brief test of 24 bit VS 32 bit uncompressed audio going from a laptop to a Raspberry pi 2b loopback - and then right back to the laptop over Ethernet cables going through router and switches
32 bit has virtual no variance from the original audio source
24 bit does show a wide berth of harmonics generated at the lowest db…
Added by Chuck aa0hw on January 26, 2020 at 7:39am — No Comments
NOTICE the DEAD ZONE in the following SCOPE view of sending a couple of 55 ms DITs... while trying to listen for how much QSK RECEIVE AUDIO is between those dits....NOTE: you will see a GAP of "NO AUDIO" from phase cancellation due to the technique that the K3 firmware uses to try and get "more" QSK audio for the QRQ OP's
Added by Chuck aa0hw on January 25, 2020 at 3:56pm — No Comments
this video demoS using GSTREAMER's audiointerleave and deinterleave plugins for a Gstreamer OPUS CODEC AUDIO OVER IP remote rig audio operations use...
break the 2 channel audio over ip pipelines into 2 individual pathways that can contain their own individual Gstreamer audio DSP plugins...
in this case....2 different…
this is a follow up video to this one:
the K1EL K40 CW KEYER's SPEAKER AUDIO OUTPUT is hooked directly to the Ferrite Bobbin Core Inductor Coil input...an EMF PICKUP COIL is right on top of the COIL(cheap telephone recording emf pickup coil)...connect the EMF PICKUP…Continue
Added by Chuck aa0hw on January 20, 2020 at 3:00pm — No Comments
brief demo of operating QRQ CW remote rig operations using an ELECRAFT K3S, a Raspberry PI 2b, a remote LINUX LUBUNTU 18.04 LAPTOP, and using Gstreamer PIPELINES for several functions:
1. audio over ip to and from the PI::RIG interface - full duplex
2. cw audio bandpass filter for transmit
3. PTT activation tone bandpass filter for…
Added by Chuck aa0hw on January 19, 2020 at 9:45am — No Comments
brief demo showing the AD5DZ remote keying system keying an ELECRAFT K3S from 100 to 200 wpm, with perfect CW NOTE construction (AFCW MODE)
first testing with a 1 DIT SEND test ...to see if the K3S can key it perfectly without missing any part of the CW ELEMENT
2nd - sending a text file at 150 wpm to see how it keys
Added by Chuck aa0hw on January 16, 2020 at 5:22pm — No Comments
the CW NOTE on the left is using a Raised cosine edge at 6ms rise/fall time with NO bandpass filtering...the harmonics are plentiful as shown on the spec an below it
the CW NOTE On the Right is using the same Raised cosine edge at 6ms - but in addition - is passing through a simple Gstreamer CLI bandpass filter...the BPF virtually eliminates all harmonics above and below the CW PITCH…Continue
Added by Chuck aa0hw on January 15, 2020 at 1:00pm — No Comments
using Gstreamer to encode & decode Live Morse Code audio from the audio output of the AD5DZ software CW KEYBOARD...and then send it out on the network as UDP PACKETS...receive, decode and playback...
- really excellent quality CW AUDIO resulted from this AC3 ENCODING/DECODING test with pretty low network bandwidth traffic requirements at…
Added by Chuck aa0hw on January 12, 2020 at 3:31pm — No Comments
brief demo showing an experimental setup using REMOTE RIG AUDIO over IP via Gstreamer SERVER::CLIENT scripts...and Gstreamer CW bandpass filter scripts...with a RASPBERRY PI 2b as the hardware/software/soundcard interface between the REMOTE OP and the RIG(K3S)
QRQ CW KEYBOARD = AD5DZ's RECRI KEYER CW KEYER apps…
Brief example of showing the inclusion of an LV2 AUDIO FILTER chain into a Gstreamer PIPELINE
1. to discover what LV2 plugins Gstreamer "picks up" on your system.. run this command gst-inspect-1.0 | more
2. when you find the LV2 you want to incorporate into your Gstreamer pipeline run the inspect command again using the Gstreamer LV2…
Added by Chuck aa0hw on December 20, 2019 at 11:36am — No Comments
Gstreamer encodes and decodes the CW AUDIO using the GSM AUDIO CODEC - plus - one bonus of using Gstreamer for Receiving the TRANSMIT PIPELINE, is that Gstreamer has its own CW AUDIO BANDPASS filter PLUGIN code that you can setup and use...to filter out most of the harsh harmonics, and poor sounding audio of such a low bitrate, low sample rate,…Continue
Added by Chuck aa0hw on December 14, 2019 at 8:31pm — No Comments
this setup uses a RASPBERRY PI and its audio output going to the WINDOWS 10 audio input and SSH to bring the PI's AD5DZ CW KEYER's GUI onto the WINDOWS 10 desktop...so you can can have access to the typing screen and all the settings...
see this video for more info on the basic hardware and software setup…Continue
Added by Chuck aa0hw on November 27, 2019 at 7:30pm — No Comments
brief demo of using Windscribe's VPN service(free version) to be able to get through a public WIFI router that is blocking all ports...
ALSO at the same time, using Gstreamer TCP audio over ip, OPUS AUDIO CODEC pipelines to create a 2-WAY full duplex audio stream between the WiFi OP and another OP that is online trying to QSO with the OP using…
Added by Chuck aa0hw on November 25, 2019 at 5:02pm — No Comments
this is a follow up video to the previous setup demo using an EMF coil and a CW KEYER's SPEAKER with a Gstreamer Bandpass Filter to clean up the KEYER's square wave harmonics and key clicks ...
this video is similar, only using the MFJ 451 CW Keyboard and placing…Continue
This demo shows the AD5DZ CW KEYBOARD sending CW at 60 wpm from a remote OP's location to a RASPBERRY PI 2b which is using the RIG's own sound card as its own sound card in order to send CW on that rig remotely, over ip, using AFCW MODE on LSB. In order to preserve the first bits of the CW ELEMENTS, when using VOICE VOX MODE on the RIG, on LOWER…Continue
brief QRQ CW example//demo of using dual send & receive scripts for operating REMOTE RIG OPERATIONS::REMOTE RIG AUDIO over IP using Gstreamer RTPrtxQUEUE scripts using the OPUS CODEC…
Added by Chuck aa0hw on October 3, 2019 at 10:30am — No Comments
Using a Raspberry PI2b and the AD5DZ CW Keying software suite -
The Pi is using the K3S internal USB SOUND CARD as its own sound card too...providing a direct LINE INPUT and LINE OUTPUT from the pi to the RIG and from the RIG to the PI
The PI sends audio to the…
Added by Chuck aa0hw on September 30, 2019 at 1:44pm — No Comments
every Raised Cosine Window that can be used to form the CW ELEMENT Rise/Fall time edges...sounds just a little bit different at QRQ CW speeds...this test was run at 55 wpm using the Riemann Window, and 3.3 milliseconds was also trimmed off of each element to make it just a tiny bit lighter, thinner sounding, between letters...
brief demo of selecting various raised cosine windows for copying qrq cw using the AD5DZ CPO, being keyed by the AD5DZ CW Keyboard....NOTE: ...might not hear much difference unless using a good set of headphones...the changes are subtle between all the raised cosine windows options....…Continue
Added by Chuck aa0hw on September 18, 2019 at 2:24pm — No Comments