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Rockbox mail archiveSubject: Re: High kbps/Low kbps power consumptionRe: High kbps/Low kbps power consumption
From: <stevem_at_gator.net>
Date: Thu, 5 Jun 2003 18:14:49 -0400 (EDT) That was a really informative reply, John. Thank you very much! Steve > On Thu, 5 Jun 2003 13:08:28 -0400 (EDT), <stevem_at_gator.net> wrote: > >>As a followup to my previous email, I've noticed that my Jukebox >> recorder 20 has trouble with 320kbps-formatted MP3 music files when the >> battery level gets down to around 55 percent or less. Is this a known >> issue with the Jukebox? I didn't see much about it in the bug reporting >> list. >> >>I loaded the daily build ajz from June 4th, but I'm still having this >> problem. I can hear the hard drive being accessed, then, afer a while, >> the music will cut in again. It drops out intermittently. > > No, not a bug. Just an effect of running the thing at the edge of its > performance envelope. Contemplate how much data the thing has to move > to handle that bitrate and how much processing it takes and how much > power that requires. Given that there is a fixed amount of RAM, the > higher the bitrate the more often the drive runs. More power required. > You're simply overwhelming the unit and with no material gain in sound > quality. >> >>Anyway, seeing this happen is what prompted my previous question. Is it >> best not to play music on the recorder formatted above 128 kbps? > > I have very good ears and I can't hear the difference between the > original CD and 192kbps even on my mid-level home system playing > directly from the computer. I certainly can't hear the difference once > the sound goes through the Archos' audio output circuit and then through > headphones, even my PortaPros. It is a waste of space and processing > power to put anything above 128kbps on the Archos, unless perhaps you're > using the digital out to a high end system. > > I store all my rips at 192kbps on my computer. I downsample to 128kbps > for the Archos using CDex and LAME. On this 2 gig machine the process > is quite rapid. Since I have the disc space I simply maintain two file > trees, one for the original rips and one for the archos. > > If you're using the thing primarily in non-optimal listening > environments such as a noisy office, the car, jogging and such, you > might try going even lower. There is a tradeoff between bit rate and > battery life. You might find the lower sampling rate adequate for those > environments. > > I downsample my audio books to 32kbps. there is a little distortion but > it's acceptable, certainly better than, say, a mobile radio. My FM can > suck in whole chapters at once, spinning the hard drive only every 15-20 > minutes or so. That is how I get better than 14 hours' life out of a > charge. > > Best thing to do is simply experiment some. Downsample to various rates > and do some listening tests. When you find something you like, check > the battery life. You'll be pleasantly surprised. > > John > >> >>Thanks, >> >>Steve >> >> >>> Hi folks. >>> >>> I have an Archos recorder 20. Does playing a 320 kbps recording pull >>> more power from the batteries than playing a 64 kbps recording? >>> >>> >>> Thanks! >>> >>> >>> Steve >> >> > > --- > John De Armond > johngdDONTYOUDARE_at_bellsouth.net > http://bellsouthpwp.net/j/o/johngd/ > Cleveland, Occupied TN Received on 2003-06-06 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |