山东墨龙：国际原油市场价格波动短期内对公司业绩暂无实质性利好
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This approach works because even during continuous fast speech, the energy envelope oscillates between syllable nuclei (vowels, high energy) and inter-syllabic transitions (consonants, lower energy). The high-pass filter extracts this oscillation regardless of absolute level, and zero-crossing counting is inherently robust to amplitude variations.