diff options
Diffstat (limited to 'tests/circuitpython-manual/audiobusio/pdmin_rms.py')
| -rw-r--r-- | tests/circuitpython-manual/audiobusio/pdmin_rms.py | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/tests/circuitpython-manual/audiobusio/pdmin_rms.py b/tests/circuitpython-manual/audiobusio/pdmin_rms.py index 8d1595752..53a6fea15 100644 --- a/tests/circuitpython-manual/audiobusio/pdmin_rms.py +++ b/tests/circuitpython-manual/audiobusio/pdmin_rms.py @@ -8,19 +8,18 @@ import math trigger = digitalio.DigitalInOut(board.D4) trigger.switch_to_output(True) + def mean(values): return sum(values) / len(values) def normalized_rms(values): minbuf = int(mean(values)) - samples_sum = sum( - float(sample - minbuf) * (sample - minbuf) - for sample in values - ) + samples_sum = sum(float(sample - minbuf) * (sample - minbuf) for sample in values) return math.sqrt(samples_sum / len(values)) + # signed 16 bit s16 = array.array("H", [0] * 10000) |