4 ms·
Given it's a raspberry pi, you could easily implement the 1 kHz bandpass filter in software, by sampling at a higher frequency and then implementing a discrete-
by wallacoloo 8y ago
Given it's a raspberry pi, you could easily implement the 1 kHz bandpass filter in software, by sampling at a higher frequency and then implementing a discrete-time filter. Just about any microcontroller with an ADC could do that, actually (edit: actually, the raspberry pi doesn't have an ADC - I guess the author is doing that with a discrete ADC?).
- barbegal 8y agoThe problem is that most micro-controller ADCs use sample and hold with a capacitor so they require some time to stabilise. From the source code of other projects this seems to be on the order of 1 to 5ms which effectively turns it into a low pass filter.