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Rockbox mail archiveSubject: Re: High kbps/Low kbps power consumptionRe: High kbps/Low kbps power consumption
From: Eugenio Perea <eugenio_at_perea.com>
Date: Thu, 05 Jun 2003 18:34:08 -0500 So you encode every CD twice? One for keeps at 192 and another for the Archos at 128? Eugenio Perea L. Neon John wrote: > 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 |