CW AUDIO FILTER SHOWCASE - QRQcw2024-03-29T05:24:36Zhttps://qrqcwnet.ning.com/forum/topics/cw-audio-filter-showcase?commentId=1993813%3AComment%3A38533&feed=yes&xn_auth=nousing a SERIES (input)/ PARAL…tag:qrqcwnet.ning.com,2023-07-12:1993813:Comment:1401622023-07-12T15:31:32.442ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>using a SERIES (input)/ PARALLEL(output) , CAPACITOR {double tuned}, 732 hertz, step down transformer, gives over a 3 db boost in sound output from a speaker - even just using a sound card's LINE OUTPUT gets almost 90 db of PURE SINE WAVE CW sound out of a cheap radio shack speaker, using an adjustable BASS tuning PORT(also adjusted to resonate at 732 hertz)</p>
<p><span style="font-size: 24pt;"><strong>[</strong></span>NO EXTERNAL AMP IS NEEDED 90 db of CW AUDIO VOLUME is…</p>
<p>using a SERIES (input)/ PARALLEL(output) , CAPACITOR {double tuned}, 732 hertz, step down transformer, gives over a 3 db boost in sound output from a speaker - even just using a sound card's LINE OUTPUT gets almost 90 db of PURE SINE WAVE CW sound out of a cheap radio shack speaker, using an adjustable BASS tuning PORT(also adjusted to resonate at 732 hertz)</p>
<p><span style="font-size: 24pt;"><strong>[</strong></span>NO EXTERNAL AMP IS NEEDED 90 db of CW AUDIO VOLUME is enough</p>
<p> to be heard throughout the whole house<span style="font-size: 24pt;"><strong>]</strong></span></p>
<p>NOTE: Transformer primary = 400 turns, 2ndary = 52 turns, has a large ferrite core that is</p>
<p>14 inches in length and 1 1/4 inch in diameter </p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/12144616301?profile=original" target="_blank" rel="noopener"><br/><img src="https://storage.ning.com/topology/rest/1.0/file/get/12144616301?profile=RESIZE_710x" width="721" class="align-full"/></a></p>
<p> </p>
<p>HERE IS THE READOUT withOUT using the STEP DOWN TRANSFORMER:</p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/12144617289?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/12144617289?profile=RESIZE_710x" width="721" class="align-full"/></a></p>
<p></p>
<p><strong>HERE IS THE SOUND DECIBEL readout WHEN using this large CUSTOM WOUND step down transformer:</strong></p>
<p><strong><a href="https://storage.ning.com/topology/rest/1.0/file/get/12144618457?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/12144618457?profile=RESIZE_710x" width="721" class="align-full"/></a></strong></p>
<p>DOUBLING THE AUDIBLE VOLUME OUTPUT from this RADIO SHACK SPEAKER</p>
<p></p>
<p></p> Square Wave to SiNE WAVE CW a…tag:qrqcwnet.ning.com,2023-03-13:1993813:Comment:1380852023-03-13T13:29:40.389ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p><span>Square Wave to SiNE WAVE CW audio filter converter using a large FERRiTE ROD double tuned to 800 hz</span></p>
<p><span><iframe width="560" height="315" src="https://www.youtube.com/embed/ZSGSQOZf860?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</span></p>
<p><span>series resonated by CAP to FERRITE ROD primary</span></p>
<p><span>parallel </span>resonated by CAP to FERRITE ROD secondary</p>
<p><span>Square Wave to SiNE WAVE CW audio filter converter using a large FERRiTE ROD double tuned to 800 hz</span></p>
<p><span><iframe width="560" height="315" src="https://www.youtube.com/embed/ZSGSQOZf860?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</span></p>
<p><span>series resonated by CAP to FERRITE ROD primary</span></p>
<p><span>parallel </span>resonated by CAP to FERRITE ROD secondary</p> Here is a good example of a s…tag:qrqcwnet.ning.com,2020-02-03:1993813:Comment:389342020-02-03T13:59:06.817ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is a good example of a specialized CW FILTER using Gstreamer code for listening to QRQ CW on HF</p>
<p><iframe allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/8HLEfX7Md4I?wmode=opaque" width="560"></iframe>
</p>
<p>using this Gstreamer code:<br></br>***************************<br></br>gst-launch-1.0 -v jackaudiosrc ! queue ! calf-sourceforge-net-plugins-eq5 ls-active=1 ls-level=0.015625 ls-freq=283.435 hs-active=1 hs-level=0.015625 hs-freq=1628.13 p1-active=1…</p>
<p>Here is a good example of a specialized CW FILTER using Gstreamer code for listening to QRQ CW on HF</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/8HLEfX7Md4I?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p>
<p>using this Gstreamer code:<br/>***************************<br/>gst-launch-1.0 -v jackaudiosrc ! queue ! calf-sourceforge-net-plugins-eq5 ls-active=1 ls-level=0.015625 ls-freq=283.435 hs-active=1 hs-level=0.015625 hs-freq=1628.13 p1-active=1 p1-freq=305.818 p1-level=0.015625 p2-active=1 p2-level=63 p2-freq=678.284 p2-q=0.5 p3-active=1 p3-level=0.015625 p3-freq=1508.97 ! queue ! jackaudiosink buffer-time=15000</p>
<p>even at 400 hz bandwidth on the RIG's CRYSTAL RX filter..there is some annoying lower frequency wind tunnel like howling...that this filter minimizes, without effecting too much, the good sound of the QRQ CW being received</p>
<p>NOTE: this Gstreamer code uses a standard LV2 plugin - Calf 5 BAND EQ <a href="https://calf-studio-gear.org/" target="_blank">https://calf-studio-gear.org/</a></p>
<p>- many thanks to Bryan for providing the CW for this test -</p>
<p></p> Here is another CW AUDIO BAND…tag:qrqcwnet.ning.com,2020-02-01:1993813:Comment:388302020-02-01T17:01:58.784ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is another CW AUDIO BANDPASS FILTER designed for listening to QRQ CW audio files</p>
<p><iframe allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/Gl1Ac2tt9Zg?wmode=opaque" width="560"></iframe>
</p>
<p>brief demo of using a Gstreamer 2 tiered CW AUDIO BANDPASS Filter for listening to CW AUDIO FILES from a CW Keyboard(AD5DZ)<br></br>The double filtering helps to get rid of virtual all of the CW ELEMENT percussive edge noise above and below the CW…</p>
<p>Here is another CW AUDIO BANDPASS FILTER designed for listening to QRQ CW audio files</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/Gl1Ac2tt9Zg?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p>
<p>brief demo of using a Gstreamer 2 tiered CW AUDIO BANDPASS Filter for listening to CW AUDIO FILES from a CW Keyboard(AD5DZ)<br/>The double filtering helps to get rid of virtual all of the CW ELEMENT percussive edge noise above and below the CW PITCH</p>
<p>using a simple Gstreamer script that includes 2 bandpass filters, staggered...1st step with a wider bandpass and lower Q than the 2nd... the filter can be adjusted to suit your own preferences for how "percussive" you want your own QRQ CW to sound...</p>
<p><br/>GSTREAMER CW AUDIO BANDPASS 2 TIERED FILTER SCRIPT<br/>***************************************************************<br/>gst-launch-1.0 -v interleave name=i ! audioconvert ! queue ! deinterleave name=d d.src_0 ! queue ! audioconvert ! audiowsincband mode=band-pass lower-frequency=607 upper-frequency=807 length=200 window=hamming ! audioamplify amplification=11.7 ! jackaudiosink name=CWoutput buffer-time=30000 jackaudiosrc name=CWinput ! queue ! audiowsincband mode=band-pass lower-frequency=607 upper-frequency=807 length=100 window=hamming ! audioconvert ! queue ! i.</p>
<p>NOTE: this Gstreamer incorporates the Gstreamer 'interleave' and 'deinterleave' method to get both bandpass filters integrated</p>
<p><a href="https://gstreamer.freedesktop.org/documentation/interleave/interleave.html?gi-language=c" target="_blank">https://gstreamer.freedesktop.org/documentation/interleave/interleave.html?gi-language=c</a></p>
<p><a href="https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good/html/gst-plugins-good-plugins-deinterleave.html" target="_blank">https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good/html/gst-plugins-good-plugins-deinterleave.html</a></p>
<p></p>
<p>NOTE: if your are using PULSEAUDIO you can still use this filter method by using one of the alsa loopback cables and say, FLdigi...FLDIGI OUTPUTS to an ALSA LOOPBACK...Gstreamer uses the output of the ALSA LOOPBACK as its "input" and then Gstreamer exits to the soundcard...(instead of using jackaudiosrc and jackaudiosink....try...pulsesrc & pulsesink and use the PAVUCONTROL to punch in the sound card output and the alsa loopback input for the Gstreamer input & output etc...</p>
<p>if you are using WINDOWS...instead of using ALSA LOOPBACK use a windows virtual audio cable..</p>
<p>if you are using MAC, use something like the soundflower virtual audio cable instead of alsa loopback</p> Here is a software CW FILTER…tag:qrqcwnet.ning.com,2020-01-04:1993813:Comment:385332020-01-04T17:07:49.688ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is a software CW FILTER demoD listening to a CW signal on 40 meter HF</p>
<p><iframe allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/1x_Y_dVK1r4?wmode=opaque" width="560"></iframe>
</p>
<p>Testing the CALF 5 BAND EQ FILTER for copying receive HF CW <br></br>******************************************************************<br></br> even with the rig's 400 hz wide crystal filter...this CALF 5 BAND EQ cw audio FILTER, helps to knock down even further, the…</p>
<p>Here is a software CW FILTER demoD listening to a CW signal on 40 meter HF</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/1x_Y_dVK1r4?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p>
<p>Testing the CALF 5 BAND EQ FILTER for copying receive HF CW <br/>******************************************************************<br/> even with the rig's 400 hz wide crystal filter...this CALF 5 BAND EQ cw audio FILTER, helps to knock down even further, the background HF static, hiss and noise</p>
<p>also, the CLI COMMAND LINE VERSION of this CALF 5 BAND EQ FILTER is demoD(dj slider to the right)and compared to the GUI version....</p>
<p>a spec an is also in view to compare what the CALF 5 BAND EQ FILTER GUI says its supposed to be, to what is actually being measured by the SPECan APP</p>
<p>once you have dialed in the CALF 5 BAND EQ FILTER the way you like... on the GUI...then...just punch in the numbers for a command line version of it using Gstreamer - that you can save easily and bring up again... and save some space on the desktop</p>
<p>here is the CLI GSTREAMER COMMAND LINE used to duplicate the CALF 5 BAND EQ FILTER GUI's filter settings:<br/>**********************************************<br/>gst-launch-1.0 -v jackaudiosrc ! calf-sourceforge-net-plugins-eq5 ls-active=1 ls-level=0.015625 ls-freq=283.435 hs-active=1 hs-level=0.015625 hs-freq=1628.13 p1-active=1 p1-freq=305.818 p1-level=0.015625 p2-active=1 p2-level=63 p2-freq=678.284 p2-q=0.5 p3-active=1 p3-level=0.015625 p3-freq=1508.97 ! jackaudiosink buffer-time=10000</p> Here is a software CW AUDIO f…tag:qrqcwnet.ning.com,2019-09-29:1993813:Comment:377282019-09-29T17:06:03.997ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is a software CW AUDIO filter setup on LINUX using an array of LOW PASS and HIGH PASS filters </p>
<p><iframe allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/9cpsCsrInJY?wmode=opaque" width="560"></iframe>
</p>
<p>brief demo of showing multiple LP & HP filters arranged in an array to help with QRQ CW COPY when using an EXPONENTIAL CW ELEMENT edge created by the AD5DZ CW Keyboard engine…<br></br></p>
<p>Here is a software CW AUDIO filter setup on LINUX using an array of LOW PASS and HIGH PASS filters </p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/9cpsCsrInJY?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p>
<p>brief demo of showing multiple LP & HP filters arranged in an array to help with QRQ CW COPY when using an EXPONENTIAL CW ELEMENT edge created by the AD5DZ CW Keyboard engine<br/><a href="https://youtu.be/l8wKVnA4oGc" target="_blank">https://youtu.be/l8wKVnA4oGc</a></p> Here is another custom design…tag:qrqcwnet.ning.com,2019-03-20:1993813:Comment:364332019-03-20T22:44:18.918ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is another custom designed W3NQN passive cw audio bandpass filter - BUTTERWORTH - 600 hertz wide - utilized in this video example for listening to QRQ CW COPY practice cassette tapes, so that if you want to repeat the last word or phrase, or jump ahead...by hitting the tape deck's REVIEW or CUE button...your ears will not be super blasted by the high pitched squeal from the tape deck going into high speed while the tape head is still engaged...etc... see video notes below for the 2…</p>
<p>Here is another custom designed W3NQN passive cw audio bandpass filter - BUTTERWORTH - 600 hertz wide - utilized in this video example for listening to QRQ CW COPY practice cassette tapes, so that if you want to repeat the last word or phrase, or jump ahead...by hitting the tape deck's REVIEW or CUE button...your ears will not be super blasted by the high pitched squeal from the tape deck going into high speed while the tape head is still engaged...etc... see video notes below for the 2 page PDF of the custom written design specs that W3NQN drew up for this filter...</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/IjOudUS8NlQ?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p>
<p>when using CUE & REVIEW, while listening to cassette tapes for QRQ CW COPY PRACTICE...hitting the CUE and/or REVIEW can blast your ears with very loud high pitched tones.... this custom designed CW AUDIO FILTER by W3NQN puts a stop to that ...</p>
<p>here is the 2 page PDF file of W3NQN's design papers on this filter<br/><a href="https://my.pcloud.com/publink/show?code=XZlySt7ZQQti25Q2UQVhhBG818l5tHqWmQk0" target="_blank">https://my.pcloud.com/publink/show?code=XZlySt7ZQQti25Q2UQVhhBG818l5tHqWmQk0</a></p> Here is a short video of what…tag:qrqcwnet.ning.com,2019-02-26:1993813:Comment:362312019-02-26T16:44:50.956ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is a short video of what QRQ CW sounds like after being filtered by the W3NQN passive CW AUDIO BANDPASS filter</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/d95GdgJ3cvg?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p>
<p>Here is a short video of what QRQ CW sounds like after being filtered by the W3NQN passive CW AUDIO BANDPASS filter</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/d95GdgJ3cvg?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p> Here is a specialized use of…tag:qrqcwnet.ning.com,2019-02-26:1993813:Comment:362302019-02-26T12:38:15.707ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is a specialized use of the typical 3-way speaker crossover to help get rid of the constant high pitch hiss coming out of most audio outputs of most rigs and audio op amps...especially when you listen to CW with headphones</p>
<p><iframe allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/B3RNveZ7R0o?wmode=opaque" width="560"></iframe>
</p>
<p><span>brief demo of using a RADIO SHACK 3-WAY CROSSOVER NETWORK circuit to reduce the usual high frequency audio…</span></p>
<p>Here is a specialized use of the typical 3-way speaker crossover to help get rid of the constant high pitch hiss coming out of most audio outputs of most rigs and audio op amps...especially when you listen to CW with headphones</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/B3RNveZ7R0o?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p>
<p><span>brief demo of using a RADIO SHACK 3-WAY CROSSOVER NETWORK circuit to reduce the usual high frequency audio hiss you hear in most audio amp, audio outputs...especially with headphones...that high pitched hiss can get on your nerves after operating your rig for a while... this simple 3 WAY CROSSOVER Network, i purchased at RADIO SHACK back in the 90's, works pretty well for getting rid of that unwanted high pitched audio amplifier output hiss, by tapping into the CROSSOVER's low pass network - that usually goes where the bass speaker is supposed to go... reduces drastically the amount of high freq hiss you hear constantly...and yet...not changing the quality of the CW AUDIO TONES you really want to hear</span></p>
<p><a class="yt-simple-endpoint style-scope yt-formatted-string" href="https://www.youtube.com/redirect?redir_token=iiDFrw1QHUZJc11A8suRmZ6NdHd8MTU1MTI3MDk4N0AxNTUxMTg0NTg3&q=https%3A%2F%2Fwww.picclickimg.com%2Fd%2Fl400%2Fpict%2F153212740464_%2FRadio-Shack-Realistic-Universal-3-Way-Crossover-Network.jpg&event=video_description&v=B3RNveZ7R0o" rel="nofollow noopener" target="_blank">https://www.picclickimg.com/d/l400/pi...</a> <a class="yt-simple-endpoint style-scope yt-formatted-string" href="https://www.youtube.com/redirect?redir_token=iiDFrw1QHUZJc11A8suRmZ6NdHd8MTU1MTI3MDk4N0AxNTUxMTg0NTg3&q=http%3A%2F%2Fwww.electronicecircuits.com%2Felectronic-circuits%2Fcrossover-network&event=video_description&v=B3RNveZ7R0o" rel="nofollow noopener" target="_blank"></a></p>
<p><a class="yt-simple-endpoint style-scope yt-formatted-string" href="https://www.youtube.com/redirect?redir_token=iiDFrw1QHUZJc11A8suRmZ6NdHd8MTU1MTI3MDk4N0AxNTUxMTg0NTg3&q=http%3A%2F%2Fwww.electronicecircuits.com%2Felectronic-circuits%2Fcrossover-network&event=video_description&v=B3RNveZ7R0o" rel="nofollow noopener" target="_blank">http://www.electronicecircuits.com/el...</a></p>
<p><span>NOTE: also works with SSB to get rid of the RADIO's audio output hiss by using the smaller inductor and less capacitance in a LOW PASS configuration</span></p> Here is a very good W3NQN, pa…tag:qrqcwnet.ning.com,2018-02-05:1993813:Comment:340422018-02-05T20:23:33.832ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is a very good W3NQN, passive, "GAUSSIAN" designed - cw audio bandpass filter - specifically designed for QRQ CW by W3NQN himself -The Gaussian design is used to preserve the integrity of the shape and sound of the cw notes...so that you don't get ringing, or echoing, or that tunnel sea-shell kind of sound etc...or warping of the shape of the cw edges...…</p>
<p></p>
<p>Here is a very good W3NQN, passive, "GAUSSIAN" designed - cw audio bandpass filter - specifically designed for QRQ CW by W3NQN himself -The Gaussian design is used to preserve the integrity of the shape and sound of the cw notes...so that you don't get ringing, or echoing, or that tunnel sea-shell kind of sound etc...or warping of the shape of the cw edges...</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/QJEK184CZPA?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p>
<p>Chebyshev and Butterworth cw audio bandpass passive filters usually do not have the ideal passband phase response for copying QRQ CW....they tend to add "coloration" to the cw notes and can even cause ringing and other audio artifacts....However, this unique W3NQN passive cw audio bandpass filter prototype uses a GAUSSIAN FILTER calculation for its inductors and capacitors...the Gaussian bandpass filter does preserve how the CW is supposed to "sound" - it does not color the "shape" of the cw note....</p>
<p>this video...demos the effectiveness of the filter by:</p>
<p>1. listening to a 40 meter cw qso on a web sdr rig.... the filter is bypassed to show how much qrm/qrn the filter is capable of reducing...</p>
<p>2. another test is a spectrum sweep, using a tone generator, a spectrum analyzer will store the sweep and show how well the filter tunes out the frequencies above and below the center(700 hertz) design bandpass frequency...</p>
<p>3. FLdigi is used at 120 wpm to show how well this W3NQN GAUSSIAN filter preserves the shape and sound of the original FLdigi tone... THE green wave on TOP is the original FLdigi wave, the RED wave on the bottom of the scope is the FLdigi tone AFTER it goes through the W3NQN GAUSSIAN cw audio bandpass filter...</p>
<p>4. then a textfile is sent by FLdigi at 120 wpm so you can hear how well the filter keeps the original sound of the FLdigi CW audio intact at qrq cw speeds...the filter does not add echo, ringing, or allow any altering of the shape of the original FLdigi cw notes...</p>
<p>here are the design blueprints on this project by W3NQN:<br/><a href="https://imgur.com/zauJdeV" target="_blank">https://imgur.com/zauJdeV</a><br/><a href="https://imgur.com/fxZoPUz" target="_blank">https://imgur.com/fxZoPUz</a></p>
<p>if you are interested in learning more about this filter, please contact W3NQN about this Gaussian Filter prototype</p>