Dr. Dobb's is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.


Channels ▼
RSS

Database

Algorithm Alley

By Tim Kientzle, November 01, 1997

In this month's column, Tim goes inside the IMA ADPCM audio-compression format and examines how it is implemented by Microsoft and Apple.
Dr. Dobb's Journal November 1997: Inside IMA ADPCM

Inside IMA ADPCM

By Tim Kientzle

Dr. Dobb's Journal November 1997 

static const int indexAdjustTable[16] = {
   -1, -1, -1, -1,  // +0 - +3, decrease the step size
    2, 4, 6, 8,     // +4 - +7, increase the step size
   -1, -1, -1, -1,  // -0 - -3, decrease the step size
    2, 4, 6, 8,     // -4 - -7, increase the step size
};

Example 2: Adjusting the step size.

Copyright © 1997, Dr. Dobb's Journal



Previous 1 2 3 4 5 Next

Related Reading

News

Commentary

Slideshow

Video

Most Popular

More Insights

White Papers

More >>

Reports

More >>

Webcasts

More >>
INFO-LINK




Currently we allow the following HTML tags in comments:

Single tags

These tags can be used alone and don't need an ending tag.

<br> Defines a single line break

<hr> Defines a horizontal line

Matching tags

These require an ending tag - e.g. <i>italic text</i>

<a> Defines an anchor

<b> Defines bold text

<big> Defines big text

<blockquote> Defines a long quotation

<caption> Defines a table caption

<cite> Defines a citation

<code> Defines computer code text

<em> Defines emphasized text

<fieldset> Defines a border around elements in a form

<h1> This is heading 1

<h2> This is heading 2

<h3> This is heading 3

<h4> This is heading 4

<h5> This is heading 5

<h6> This is heading 6

<i> Defines italic text

<p> Defines a paragraph

<pre> Defines preformatted text

<q> Defines a short quotation

<samp> Defines sample computer code text

<small> Defines small text

<span> Defines a section in a document

<s> Defines strikethrough text

<strike> Defines strikethrough text

<strong> Defines strong text

<sub> Defines subscripted text

<sup> Defines superscripted text

<u> Defines underlined text

Dr. Dobb's encourages readers to engage in spirited, healthy debate, including taking us to task. However, Dr. Dobb's moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing or spam. Dr. Dobb's further reserves the right to disable the profile of any commenter participating in said activities.

 
Disqus Tips To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.
 

Database Recent Articles

Most Popular

Stories Blogs

Upcoming Events



Most Recent Premium Content

Digital Issues