Speech Frequency Spectrogram
See your voice as a scrolling spectrogram — frequency content over time, with brighter colour for stronger energy. Watch vowels, formants, and consonant bursts appear in real time.
ℹ This is a spectrogram — a picture of frequency vs. time from an FFT. It does not recognise words or label phonemes (that needs speech recognition). The vertical axis is logarithmic over your chosen range. To save an image, use your device’s screenshot. Your mic is analyzed live and never recorded or uploaded.
Time flows left → right (newest at the right edge). Vertical = frequency (log). Bright bands are formants; vertical streaks are consonant bursts.
How It Works
Many times a second, the tool runs a Fast Fourier Transform (FFT) on the latest slice of your microphone signal, giving the energy at each frequency. It paints that as a vertical column of coloured pixels — low frequencies at the bottom, high at the top on a logarithmic scale — and scrolls the image left so a continuous spectrogram builds up over time. Brighter pixels mean more energy. In speech you’ll see horizontal bands (the formants that shape vowels), a striped low region (the voice’s harmonics), and brief vertical smears for plosives and the high fuzz of fricatives like “s” and “sh”. Everything runs live on your device; nothing is recorded.
A spectrogram shows sound; it doesn’t read it. This tool does not transcribe words or tag phonemes — that’s speech recognition, a different problem. Use it to study how vowels and consonants look, to compare your speech or singing over time, or to spot a nasal or breathy quality. The picture also depends on your microphone’s response and the room.