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index.html
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<!DOCTYPE html>
<!-- vim: set ts=4: -->
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0"/>
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="mobile-web-app-capable" content="yes">
<!--
Modified from original Node-Red source, for audio system visualization
Copyright 2013 IBM Corp.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<head>
<title>Audio System Design Tool for Teensy Audio Library</title>
<link href="bootstrap/css/bootstrap.min.css" rel="stylesheet" media="screen">
<link href="jquery/css/smoothness/jquery-ui-1.10.3.custom.min.css" rel="stylesheet" media="screen">
<link rel="stylesheet" type="text/css" href="orion/built-editor.css"/>
<link rel="stylesheet" type="text/css" href="font-awesome/css/font-awesome.min.css"/>
<link rel="stylesheet" href="style.css">
<style>
table.doc {border-spacing:3px; border-collapse:separate; font-size: 80%}
tr.top {background-color:#C0C0C0}
tr.odd {background-color:#F0F0F0}
tr.even {background-color:#E0E0E0}
p.func {padding-bottom:0; margin:0px}
p.desc {padding-left:2em; margin:0px; padding-top:0.2em; padding-bottom:0.8em; font-size:0.75em}
p.exam {padding-left:2em; text-indent:-1.2em; margin:0px; padding-top:0; padding-bottom:0.5em; font-size:0.75em; font-weight:bold}
pre.desc {padding-left:3em; margin:0px; padding-top:0em; padding-bottom:0.8em; font-size:0.75em;
background-color:#FFFFFF; border:0px; line-height:100%;
}
span.indent {padding-left:2em}
span.literal {color: #006699}
span.comment {color: #777755}
span.keyword {color: #cc6600}
span.function {color: #996600}
span.mainfunction {color: #993300; font-weight: bolder}
</style>
</head>
<body spellcheck="false">
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="navbar-inner">
<div class="container-fluid">
<span class="brand">Audio System Design Tool for <a href="http://www.pjrc.com/teensy/td_libs_Audio.html" target="_blank">Teensy Audio Library</a></span>
<div class="btn-group pull-right">
<a class="btn dropdown-toggle" data-toggle="dropdown" href="#"><i class="icon-align-justify"></i> <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a id="btn-sidebar" tabindex="-1" href="#"><i class="icon-ok pull-right"></i><i class="icon-list-alt"></i> Sidebar</a></li>
<li class="divider"></li>
<!-- <li><a id="btn-node-status" tabindex="-1" href="#"><i class="icon-ok pull-right"></i><i class="icon-info-sign"></i> Node Status</a></li>
<li class="divider"></li>
-->
<!--
<li class="dropdown-submenu pull-left"><a tabindex="-1" href="#"><i class="icon-edit"></i> Import from...</a>
<ul class="dropdown-menu">
<li><a id="btn-import" tabindex="-1" href="#"><i class="icon-edit"></i> Clipboard...</a></li>
<li id="flow-menu-parent" class="dropdown-submenu pull-left">
<a tabindex="-1" href="#"><i class="icon-book"></i> Library</a>
<ul class="dropdown-menu"></ul>
</li>
</ul>
</li>
<li id="li-menu-export" class="dropdown-submenu disabled pull-left"><a tabindex="-1" href="#"><i class="icon-share"></i> Export to...</a>
<ul class="dropdown-menu">
<li id="li-menu-export-clipboard" class="disabled"><a id="btn-export-clipboard" tabindex="-1" href="#"><i class="icon-share"></i> Clipboard...</a></li>
<li id="li-menu-export-library" class="disabled"><a id="btn-export-library" tabindex="-1" href="#"><i class="icon-book"></i> Library...</a></li>
</ul>
</li>
<li class="divider"></li>
-->
<!--
<li><a id="btn-config-nodes" tabindex="-1" href="#"><i class="icon-th-list"></i> Configuration nodes...</a></li>
<li class="divider"></li>
-->
<!--
<li class="dropdown-submenu pull-left"><a tabindex="-1" href="#"><i class="icon-th-large"></i> Workspaces</a>
<ul id="workspace-menu-list" class="dropdown-menu">
<li><a id="btn-workspace-add" tabindex="-1" href="#"><i class="icon-plus"></i> Add</a></li>
<li><a id="btn-workspace-edit" tabindex="-1" href="#"><i class="icon-edit"></i> Rename</a></li>
<li><a id="btn-workspace-delete" tabindex="-1" href="#"><i class="icon-minus"></i> Delete</a></li>
<li class="divider"></li>
</ul>
</li>
<li class="divider"></li>-->
<li><a id="btn-keyboard-shortcuts" tabindex="-1" href="#"><i class="icon-question-sign"></i> Keyboard Shortcuts</a></li>
<li><a id="btn-help" tabindex="-1" href="http://node-red.github.io/docs" target="_blank"><i class="icon-question-sign"></i> Help...</a></li>
</ul>
</div>
<div class="btn-group pull-left">
<a id="btn-deploy" class="btn action-deploy disabled" href="#"><i id="btn-icn-deploy" class="icon-upload"></i>Export</a>
<a id="btn-import" class="btn action-import disabled" href="#"><i id="btn-icn-download" class="icon-download"></i>Import</a>
</div>
</div>
</div>
</div>
<div id="main-container" class="sidebar-closed">
<div id="palette">
<img src="img/spin.svg" class="palette-spinner"/>
<div id="palette-container" class="palette-scroll">
</div>
<div id="palette-search">
<i class="icon-search"></i><input id="palette-search-input" type="text" placeholder="filter"><a href="#" id="palette-search-clear"><i class="icon-remove"></i></a></input>
</div>
</div><!-- /palette -->
<div id="workspace">
<ul id="workspace-tabs"></ul>
<!--<div id="workspace-add-tab"><a id="btn-workspace-add-tab" href="#"><i class="icon-plus"></i></a></div>-->
<div id="chart"></div>
<div id="workspace-toolbar">
<div class="btn-group">
<a class="btn btn-small" href="#"><i class="icon-zoom-out"></i></a>
<a class="btn btn-small" href="#"><i class="icon-th"></i></a>
<a class="btn btn-small" href="#"><i class="icon-zoom-in"></i></a>
</div>
</div>
</div>
<div id="chart-zoom-controls">
<div class="btn-group">
<a class="btn btn-mini" id="btn-zoom-out" href="#"><i class="icon-zoom-out"></i></a>
<a class="btn btn-mini" id="btn-zoom-zero" href="#"><i class="icon-th"></i></a>
<a class="btn btn-mini" id="btn-zoom-in" href="#"><i class="icon-zoom-in"></i></a>
</div>
</div>
<div id="sidebar">
<ul id="sidebar-tabs"></ul>
<div id="sidebar-content"></div>
</div>
<div id="sidebar-separator"></div>
</div>
<div id="notifications"></div>
<div id="dropTarget"><div>Drop the flow here</div></div>
<div id="dialog" class="hide"><form id="dialog-form" class="form-horizontal"></form></div>
<div id="node-config-dialog" class="hide"><form id="dialog-config-form" class="form-horizontal"></form><div class="form-tips" id="node-config-dialog-user-count"></div></div>
<div id="node-dialog-confirm-deploy" class="hide">
<form class="form-horizontal">
<div id="node-dialog-confirm-deploy-config" style="text-align: center; padding-top: 30px;">
Some of the nodes are not properly configured. Are you sure you want to deploy?
</div>
<div id="node-dialog-confirm-deploy-unknown" style="text-align: center; padding-top: 10px;">
The workspace contains some unknown node types:
<ul style="width: 300px; margin: auto; text-align: left;" id="node-dialog-confirm-deploy-unknown-list"></ul>
Are you sure you want to deploy?
</div>
</form>
</div>
<div id="node-dialog-error-deploy" class="hide">
<form class="form-horizontal">
<div id="node-dialog-error-deploy-noio" style="text-align: center; padding-top: 10px;">
<p>The workspace contains no input/output nodes!</p>
<p>You need an input or an output to export the data!</p>
<p>Without such a input/output function the exported
code will not run properly!</p>
</div>
</form>
</div>
<div id="node-help" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="node-help-label" aria-hidden="true">
<div class="modal-header">
<h5 id="node-help-label">Keyboard Shortcuts <span style="float: right;"><a href="http://node-red.github.io/docs" target="_blank">Open help in new window »</a></span></h5>
</div>
<div class="modal-body">
<table>
<tr>
<td><span class="help-key">?</span></td><td>Help</td>
<td><span class="help-key">Ctrl</span> <span class="help-key">a</span></td><td>Select all nodes</td>
</tr>
<tr>
<td><span class="help-key">Ctrl</span> <span class="help-key">Space</span></td><td>Toggle sidebar</td>
<td><span class="help-key">Shift</span> <span class="help-key">Click</span></td><td>Select all connected nodes</td>
</tr>
<tr>
<td><span class="help-key">Ctrl</span> <span class="help-key">z</span></td><td>Undo</td>
<td><span class="help-key">Ctrl</span> <span class="help-key">Click</span></td><td>Add/remove node from selection</td>
</tr>
<tr>
<td></td><td></td>
<td><span class="help-key">Delete</span></td><td>Delete selected nodes or link</td>
</tr>
<tr>
<td><span class="help-key">Ctrl</span> <span class="help-key">x</span></td><td>Cut selected nodes</td>
<td></td><td></td>
</tr>
<tr>
<td><span class="help-key">Ctrl</span> <span class="help-key">c</span></td><td>Copy selected nodes</td>
<td><span class="help-key">Ctrl</span> <span class="help-key">v</span></td><td>Paste nodes</td>
</tr>
<tr>
<td><span class="help-key">Ctrl</span> <span class="help-key">i</span></td><td>Import nodes</td>
<td><span class="help-key">Ctrl</span> <span class="help-key">e</span></td><td>Export selected nodes</td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
<tr>
<td><span class="help-key">Ctrl</span> <span class="help-key">+</span></td><td>Zoom in</td>
<td><span class="help-key">Ctrl</span> <span class="help-key">-</span></td><td>Zoom out</td>
</tr>
</table>
</div>
<div class="modal-footer">
<button class="btn" data-dismiss="modal" aria-hidden="true">Close</button>
</div>
</div>
<div id="node-dialog-library-save-confirm" class="hide">
<form class="form-horizontal">
<div style="text-align: center; padding-top: 30px;">
A <span id="node-dialog-library-save-type"></span> called <span id="node-dialog-library-save-name"></span> already exists. Overwrite?
</div>
</form>
</div>
<div id="node-dialog-library-save" class="hide">
<form class="form-horizontal">
<div class="form-row">
<label for="node-dialog-library-save-folder"><i class="icon-folder-open"></i> Folder</label>
<input type="text" id="node-dialog-library-save-folder" placeholder="Folder">
</div>
<div class="form-row">
<label for="node-dialog-library-save-filename"><i class="icon-file"></i> Filename</label>
<input type="text" id="node-dialog-library-save-filename" placeholder="Filename">
</div>
</form>
</div>
<div id="node-dialog-library-lookup" class="hide">
<form class="form-horizontal">
<div class="form-row">
<ul id="node-dialog-library-breadcrumbs" class="breadcrumb">
<li class="active"><a href="#">Library</a></li>
</ul>
</div>
<div class="form-row">
<div style="vertical-align: top; display: inline-block; height: 100%; width: 30%; padding-right: 20px;">
<div id="node-select-library" style="border: 1px solid #999; width: 100%; height: 100%; overflow:scroll;"><ul></ul></div>
</div>
<div style="vertical-align: top; display: inline-block;width: 65%; height: 100%;">
<div style="height: 100%; width: 95%;" class="node-text-editor" id="node-select-library-text" ></div>
</div>
</div>
</form>
</div>
<div id="node-dialog-rename-workspace" class="hide">
<form class="form-horizontal">
<div class="form-row">
<label for="node-input-workspace-name" ><i class="icon-tag"></i> Name:</label>
<input type="text" id="node-input-workspace-name">
</div>
</form>
</div>
<div id="node-dialog-delete-workspace" class="hide">
<form class="form-horizontal">
<div style="text-align: center; padding-top: 30px;">
Are you sure you want to delete '<span id="node-dialog-delete-workspace-name"></span>'?
</div>
</form>
</div>
<script type="text/x-red" data-template-name="export-clipboard-dialog">
<div class="form-row">
<label for="node-input-export" style="display: block; width:100%;"><i class="icon-share"></i> Source Code:</label>
<textarea readonly style="font-family: monospace; font-size: 12px; background:rgb(226, 229, 255); padding-left: 0.5em;" class="input-block-level" id="node-input-export" rows="12"></textarea>
</div>
<div class="form-tips">
Select the text above and copy to the clipboard with Ctrl-A Ctrl-C.
</div>
</script>
<script type="text/x-red" data-template-name="export-library-dialog">
<div class="form-row">
<label for="node-input-filename" ><i class="icon-tag"></i> Filename:</label>
<input type="text" id="node-input-filename" placeholder="Filename">
</div>
</script>
<script type="text/x-red" data-template-name="import-dialog">
<div class="form-row">
<label for="node-input-import"><i class="icon-share"></i>Nodes:</label>
<textarea style="font-family: monospace; font-size: 12px; background:rgb(226, 229, 255); padding-left: 0.5em;" class="input-block-level" id="node-input-import" rows="5" placeholder="Paste nodes here, or lookup in the library. When importing Arduino code, the whole flow will be replaced."></textarea>
</div>
<div class="form-tips">
<label for="node-input-arduino" style="font-size: 13px; padding: 2px 0px 0px 4px;">
<input style="margin-bottom: 4px; margin-right: 4px;" type="checkbox" id="node-input-arduino" checked="checked" class="input-block-level" />
Import copied code from the Arduino IDE
</label>
</div>
</script>
<script src="jquery/js/jquery-1.9.1.js"></script>
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TODO: generate some or all of this automatically from the C++ source
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TODO: add a field for maximum instance count
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{"type":"AudioEffectDigitalCombine","data":{"shortName":"combine","inputs":2,"outputs":1,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioFilterBiquad","data":{"defaults":{"name":{"value":"new"}},"shortName":"biquad","inputs":1,"outputs":1,"category":"filter-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioFilterFIR","data":{"defaults":{"name":{"value":"new"}},"shortName":"fir","inputs":1,"outputs":1,"category":"filter-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioFilterStateVariable","data":{"defaults":{"name":{"value":"new"}},"shortName":"filter","inputs":2,"outputs":3,"category":"filter-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioFilterLadder","data":{"defaults":{"name":{"value":"new"}},"shortName":"ladder","inputs":3,"outputs":1,"category":"filter-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioAnalyzePeak","data":{"defaults":{"name":{"value":"new"}},"shortName":"peak","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioAnalyzeRMS","data":{"defaults":{"name":{"value":"new"}},"shortName":"rms","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioAnalyzeFFT256","data":{"defaults":{"name":{"value":"new"}},"shortName":"fft256","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioAnalyzeFFT1024","data":{"defaults":{"name":{"value":"new"}},"shortName":"fft1024","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioAnalyzeToneDetect","data":{"defaults":{"name":{"value":"new"}},"shortName":"tone","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioAnalyzeNoteFrequency","data":{"defaults":{"name":{"value":"new"}},"shortName":"notefreq","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioAnalyzePrint","data":{"defaults":{"name":{"value":"new"}},"shortName":"print","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioControlSGTL5000","data":{"defaults":{"name":{"value":"new"}},"shortName":"sgtl5000","inputs":0,"outputs":0,"category":"control-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioControlAK4558","data":{"defaults":{"name":{"value":"new"}},"shortName":"ak4558","inputs":0,"outputs":0,"category":"control-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioControlCS4272","data":{"defaults":{"name":{"value":"new"}},"shortName":"cs4272","inputs":0,"outputs":0,"category":"control-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioControlWM8731","data":{"defaults":{"name":{"value":"new"}},"shortName":"wm8731","inputs":0,"outputs":0,"category":"control-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioControlWM8731master","data":{"defaults":{"name":{"value":"new"}},"shortName":"wm8731m","inputs":0,"outputs":0,"category":"control-function","color":"#E6E0F8","icon":"arrow-in.png"}},
{"type":"AudioControlCS42448","data":{"defaults":{"name":{"value":"new"}},"shortName":"cs42448","inputs":0,"outputs":0,"category":"control-function","color":"#E6E0F8","icon":"arrow-in.png"}}
]}
</script>
<script type="text/x-red" data-help-name="AudioInputI2S">
<h3>Summary</h3>
<div class=tooltipinfo>
<p>Receive 16 bit stereo audio from the
<a href="http://www.pjrc.com/store/teensy3_audio.html" target="_blank">audio shield</a>
or another I2S device, using I2S master mode.</p>
<p align=center><img src="img/audioshield_inputs.jpg"></p>
</div>
<h3>Boards Supported</h3>
<ul>
<li>Teensy 3.2
<li>Teensy 3.5
<li>Teensy 3.6
<li>Teensy 4.0
<li>Teensy 4.1
</ul>
<h3>Audio Connections</h3>
<table class=doc align=center cellpadding=3>
<tr class=top><th>Port</th><th>Purpose</th></tr>
<tr class=odd><td align=center>Out 0</td><td>Left Channel</td></tr>
<tr class=odd><td align=center>Out 1</td><td>Right Channel</td></tr>
</table>
<h3>Functions</h3>
<p>This object has no functions to call from the Arduino sketch. It
simply streams data from the I2S hardware to its 2 output ports.</p>
<h3>Hardware</h3>
<p align=center><img src="img/audioshield_backside.jpg"></p>
<p>The I2S signals are used in "master" mode, where Teensy creates
all 3 clock signals and controls all data timing.</p>
<table class=doc align=center cellpadding=3>
<tr class=top><th>T3.x<br>Pin</th><th>T4.x<br>Pin</th><th>Signal</th><th>Direction</th></tr>
<tr class=odd><td align=center>9</td><td align=center>21</td><td>BCLK</td><td>Output</td></tr>
<tr class=odd><td align=center>11</td><td align=center>23</td><td>MCLK</td><td>Output</td></tr>
<tr class=odd><td align=center>13</td><td align=center>8</td><td>RX</td><td>Input</td></tr>
<tr class=odd><td align=center>23</td><td align=center>20</td><td>LRCLK</td><td>Output</td></tr>
</table>
<p>Audio from
master mode I2S may be used in the same project as ADC, DAC and
PWM signals, because all remain in sync to Teensy's timing</p>
<p>Compatible CODEC Chips:
<ul>
<li><a href="https://www.pjrc.com/store/teensy3_audio.html">STGL5000</a>
<li><a href="https://forum.pjrc.com/threads/42665-New-Audio-Board!-TI-TLV320AIC3206">TLV320AIC3206</a>
<li><a href="https://forum.pjrc.com/threads/32276-HiFi-Audio-CODEC-Module-AK4558-evaluation-board-in-a-square-inch-PCB">AK4558</a>
<li>WM8731
</ul>
</p>
<p>Compatible ADC Chips:
<ul>
</ul>
</p>
<p>Compatible Microphones:
<ul>
<li><a href="https://forum.pjrc.com/threads/47010-I2S-Microphone-(SPH0645LM4H-B)?p=157101&viewfull=1#post157101">SPH0645LM4H-B</a>
<li><a href="https://forum.pjrc.com/threads/50534-Why-MEMS-i2s-microphone-ICS-43432-with-teensy-audio-library-not-working?p=173279&viewfull=1#post173279">ICS43432</a>
<li><a href="https://forum.pjrc.com/threads/49065-ICS43434-I2S-Digital-Microphone-and-Teensy-3-2">ICS43434</a>
</ul>
</p>
<h3>Examples</h3>
<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughStereo
</p>
<p class=exam>File > Examples > Audio > Recorder
</p>
<p class=exam>File > Examples > Audio > Analysis > PeakMeterStereo
</p>
<p class=exam>File > Examples > Audio > Analysis > FFT
</p>
<p class=exam>File > Examples > Audio > Analysis > SpectrumAnalyzerBasic
</p>
<p class=exam>File > Examples > Audio > Effects > Chorus
</p>
<p class=exam>File > Examples > Audio > Effects > Flange
</p>
<p class=exam>File > Examples > Audio > Effects > Filter
</p>
<p class=exam>File > Examples > Audio > Effects > Filter_FIR
</p>
<h3>Notes</h3>
<p>Normally, this object is used with the Audio Shield, which
is controlled separately by the "sgtl5000" object.</p>
<p>Only one I2S input and one I2S output object may be used. Master
and slave modes may not be mixed (both must be of the same type).
</p>
<p>I2S master objects can be used together with non-I2S input and output
objects, for simultaneous audio streaming on different hardware.</p>
</script>
<script type="text/x-red" data-template-name="AudioInputI2S">
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
</script>
<script type="text/x-red" data-help-name="AudioInputI2SQuad">
<h3>Summary</h3>
<div class=tooltipinfo>
<p>Receive 16 bit quad (4) channel audio from two
<a href="http://www.pjrc.com/store/teensy3_audio.html" target="_blank">audio shields</a>
or another I2S devices, using I2S master mode.</p>
<p align=center><img src="img/audioshield_quad_in.jpg"></p>
</div>
<h3>Boards Supported</h3>
<ul>
<li>Teensy 3.2
<li>Teensy 3.5
<li>Teensy 3.6
<li>Teensy 4.0
<li>Teensy 4.1
</ul>
<h3>Audio Connections</h3>
<table class=doc align=center cellpadding=3>
<tr class=top><th>Port</th><th>Purpose</th></tr>
<tr class=odd><td align=center>Out 0</td><td>Channel #1</td></tr>
<tr class=odd><td align=center>Out 1</td><td>Channel #2</td></tr>
<tr class=odd><td align=center>Out 2</td><td>Channel #3</td></tr>
<tr class=odd><td align=center>Out 3</td><td>Channel #4</td></tr>
</table>
<h3>Functions</h3>
<p>This object has no functions to call from the Arduino sketch. It
simply streams data from the I2S hardware to its 4 output ports.</p>
<h3>Hardware</h3>
<p>See this Sparkfun blog for <a href="https://www.sparkfun.com/news/2055" target="_blank">how
to connect two audio adaptors for 4 channel audio</a>.</p>
<p>For Teensy 4 and Rev D audio shields, see
<a href="https://forum.pjrc.com/threads/61123?p=242054&viewfull=1#post242054">this forum thread</a>.</p>
<p>The I2S signals are used in "master" mode, where Teensy creates
all 3 clock signals and controls all data timing.</p>
<table class=doc align=center cellpadding=3>
<tr class=top><th>Teensy<br>3.2<br>Pin</th><th>Teensy<br>3.5/3.6<br>Pin</th><th>Teensy<br>4.x<br>Pin</th><th>Signal</th><th>Direction</th></tr>
<tr class=odd><td align=center>9</td><td align=center>9</td><td align=center>21</td><td>BCLK</td><td>Output</td></tr>
<tr class=odd><td align=center>11</td><td align=center>11</td><td align=center>23</td><td>MCLK</td><td>Output</td></tr>
<tr class=odd><td align=center>13</td><td align=center>13</td><td align=center>8</td><td>RX</td><td>Input</td></tr>
<tr class=odd><td align=center>30</td><td align=center>38</td><td align=center>6</td><td>RX</td><td>Input</td></tr>
<tr class=odd><td align=center>23</td><td align=center>23</td><td align=center>20</td><td>LRCLK</td><td>Output</td></tr>
</table>
<p>Audio from
master mode I2S may be used in the same project as ADC, DAC and
PWM signals, because all remain in sync to Teensy's timing</p>
<h3>Examples</h3>
<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughQuad
</p>
<h3>Notes</h3>
<p>On Teensy 3.x, the BCLK/LRCLK ratio is 32, which is not compatible with
most MEMS microphones. Teensy 4.x uses BCLK/LRCLK ratio, which can
be used with I2S MEMS microphones.</p>
<p>Normally, this object is used with two Audio Shield, which
are controlled separately by a pair "sgtl5000" object.</p>
</script>
<script type="text/x-red" data-template-name="AudioInputI2SQuad">
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
</script>
<script type="text/x-red" data-help-name="AudioInputI2SHex">
<h3>Summary</h3>
<div class=tooltipinfo>
<p>Receive 6 channel audio from three I2S devices, using I2S master mode.</p>
</div>
<h3>Boards Supported</h3>
<ul>
<li>Teensy 4.0
<li>Teensy 4.1
</ul>
<h3>Audio Connections</h3>
<table class=doc align=center cellpadding=3>
<tr class=top><th>Port</th><th>Purpose</th></tr>
<tr class=odd><td align=center>Out 0</td><td>Channel #1</td></tr>
<tr class=odd><td align=center>Out 1</td><td>Channel #2</td></tr>
<tr class=odd><td align=center>Out 2</td><td>Channel #3</td></tr>
<tr class=odd><td align=center>Out 3</td><td>Channel #4</td></tr>
<tr class=odd><td align=center>Out 4</td><td>Channel #5</td></tr>
<tr class=odd><td align=center>Out 5</td><td>Channel #6</td></tr>
</table>
<h3>Functions</h3>
<p>This object has no functions to call from the Arduino sketch. It
simply streams data from the I2S hardware to its 6 output ports.</p>
<h3>Hardware</h3>
<p>The I2S signals are used in "master" mode, where Teensy creates
all 3 clock signals and controls all data timing.</p>
<table class=doc align=center cellpadding=3>
<tr class=top><th>Teensy<br>4.x Pin</th><th>Signal</th><th>Direction</th></tr>
<tr class=odd><td align=center>21</td><td>BCLK</td><td>Output</td></tr>
<tr class=odd><td align=center>23</td><td>MCLK</td><td>Output</td></tr>
<tr class=odd><td align=center>8</td><td>RX (ch 1+2)</td><td>Input</td></tr>
<tr class=odd><td align=center>6</td><td>RX (ch 3+4)</td><td>Input</td></tr>
<tr class=odd><td align=center>9</td><td>RX (ch 5+6)</td><td>Input</td></tr>
<tr class=odd><td align=center>20</td><td>LRCLK</td><td>Output</td></tr>
</table>
<h3>Examples</h3>
<!--<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughQuad
</p>-->
<h3>Notes</h3>
<p>Teensy 4.0 & 4.1's I2S port has a total of 5 data pins
which may each transmit or receive stereo digital audio. This
6 channel input may be used together with the I2S stereo or
quad channel I2S output, but may not be combined with others
which use the same physical pins.</p>
</script>
<script type="text/x-red" data-template-name="AudioInputI2SHex">
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
</script>
<script type="text/x-red" data-help-name="AudioInputI2SOct">
<h3>Summary</h3>
<div class=tooltipinfo>
<p>Receive 8 channel audio from three I2S devices, using I2S master mode.</p>
</div>
<h3>Boards Supported</h3>
<ul>
<li>Teensy 4.0
<li>Teensy 4.1
</ul>
<h3>Audio Connections</h3>
<table class=doc align=center cellpadding=3>
<tr class=top><th>Port</th><th>Purpose</th></tr>
<tr class=odd><td align=center>Out 0</td><td>Channel #1</td></tr>
<tr class=odd><td align=center>Out 1</td><td>Channel #2</td></tr>
<tr class=odd><td align=center>Out 2</td><td>Channel #3</td></tr>
<tr class=odd><td align=center>Out 3</td><td>Channel #4</td></tr>
<tr class=odd><td align=center>Out 4</td><td>Channel #5</td></tr>
<tr class=odd><td align=center>Out 5</td><td>Channel #6</td></tr>
<tr class=odd><td align=center>Out 6</td><td>Channel #7</td></tr>
<tr class=odd><td align=center>Out 7</td><td>Channel #8</td></tr>
</table>
<h3>Functions</h3>
<p>This object has no functions to call from the Arduino sketch. It
simply streams data from the I2S hardware to its 8 output ports.</p>
<h3>Hardware</h3>
<p>The I2S signals are used in "master" mode, where Teensy creates
all 3 clock signals and controls all data timing.</p>
<table class=doc align=center cellpadding=3>
<tr class=top><th>Teensy<br>4.x Pin</th><th>Signal</th><th>Direction</th></tr>
<tr class=odd><td align=center>21</td><td>BCLK</td><td>Output</td></tr>
<tr class=odd><td align=center>23</td><td>MCLK</td><td>Output</td></tr>
<tr class=odd><td align=center>8</td><td>RX (ch 1+2)</td><td>Input</td></tr>
<tr class=odd><td align=center>6</td><td>RX (ch 3+4)</td><td>Input</td></tr>
<tr class=odd><td align=center>9</td><td>RX (ch 5+6)</td><td>Input</td></tr>
<tr class=odd><td align=center>32</td><td>RX (ch 7+8)</td><td>Input</td></tr>
<tr class=odd><td align=center>20</td><td>LRCLK</td><td>Output</td></tr>
</table>
<h3>Examples</h3>
<!--<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughQuad
</p>-->
<h3>Notes</h3>
<p>Teensy 4.0 & 4.1's I2S port has a total of 5 data pins
which may each transmit or receive stereo digital audio. This
8 channel input may be used together with the I2S stereo
output, but may not be combined with others
which use the same physical pins.</p>
</script>
<script type="text/x-red" data-template-name="AudioInputI2SOct">
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
</script>
<script type="text/x-red" data-help-name="AudioInputI2S2">
<h3>Summary</h3>
<div class=tooltipinfo>
<p>Receive 16 bit stereo audio from an I2S device using the 2nd I2S port on Teensy 4.x.</p>
</div>
<h3>Boards Supported</h3>
<ul>
<li>Teensy 4.0
<li>Teensy 4.1
</ul>
<h3>Audio Connections</h3>
<table class=doc align=center cellpadding=3>
<tr class=top><th>Port</th><th>Purpose</th></tr>
<tr class=odd><td align=center>Out 0</td><td>Left Channel</td></tr>
<tr class=odd><td align=center>Out 1</td><td>Right Channel</td></tr>
</table>
<h3>Functions</h3>
<p>This object has no functions to call from the Arduino sketch. It
simply streams data from the I2S hardware to its 2 output ports.</p>
<h3>Hardware</h3>
<p>The I2S signals are used in "master" mode, where Teensy creates
all 3 clock signals and controls all data timing.</p>
<table class=doc align=center cellpadding=3>
<tr class=top><th>T4.x<br>Pin</th><th>Signal</th><th>Direction</th></tr>
<tr class=odd><td align=center>4</td><td>BCLK</td><td>Output</td></tr>
<tr class=odd><td align=center>33</td><td>MCLK</td><td>Output</td></tr>
<tr class=odd><td align=center>5</td><td>RX</td><td>Input</td></tr>
<tr class=odd><td align=center>3</td><td>LRCLK</td><td>Output</td></tr>
</table>
</p>
<h3>Examples</h3>
<h3>Notes</h3>
</script>
<script type="text/x-red" data-template-name="AudioInputI2S2">
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
</script>
<script type="text/x-red" data-help-name="AudioInputSPDIF3">
<h3>Summary</h3>
<div class=tooltipinfo>
<p>Receive S/PDIF digital audio, at the rate of the external digital audio source.</p>
<p><span style="color:red">This input is incompatible with most other inputs and outputs</span>
which run at a speed controlled by Teensy's internal sample rate.</p>
</div>
<h3>Boards Supported</h3>
<ul>
<li>Teensy 4.0
<li>Teensy 4.1
</ul>
<h3>Audio Connections</h3>
<table class=doc align=center cellpadding=3>
<tr class=top><th>Port</th><th>Purpose</th></tr>
<tr class=odd><td align=center>Out 0</td><td>Left Channel</td></tr>
<tr class=odd><td align=center>Out 1</td><td>Right Channel</td></tr>
</table>
<h3>Functions</h3>
<p class=func><span class=keyword>pllLocked</span>();</p>
<p class=desc>Returns true if the S/PDIF phase locked loop is tracking
the sample rate of incoming digital audio data.
</p>
<p class=func><span class=keyword>sampleRate</span>();</p>
<p class=desc>Returns the sample rate of incoming data, if the PLL has locked,
or returns 0 if the audio sample rate is unknown.
</p>
<h3>Hardware</h3>
<p>
<table class=doc align=center cellpadding=3>
<tr class=top><th>T4.x<br>Pin</th><th>Signal</th><th>Direction</th></tr>
<tr class=odd><td align=center>15</td><td>S/PDIF Data</td><td>Output</td></tr>
</table>
</p>
<h3>Examples</h3>
<!--<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughAsyncSpdif
</p>-->
<h3>Notes</h3>
<p>This input tries to force the entire audio library to run at the
sample rate of the incoming data. It usually can not be combined
with most other inputs and outputs which run at specific speeds.</p>
</script>
<script type="text/x-red" data-template-name="AudioInputSPDIF3">
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
</script>
<script type="text/x-red" data-help-name="AsyncAudioInputSPDIF3">
<h3>Summary</h3>
<div class=tooltipinfo>
<p>Receive S/PDIF digital audio and resample to Teensy's audio sample rate.</p>
<p>Asynchronous resampling contributed by <a href="https://github.com/alex6679">Alex Walch</a>.</p>
</div>
<h3>Boards Supported</h3>
<ul>
<li>Teensy 4.0
<li>Teensy 4.1
</ul>
<h3>Audio Connections</h3>
<table class=doc align=center cellpadding=3>
<tr class=top><th>Port</th><th>Purpose</th></tr>
<tr class=odd><td align=center>Out 0</td><td>Left Channel</td></tr>
<tr class=odd><td align=center>Out 1</td><td>Right Channel</td></tr>
</table>
<h3>Functions</h3>
<p class=func><span class=keyword>getBufferedTime</span>();</p>
<p class=desc>Returns the buffered time in seconds. The buffered time is the duration of the incoming samples which are not resampled yet. The step width of the resampling algorithm is constantly slightly adjusted to keep the buffered time closely to the target latency. The difference between the target latency and the buffered time is typically smaller than 1 microsecond.
</p>
<!--<p class=func><span class=keyword>getInputFrequency</span>();</p>
<p class=desc>TODO: documentation needed here
</p>-->
<p class=func><span class=keyword>isLocked</span>();</p>
<p class=desc>Returns true if the S/PDIF phase locked loop is tracking
the sample rate of incoming digital audio data.
</p>
<p class=func><span class=keyword>getInputFrequency</span>();</p>
<p class=desc>Returns the sample rate of incoming data, if the PLL has locked, or returns 0 if the audio sample rate is unknown.
</p>
<p class=func><span class=keyword>getTargetLantency</span>();</p>
<p class=desc>Returns the target latency in seconds. The latency is the time from the moment a sample is received by the Teensy SPDIF hardware receiver until it is transmitted by the asrc intput. The audio samples arrive at the asrc input in chunks of 32 samples per channel. The target latency consists of these 32 samples + some buffer that is needed to compensate for timing variations.
</p>
<p class=func><span class=keyword>getAttenuation</span>();</p>
<p class=desc>
Returns the actual achieved attenuation of the anti-aliasing filter. If the input sampling rate is smaller or equal to 44.1kHz, no low pass filtering is needed and zero is returned.
</p>
<p class=func><span class=keyword>getHalfFilterLength</span>();</p>
<p class=desc>Returns the half length of the resampling filter. Its complete length is 2*(the returned value)+1.
</p>
<h3>Hardware</h3>
<p>
<table class=doc align=center cellpadding=3>
<tr class=top><th>T4.x<br>Pin</th><th>Signal</th><th>Direction</th></tr>
<tr class=odd><td align=center>15</td><td>S/PDIF Data</td><td>Output</td></tr>
</table>
</p>
<h3>Examples</h3>
<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughAsyncSpdif
</p>
<h3>Notes</h3>
<p>AsyncAudioInputSPDIF3 is not able to clock the audio pipline (never has the 'update_responsibility'). At least 1 other input or output must be used to cause the entire Audio library to update.
</p>
<p>AsyncAudioInputSPDIF3 can optionally take parameters to alter its resampling behavior.
</p>
<p><span class=keyword>AsyncAudioInputSPDIF3</span> spdif_async1(<i>dither</i>, <i>noiseshaping</i>, <i>attenuation</i>, <i>minHalfFilterLength</i>, <i>maxHalfFilterLength</i>);
</p>
<p class=desc><i>dither</i>: triangular shaped dither is added at the transition from 32bit float to 16bit integer if true (default: true)
</p>
<p class=desc><i>noiseshaping</i>: noise shaping is applied at the aforementioned transition if true (default: true)
</p>
<p class=desc><i>attenuation</i>: target attenuation of the anti-aliasing filter (default: 100dB). The attenuation is not reached if a filter longer than 161 is needed.
</p>
<p class=desc><i>minHalfFilterLength</i>: half of the guaranteed resampling filter (internally restricted to 80, default: 20). The filter might be longer if needed to achieve the requested attenuation.
</p>
<p class=desc><i>maxHalfFilterLength</i>: Restricts the maximum length of the resampling filter. The maximum half filter length is 80. This parameter can be used to further restrict the length in order to limit the processor usage.
</p>
<p>The windowed (Kaiser window) sinc-function is used as resample filter (i.e. to interpolate the incoming signal). The longer the filter, the better the quality of the resampled signal. However, a longer filter has a higher group delay and increases the processor usage. The sinc- filter also serves as anti-aliasing filter if the input sample rate is larger than 44.1kHz. The filter length is automatically increased at high input sample rates to reach the specified attenuation. However its half length is restricted to 80. 32bit floating point arithmetic is used at the resampling stage and the resampled signal is transformed to 16 bit integers afterwards. Here it is possible to apply triangular shaped dither and noise shaping to increase the perceived signal-to-noise-ratio.</p>
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<h3>Summary</h3>
<div class=tooltipinfo>
<p>Receive audio using the built-in analog to digital converter.</p>
</div>
<h3>Boards Supported</h3>
<ul>
<li>Teensy 3.2
<li>Teensy 3.5
<li>Teensy 3.6
<li>Teensy 4.0 - experimental
<li>Teensy 4.1 - experimental
</ul>
<h3>Audio Connections</h3>
<table class=doc align=center cellpadding=3>
<tr class=top><th>Port</th><th>Purpose</th></tr>
<tr class=odd><td align=center>Out 0</td><td>Audio Channel</td></tr>
</table>
<h3>Functions</h3>