{"id":3088,"date":"2021-05-04T13:03:34","date_gmt":"2021-05-04T11:03:34","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=3088"},"modified":"2021-05-04T13:09:46","modified_gmt":"2021-05-04T11:09:46","slug":"stream-support-for-the-arduino-audio-tools-library-sound-generator","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2021\/05\/04\/stream-support-for-the-arduino-audio-tools-library-sound-generator\/","title":{"rendered":"Stream support for my \u201cArduino Audio Tools\u201d Library &#8211; A Sound Generator"},"content":{"rendered":"<p>Im my last couple of Blogs, I have demonstrated how we can use the low level API of my <a href=\"https:\/\/github.com\/pschatzmann\/arduino-audio-tools\">Arduino Audio Tools<\/a> library. Currently I am busy working on a high level API using <strong>Arduino <a href=\"https:\/\/www.arduino.cc\/reference\/en\/language\/functions\/communication\/stream\/\">Streams<\/a><\/strong>.<\/p>\n<p>I did not commit my latest changes yet but I want to take the opportunity to share some more examples: We all know the Arduino Streams. We use them to write out print messages and sometimes we use them to read the output from Serial devices.<\/p>\n<p>The same thing applies to my &#8220;Audio Streams&#8221;: You can read audio data from &#8220;Audio Sources&#8221; and you write them to &#8220;Audio Sinks&#8221;.<\/p>\n<p>Sometimes it is quite useful to be able to generate a test tone. We can use the <strong>GeneratedSoundStream class<\/strong> together with an implementation of the <strong>SoundGenerator class<\/strong>. In my example I use a <strong>SineWaveGenerator<\/strong>.<\/p>\n<p>In order to make sure that we use a consistent data type in the sound processing I also used a <code>typedef int16_t sound_t;<\/code>. You could experiment with some other data types.<\/p>\n<p>To be able to verify the result I used <code>CvsStream&lt;sound_t&gt; printer(Serial, channels);<\/code> which generates CSV output and sends it to Serial.<\/p>\n<pre><code>#include \"AudioTools.h\"\n\nusing namespace audio_tools;  \n\ntypedef int16_t sound_t;                                   \/\/ sound will be represented as int16_t (with 2 bytes)\nuint16_t sample_rate=44100;\nuint8_t channels = 2;                                      \/\/ The stream will have 2 channels \nSineWaveGenerator&lt;sound_t&gt; sineWave(32000);                \/\/ subclass of SoundGenerator\nGeneratedSoundStream&lt;sound_t&gt; sound(sineWave, channels);   \/\/ Stream generated from sine wave\nCvsStream&lt;sound_t&gt; printer(Serial, channels);              \/\/ ASCII stream \nStreamCopy copier(printer, sound);                         \/\/ copies sound into printer\n\n\/\/ Arduino Setup\nvoid setup(void) {  \n  \/\/ Open Serial \n  Serial.begin(115200);\n\n  \/\/ Setup sine wave\n  sineWave.begin(sample_rate, B4);\n}\n\n\n\/\/ Arduino loop - repeated processing \nvoid loop() {\n  copier.copy();\n}\n<\/code><\/pre>\n<p>Here is the result on the Arduino Serial Plotter:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.pschatzmann.ch\/wp-content\/uploads\/2021\/05\/serial-plotter-sine-300x146.png\" alt=\"\" width=\"300\" height=\"146\" class=\"alignnone size-medium wp-image-3089\" srcset=\"https:\/\/www.pschatzmann.ch\/wp-content\/uploads\/2021\/05\/serial-plotter-sine-300x146.png 300w, https:\/\/www.pschatzmann.ch\/wp-content\/uploads\/2021\/05\/serial-plotter-sine-768x374.png 768w, https:\/\/www.pschatzmann.ch\/wp-content\/uploads\/2021\/05\/serial-plotter-sine.png 1159w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Im my last couple of Blogs, I have demonstrated how we can use the low level API of my Arduino Audio Tools library. Currently I am busy working on a high level API using Arduino Streams. I did not commit my latest changes yet but I want to take the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3089,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[20,22],"tags":[],"class_list":["post-3088","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-machine-sound"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Stream support for my \u201cArduino Audio Tools\u201d Library - A Sound Generator - Phil Schatzmann<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pschatzmann.ch\/home\/2021\/05\/04\/stream-support-for-the-arduino-audio-tools-library-sound-generator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Stream support for my \u201cArduino Audio Tools\u201d Library - A Sound Generator - Phil Schatzmann\" \/>\n<meta property=\"og:description\" content=\"Im my last couple of Blogs, I have demonstrated how we can use the low level API of my Arduino Audio Tools library. Currently I am busy working on a high level API using Arduino Streams. I did not commit my latest changes yet but I want to take the [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pschatzmann.ch\/home\/2021\/05\/04\/stream-support-for-the-arduino-audio-tools-library-sound-generator\/\" \/>\n<meta property=\"og:site_name\" content=\"Phil Schatzmann\" \/>\n<meta property=\"article:published_time\" content=\"2021-05-04T11:03:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-05-04T11:09:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.pschatzmann.ch\/wp-content\/uploads\/2021\/05\/serial-plotter-sine.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1159\" \/>\n\t<meta property=\"og:image:height\" content=\"564\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"pschatzmann\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"pschatzmann\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2021\\\/05\\\/04\\\/stream-support-for-the-arduino-audio-tools-library-sound-generator\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2021\\\/05\\\/04\\\/stream-support-for-the-arduino-audio-tools-library-sound-generator\\\/\"},\"author\":{\"name\":\"pschatzmann\",\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/#\\\/schema\\\/person\\\/73a53638a4e34e8373405fd737dac9b1\"},\"headline\":\"Stream support for my \u201cArduino Audio Tools\u201d Library &#8211; 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