Digital Talking Book - NLS DS1 Manual

General Information
1.4

Digital Talking Book

A digital talking book is composed of a collection of computer files. These files contain the digitized audio content
along with information on the book's structure to permit both random access and linear reading of the material. To
play the book, a compatible player requires information on how all the audio files fit together and the location of the
book structure elements such as parts, chapters, and optionally page numbers.
Digital talking books created for NLS are built to conform to the ANSI/NISO Z39.86-2002 standard. Using the
complete standard, books can be created in many formats such as audio, text, or mixed text and audio. The content of
NLS digital talking books contains only human narrated speech. In the following description of the DTB, only those
parts of the standard relevant to NLS-produced books are described.
1.4.1 Files That Make Up a Typical DTB
File Name
db54321.ppf
db54321.pncx
db54321-01.smil
db54321-02.smil
db54321-01.3gp
db54321-02.3gp
db54321-03.3gp
db54321-04.3gp
db54321-05.3gp
db54321-06.3gp
db54321-07.3gp
db54321ann.3gp
db54321hdgs.3gp
us-nls-db54321.ao
dtbsmil110.dtd
ncx110.dtd
oeb1.ent
oebpkg101.dtd
pdtb_protected.smil
protected.mp3
db54321.ncx
db54321.opf
1.4.1.1 Package File
The Package file contains administrative information about the DTB, the files that compose it, and how these files
interrelate.
The major parts of the Package file are as follows:
•
Package Identity – a unique identifier for the DTB
•
Metadata – Publication metadata (title, author, publisher, etc.)
•
Manifest – A list of files that make up the DTB
•
Spine – An arrangement of files providing a linear reading order
February 2010
Description
Protected Package file (PPF)
Protected Navigation Control file (NCX)
Synchronized Multimedia Integration Language
(SMIL) files
AMR-WB+ files
AMR-WB+ announcement file
AMR-WB+ headings file
Authorization object
contains the symmetric keys for the encrypted files
encrypted in the NLS public key
Document Type Definition file
Document Type Definition file
Entity file
Document Type Definition file
Façade Book SMIL presentation
Façade Book announcement
Façade Book Navigation Control file (NCX)
Façade Book Package file (OPF)
Figure 1-5. Example DTB files
Digital Talking-Book Player
Library Guide
Section 1
Purpose
Book structure
Book navigation
Audio clip organization
Compressed audio
Book protection
Administrative files for
book validation but not
required to play the book
Façade Book
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