Rockbox Technical Forums

Rockbox Development => Feature Ideas => Topic started by: eric14 on August 07, 2008, 10:53:31 PM

Title: Left Right time alignment
Post by: eric14 on August 07, 2008, 10:53:31 PM
 I was sent here from the Audio Playback and Play list forum.
 After some great feedback and support in that forum, it was suggested that I come here with my idea for a new feature that Rockbox should already be set up to do.. I think.
 I'm building an auto sound system using my 60gig Ipod as the only head unit (receiver). Every reason that would make that a bad idea is addressed by Rockbox! Plus a parametric EQ 8).. Cool.
 What I was hoping to find by entering the forums was a left-right time delay feature that I might have missed in the manual. Now while I have no head unit at all, I know there are a lot of people that are using their Ipods (or other brand) docked to their head units. For those of them that paid somewhere near $1000 for that unit, and were able to use the 3-way active crossover and time alignment feature, more power to'em. But for most people docking their Ipods, even if they're using a built in 3-way crossover in the head unit, there is no feature to delay the sound to the driver to correspond to the speaker furthest from him (her).
 After reading through the section on crossfeeding, I was hoping that a simple left side/ right side alignment might be possible. By dropping most of the features, and adding an adjustment for delay in milliseconds.
 The only way to achieve a true time alignment from an Ipod would be to have an on board crossover, and run three separate lines out. Not happening. But, if a simple time delay for only left  and right channels were available, then most of the off center driver's seat issues would be addressed. Especially if the builder of the system paid attention to grouping the mid-bass, mid range and tweeters as closely together as possible. Like I did!
 As always, thank you for your time. And thank you for Rockbox!!!
Title: Re: Left Right time alignment
Post by: preglow on August 10, 2008, 08:53:09 AM
Well, this would just be a simple (unless sample granularity delay times aren't good enough) delay line, adding little overhead in terms of size and CPU usage, but someone would have to code it, and right now it won't be me...
Title: Re: Left Right time alignment
Post by: eric14 on August 10, 2008, 06:23:22 PM
 I wish I could.. I've never even written a program before! I would take this on myself with all the time and patience to get it right. I promise.
 If it were a motocross bike, I could have it running to perfection. But in this case I'm, well, a Newbie...
                    Thanks again.     Eric