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Audio Description Examples

Our audio description services utilize human describers and synthesized speech. You can hear examples of our services below! We’ve published audio description in several ways, so you can see how our various output formats work.

You can view the following examples of audio description below:

  • Audio Description Plugin: Our plugin allows you to add description to videos on players that don’t otherwise support it.
  • MP4 Video with Audio Description: These examples show MP4 videos that contain both the source audio and the audio description.
  • Merged Transcript & Description: This example shows a video along with a merged text document containing both the transcript and the description, which is the best accommodation for deaf/blind viewers.

Audio Description PluginJump to Top

Our audio description plugin allows you to add description to videos hosted on players that don’t support description – even to videos you don’t own. In this example, we’ve added the audio description plugin to a YouTube video embed from MITK12Videos to make it accessible without republishing their video. Test it out:



Instructions:

  1. Press play on the video.
  2. Press the AD icon to turn description on and off.
  3. Press the AD sliders icon to equalize the volume
  4. Press the AD volume icon to mute AD
  5. Use the AD volume slider to change the volume of your description independently from the volume of your YouTube video.

MP4 Video with Audio DescriptionJump to Top

Most video players don’t support the use of a secondary audio track or video source associated with your original video. If you don’t want to use the plugin above, you can publish a second video with audio description. Note that you won’t be able to turn audio description off.

The below examples show MP4 videos that include the source audio and audio description.

Merged Text DocJump to Top

A merged text output that contains both the transcript and description is the best accommodation for deaf/blind viewers. Below, you can view an example of a video playing with audio description and captions alongside a merged text document.

(SPEECH)
Let me show you a quick demo.

(DESCRIPTION)
Draws diagram.

(SPEECH)
What I'm going to show you is a signal feeding an AND gate. And one signal is going to look like this.

(DESCRIPTION)
Labels X.

(SPEECH)
And my signal y is going to look like this.

(DESCRIPTION)
Y below X.

(SPEECH)
OK, so you expect a processed output. So the 0-- I'm sorry, 1, 0, 1, 0, 1, 0, 1. And the output is simply going to be-- this is my time axis going this way. It's going to be an ANDing of these two signal values like so.

What I'm also going to show you is I'm going to superimpose noise on this wire.

(DESCRIPTION)
Zigzags on a smooth line.

(SPEECH)
I'm going to superimpose noise on the wire. And what I want you to observe is the output of this digital gate. The output will stay exactly like this, even though I impose noise, the ultimate test. So stay right there. Let's do this demo. Give me a couple seconds.

(DESCRIPTION)
Instructor leaves the lecture hall.

Fade to black. Later. A cameraman is at the front of the room.

(SPEECH)
[MUSIC - WILL SMITH, "MEN IN BLACK"]

(DESCRIPTION)
The instructor and another man enter carrying chainsaws.

(SPEECH)
(SINGING) Here come the Men in Black.

[LAUGHTER]

(DESCRIPTION)
They wear black suits and sunglasses.

(SPEECH)
It's the MiBs. Uhh, here come the MiBs.

Here come the Men in Black. They won't let you remember.

Nah, nah, nah. The good guys dress in black. Remember that.

[LAUGHTER]

(DESCRIPTION)
They begin a synchronized dance.

(SPEECH)
[CHEERS AND APPLAUSE]

(DESCRIPTION)
The instructor puts his foot on the desk to hold down a metal case and presses the chainsaw to it.

(SPEECH)
[CHAINSAW BUZZING]

[LAUGHTER]

[CHAINSAW BUZZING]

(DESCRIPTION)
He looks at the projection screen on the side of the classroom. It displays three lines with different sized, squared-off wave forms. The middle line is jagged and vibrating when the chainsaw runs.

(SPEECH)
[APPLAUSE]

So if you look at the signal up there--

[LAUGHTER]

[CHAINSAW BUZZING]

Look at the middle wave form. And I'm imposing-- you know, let's have a digital system in a noisy environment, like a lumberyard, for example, or chopping a bunch of trees in my backyard, building digital systems on the side.

[CHAINSAW BUZZING]

And you know, if I have my buddies, you know, revving up chainsaws, you know, I'm superimposing noise on my--

[CHAINSAW BUZZING]

--second input. But look at the output.

[CHAINSAW BUZZING]

And just to show that I'm not bluffing here, what I'll do is I'll pass the noise through and make the noise larger. And you'll notice that, when the noise begins to surpass the noise margins, the output begins to go berserk. Watch. Can you increase it gradually?

[CHAINSAW BUZZING]

(DESCRIPTION)
The vibrations on the middle line become much more jagged.

(SPEECH)
So notice that, as I put in a lot more noise, then the output begins to--

[CHAINSAW BUZZING]

--go berserk. But as long as my input is within the noise margin, my output stays perfectly stable. So that's the intro to digital systems. You'll see numbers in recitation. And we'll see you in lecture on Tuesday.

[APPLAUSE]

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