signal op• 資料種類:signal → measurement
• 呼叫: import fullseye as fs; fs.ledger.zero_crossing_rate(x)(要直接呼叫實作,import dsp; dsp.zero_crossing_rate(x);從台帳取用則 ops1d.get("zero_crossing_rate"))
相鄰樣本中符號改變的比例——廉價的音高/雜訊程度線索。
> 以下的詳細說明為原文 —— 摘要與標題已翻譯。
Exact zeros are neither a crossing nor a sign: a crossing is counted only when the sign changes between consecutive *non-zero* samples, and the rate divides by the number of adjacent sample pairs len(x) - 1. So [1, 0, 1, 0, 1] is 0.0 and [1, 0, -1] is 0.5 (before 2026-09-02 diff(sign(x)) counted every touch of zero as a crossing: 1.0 for both).
Empty input (x with 0 elements) raises ValueError.
• 範例資料目錄(下載 URL / 授權) —— 2-D 用 skimage.data(BSD/公有領域)加合成圖,3-D 給出真實資料源(Stanford/PDS 等)的下載 URL。
• 運算子來歷與參考文獻 —— 該運算子族所依據的研究/方法出處。
• 演算法的正典(作者、年份)與用途見上面的族使用指南。
• gallery_oned_audio_funct — py -3.11 examples/gallery_oned_audio_funct.py
• gallery_spectrum_signal_bridge — py -3.11 examples/gallery_spectrum_signal_bridge.py
measurement 作為輸入)—
signal)lowpass · highpass · bandpass · envelope · rms · local_std · quantize · companding_mu_law
*Provenance: dsp.py — ONED 運算子登記表。本條目由 tools/opdocs.py md 自動產生(請勿手動編輯)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.