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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
Posted to sci.electronics.repair,alt.home.repair,rec.autos.tech
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How do USB players keep track of position.
The devices that plug into the cigarette lighter and play sound from a USB drive through car radio speakers have the ability to remember where they left off, and, even when power is removed from them when the car is turned off, they restart from the start of the file or segment, often the start of a song, that had been playing when the car was turned off. My question is, How does the device keep track of where to start up again. Is there a file written to the device that plugs into the cigarette lighter, or is it written to the USB drive? If to the device itself, will it look for a specific file name if a different USB drive is plugged in, or can it be fooled then into trying to play song 6, for example, on a different usb drive. I could experiment to learn this stuff but I just don't have any time to do that before or during my upcoming car trip, and you might already know. Plus I wanted to tell you how great these things are if your car radio doesn't have a USB or 3.5mm input. See background. Similar question about MP3 players. If one inputs to the car radio via the 3.5mm jack, it seems that the intermediate device can't keep track of anything, but the mp3 player can. Obviously, the information is stored in the MP3 player, but without my having to test, does anyone know if separate positions are kept for "music", "ebooks", and "podcasts"?. If so, that provides some versatility, and I could for example, put popular music in music, classical music in ebooks and broadway shows in podcasts. Or science podcasts in ebooks and history podcasts in podcasts. Background: My 2005 Toyota seems to have been made just a year or two before it would have been possible to connect USB and 3.5mm inputs to its radio, using the CD changer or satellite port. I wanted that because in that case the steering wheel controls would likely have controlled what was playing on a USB drive, and the song information would have displayed on the radio. But since I couldn't have that, it turns out, except for the quality of the microphone (which might reflect more the acoustics of the car. The sound from the microphone is very intelligible, but my friend whom I called is good at being critical) the devices that plug into a cigarette lighter and communicate with RF do an amazing job. And they cost only about 16 to 22 dollars. One very compact one is only 11. I can give you specific urls if you want, but much of the difference is what will work best physically in your own car, depending on where the lighter is and what direction the opening points. Other differences are whether they have a USB input, a USB charging port, a 3.5mm input, a TF input, a 1" square screen or less, and whether they will also connect with bluetooth to your cell phone. If they do the latter, they have a button that will answer the phone and hang up, and they use their own built-in microphone and the car radio speakers. --- This email has been checked for viruses by AVG. http://www.avg.com |
#2
Posted to sci.electronics.repair,alt.home.repair,rec.autos.tech
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How do USB players keep track of position.
On 11/2/2017 6:25 AM, BurfordTJustice wrote:
another fool that can not use a search engine.... stay in your Safe place...billy bob. "micky" wrote in message ... : : The devices that plug into So, instead of just giving him the answer, you waste precious time of usenet users by denigrating him personally. Good job... |
#3
Posted to sci.electronics.repair,alt.home.repair,rec.autos.tech
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How do USB players keep track of position.
replying to micky, Iggy wrote:
All software outside of the USB, as far as I can tell...except the cell going to the car audio, that's wiring and such too. In 1-car I had a 3.5 plug and that always jumped back to the beginning of the drive, same on the PC when I took the drive back to add more. But then, both my Radio Transmitter, in another car, and now in my new car leave off exactly where I unplugged or turned off, to the second and not to the beginning of the song. It's likely just live-logging the drive's cluster block or running an instant auto-save at the unplug/switch-off on just capacitor power. -- for full context, visit https://www.homeownershub.com/mainte...n-1149479-.htm |
#4
Posted to sci.electronics.repair,alt.home.repair,rec.autos.tech
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How do USB players keep track of position.
micky wrote:
The devices that plug into the cigarette lighter and play sound from a USB drive through car radio speakers have the ability to remember where they left off, and, even when power is removed from them when the car is turned off, they restart from the start of the file or segment, often the start of a song, that had been playing when the car was turned off. My question is, How does the device keep track of where to start up again. Is there a file written to the device that plugs into the cigarette lighter, or is it written to the USB drive? If to the device itself, will it look for a specific file name if a different USB drive is plugged in, or can it be fooled then into trying to play song 6, for example, on a different usb drive. The memory is in the car radio, not the USB device. Every time you power up the car radio, it checks some timestamp in the file system to see if there has been an update. If not, it knows where it was in the file. If it detects a change, it will rescan the whole USB device to find the new (or deleted) files. Also, I think if the battery on your car runs down, it will lose that info and have to rescan. Jon |
#5
Posted to sci.electronics.repair,alt.home.repair,rec.autos.tech
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How do USB players keep track of position.
In rec.autos.tech, on Thu, 02 Nov 2017 12:18:24 -0700, mike
wrote: On 11/2/2017 6:25 AM, BurfordTJustice wrote: another fool that can not use a search engine.... stay in your Safe place...billy bob. "micky" wrote in message ... : : The devices that plug into So, instead of just giving him the answer, you waste precious time of usenet users by denigrating him personally. Good job... Buford is what used to be called a juvenile delinquent. But thanks to you and everyone else. --- This email has been checked for viruses by AVG. http://www.avg.com |
#6
Posted to sci.electronics.repair
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How do USB players keep track of position.
micky wrote:
The devices that plug into the cigarette lighter and play sound from a USB drive through car radio speakers have the ability to remember where they left off, if they are programmed specifically to do so. and, even when power is removed from them when the car is turned off, they restart from the start of the file or segment, often the start of a song, that had been playing when the car was turned off. if they are programmed specifically to do so. My question is, How does the device keep track of where to start up again. they are programmed specifically to do so. Is there a file written to the device that plugs into the cigarette lighter, or is it written to the USB drive? There is hardware allowing both to be programmed for that purpose If to the device itself, will it look for a specific file name if a different USB drive is plugged in, or can it be fooled then into trying to play song 6, for example, on a different usb drive. Computer viruses can sometimes re-program a USB or other device to suit its purposes. For example, notice that font types, sounds or colors may change seemingly for no reason. |
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