level opsignal → tableimport fullseye as fs; fs.ledger.percentile_level(x, rate, percentiles=(10.0, 50.0, 90.0), weighting='A', ref=1.0, window_s=0.125, floor_db=-200.0) (実装を直接呼ぶなら import acoustics; acoustics.percentile_level(x, rate, percentiles=(10.0, 50.0, 90.0), weighting='A', ref=1.0, window_s=0.125, floor_db=-200.0)、台帳から引くなら opsacoustics.get("percentile_level"))Statistical levels: L_N is the level exceeded N % of the time.
The record is cut into non-overlapping blocks of window_s seconds, each
block’s equivalent level is computed, and L_N is the (100-N)-th
percentile of those levels. Non-overlapping rectangular blocks are used
rather than an exponential time weighting because the block length is then
exactly what the caller asked for and the statistic is exactly a percentile
of the returned levels array — an exponential average would make the
effective averaging time a function of the signal.
Returns a dict with one key per requested percentile ("L10", "L50",
"L90", formatted with %g), plus levels (the per-block levels),
times (block start times, s), n_blocks, block_samples,
leq (the energy-equivalent level of the whole record), ref,
weighting.
Note that L50 is the median level and leq is the energy level;
they are different numbers whenever the signal is not stationary, and the
gap between them is itself the usual measure of how fluctuating a record is.
Measured on a two-level test signal (1 s at 16 kHz, first half a 1 kHz sine
of amplitude 1.0, second half the same at 0.1, Z-weighted, 0.125 s blocks,
8 blocks): L10 = -3.010300 and L90 = -23.010300 dB — exactly the two
constituent levels, 20.000000 dB apart, as they must be for a 50/50
split. L50 = -13.010300 is the interpolated midpoint of the two clusters
and leq = -5.977386, which is 17 dB above L90: the energy level sits
near the loud half while the median sits between them. On a
constant-amplitude signal all three percentiles and leq agree to
3.6e-15 dB.
Raises ValueError: everything :func:_as_signal refuses, a
percentile outside [0, 100], a non-positive window_s, a window_s
longer than the record (which would give one block and make every percentile
the same number while still looking like a statistic), ref <= 0.
py -3.11 examples/acoustic_condition_monitoring.pytable を入力に取れる)level)octave_bands · octave_spectrum · weighting_response · apply_weighting · equivalent_level
Provenance: acoustics.py — ACOUSTICS operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.