"Synchronous Wi-Fi": the Alliance is preparing to certify technology TimeSync
At CES 2017, the association of manufacturers of computer equipment and wireless devices Wi-Fi Alliance announced its intention to certify the technology called TimeSync.
Its goal is to solve the problem with the delivery of high-quality audio and video in a multi-station Wi-Fi network so that the final result will be issued without re-synchronizing the sound. When delivering audio in the "point-to-point" format - for example, from a media server to a PC - timing does not cause difficulties. In the case of broadcasting via Wi-Fi, problems may arise - small delays of a few milliseconds.
Photo of Christiaan Colen / CC
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Members of the Wi-Fi Alliance want to make their decision a standard of connection for a wide variety of systems, having struggled with Bluetooth and Zigbee in the market of audio-visual solutions. The implementation of the TimeSync certification project opens up a number of new possibilities for creating ecosystems of wireless speakers.
"Increasing interoperability will lead to the development of an ecosystem and greater choice for users," said Kevin Robinson, vice president of marketing for the Wi-Fi Alliance.
Wi-Fi TimeSync is based on technologies such as the IEEE 802.11 standard. In essence, this is an extension for the MAC Layer Management Entity (MLME) when the requesting party asks the receiver to send a time stamp and receives a response in the ACK frame (image below). Its original purpose was to monitor the status of networks. Now it finds application in the home media ecosystem.
Source: IEEE 11-13 / 0095r0
The concept of the solution is simple: several Wi-Fi devices synchronize their internal clocks and set the value that the master device has at that moment. In this case, the devices take into account the information transmission delays and fix the moment when the frame leaves the transmitting device.
Since this uses the time scale with sub-microsecond accuracy, the sound will be delivered as mastering engineer intended. TimeSync is also able to synchronize the work of several cameras, synchronizing the shooting of individual frames. The protocol also has mechanisms for determining the main device with the “best clocks”, which are performed every time a new device is connected to the system.
High-performance media systems are the most obvious use for TimeSync, however there are others. Kevin believes that the technology will be used in the development of television multimedia consoles, headphones and players. Also, TimeSync can be used to synchronize pictures from the camera and sound from the microphone during recording. Without a doubt, TimeSync has every chance to find application in the market of the Internet of Things.
It is expected that the first chips with TimeSync support will hit the market by mid-2017, and products using them will be released in early 2018.
PS And here are some more interesting materials on a topic from our “Hi-Fi World”:
PPS A fresh release of our podcast - Home theaters: Why we decided to build two cinema halls in the Audimania showroom .
Its goal is to solve the problem with the delivery of high-quality audio and video in a multi-station Wi-Fi network so that the final result will be issued without re-synchronizing the sound. When delivering audio in the "point-to-point" format - for example, from a media server to a PC - timing does not cause difficulties. In the case of broadcasting via Wi-Fi, problems may arise - small delays of a few milliseconds.
Photo of Christiaan Colen / CC')
Members of the Wi-Fi Alliance want to make their decision a standard of connection for a wide variety of systems, having struggled with Bluetooth and Zigbee in the market of audio-visual solutions. The implementation of the TimeSync certification project opens up a number of new possibilities for creating ecosystems of wireless speakers.
"Increasing interoperability will lead to the development of an ecosystem and greater choice for users," said Kevin Robinson, vice president of marketing for the Wi-Fi Alliance.
Wi-Fi TimeSync is based on technologies such as the IEEE 802.11 standard. In essence, this is an extension for the MAC Layer Management Entity (MLME) when the requesting party asks the receiver to send a time stamp and receives a response in the ACK frame (image below). Its original purpose was to monitor the status of networks. Now it finds application in the home media ecosystem.
Source: IEEE 11-13 / 0095r0
The concept of the solution is simple: several Wi-Fi devices synchronize their internal clocks and set the value that the master device has at that moment. In this case, the devices take into account the information transmission delays and fix the moment when the frame leaves the transmitting device.
Since this uses the time scale with sub-microsecond accuracy, the sound will be delivered as mastering engineer intended. TimeSync is also able to synchronize the work of several cameras, synchronizing the shooting of individual frames. The protocol also has mechanisms for determining the main device with the “best clocks”, which are performed every time a new device is connected to the system.
High-performance media systems are the most obvious use for TimeSync, however there are others. Kevin believes that the technology will be used in the development of television multimedia consoles, headphones and players. Also, TimeSync can be used to synchronize pictures from the camera and sound from the microphone during recording. Without a doubt, TimeSync has every chance to find application in the market of the Internet of Things.
It is expected that the first chips with TimeSync support will hit the market by mid-2017, and products using them will be released in early 2018.
PS And here are some more interesting materials on a topic from our “Hi-Fi World”:
- Bluetooth audio: wireless sound characteristics
- Wireless Hi-Fi acoustics Denon HEOS 1
- Sonos Play Review: 5. Music without wires
- Wireless multi-room system Monster StreamCast 3
- OPPO Digital Introduces Sonica Wi-Fi Audio System
- Wireless Hi-Fi acoustics B & W Zeppelin Wireless
- HEOS 5 HS2 Wireless Speaker Test
- Wireless speaker Sonos PLAY: 1
- Electrocompaniet presented at ISE 2016 a new model of wireless speakers
- Wireless Hi-Fi acoustics KitSound Boom Evolution
PPS A fresh release of our podcast - Home theaters: Why we decided to build two cinema halls in the Audimania showroom .
Source: https://habr.com/ru/post/400839/
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