From: Siegbert Baude <siegbert.baude@gmx.de>
To: BlueZ development <bluez-devel@lists.sourceforge.net>
Subject: Re: [Bluez-devel] SBC codec, joint stereo mode
Date: Thu, 04 Jan 2007 18:19:44 +0100 [thread overview]
Message-ID: <459D3730.6080504@gmx.de> (raw)
In-Reply-To: <459D26CF.5030709@palmsource.com>
Hi Fr=E9d=E9ric,
Fr=E9d=E9ric DALLEAU schrieb:
> page 53 says join[sb] is nrof_subbands-1 bits wide =3D> wich is 7 bits.
Oh, my blindness. Thanks a *lot* for the hint, maybe I didn't read it =
carefully enough, because the decoding code sample I looked first at, =
was evaluating nrof_subbands instead of nrof_subbands-1.
> The 8th bit is the RFA which is 0.
> 0xBC =3D 10111100, The first 7 bits are the join table, the last bit is =
> the rfa.
> Then 87 is already the scale factors.
Yep, now it makes sense.
BTW, is this the right list to ask SBC-specific questions? I have some =
more general questions, e.g. I don't quite understand the rationale =
behind the codec definition: If you choose joint mode for encoding, it =
happens that the encoder does not use joint mode for all subbands. But =
why? Saving bits? If anybody has a pointer to some documentation for =
SBC, which explains the design decisions I would be really happy.
Ciao
Siegbert
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next prev parent reply other threads:[~2007-01-04 17:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-04 14:36 [Bluez-devel] SBC codec, joint stereo mode Siegbert Baude
2007-01-04 16:09 ` Frédéric DALLEAU
2007-01-04 17:19 ` Siegbert Baude [this message]
2007-01-04 17:38 ` Brad Midgley
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