expand acronym pcm

2022/audio-2022.html

@@ -153,7 +153,8 @@ <h1 id="title"><i class="todo">PROPOSED</i> Audio Working Group Charter</h1>
         </p>
 
         <p>
-          The audio API provides methods to read audio samples, write audio data, create sounds, and perform client-side audio processing and synthesis with minimal latency. It also adds programmatic access to the PCM audio stream for low-level manipulation
+          The audio API provides methods to read audio samples, write audio data, create sounds, and perform client-side audio processing and synthesis with minimal latency. It also adds programmatic access to the
+          <abbr title="Pulse Code Modulation">PCM</abbr> audio stream for low-level manipulation
           directly in script. This API can be used for interactive applications, games, 3D environments, musical applications, educational applications, and for the purposes of accessibility. It includes the ability to synchronize, visualize, or
           enhance sound information when used in conjunction with graphics APIs. Sound synthesis can be used to enhance user interfaces, or produce music. The addition of advanced audio capabilities to user agents presents new options to Web developers
           and designers, and has many accessibility opportunities and challenges that this working group will continue to keep in mind.