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gr-dsd

Author: Clayton Smith
Email: argilo@gmail.com

The goal of this project is to package Digital Speech Decoder (DSD) as a GNU Radio block, so that it can be easily used with software radio peripherals such as the Ettus Research USRP or RTL2832U-based USB TV tuners.

Dependencies:

  • GNU Radio 3.7, 3.8, 3.9, or 3.10
  • libsndfile (libsndfile1-dev package in Ubuntu)
  • BOOST C++ source libraries (libboost-all-dev in Ubuntu)
  • libcppunit-dev
  • libitpp-dev
  • liblog4cpp5-dev
  • swig

Build instructions:

mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig

After running the above commands, "DSD Block" should appear under the "DSD" category in GNU Radio Companion, and "block_ff" will be available in the "dsd" Python package.

The block expects 48000 samples per second input, and outputs sound at 8000 samples per second. The input should be FM-demodulated (for example, with GNU Radio's Quadrature Demod block) and should be between -1 and 1 while receiving digital signals. (A quadrature demod gain of 1.6 works well for me for EDACS Provoice.) The input signal should also be free of DC bias, so make sure you are tuned accurately, or filter out DC.

To save CPU cycles, the block detects when the input is zero and avoids sending it through DSD. Thus it helps to put a squelch block before gr-dsd, especially if you're using many copies of gr-dsd in parallel.

The underlying DSD and mbelib were taken from:

No modifications to mbelib were required, but DSD has been modified to bypass the sound card. The GNU Radio block itself was adapted from the gr-howto-write-a-block sample included with GNU Radio.

Contributions are welcome!

About

GNU Radio block for Digital Speech Decoder

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hacktoberfest

Resources

Readme
GPL-3.0 license
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151 stars

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26 watching

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
GitHub - argilo/gr-dsd: GNU Radio block for Digital Speech Decoder · GitHub
Skip to content
BranchesTags
Repository files navigation
gr-dsd
Author: Clayton Smith

Email: argilo@gmail.com
The goal of this project is to package Digital Speech Decoder (DSD) as
a GNU Radio block, so that it can be easily used with software radio
peripherals such as the Ettus Research USRP or RTL2832U-based USB TV
tuners.
Dependencies:
  • GNU Radio 3.7, 3.8, 3.9, or 3.10
  • libsndfile (libsndfile1-dev package in Ubuntu)
  • BOOST C++ source libraries (libboost-all-dev in Ubuntu)
  • libcppunit-dev
  • libitpp-dev
  • liblog4cpp5-dev
  • swig
Build instructions:
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig

After running the above commands, "DSD Block" should appear under the
"DSD" category in GNU Radio Companion, and "block_ff" will be available
in the "dsd" Python package.
The block expects 48000 samples per second input, and outputs sound at
8000 samples per second. The input should be FM-demodulated (for
example, with GNU Radio's Quadrature Demod block) and should be between
-1 and 1 while receiving digital signals. (A quadrature demod gain of
1.6 works well for me for EDACS Provoice.) The input signal should
also be free of DC bias, so make sure you are tuned accurately, or
filter out DC.
To save CPU cycles, the block detects when the input is zero and avoids
sending it through DSD. Thus it helps to put a squelch block before
gr-dsd, especially if you're using many copies of gr-dsd in parallel.
The underlying DSD and mbelib were taken from:
No modifications to mbelib were required, but DSD has been modified to
bypass the sound card. The GNU Radio block itself was adapted from the
gr-howto-write-a-block sample included with GNU Radio.
Contributions are welcome!
About
GNU Radio block for Digital Speech Decoder
Topics
hacktoberfest
Resources
Readme
GPL-3.0 license
Activity
Stars
151 stars
Watchers
26 watching
Forks
50 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - argilo/gr-dsd: GNU Radio block for Digital Speech Decoder · GitHub
Skip to content
BranchesTags
Repository files navigation
gr-dsd
Author: Clayton Smith

Email: argilo@gmail.com
The goal of this project is to package Digital Speech Decoder (DSD) as
a GNU Radio block, so that it can be easily used with software radio
peripherals such as the Ettus Research USRP or RTL2832U-based USB TV
tuners.
Dependencies:
  • GNU Radio 3.7, 3.8, 3.9, or 3.10
  • libsndfile (libsndfile1-dev package in Ubuntu)
  • BOOST C++ source libraries (libboost-all-dev in Ubuntu)
  • libcppunit-dev
  • libitpp-dev
  • liblog4cpp5-dev
  • swig
Build instructions:
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig

After running the above commands, "DSD Block" should appear under the
"DSD" category in GNU Radio Companion, and "block_ff" will be available
in the "dsd" Python package.
The block expects 48000 samples per second input, and outputs sound at
8000 samples per second. The input should be FM-demodulated (for
example, with GNU Radio's Quadrature Demod block) and should be between
-1 and 1 while receiving digital signals. (A quadrature demod gain of
1.6 works well for me for EDACS Provoice.) The input signal should
also be free of DC bias, so make sure you are tuned accurately, or
filter out DC.
To save CPU cycles, the block detects when the input is zero and avoids
sending it through DSD. Thus it helps to put a squelch block before
gr-dsd, especially if you're using many copies of gr-dsd in parallel.
The underlying DSD and mbelib were taken from:
No modifications to mbelib were required, but DSD has been modified to
bypass the sound card. The GNU Radio block itself was adapted from the
gr-howto-write-a-block sample included with GNU Radio.
Contributions are welcome!
About
GNU Radio block for Digital Speech Decoder
Topics
hacktoberfest
Resources
Readme
GPL-3.0 license
Activity
Stars
151 stars
Watchers
26 watching
Forks
50 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - argilo/gr-dsd: GNU Radio block for Digital Speech Decoder · GitHub
Skip to content
BranchesTags
Repository files navigation
gr-dsd
Author: Clayton Smith

Email: argilo@gmail.com
The goal of this project is to package Digital Speech Decoder (DSD) as
a GNU Radio block, so that it can be easily used with software radio
peripherals such as the Ettus Research USRP or RTL2832U-based USB TV
tuners.
Dependencies:
  • GNU Radio 3.7, 3.8, 3.9, or 3.10
  • libsndfile (libsndfile1-dev package in Ubuntu)
  • BOOST C++ source libraries (libboost-all-dev in Ubuntu)
  • libcppunit-dev
  • libitpp-dev
  • liblog4cpp5-dev
  • swig
Build instructions:
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig

After running the above commands, "DSD Block" should appear under the
"DSD" category in GNU Radio Companion, and "block_ff" will be available
in the "dsd" Python package.
The block expects 48000 samples per second input, and outputs sound at
8000 samples per second. The input should be FM-demodulated (for
example, with GNU Radio's Quadrature Demod block) and should be between
-1 and 1 while receiving digital signals. (A quadrature demod gain of
1.6 works well for me for EDACS Provoice.) The input signal should
also be free of DC bias, so make sure you are tuned accurately, or
filter out DC.
To save CPU cycles, the block detects when the input is zero and avoids
sending it through DSD. Thus it helps to put a squelch block before
gr-dsd, especially if you're using many copies of gr-dsd in parallel.
The underlying DSD and mbelib were taken from:
No modifications to mbelib were required, but DSD has been modified to
bypass the sound card. The GNU Radio block itself was adapted from the
gr-howto-write-a-block sample included with GNU Radio.
Contributions are welcome!
About
GNU Radio block for Digital Speech Decoder
Topics
hacktoberfest
Resources
Readme
GPL-3.0 license
Activity
Stars
151 stars
Watchers
26 watching
Forks
50 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
GitHub - argilo/gr-dsd: GNU Radio block for Digital Speech Decoder · GitHub
Skip to content
BranchesTags
Repository files navigation
gr-dsd
Author: Clayton Smith

Email: argilo@gmail.com
The goal of this project is to package Digital Speech Decoder (DSD) as
a GNU Radio block, so that it can be easily used with software radio
peripherals such as the Ettus Research USRP or RTL2832U-based USB TV
tuners.
Dependencies:
  • GNU Radio 3.7, 3.8, 3.9, or 3.10
  • libsndfile (libsndfile1-dev package in Ubuntu)
  • BOOST C++ source libraries (libboost-all-dev in Ubuntu)
  • libcppunit-dev
  • libitpp-dev
  • liblog4cpp5-dev
  • swig
Build instructions:
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig

After running the above commands, "DSD Block" should appear under the
"DSD" category in GNU Radio Companion, and "block_ff" will be available
in the "dsd" Python package.
The block expects 48000 samples per second input, and outputs sound at
8000 samples per second. The input should be FM-demodulated (for
example, with GNU Radio's Quadrature Demod block) and should be between
-1 and 1 while receiving digital signals. (A quadrature demod gain of
1.6 works well for me for EDACS Provoice.) The input signal should
also be free of DC bias, so make sure you are tuned accurately, or
filter out DC.
To save CPU cycles, the block detects when the input is zero and avoids
sending it through DSD. Thus it helps to put a squelch block before
gr-dsd, especially if you're using many copies of gr-dsd in parallel.
The underlying DSD and mbelib were taken from:
No modifications to mbelib were required, but DSD has been modified to
bypass the sound card. The GNU Radio block itself was adapted from the
gr-howto-write-a-block sample included with GNU Radio.
Contributions are welcome!
About
GNU Radio block for Digital Speech Decoder
Topics
hacktoberfest
Resources
Readme
GPL-3.0 license
Activity
Stars
151 stars
Watchers
26 watching
Forks
50 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - argilo/gr-dsd: GNU Radio block for Digital Speech Decoder · GitHub
Skip to content
BranchesTags
Repository files navigation
gr-dsd
Author: Clayton Smith

Email: argilo@gmail.com
The goal of this project is to package Digital Speech Decoder (DSD) as
a GNU Radio block, so that it can be easily used with software radio
peripherals such as the Ettus Research USRP or RTL2832U-based USB TV
tuners.
Dependencies:
  • GNU Radio 3.7, 3.8, 3.9, or 3.10
  • libsndfile (libsndfile1-dev package in Ubuntu)
  • BOOST C++ source libraries (libboost-all-dev in Ubuntu)
  • libcppunit-dev
  • libitpp-dev
  • liblog4cpp5-dev
  • swig
Build instructions:
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig

After running the above commands, "DSD Block" should appear under the
"DSD" category in GNU Radio Companion, and "block_ff" will be available
in the "dsd" Python package.
The block expects 48000 samples per second input, and outputs sound at
8000 samples per second. The input should be FM-demodulated (for
example, with GNU Radio's Quadrature Demod block) and should be between
-1 and 1 while receiving digital signals. (A quadrature demod gain of
1.6 works well for me for EDACS Provoice.) The input signal should
also be free of DC bias, so make sure you are tuned accurately, or
filter out DC.
To save CPU cycles, the block detects when the input is zero and avoids
sending it through DSD. Thus it helps to put a squelch block before
gr-dsd, especially if you're using many copies of gr-dsd in parallel.
The underlying DSD and mbelib were taken from:
No modifications to mbelib were required, but DSD has been modified to
bypass the sound card. The GNU Radio block itself was adapted from the
gr-howto-write-a-block sample included with GNU Radio.
Contributions are welcome!
About
GNU Radio block for Digital Speech Decoder
Topics
hacktoberfest
Resources
Readme
GPL-3.0 license
Activity
Stars
151 stars
Watchers
26 watching
Forks
50 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - argilo/gr-dsd: GNU Radio block for Digital Speech Decoder · GitHub
Skip to content
BranchesTags
Repository files navigation
gr-dsd
Author: Clayton Smith

Email: argilo@gmail.com
The goal of this project is to package Digital Speech Decoder (DSD) as
a GNU Radio block, so that it can be easily used with software radio
peripherals such as the Ettus Research USRP or RTL2832U-based USB TV
tuners.
Dependencies:
  • GNU Radio 3.7, 3.8, 3.9, or 3.10
  • libsndfile (libsndfile1-dev package in Ubuntu)
  • BOOST C++ source libraries (libboost-all-dev in Ubuntu)
  • libcppunit-dev
  • libitpp-dev
  • liblog4cpp5-dev
  • swig
Build instructions:
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig

After running the above commands, "DSD Block" should appear under the
"DSD" category in GNU Radio Companion, and "block_ff" will be available
in the "dsd" Python package.
The block expects 48000 samples per second input, and outputs sound at
8000 samples per second. The input should be FM-demodulated (for
example, with GNU Radio's Quadrature Demod block) and should be between
-1 and 1 while receiving digital signals. (A quadrature demod gain of
1.6 works well for me for EDACS Provoice.) The input signal should
also be free of DC bias, so make sure you are tuned accurately, or
filter out DC.
To save CPU cycles, the block detects when the input is zero and avoids
sending it through DSD. Thus it helps to put a squelch block before
gr-dsd, especially if you're using many copies of gr-dsd in parallel.
The underlying DSD and mbelib were taken from:
No modifications to mbelib were required, but DSD has been modified to
bypass the sound card. The GNU Radio block itself was adapted from the
gr-howto-write-a-block sample included with GNU Radio.
Contributions are welcome!
About
GNU Radio block for Digital Speech Decoder
Topics
hacktoberfest
Resources
Readme
GPL-3.0 license
Activity
Stars
151 stars
Watchers
26 watching
Forks
50 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
GitHub - argilo/gr-dsd: GNU Radio block for Digital Speech Decoder · GitHub
Skip to content
BranchesTags
Repository files navigation
gr-dsd
Author: Clayton Smith

Email: argilo@gmail.com
The goal of this project is to package Digital Speech Decoder (DSD) as
a GNU Radio block, so that it can be easily used with software radio
peripherals such as the Ettus Research USRP or RTL2832U-based USB TV
tuners.
Dependencies:
  • GNU Radio 3.7, 3.8, 3.9, or 3.10
  • libsndfile (libsndfile1-dev package in Ubuntu)
  • BOOST C++ source libraries (libboost-all-dev in Ubuntu)
  • libcppunit-dev
  • libitpp-dev
  • liblog4cpp5-dev
  • swig
Build instructions:
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig

After running the above commands, "DSD Block" should appear under the
"DSD" category in GNU Radio Companion, and "block_ff" will be available
in the "dsd" Python package.
The block expects 48000 samples per second input, and outputs sound at
8000 samples per second. The input should be FM-demodulated (for
example, with GNU Radio's Quadrature Demod block) and should be between
-1 and 1 while receiving digital signals. (A quadrature demod gain of
1.6 works well for me for EDACS Provoice.) The input signal should
also be free of DC bias, so make sure you are tuned accurately, or
filter out DC.
To save CPU cycles, the block detects when the input is zero and avoids
sending it through DSD. Thus it helps to put a squelch block before
gr-dsd, especially if you're using many copies of gr-dsd in parallel.
The underlying DSD and mbelib were taken from:
No modifications to mbelib were required, but DSD has been modified to
bypass the sound card. The GNU Radio block itself was adapted from the
gr-howto-write-a-block sample included with GNU Radio.
Contributions are welcome!
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GNU Radio block for Digital Speech Decoder
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