RXC-3000
Hardware Installation and User Guide
9000-0000-040 Revision 10
42 of 46
Genave Electronics
ADPCM Audio Player
How Sound Files Are Played To The PA
Port
When the RXC-3000 runs a script, if it has been told
to play a song/sound file, it turns on the ADPCM
player and tells the player the file number of the song/sound it is to play. The player automatically
selects the file from the TF card and begins playing. At the same time, the RXC-3000 un-mutes the
corresponding audio amplifiers and the external PA amplifier circuits.
How The RXC-3000 Knows What AudioTo Play
Each audio sound file in the TF card has a specific address. The address starts at 0000.ad4 and can go
to 0098.ad4. The very first audio file (0000.ad4) is never used. It is simply a place holder in the TF
card.
Here is how the memory in the TF card looks like to the RXC-3000:
0000.ad4
Empty file, never used
0001.ad4
Audio #1 (first useable file)
0002.ad4
Audio #2
0003.ad4
Audio #3
etc.........
0098.ad4
Audio #100 (last useable file)
When the RXC-3000 runs a script, if the text “Play 0006;” is in the script, the RXC-3000 will
command the ADPCM unit to play audio #6. There are two ways that the audio will end or stop. The
first way is for the ADPCM to come to the end of the song, at which time it will tell the RXC-3000 that
the audio is done. The second way is for a new script to have the text “Play 0000;” the RXC-3000 will
command the ADPCM module to stop all play functions.
Adjusting Audio Levels
The output level is adjusted using dedicated pot, R5, on the module. Begin playing the audio file and
adjust to the appropriate level.
Creating ADPCM Files From .wav, Etc...
The ADPCM audio player can only play files that are compressed into a 4 bit ADPCM format (.ad4).
Genave supplies a program that converts files from .wav formats into the .ad4 format.
R5 VOL