From: Marcel Holtmann <marcel@holtmann.org>
To: BlueZ development <bluez-devel@lists.sourceforge.net>
Subject: Re: [Bluez-devel] Question about cvsd input and output
Date: Mon, 18 Aug 2008 07:09:43 +0200 [thread overview]
Message-ID: <1219036183.7591.13.camel@violet.holtmann.net> (raw)
In-Reply-To: <loom.20080817T214007-401@post.gmane.org>
Hi,
> I have looked all the old articles, but still have a question.
> In the Bluetooth spec, it said the CVSD input shall be 64ksample/s and 16-bit
> linear PCM.
> It also says the output of the CVSD decoder are 16-bit linear PCM
> digital samples, at a sampling frequency of 8 ksample/sec.
>
> I am a little confused about the data rate of the input side (64k*16bit =
> 1024kbps), which seems 8 times faster than the output of decoder.
>
> Besides, I tried to open a SCO socket between two adapters (scotest), and the
> maximum data rate in one direction is 128kbps.
> Thus, I don't think we can actually feed 64ksamples/sec, 16-bit voice data into
> the CVSD codec of the adapter.
the CVSD is only used over-the-air. The input for the host adapter is
based on the voice setting which defaults to 16-bit linear PCM.
Regards
Marcel
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prev parent reply other threads:[~2008-08-18 5:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-17 21:53 [Bluez-devel] Question about cvsd input and output Jui-Hao Chiang
2008-08-18 5:09 ` Marcel Holtmann [this message]
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