ogg dev - Mar 2013 - Min and max cutoff frequency

> Presuming that you are asking regarding the Ogg Vorbis audio format, the
> correct answer is: there is no minimum or maximum cutoff frequency.  Vorbis
> can code all frequencies from DC to Nyquist.  What Vorbis will actually do
> is extremely complex, extremely nonlinear, and highly dependent on bitrate.
> If you are in the mentality of linear time-invariant filters, you will
never
> be able to understand it.
Well, it's not quite that complex, but it is adaptive.  There are no
hard limits in the format.

You can sometimes make a prediction based on the encoder and specific
encoding mode... so, for what reason are you actually asking?

Monty

Dear Monty,
> You can sometimes make a prediction based on the encoder and specific
encoding mode...
How can I make such prediction for different encoding modes?
> so, for what reason are you actually asking

I am asking this because we are studying the OGG Vorbis format and its
applications. We are very interested in constructing an audio player hardware,
based on DSP or DSPic, and the audio files are stored in an SD card. There exist
some audio players like this, but are based on PIC and an MP3 decoder VS1011.
These players do not work for OGG Vorbis encoded audio files. We are more
interested in decoding these files, since OGG is open source. Do you happen to
know any Ogg Vorbis audio player?


Thank you very much and best regards, 

Fernando



________________________________
 De: Monty Montgomery <monty at xiph.org>
Para: Fernando Alberto Marengo Rodriguez <fmarengorodriguez at
yahoo.com.ar>
CC: Silvia Pfeiffer <silvia at silvia-pfeiffer.de>; Benjamin Schwartz
<ben at bemasc.net>; "ogg-dev at xiph.org" <ogg-dev at
xiph.org>; Sergio Castells <canistells77 at hotmail.com>
Enviado: jueves, 21 de marzo de 2013 12:08
Asunto: Re: [ogg-dev] Min and max cutoff frequency
 
> Presuming that you are asking regarding the Ogg Vorbis audio format, the
> correct answer is: there is no minimum or maximum cutoff frequency.? Vorbis
> can code all frequencies from DC to Nyquist.? What Vorbis will actually do
> is extremely complex, extremely nonlinear, and highly dependent on bitrate.
> If you are in the mentality of linear time-invariant filters, you will
never
> be able to understand it.
Well, it's not quite that complex, but it is adaptive.? There are no
hard limits in the format.

You can sometimes make a prediction based on the encoder and specific
encoding mode... so, for what reason are you actually asking?

Monty
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On Thu, Mar 21, 2013 at 9:54 AM, Fernando Alberto Marengo Rodriguez <
fmarengorodriguez at yahoo.com.ar> wrote:
> I am asking this because we are studying the OGG Vorbis format and its
> applications. We are very interested in constructing an audio player
> hardware, based on DSP or DSPic, and the audio files are stored in an SD
> card.
>
What is your motivation for constructing this hardware?  Is your goal to
learn/teach from the experience, or are you trying to build something that
you cannot buy?

--Ben
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