Every sound is a sum of sine waves. Draw them, play them, watch them turn as circles on circles, and turn them into a lush pad.
每根長條是一個正弦波。在長條上拖曳來畫出它們的電平，或聚焦某根長條後用方向鍵調整（每步 1 dB）。
長條下方的數字：每個分音的頻率是所奏音符的幾倍。刻度從頂部的 0 dB 到 -48 dB。
也可以用下方的琴鍵或電腦鍵盤彈奏 C4 到 C5：A S D F G H J K，黑鍵是 W E T Y U。
每個分音是一個圓：大小等於它的電平，轉速等於它的頻率，並騎在上一個圓上。最後一點的高度隨時間畫在右側，正是你聽到的波形。
把你的分音變成豐滿、無縫循環的鋪底音色：每個分音被抹開成一窄帶隨機相位的頻率（Nasca Octavian Paul 的 PADsynth 演算法），聽起來像一群略有失諧的副本在合唱。
100% 在瀏覽器中執行——你的檔案絕不會離開你的裝置。
Start from a sine, saw, square, triangle, organ or bell, then drag the 16 bars to set how loud each sine wave is. Stretch the ratios to hear harmonic tones turn metallic.
Hold a note or play with your mouse, touch or computer keyboard. Circles on circles, the waveform and the spectrum all redraw from the same partials you hear.
Generate a PADsynth pad from your partials, set its bandwidth, loop it, and download the WAV for any sampler or DAW.
Additive synthesis builds a sound by adding sine waves together. Each sine is a partial: it has a frequency, usually a whole-number multiple of the note (the harmonics), and a level. Fourier showed that any repeating waveform can be written this way, so a saw is every harmonic at 1/k, a square only the odd ones, and a triangle the odd ones at 1/k².
The circles-on-circles picture is the same idea drawn as motion. Every partial is a circle that turns at its own speed while riding on the previous one. The height of the last point is the sum of all the sines, which is why its trace is exactly the waveform. Make one circle larger and you hear that harmonic get louder.
Real instruments are rarely perfectly harmonic. Piano strings are stiff, so their upper partials run slightly sharp; bells and bars have partials at ratios like 2.76 and 5.4. Moving the ratios away from whole numbers is what makes a tone sound metallic. And in most acoustic sounds the high partials die away first, which is what the Pluck switch imitates.
PADsynth, by Nasca Octavian Paul, takes additive synthesis one step further: instead of one exact frequency per partial, it spreads each partial into a narrow band of frequencies with random phases and computes the whole sound with one inverse FFT. The result is a long loop with no audible seam that sounds like an ensemble, ideal for pads and choirs.
One of the sine waves a sound is made of. Partials at whole-number multiples of the note are called harmonics; partials in between are inharmonic and give bells and metal their sound.
At audio speed the fundamental turns hundreds of times per second, far too fast to see. The picture turns the fundamental once every four seconds and keeps every partial at its true ratio, so the shape is the same as in the sound.
It raises every ratio k to the power 1 + stretch. The fundamental stays put and higher partials move further from whole numbers: a little sounds like a piano string, more sounds like a bell or a gong. Negative values pull them flat.
An algorithm by Nasca Octavian Paul, released into the public domain and used in ZynAddSubFX. Each partial becomes a Gaussian band of frequencies with random phases, and one inverse FFT turns that spectrum into a long loop that repeats without a click. The bandwidth slider sets how wide the bands are.
No. The sound, the pictures and the pad are all computed in your browser, and the WAV is saved straight from it.
TuttiDAW has a full set of synths, from FM to wavetable, right in your browser. Free to start.
探索 TuttiDAW：線上音訊工作站，無需註冊即可開始