In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:

Hi Genuises,

I am trying to get a SX52 to act as a "soft voice switch" for a small keyphone system project ( 2 lines 6 extensions ).
This SX should run at 75Mhz and run ADCs to sample voice on one ext and send it to play at the other ext by PWM and vice versa.
I plan to allow 3 simultaneous pairs of conversations at any 1 time.  ( 3 virtual buses )

That means I need 8 pairs of ADC's and PWMs for all the 8 ports of the keyphone, though not all wiil be running simultaneously.
I am planning to use the usual  2 pin calibrating method for the ADC, no ADC chips.
I am also planning to use op amp low pass filters to smooth out the voice sampling and playback.

My questions are, 
1. Is the SX fast enough for this job?
2. Will the sound quality be acceptable?
3. Will there be problems with echo if I don't use hybrid circuits?
4. Is this project overly ambitious?

Thanks.

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