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 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/ogg-dev/attachments/20130321/a23e633e/attachment.htm
Fernando Alberto Marengo Rodriguez
2013-Mar-22 15:42 UTC
[ogg-dev] Min and max cutoff frequency
Dear Benjamin,> What is yourmotivation for constructing this hardware? ?Is your goal to learn/teach from the experience, or are you trying to build something that you cannot buy? Yes, I am interested in learning how Ogg Vorbis works, and what its performance is in audio players in comparison with MP3 and AAC players. It is said that Ogg encoded files have higher quality than MP3 encoded files. It would be interested to verify that in hardware, not just in audio player software. We have been investigating about Flac, but for the time being we know little about Ogg Vorbis. Could you please tell me which Ogg audio player hardware is available in the market? Thank you very much and bestregards, Fernando ________________________________ De: Benjamin Schwartz <benjamin.m.schwartz at gmail.com> Para: Fernando Alberto Marengo Rodriguez <fmarengorodriguez at yahoo.com.ar> CC: Monty Montgomery <monty at xiph.org>; Silvia Pfeiffer <silvia at silvia-pfeiffer.de>; "ogg-dev at xiph.org" <ogg-dev at xiph.org>; Sergio Castells <canistells77 at hotmail.com>; Lisandro Conde <lisfconde at yahoo.com.ar>; Muro Gustavo <gmuro at fceia.unr.edu.ar> Enviado: viernes, 22 de marzo de 2013 0:30 Asunto: Re: [ogg-dev] Min and max cutoff frequency 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/ogg-dev/attachments/20130322/5c282065/attachment.htm
On Fri, Mar 22, 2013 at 8:42 AM, Fernando Alberto Marengo Rodriguez < fmarengorodriguez at yahoo.com.ar> wrote:> Dear Benjamin, > > > 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? > > Yes, I am interested in learning how Ogg Vorbis works, and what its > performance is in audio players in comparison with MP3 and AAC players. It > is said that Ogg encoded files have higher quality than MP3 encoded files. > It would be interested to verify that in hardware, not just in audio player > software. >I don't quite see why this is interesting. A correctly functioning Ogg Vorbis decoder, whether made of silicon or C or javascript, will produce the same output from the same file. I suppose that "correctly functioning" and "the same output" are subtle concepts, so it could be interesting to verify the correctness of different implementation.> We have been investigating about Flac, but for the time being we know > little about Ogg Vorbis. Could you please tell me which Ogg audio player > hardware is available in the market? >"player hardware" is a very difficult concept. Every Android phone is an Ogg Vorbis audio player; to most users that qualifies as "Ogg audio player hardware". However, it sounds like you are interested in lower-cost, lower-power solutions. We maintained a list of low-power Vorbis decoders at http://wiki.xiph.org/Vorbis_Hardware . Calling these "hardware decoders" is problematic. There is a spectrum from firmware running on general-purpose CPUs, to DSPs (perhaps with some Vorbis-specific additions), to complete silicon decoder logic with a microcontroller CPU for dispatch. From the manufacturer-supplied documentation, it is not always possible to tell where on this spectrum each product stands. --Ben> > > Thank you very much and best regards, > Fernando > > ------------------------------ > *De:* Benjamin Schwartz <benjamin.m.schwartz at gmail.com> > *Para:* Fernando Alberto Marengo Rodriguez <fmarengorodriguez at yahoo.com.ar> > > *CC:* Monty Montgomery <monty at xiph.org>; Silvia Pfeiffer < > silvia at silvia-pfeiffer.de>; "ogg-dev at xiph.org" <ogg-dev at xiph.org>; Sergio > Castells <canistells77 at hotmail.com>; Lisandro Conde < > lisfconde at yahoo.com.ar>; Muro Gustavo <gmuro at fceia.unr.edu.ar> > *Enviado:* viernes, 22 de marzo de 2013 0:30 > > *Asunto:* Re: [ogg-dev] Min and max cutoff frequency > > 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 > > >-------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/ogg-dev/attachments/20130323/fe10358e/attachment.htm