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Subject: Re: Sound Quality Settings

Re: Sound Quality Settings

From: Christopher Woods <christof_at_infinitus.co.uk>
Date: Wed, 1 Nov 2006 16:34:41 -0000

Ah, you're a blind user - I didn't realise that, I'm a sighted rockbox user
myself.

Bitrates of 16, 24, 48, 64, 80, 96, 112, 128, 192, 224, 256, 320 kbps are
all MP3 bitrates (and for mono MP3 files, just halve those bitrates for the
same quality settings, as the bitrate is divided up between the L and R
channel for stereo files). Wave files are (if they're following the Red Book
CD standard) always 44100 kilohertz at 16 bits per second samplerate and in
stereo, and I know that the build of rockbox I use on my device can only
record to wave file at the aforementioned settings.

I'll have to put the latest build of rockbox onto my device and check these
new options out sometime, because from what you've said, it sounds like the
ability to choose a bitrate to record directly to MP3 has been implemented,
but the option to actually choose the file format isn't in the same dialog
screen... Any other sighted users who've used this build care to jump into
the discussion?

> -----Original Message-----
> From: Rich De Steno [mailto:ironrock_at_verizon.net]
> Sent: 01 November 2006 16:13
> To: christof_at_infinitus.co.uk; Rockbox
> Subject: Re: Sound Quality Settings
>
> When I go into recording settings in the menus, I hear choices for
> Quality and Frequency. The Frequency is set at
> 44 and cannot be changed, but the Quality has many bit rate choices
> such as 128, 192 etc. Are you saying this setting is irrelevant? I
> don't hear anything about choosing to record in MP3, is this an option
> somewhere in the menus? I also don't hear any option for setting the
> time and date like I used to do on my old Archos with Rockbox. Sorry,
> but the quality and frequency recording settings choices have really
> confused me.
>
> ----- Original Message -----
> From: "Christopher Woods" <christof_at_infinitus.co.uk>
> To: "'Rockbox'" <rockbox_at_cool.haxx.se>
> Sent: Wednesday, November 01, 2006 10:39 AM
> Subject: RE: Sound Quality Settings
>
>
> >I don't have that build installed, but to me it sounds like
> the bitrate
> > option is just shown all the time, even though its setting
> only actually
> > applies if you have MP3 chosen as your destination file format.
> >
> >> -----Original Message-----
> >> From: Thom Johansen [mailto:thomj_at_pvv.ntnu.no]
> >> Sent: 01 November 2006 14:01
> >> To: Rockbox
> >> Subject: Re: Sound Quality Settings
> >>
> >> Rich De Steno wrote:
> >> > I use Rockbox with the voice option. I installed an
> >> updated version
> >> > of Rockbox from a few days ago on my Iriver H120 and I
> noticed some
> >> > changes from my previous version, including a choice of
> >> recording bit
> >> > rates. I know that bit rate determines the quality of MP3
> >> files, but
> >> > I did not know that bit rates were associated with WAV
> files. What
> >> > was the bit rate at before we had a choice? Has the bug
> been fixed
> >> > yet relating to not being able to stop a recording with the STOP
> >> > button? Are there any plans to allow for recording in the
> >> Ogg Vorbis
> >> > or some other more compact format? How about ability to
> >> set the clock?
> >>
> >> The bit rate for WAVs is decided by the number of bits per sample,
> >> the number of channels and the sample rate. At 44100 Hz sample
> >> rate, stereo and 16 bit samples, the bit rate is
> >> 1411 kbps, which is AFAIK the only bit rate Rockbox has been
> >> capable of recording since recording was included. Right now
> >> there's also an option to record mono files, which would halve the
> >> bit rate. Also, as far as I know, you really don't have a choice
> >> now either. The only WAV quality option I can find is the full
> >> quality one.
> >> As for recording in more compact formats, we currently support MP3,
> >> which as you probably know is lossy, and Wavpack
> >> (WV) which is a lossless format.
> >> Ogg Vorbis will probably not be supported for a good while thanks
> >> to seeming to need a more powerful CPU than we have in what targets
> >> we currently support.
> >> What do you mean about setting the clock? Sample rate? If so, this
> >> is something you can expect seeing in the not too
> distant future.
> >>
> >> Thom
> >>
> >>
> >
>
>
>
Received on 2006-11-01


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