PSB4860HV4.1 Lantiq, PSB4860HV4.1 Datasheet - Page 80

• Manufacturer Part Number: PSB4860HV4.1
• Manufacturer: Lantiq

Specifications of PSB4860HV4.1

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Data Sheet
Figure 44 illustrates the basic structure of the voice prompt directory.
Figure 44 Memory Management - Structure of Voice Prompt Directory
The voice prompt directory contains 254 file descriptors. To each file descriptor a voice
prompt file can be attached. The file with number 255 is a special file. If this file is
selected, up to 2048 phrases can be used.
The directories must be created after each power failure for volatile R/W-memory. All file
descriptors are cleared (all words zero). For non-volatile memory, the directories have to
be created only once. If the directories already exist, the memory just has to be activated
after a reset. The file descriptors are not changed in this case.
For detailed information on the structure of the directories, please refer to the appropriate
application note.
2.2.1
A file is a linear sequence of units and can be accessed in two modes: binary and audio.
In binary mode, a unit is a word (16 bits). In audio mode, a unit is a variable number of
words representing 30 ms of uncompressed speech. A file can contain at most 65535
units. Figure 45 shows an audio file containing 100 audio units. The length of the
message is therefore 3 s.
Figure 45 Audio File Organization - Example
File Definition and Access
0
directory
Hi Jack, this is Tom. Please call me back tomorrow.
file descriptor 254
phrase selected
file descriptor 1
file descriptor n
80
3 s
phrase 2048
phrase 0
PSB 4860
2000-01-14
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