Abstract:
The C8051F411 offers a
versatile, small (5 x 5 mm), highly integrated, low-power solution for voice
applications. The 12-bit ADC and DAC allow for reasonable quality sound at a 8
kHz sampling rate, and the hardware Accumulation and Burst Mode features of the
ADC provide for further improvements with small processing tradeoffs. The
Suspend mode operating feature allows the voice recorder to “sleep” while idle,
saving power in a similar fashion to the traditional 8051 Stop mode, but still
allows the recorder to wake and respond to the user without a hardware reset.
This document describes the solution for a telephone-quality voice recorder
using the C8051F411.
This document includes
the following:
- A description of the system hardware and software
- Usage notes and customization considerations
- A schematic, bill of materials, and detailed layout diagrams
- The implementation of the software showing how to sample, compress, store, and play back a voice signal
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