The Voice Recorder Reference Design illustrates how to use a C8051F411 for voice application. It is a practical demonstration of C8051F41x high performance analog and CPU throughput capability.
The voice recorder uses DPCM (Differential Pulse Code Modulated) compression to convert 12-bit samples of the ADC and IDAC to 6 bits at an effective sampling rate of 8 kHz. This compression allows for an extended recording time without audibly losing sound quality. Additional ADC features such as Burst Mode and Repeat Count are utilized to improve the quality of the sound samples during the recording process. The C8051F411 Suspend operating mode also allows the voice recorder to reduce power consumption when idle.
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User's Guide
Quick-Start Guide
Voice Recorder Application Note
Software (AN278SW)