▲ Solution ContentCopy

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"paragraph", "children": [ { "type": "span", "marks": [ "strong" ], "value": "Z-计权" }, { "type": "span", "value": " 在所有频率上都是线性的，对所有测量值都有相同的影响。" } ] } ] } ] } ] } }, "blocks": [], "links": [] }, "images": [ { "responsiveImage": { "aspectRatio": 1, "base64": "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoIDQgSDRYLDQ8NDQ0QDx0JFgcNFxMZGBYVIhUaHysjGh0oHRUiJDUlKC0vMjIyGSI4PTcwPCsxMi8BCgsLBQUFEAUFEC8cFhwvLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vL//AABEIABgAGAMBIgACEQEDEQH/xAAYAAEBAAMAAAAAAAAAAAAAAAAABQEDB//EAB4QAAMAAgMAAwAAAAAAAAAAAAABAwIEESEyBRMU/8QAFQEBAQAAAAAAAAAAAAAAAAAAAAL/xAAUEQEAAAAAAAAAAAAAAAAAAAAA/9oADAMBAAIRAxEAPwDqVc4yt6NVNqX2Lsn7WvbPZS5MV+Pr0+SkqyzjVegT9XTqn6AFCkn+hMxZZPJIADZjLPFcgAD/2Q==", "height": 800, "sizes": "(max-width: 800px) 100vw, 800px", "src": "https://www.datocms-assets.com/53444/1653984901-sound-level-meter-frequency-weighting-curves.png?auto=format&fit=max&w=800", "srcSet": 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"id": "121950104", "anchor": "averaging", "video": "https://youtu.be/CQHuUxO3VWk", "content": { "value": { "schema": "dast", "document": { "type": "root", "children": [ { "type": "heading", "level": 2, "children": [ { "type": "span", "value": "平均计算类型" } ] }, { "type": "paragraph", "children": [ { "type": "span", "value": "在倍频程分析中，使用平均值来获得更稳定的结果。有三种平均值的计算模式：" } ] }, { "type": "list", "style": "bulleted", "children": [ { "type": "listItem", "children": [ { "type": "paragraph", "children": [ { "type": "span", "marks": [ "strong" ], "value": "线性平均:" }, { "type": "span", "value": " 每次FFT都参与计算平均" } ] } ] }, { "type": "listItem", "children": [ { "type": "paragraph", "children": [ { "type": "span", "marks": [ "strong" ], "value": "指数平均:" }, { "type": "span", "value": " 随着时间的变化，之前的FFT计算结果的权重变得越来越轻" } ] } ] }, { "type": "listItem", "children": [ { "type": "paragraph", "children": [ { "type": "span", "marks": [ "strong" ], "value": "峰值保持平均:" }, { "type": "span", "value": " 只有各频率点上只保留和显示历次的最大值" } 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"question": "什么是倍频程分析仪？", "answer": "<p>实时倍频程分析仪是一种特殊的声级计，可将噪声分成其频率分量。 电子滤波电路用于将声音或噪声分成单独的频带。</p>\n<p>Dewesoft 为任何声音测量提供灵活的倍频程分析仪。</p>" }, { "question": "什么是恒定百分比带宽 (CPB) 滤波器？", "answer": "<p>CPB 滤波器是一种带宽为中心频率的固定百分比的滤波器。 各个过滤器的宽度是相对于它们在感兴趣范围内的位置来定义的。 滤波器的中心频率越高，带宽越宽。</p>\n<p>使用的最宽倍频程滤波器的带宽为 1 个倍频程。 经常使用许多细分为更小的带宽。 这些过滤器通常被标记为恒定百分比带宽过滤器。</p>\n<p>1/1 倍频程滤波器的带宽接近其中心频率的 70%。 最流行的滤波器可能是那些具有 1/3 倍频程带宽的滤波器。 一个优点是频率高于 500 Hz 的带宽很好地对应于人类听觉系统的频率选择性。<br />Dewesoft CPB 解决方案支持高达 1/24 倍频程的带宽。</p>" }, { "question": "什么是频率加权曲线？", "answer": "<p>人耳在不同频率下没有相同的&ldquo;增益&rdquo;。 我们将在 1 kHz 处感知到相同级别的声压，而在 100 Hz 处响亮。 为了补偿这个&ldquo;误差&rdquo;，我们使用频率加权曲线，它给出了与人耳相同的响应。</p>\n<p>最常见的例子是声级测量中的频率加权，其中一组特定的加权曲线称为 IEC 61672 标准中定义的 A、B、C 和 D 加权。</p>\n<p>未加权的声压测量值与感知响度不对应，因为人耳在太低和太高的频率下不太敏感。 通过使用声级计中的加权滤波器，将曲线应用于测量的声级。</p>" } ], "relatedProducts": [ { "__typename": "ProductRecord", "slug": "mini", "title": "SIRIUS® Mini", "subtitle": "4-通道振动/噪声分析仪", "image": { "url": 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