PDA

View Full Version : Bit-correct digital output



Steinar Bjaerum
2005-03-15, 14:45
Sorry for not replying earlier. I missed your post on this busy list...

What I did, was that I downloaded a WAV encoded DTS file from
http://www.sr.se/multikanal/english/e_index.stm
(I did not rip a CD)

When sending the original WAV file through Squeezebox to my Home Theater
receiver I only heard noise.

I then modified the WAV file by reading it into Matlab, inverting the signs,
and writing to a new file.
This sign-inverted file played back correctly.

Steinar

> -----Original Message-----
> From: discuss-bounces (AT) lists (DOT) slimdevices.com [mailto:discuss-
> bounces (AT) lists (DOT) slimdevices.com] On Behalf Of Ed Atlee
> Sent: 2. mars 2005 17:17
> To: discuss (AT) lists (DOT) slimdevices.com
> Subject: [slim] Bit-correct digital output
>
>
> "Steinar Bjaerum" <steinar.bjaerum (AT) online (DOT) no>
> wrote in message news:200503010013.j210DFgm025992 (AT) mail42 (DOT) nsc.no...
> > Hi.
> >
> > I investigated the bit-correctness of the digital output of Squeezebox
> using
> > the DTS encoded as WAV method:
> >
> > I downloaded a DTS sample file encoded as a 44.1kHz WAV file.
> > I made a second version of the file where the sign was inverted for all
> > samples.
> > I connected the digital out of my Squeezebox to my hometheater receiver.
> >
> > Results when playing the WAVs on Squeezebox:
> > File with original sign results in only noise being played.
> > File with inverted sign is identified as DTS by my receiver and plays
> > correctly.
> > Conclusion: Squeezebox has bit-correct output except for inverted sign
> > (inverted phase).
>
> This was not what I experienced, unless for some reason the entire DTS CD
> that I had was phase-inverted and I didn't know it, either originally or
> by
> Exact Audio Copy. Or my preamp just accepts it anyway? I haven't played
> it
> in a couple of months, so I'll check it again. I'm using 5.4.0 now on Win
> XP.
>
> How did you invert the sign to create the second version of the file?
>
> Ed
>
>
>
>