synthesis op• データ種: なし → table(引数だけで決まる op —— 画像やデータの入力を取らない)
• 呼び出し: import acoustics; acoustics.synthesize_speed_ramp(rate=5000.0, duration=4.0, rpm_start=600.0, rpm_end=1800.0, orders=(1.0, 3.5), amplitudes=None, resonance_hz=None, noise_sigma=0.0, seed=None) (または opsacoustics.get("synthesize_speed_ramp"))
回転上昇: 軸次数に固定した成分(必要なら 1 本だけ Hz 固定)。
> 以下の詳細説明は原文のままです —— 要約と見出しは訳出済み。
Order tracking has no meaning at constant speed, so its ground truth needs a
signal whose shaft rate moves. Here the shaft rate ramps linearly from
`rpm_start to rpm_end` and each component's instantaneous phase is
`2 pi * order * revolutions(t)` — so it is locked to the shaft *exactly*,
by construction, and its order is known to machine precision.
`resonance_hz` adds one component at a fixed frequency instead. That is
the discriminating case: after angular resampling an order stays put and a
resonance smears, which is the whole diagnostic value of the transform.
Returns a dict, because a speed record without its speed profile is not
analysable: `signal (the waveform), rpm` (per-sample shaft rate),
`revolutions (cumulative, per-sample), rate, duration`,
`orders, total_revolutions, resonance_hz`, and
`max_component_hz`.
Raises `ValueError`: non-real / string / bool scalars, non-positive
`rate / duration / rpm_start / rpm_end`, an empty or non-finite
`orders, an amplitudes` of the wrong length, a length over
:data:MAX_SAMPLES, and **any component reaching Nyquist at the fastest
point of the ramp** — checked at `max(rpm)`, not at the mean, because a
ramp that is legal on average can alias at its top end and produce a
perfectly plausible spectrum.
• acoustic_condition_monitoring ファミリ ガイド
• サンプルデータ カタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。
• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。
• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。
• acoustic_condition_monitoring — py -3.11 examples/acoustic_condition_monitoring.py
table を入力に取れる)synthesis)*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.