Package content and description

AN4229

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DocID024112 Rev 1

Figure 7. Player process (triple-buffering mode)

2.3.2

Audio recorder

Audio Recorder Buffering task consists on getting the recorded frame from the ADC

peripheral then encode it and write it to mass storage device. ADC conversion is triggered

by a timer. Once a buffer is ready, the recorder task is notified and gets the ready buffer for

encoding and writing.

As shown in Figure 8, double buffering is used for this module.

Figure 8. Recorder process (double-buffering mode)

2.4

Software

In addition to the firmware described above, the vocoders package includes also four

software applications (PC applets) that allow the user to encode and decode audio files on

the PC with the different voice codecs.