Rockbox Development > Starting Development and Compiling
Adding time delay to left channel on sound output
Llorean:
Does your car have 100% isolation from outside noise?
It seems like you're going through an awful lot of effort to "improve" sound in a situation where background noise will overwhelm and of the incredibly minor improvements you're going to get from avoiding one extra D->A conversion (assuming decent things are doing the conversion) or trying to adjust the audio delay a few milliseconds.
ew:
Can you really tell the difference? Sound travels at 1125 ft/sec. Assuming that the right speaker is 4 ft more than the left one, you are trying to insert a delay of a whopping .0036 seconds!
Do you have front and rear speakers in your car? Does the back sound out of phase with the front?
Perhaps I am just not getting something here.
saratoga:
--- Quote from: ew on March 24, 2010, 05:13:29 PM ---Can you really tell the difference? Sound travels at 1125 ft/sec. Assuming that the right speaker is 4 ft more than the left one, you are trying to insert a delay of a whopping .0036 seconds!
--- End quote ---
Thats actually a pretty large difference, and you can pretty easily hear it. Thats a large part of how your ears directional hearing works.
http://en.wikipedia.org/wiki/Interaural_time_difference
yapper:
Obviously any adjustment you make to suit the driver will have an opposite effect on the passenger's experience.
s3t:
Llorean, my isolation is quite mediocre, so i really doubt whether its worthwhile to build "hi-end" system in car environment...
In the other hand, the iriver's analog output is not that good, and the idea of player>spdif>dac>amplifier signal path is really great for in-car use - there is no noise coming from long RCA cables that run across the car, nor hum of ground mismatches between head unit and amplifier grounds.
The alteration of RockBox's source code is in my opinion the easiest way to get the feature of time alignment, as it should be simple to implement.
Another way of doing this is to build hardware device that will take i2s, split it into 2 channels, and run one of channels thru FIFO buffer. But it is way too much hassle for the task.
ew,
The difference is whether you feel like you are standing on the left to the singer, or in front of him.
yapper, both driver and passenger can't be happy in the car the same time...
Mostly i drive alone, so there are no passengers. And if there are some - they rarely are audiophiles. And even if they actually are audiophiles - i could be able to turn off the time correction thru the menu.
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