六个小单位，
怎样成为拍？Six small units.
How do they form beats?
把同样长的六个八分音符分成两组或三组。小单位的速度不变，感受到的拍却不同。Group six equal eighth notes into two groups or three. Keep the small units at the same speed; the beat changes.
先猜：两种分组的一小节会一样长吗？每分钟的拍数也一样吗？Predict first: will the bars last equally long? Will the beats per minute also match?
只改分组，先不改速度Change grouping before speed
输入60–240的整数。此数值数的是八分音符，不是自动把它叫作一拍。Enter an integer from 60–240. This counts eighth notes; it does not automatically call each one a beat.
第1拍 / Beat 1
第2拍 / Beat 2
从左向右经过相同时间。边框围成一拍；数字数小单位；▲只标当前观察位置。Equal time passes from left to right. Each border encloses one beat; numbers count small units; ▲ marks the current position.
第1小单位 · 第1拍 · 拍内第1小单位 / Unit 1 · Beat 1 · Division 1
这是无声音、手动步进的时间示意，不是节拍器。按钮点击的间隔不代表音乐时值。This is a silent, manually stepped time model, not a metronome. Time between clicks is not musical duration.
为什么结果不同？Why do the results differ?
6/8在此按三个八分音符组成一拍，所以一小节有两拍；3/4按两个八分音符组成一拍，所以有三拍。一个附点四分音符等长于三个八分音符，一个四分音符等长于两个。Here 6/8 groups three eighth notes into each beat, giving two beats per bar. 3/4 groups two eighth notes per beat, giving three. A dotted quarter lasts three eighth notes; a quarter lasts two.
| 拍号Time signature | 小单位分组Unit groups | 拍 / 分钟Beats / minute | 秒 / 小节Seconds / bar |
|---|---|---|---|
| 6/8 | 123 | 456 | 40 | 3 |
| 3/4 | 12 | 34 | 56 | 60 | 3 |
查看计算与适用边界Calculation and limits
每分钟有u个八分音符时，一个小单位为60/u秒，一小节为6×60/u秒；6/8的拍速为u/3，3/4为u/2。结果保留最多3位小数，内部计算不取整。模型采用常见分组，固定等长小单位，不表示所有风格的重音、速度变化或演奏处理。At u eighth notes per minute, one unit lasts 60/u seconds and a bar 6×60/u seconds. Beat rates are u/3 in 6/8 and u/2 in 3/4. Outputs show up to 3 decimals; calculations are not rounded internally. The model uses common groupings and equal units, not every style's accents, tempo changes or performance choices.
回到[E13]：先均匀敲六下，再分别强调第1、4下与第1、3、5下。听到重音，并不足以单独证明一首作品的拍号。Return to [E13]: tap six equal sounds, emphasizing units 1 and 4, then units 1, 3 and 5. Accents alone do not establish a work's time signature.