Hi, all
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.
Am I right? or it's just the limitation of my adapter
(Cyber Blue, Bluetooth EDR USB dongles,class II,V2.0)?
Bests
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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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