頻率分析儀

查看麥克風輸入或音訊檔案的頻譜，並顯示主導頻率和最接近的音名。

This browser does not provide the Web Audio API, so the analyzer cannot run.

使用方法

In microphone mode, press Start microphone, allow access, and make a sound.
In file mode, choose an audio file and press Play.
The spectrum (logarithmic frequency axis), the dominant frequency and the nearest musical note are shown.

注意事項

Analysis runs on your device with the Web Audio AnalyserNode (FFT size 8192). The microphone is released as soon as you stop, and files are decoded locally, never uploaded. The dominant frequency is the strongest FFT bin; for sounds rich in harmonics it may be a harmonic rather than the fundamental.

常見問題

What does the cents value mean?: It is the deviation from the nearest note; 100 cents equals one semitone. A plus means the sound is sharper than the note, a minus flatter. A4 = 440 Hz is the reference.
Why are very low notes hard to read?: FFT resolution and the microphone's own low-frequency sensitivity are the limits; below about 50 Hz the reading becomes unstable.