[pulseaudio-discuss] Pulse Audio - Bluetooth HFP (HCI Mode) , Audio Quality issue and latency

[Luiz Augusto von Dentz]

Hi Vimal,

On Thu, Oct 12, 2017 at 9:08 AM, Vimal Babu <Vimal.Babu at nestgroup.net> wrote:
> Hi,
>
>
>
> The Bluetooth module we are using is BCM4339
>
>
>
> Configuration details
>
> ·         Bluez version is 5.37
>
> ·         Pulseaudio version is -8.0
>
> ·         Bluetooth Chip is in HCI mode
>
>
>
> Steps done
>
> ·         $ bluetoothctl  // scanned, paired, trusted,connected the mobile
> phone to our device
>
> ·         $ pactl list // we can see bluez.source and sink
>
> ·         Using ofono telephony service we have made call to other mobile
>
>
>
> Ring sound started to hear in our local speaker, when we attended the called
> at the receiver end.
>
>
>
> We are facing two issue, they are the following
>
> ·         Bluez.source to alsa sink (local speaker) the sound quality is
> poor.
>
> ·         USB MIC(local mic) to Bluez.sink, we have observed a latency of
> about 30-40 seconds for the audio.

I recall having some issue with buffering but 30-40 is extremely high,
have you tried with another mic or that the only mic available in the
system? Anyway I guess pasting the pulseaudio logs might be useful.

>
>
> What will be the cause of the latency in audio transfer from MIC to
> bluez.sink..? How can we improve audio quality and latency from mic side.
>
>
>
> Please help me….
>
>
>
> Regards,
> Vimal Babu
>
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-- 
Luiz Augusto von Dentz