|Subject:||Re: Question regarding transmission of a tone using QPSK|
|Date:||Wed, 15 Jul 2020 02:49:06 +0000|
Hi Jeff Long,
Thank you so much for your reply.
I understand the plot of the signal source now. I have the mpsk_stage6.grc running properly from the tutorial, and was able to compare the transmitting and receiving bit streams. I attached the grc file to this email. Additionally, could you please elaborate more on the byte output of the signal source? Are they packed? Unpacked?
Moreover, as you stated that i should encode an analog signal to data before transmission, so does that mean I also have to use codecs in order to transmit a tone?
My last question would be: if I were to transmit an mp3 file, which is already encoded, will i be able to recover the audio using audio decoders?
Thanks again for your help!
ps: I apologize for my many questions as they may seem very basic. I am an engineering student and I am greatly thankful for your advice.
From: Discuss-gnuradio <email@example.com> on behalf of Jeff Long <firstname.lastname@example.org>
Sent: Tuesday, July 14, 2020 9:57 PM
To: GNURadio Discussion List <email@example.com>
Subject: Re: Question regarding transmission of a tone using QPSK
A better explanation of why that plot is correct: if you sample a tone twice per cycle, you see [-1,1,-1,1,...]. Four times per cycle, looks like [-1,0,1,0,...]. Even though it looks discontinuous, it will sound like a tone when played through your sound card due to filtering in the audio software and/or hardware.
That tutorial goes through the low level portions of the digital chain, including timing recovery. Framing, error correction and (optionally) an audio codec would all be in addition to the blocks shown in the tutorial.
On Tue, Jul 14, 2020 at 9:03 PM Jeff Long <firstname.lastname@example.org> wrote:
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