmitted between the digital audio broadcaster 101 and the digital audio receiver 102.
- a frame is for example a frame comprising uncompressed data, for example a coded pulse modulation frame or PCM for "Puise Code Modulation", or a frame comprising lossless compressed data, for example a frame in FLAC format for “Free Lossless Audio Coded”, or even a frame comprising lossy compressed data, for example a frame in MPEG-4 AAC format for “Advanced Audio Coding” or Opus.
- the digital audio broadcaster 101 is configured to simultaneously transmit a first set of frames via the first wireless link 103 and a second set of frames via the second wireless link 104.
- the digital audio receiver 102 is configured to receive the frames transmitted by the digital audio broadcaster 101 via the first wireless link 103 and / or the second wireless link 104, to decode the received frames and to restore the digital audio data of the decoded frames .
- the clock of the digital audio broadcaster 101 is synchronized with the clock of the digital audio receiver 102.
- the clock of the digital audio receiver 102 is synchronized with the clock of the video reproduction means 106, via the digital audio broadcaster 101.
- the first wireless link 103 and the second wireless link 104 are Wi-Fi links.
- the first wireless link 103 uses a frequency band different from that used by the second wireless link 103.
- the first wireless link 103 is for example a Wi-Fi link using the 2.4 GFIz frequency band and the second wireless link 104 is for example a Wi-Fi link using the 5 GFIz frequency band.
- the first wireless link 103 and the second wireless link 104 operate on the same frequency bands.
- the first wireless link 103 is for example a Wi-Fi link using the 2.4 GHz frequency band and the second wireless link 104 is for example a Wi-Fi link also using the 2.4 GHz frequency band.
- the transmission via the first wireless link 103 and the transmission via the second wireless link 104 can be performed with the same transmission parameters and according to the same clock, that is that is, the first set of frames transmitted via the first wireless link 103 is identical to the second set of frames transmitted via the second wireless link 104.
- the transmission parameters are digital audio parameters, such as for example the number of channels, the sampling frequency, the compression rate or the type of coding.
- the transmission via the first wireless link 103 and the transmission via the second wireless link 104 can also be performed with different transmission parameters, that is to say that the first set of frames transmitted via the first wireless link 103 is different from the second set of frames transmitted via the second wireless link 104.
- the first wireless link 103 is a Wi-Fi link and the second wireless link 104 is a Bluetooth link.
- the transmission via the first wireless link 103 and the transmission via the second wireless link 104 are performed with different transmission parameters and according to different clocks, that is, that is, the first set of frames transmitted via the first wireless link 103 is different from the second set of frames transmitted via the second wireless link 104.
- the first wireless link 103 is for example a Wi-Fi link using the 2.4 GHz frequency band and the second wireless link 104 is a Bluetooth link using the 2.4 GHz frequency band.
- the Bluetooth link is for example an AD2P Bluetooth link for “Advanced Audio Distribution Profile”.
- the first wireless link 103 and / or the second wireless link 104 can also be Wi-Fi Direct links.
- a second aspect of the invention relates to a method for the remote reproduction of digital audio data implemented by the system 100 according to a first aspect of the invention.
- Figure 2 shows a block diagram showing the sequence of steps 201 to 204 of method 200 according to a second aspect of the invention.
- the method 200 according to a second aspect of the invention is carried out for each frame comprising the digital audio data to be restored.
- the first step 201 of the method 200 consists in the transmission of a first frame via the first wireless link 103 and of a second frame via the second wireless link 204 by the digital audio broadcaster 101 to the digital audio receiver 102, the first frame and the second frame possibly being identical or different depending on the type of the first 103 and second wireless link 104, and / or depending on the chosen digital audio parameters.
- the second step 202 then consists in verifying the reception of the frame by the digital audio receiver 102.
- the verification is performed only on one of the two wireless links, namely on the first wireless link 103 or on the second wireless link 104, which is considered to be priority.
- the verification is carried out on the wireless link having the best quality of sound transmission or the one least subject to interference.
- the verification is performed on the first wireless link 103 and on the second wireless link 104.
- the rest of the method 200 applies only to the frame received first of the first frame and the second frame received respectively via the first wireless link 103 and the second wireless link 104.
- a first condition C1 is met, namely if the frame has been received by the digital audio receiver 102 via the first wireless link 103 and / or the second wireless link 104, the third step 203 of the method 200 is performed .
- the third step 203 of the method 200 consists in decoding the frame, then in restoring the digital audio data included in the frame at the time of presentation of the frame, the third step 203 of the method 200 being carried out by the digital audio receiver 102 .
- the method 200 is carried out for the following frame.
- the fourth step 204 of the method 200 consists in sending, by the digital audio receiver 102, a request for retransmission of the frame to the digital audio broadcaster 101.
- the number of retransmission requests is minimized and the decoding of the digital audio frame is performed more quickly since the second step 202 of checking the reception is always performed on the first link without wire 103 and on the second wireless link 104.
- the transmission and / or retransmission of digital audio frames is for example carried out according to the RTP protocol for "Real-time Transport Protocol" when the link is of the Wi-Fi type, and according to the A2DP protocol for "Advanced Audio Distribution profile. »When the connection is of Bluetooth type.
- the method 200 is carried out for the following frame.
- the digital audio parameters such as for example the number of channels, the sampling frequency, the type of coding used or the compression rate, can be different between the first wireless link 103 and the second wireless link 104.
- the alternating restitution between the digital audio data from the first wireless link 103 and the digital audio data from the second wireless link 104 can pose quality problems.
- the lengths of the frames may be different depending on the type of encoding used. For example, encoding in MP3 format uses frames of 1152 samples, while encoding in AAC format uses frames of 1024 samples.
- the frame borders are not necessarily identical because they are not aligned according to the digital audio parameters chosen.
- Another problem is that digital audio compression changes the shape of the audio signal.
- FIG. 3a Figure 3a shows samples of a digital audio signal.
- Figure 3b shows samples of the digital audio signal of Figure 3a, encoded according to two different sets of encoding parameters.
- FIG. 3a represents samples of a digital audio signal before encoding.
- the digital audio receiver 102 when it comes to passing from the reproduction of a first signal, having a first set of digital audio parameters, to the reproduction of a second signal, having a second set of digital audio parameters, to apply a gradual transition between the first signal and the second signal.
- Figure 4a shows samples from a first digital audio signal progressively adjusted to zero, obtained from the digital audio signal of Figure 3a.
- Figure 4b shows samples from a second digital audio signal progressively adjusted from zero, obtained from the digital audio signal of Figure 3a.
- the amplitude of the samples of the first signal is gradually reduced, by multiplying, that is to say by applying a first weighting to each sample by coefficients progressively ranging from one to zero.
- the amplitude of the samples of the second signal is gradually increased, by multiplying, that is, by applying a second weighting to each sample by coefficients progressively ranging from zero to one.
- the sum of the first weighting and of the second weighting is equal to 1, in order to preserve the overall level of the signal around the transition point.
- the digital audio receiver 102 can also use the frame N resulting from the second signal, if this is available, in order to increase the number of samples overlapping around the transition point.
- the digital audio receiver 102 will transform, after decoding, the first signal and / or the second signal, in order to bring the first signal and the second signal to an identical representation in number of channels and in sampling frequency.
- the invention finds a particularly interesting application in the case where the digital audio broadcaster 101 broadcasts the images of a video and the sound of the video is deported to the digital audio receiver 102, thus allowing the synchronized reproduction of the image. and the sound of the video.
- a particular advantage of the invention is to allow reduced latency, allowing navigation in a user interface displayed on the video reproduction means 106 with a response time perceived by the user as being instantaneous .
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Television Systems (AREA)
- Circuit For Audible Band Transducer (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1909354A FR3100096B1 (en) | 2019-08-22 | 2019-08-22 | DEPORTED SOUND RESTITUTION SYSTEM COMPRISING A DIGITAL AUDIO DISTRIBUTOR CONNECTED TO AN AUDIONUMIC RECEIVER BY AT LEAST TWO WIRELESS LINKS |
PCT/EP2020/072855 WO2021032617A1 (en) | 2019-08-22 | 2020-08-14 | Remote sound reproduction system comprising a digital audio broadcaster connected to a digital audio receiver by at least two wireless links |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4018674A1 true EP4018674A1 (en) | 2022-06-29 |
Family
ID=68987899
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20753776.2A Pending EP4018674A1 (en) | 2019-08-22 | 2020-08-14 | Remote sound reproduction system comprising a digital audio broadcaster connected to a digital audio receiver by at least two wireless links |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4018674A1 (en) |
FR (1) | FR3100096B1 (en) |
WO (1) | WO2021032617A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7707303B2 (en) * | 2002-09-06 | 2010-04-27 | Telefonaktiebolaget L M Ericsson (Publ) | Method and devices for controlling retransmissions in data streaming |
US20060224763A1 (en) * | 2005-03-18 | 2006-10-05 | Sharp Laboratories Of America, Inc. | Switching and simultaneous usage of 802.11a and 802.11g technologies for video streaming |
KR101556609B1 (en) * | 2008-06-03 | 2015-10-02 | 삼성전자주식회사 | Transmitting apparatus receiving apparatus transmitting system which combines these and method thereof |
US9763120B2 (en) * | 2014-12-24 | 2017-09-12 | EVA Automation, Inc. | Redundant links for reliable communication |
-
2019
- 2019-08-22 FR FR1909354A patent/FR3100096B1/en active Active
-
2020
- 2020-08-14 EP EP20753776.2A patent/EP4018674A1/en active Pending
- 2020-08-14 WO PCT/EP2020/072855 patent/WO2021032617A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR3100096A1 (en) | 2021-02-26 |
WO2021032617A1 (en) | 2021-02-25 |
FR3100096B1 (en) | 2023-07-14 |
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