| Electronics > Projects, Designs, and Technical Stuff |
| Digital audio protocol for 100M copper |
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| Ice-Tea:
Allow me to add another vote for ethernet. No need to reinvent the wheel. |
| Jeroen3:
--- Quote from: mc73 on December 10, 2018, 07:02:12 pm ---It's for a chain. There are 30+ stalls per store. PCs are expensive and often unreliable. They sometimes also have terrible latency depending on whats running on them. Customs boards are much cheaper in quantity and we have a lot of experience with building robust electronics specific to this industry, user serviceable parts and supply chain. --- End quote --- If you have to compromise some features to fit a standard fanless box pc for this many unit, I can understand the wish for custom boards. Although, the PC's are not that expensive. For sub 500$ you have one, maybe some discount for quantity, but I guess you can't go that low. --- Quote from: mc73 on December 10, 2018, 06:54:26 pm ---We'd prefer not to use the full ethernet stack. The systems needs to be robust and isolated. --- End quote --- Ethernet (IEEE 802.3) is layer two. The "full stack", with layers 3 and above (TCP/IP) is not mandatory to follow as in "the internet", although useful for off the shelf software/hardware compatibility. You should be able to use ethernet switches for networks that do not follow TCP/IP. I believe there are some Audio over Ethernet products for the entertainment industry, since the cabling is cheap and has a high bandwidth. |
| coppice:
--- Quote from: mariush on December 11, 2018, 08:16:02 am ---I'd say just get a microcontroller/processor powerful enough to encode and decode FLAC or OPUS (open source both) FLAC decoding is as far as I know integer only so it will work even on lower frequency microcontrollers.... if you "optimize" the opus library to encode just mono for example it may also be not that much cpu intensive. --- End quote --- I think the original poster is looking for an interactive solution. FLAC is a disaster for this, as it has massive algorithmic latency. OPUS is specifically designed for low latency applications, and would be a good choice if compression is actually necessary. |
| mariush:
--- Quote from: Jeroen3 on December 11, 2018, 09:37:49 am --- --- Quote from: mc73 on December 10, 2018, 07:02:12 pm ---It's for a chain. There are 30+ stalls per store. PCs are expensive and often unreliable. They sometimes also have terrible latency depending on whats running on them. Customs boards are much cheaper in quantity and we have a lot of experience with building robust electronics specific to this industry, user serviceable parts and supply chain. --- End quote --- If you have to compromise some features to fit a standard fanless box pc for this many unit, I can understand the wish for custom boards. Although, the PC's are not that expensive. For sub 500$ you have one, maybe some discount for quantity, but I guess you can't go that low. --- End quote --- I don't see how computers are expensive... there's boards with soldered cpu like this one for example at 60$: https://www.newegg.com/Product/Product.aspx?Item=N82E16813157730&ignorebbr=1 Add 40$ for 4gb ddr3 and a ssd and you'll only need a psu to power it. but there's such boards with 12v or 18.5v dc in jacks See Asus H110T for example: https://www.amazon.com/H110T-CSM-LGA1151-Mini-ITX-Motherboard/dp/B01EZGYSGG |
| mikeselectricstuff:
--- Quote from: mariush on December 11, 2018, 11:31:00 am --- --- Quote from: Jeroen3 on December 11, 2018, 09:37:49 am --- --- Quote from: mc73 on December 10, 2018, 07:02:12 pm ---It's for a chain. There are 30+ stalls per store. PCs are expensive and often unreliable. They sometimes also have terrible latency depending on whats running on them. Customs boards are much cheaper in quantity and we have a lot of experience with building robust electronics specific to this industry, user serviceable parts and supply chain. --- End quote --- If you have to compromise some features to fit a standard fanless box pc for this many unit, I can understand the wish for custom boards. Although, the PC's are not that expensive. For sub 500$ you have one, maybe some discount for quantity, but I guess you can't go that low. --- End quote --- I don't see how computers are expensive... there's boards with soldered cpu like this one for example at 60$: https://www.newegg.com/Product/Product.aspx?Item=N82E16813157730&ignorebbr=1 Add 40$ for 4gb ddr3 and a ssd and you'll only need a psu to power it. but there's such boards with 12v or 18.5v dc in jacks See Asus H110T for example: https://www.amazon.com/H110T-CSM-LGA1151-Mini-ITX-Motherboard/dp/B01EZGYSGG --- End quote --- It would be insane to use anything as complex and overpowered as a PC for something like this. |
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