60 Hz is mot too fast, you could use an ADC and classify the results. Might be that the PSoC3 is not fast enough, a PSoC5 will be. On a PSoC5 1200 interrupts/s is manageable for building average, min and max.
Thanks, but I won't be able to use psoc5. Most of our designs are based off psoc3. What about Sample/Track and hold? Will loose the accuracy?