F6217 I/O module

F6217 I/O module

Technical data of product parameters

A sound objectF6217 is a stream containing sample values that define a sound
to be played through the computer’s speakers. The Sound entry in a sound annotation or sound action dictionary (see Table 8.36 on page 638 and Table 8.58 on
page 664) identifies a sound object representing the sound to be played when the
annotation is activated.
Since a sound object is a stream, it can contain any of the standard entries common to all streams, as described in Table 3.4 on page 62. In particular, if it contains an F (file specification) entry, the sound is defined in an external file. This
sound file must be self-describing, containing all information needed to render
the sound; no additional information need be present in the PDF file.
Sample values are stored in the stream with the most significant bits first (big-endian order for samples larger than 8 bits). Samples that are not a multiple of 8 bits F6217
are packed into consecutive bytes, starting at the most significant end. If a sample
extends across a byte boundary, the most significant bits are placed in the first
byte, followed by less significant bits in subsequent bytes. For dual-channel stereophonic sounds, the samples are stored in an interleaved format, with each F6217
sample value for the left channel (channel 1) preceding the corresponding sample
for the right (channel 2).
To maximize the portability of PDF documents containing embedded sounds, it
is recommended that PDF viewer applications and plug-in extensions support at PDF includes the ability to embed movies within a document by means of movie
annotations (see “Movie Annotations” on page 639). Despite the name, a movie
may consist entirely of sound with no visible images to be displayed on the F6217
screen. The Movie and A (activation) entries in the movie annotation dictionary
refer, respectively, to a movie dictionary (Table 9.30) describing the static characteristics of the movie and a movie activation dictionary (Table 9.31) specifying
how it should be presented.

Product picture display

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