Re: [Discuss-gnuradio] Discuss-gnuradio Digest, Vol 187, Issue 13

[Ed Criscuolo]

If you just hit reply, it only goes back to the poster. You need to hit "reply 
all" to get it to go back to the list. 

@(^.^)@ Ed
Sent from my iPhone

> On May 11, 2018, at 1:40 PM, F salem  wrote:
> 
> Dear all 
> 
> I made alot of post but it didn't shown in the list why?
> 
> sincerely
> Fahad Alqurashi
> 
>  
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Re: [Discuss-gnuradio] Discuss-gnuradio Digest, Vol 187, Issue 13

[F salem]

Dear all

I made alot of post but it didn't shown in the list why?

sincerely
Fahad Alqurashi


From: Discuss-gnuradio  
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Sent: Friday, May 11, 2018 7:00:10 PM
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Subject: Discuss-gnuradio Digest, Vol 187, Issue 13

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Today's Topics:

   1. Re: Audio File transmission using Qpsk modulation (JONNY LEYIKUN)
   2. Re: RTP block / Opus vocoder (Adrian Musceac)
   3. Re: Tx Burst for Chirp signals (Yeo Jin Kuang Alvin (IA))
   4. Re: Tx Burst for Chirp signals (M?ller)
   5. Re: Tx Burst for Chirp signals (Yeo Jin Kuang Alvin (IA))
   6. Rx to tx GNU Radio (Yeo Jin Kuang Alvin (IA))
   7. Re: Issue while adding streaming data : Integrating MRC in
  gr-ieee 80211 (Sumit Kumar)


--

Message: 1
Date: Thu, 10 May 2018 17:29:25 -0400
From: JONNY LEYIKUN 
To: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Audio File transmission using Qpsk
modulation
Message-ID:

Content-Type: text/plain; charset="utf-8"

HI  Jeff Long

Yaah 15K is very minimum to use in USRP sink
I use 15K sample rate in order to get clear  Audio File. but I also use
large sample rate in USRP sink but the result is more or less the same
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Message: 2
Date: Fri, 11 May 2018 00:34:06 +0300
From: Adrian Musceac 
To: Albin Stig? 
Cc: GNURadio Discussion List 
Subject: Re: [Discuss-gnuradio] RTP block / Opus vocoder
Message-ID:

Content-Type: text/plain; charset="UTF-8"

Hi Albin,

Sorry, I was under the impression that RTP would be transmitted over
the air, which in some cases might make sense... like IP multicast
over MPEG-TS over DVB-S. But for Codec2 it does seem like raw audio
transmission is better suited. So then why the need for a Codec2/Opus
RTP block? I would think it would be better left to the application
layer outside GNU Radio to handle IP routing of audio streams?

My previous approach was to use GNU Radio blocks only for the PHY
layer, and use a simple and robust VOIP protocol (Mumble) to
distribute audio over TCP/IP, with some transcoding involved in case
of FM and Codec2 digital voice. With a single GNU Radio instance I
could then serve up to 4 voice channels and one control channel using
FDMA, with a mix of analog and digital channels.
Then again, this is just an amateur radio perspective, where network
capacity is not such a big issue and infrastructure density or SNR
performance are the limiting factor.

Regards,
Adrian YO8RZZ

On 5/10/18, Albin Stig?  wrote:
> Hi Adrian,
>
> UDP and RTP adds a lot of overhead to a codec like Codec2 and doesn't
> make any sense at all unless you wan't to route your packets over an
> IP WAN like the internet. Then it makes a lot of sense.
>
> I imagine the only use case for an RTP/Codec2 or RTP/Opus block is
> streaming audio from a remote receiver/transceiver over an existing IP
> network. If you only stream over LAN, UDP is good enough but the
> Internet an stack RTP is better. All streaming software like skype,
> facetime, hangouts etc use RTP.
>
>
> --Albin SM6WJM
>
> On Thu, May 10, 2018 at 10:05 PM, Adrian Musceac 
> wrote:
>>>
>>> We would like to combine Opus/CODEC2 and RTP multicast to have stereo
>>> field
>>> audio. The sources of the audio appear at different points in the stereo
>>> field, so that a roundtable conversation feels more like a roundtable,
>>> or
>>> so that two streams from two different SDRs are distinct.
>>>
>>
>> Hi Michelle,
>>
>> This is very interesting to me. I did some work with Codec2, Opus and
>> GNU Radio myself.
>> I'm curious though: RTP and UDP + IP encapsulation, isn't that a bit
>> too much overhead for a low bitrate codec like Codec2? A 40 msec audio
>> frame encoded with Codec2 1400 is only 48 bits, so the encapsulation
>> overhead is quite large. How does that affect low SNR