🔊 分频点（示意）Crossover Frequency (demo)

使用说明与常见问题How-to & FAQ

「分频点（示意）」是什么？What is the Crossover Frequency (demo) tool?

一阶 RC：f_c = 1/(2π R C)；也可由目标 f 反推 C。本地处理。可设置「计算」、「电阻 Ω」、「电容 F」、「目标频率 Hz」。First-order RC: f_c = 1/(2π R C); or solve C from target f. Processed locally. Settings: Solve, Resistance Ω, Capacitance F, Target Hz.

如何使用「分频点（示意）」？How do I use the Crossover Frequency (demo) tool?

在「分频点（示意）」中，填写「计算」、「电阻 Ω」、「电容 F」、「目标频率 Hz」等参数，结果会随输入实时计算并显示在下方。In the Crossover Frequency (demo): Fill in "Solve", "Resistance Ω", "Capacitance F", "Target Hz"; results are recalculated instantly as you type.

高通和低通怎么区分？How do high-pass and low-pass differ?

一阶 RC 的截止频率公式相同 f_c = 1 ÷ (2πRC)，区别只在接法：电容串在信号路径上是高通（给高音），电容并在输出到地是低通（给低音）。本页可由 R、C 求 f_c，或由目标频率反求 C。A first-order RC filter uses the same cutoff f_c = 1 ÷ (2πRC) either way; only the wiring differs: a series capacitor makes a high-pass (tweeter), a capacitor to ground makes a low-pass (woofer). This page finds f_c from R and C, or C from a target frequency.

能举个计算实例吗？Can you show a worked example?

例如在「分频点（示意）」中填 计算 = 求截止频率，电阻 Ω = 8000，电容 F = 1e-8，结果区显示：f_c Hz：1,989.4368For example, entering Resistance Ω = 8000, Capacitance F = 1e-8 in the Crossover Frequency (demo) gives: f_c Hz: 1,989.4368

哪些输入会被检查？Which inputs are validated?

「分频点（示意）」会检查这些输入——「电阻 Ω」、「电容 F」、「目标频率 Hz」：必须填写，须大于 0；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Crossover Frequency (demo) checks its inputs — "Resistance Ω", "Capacitance F", "Target Hz": required, must be greater than 0; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「分频点（示意）」的设置：「计算」可选 求截止频率、求电容（默认 求截止频率）；「电阻 Ω」默认 8000；「电容 F」默认 1e-8；「目标频率 Hz」默认 2000。每次生成结果都按当前设置处理。Settings in the Crossover Frequency (demo) — "Solve": 2 choices; "Resistance Ω" default 8000; "Capacitance F" default 1e-8; "Target Hz" default 2000. The result always uses the current settings.

计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?

「分频点（示意）」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Crossover Frequency (demo) uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.

「分频点（示意）」免费吗？需要注册吗？Is the Crossover Frequency (demo) free? Do I need an account?

「分频点（示意）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Crossover Frequency (demo) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.