Find Out What Note You’re Singing
Have you ever held a note and wondered exactly which pitch it is? VocalCheck’s real-time pitch detector shows you the note name, octave, and frequency the instant you sing.
This is useful for:
- Checking your pitch accuracy against a reference note
- Identifying the notes in a melody you’re learning by ear
- Exploring your range note by note
- Ear training — singing a note and confirming what you intended to sing
How to Use the Real-Time Note Detector
- Open VocalCheck and allow microphone access
- Click the microphone button to start pitch detection
- Sing any note — the detector shows the note name in real time
- Sustain the note to confirm the reading (brief notes may not register clearly)
- The indicator turns green when the pitch is stable and detected
The display shows:
- Note name (e.g., G3, A4, C5)
- Octave number (which helps distinguish G2 from G3)
- Frequency in Hz (optional — for the technically curious)
Understanding Note Names and Octaves
Musical notes use letters A through G, with sharps (♯) and flats (♭) for the half-steps between them. The octave number tells you which version of that note you’re on:
| Note | Frequency |
|---|---|
| C2 | 65 Hz |
| C3 | 131 Hz |
| C4 (middle C) | 262 Hz |
| A4 (concert pitch) | 440 Hz |
| C5 | 523 Hz |
| C6 | 1,047 Hz |
Higher octave numbers mean higher pitches. Most singing voices span two to three octave numbers.
Why Real-Time Pitch Detection Matters
For Learning Songs by Ear
If you’re trying to learn a song without sheet music, singing phrases and checking which notes you’re hitting is an efficient way to map out the melody. VocalCheck shows you the note name as you hold each pitch, letting you transcribe melodies quickly.
For Pitch Training
One of the most effective pitch training exercises is “hear it, sing it, confirm it”:
- Play a note on a piano or recording
- Try to sing the same note by ear
- Check VocalCheck to confirm whether you matched it
Repeating this exercise across many notes gradually trains your ear to recognize and reproduce specific pitches accurately.
For Understanding Your Voice
Many singers describe their voice in vague terms (“I’m sort of a mid-range voice”). Real-time pitch detection gives you exact data. You can discover precisely which notes feel easy and resonant, where your break (passaggio) occurs, and which notes require more effort.
How Pitch Detection Works
VocalCheck uses the Web Audio API to capture your voice through the browser microphone. The audio is analyzed using an autocorrelation algorithm:
- Sampling: Your voice is captured at up to 44,100 samples per second
- Windowing: A short frame of audio (typically 20–100 ms) is isolated for analysis
- Autocorrelation: The algorithm looks for repeating patterns in the waveform — the period between repetitions corresponds to the fundamental frequency
- Note mapping: The frequency is compared to the standard equal-temperament scale to find the closest note
The entire process happens in milliseconds, enabling real-time display. All processing occurs locally in your browser — no audio is sent to any server.
Factors That Affect Accuracy
Background noise — steady noise (fans, music) can confuse the detector. A quiet room gives the best results.
Breath noise — very breathy tones (especially at the start of a note) may cause momentary inaccuracies before the voice settles.
Vibrato — fast vibrato may cause the detected note to fluctuate slightly. Sing with a steady tone for the most accurate reading.
Microphone quality — built-in laptop microphones work fine. External microphones typically give cleaner results.
What Note Ranges Can Be Detected?
VocalCheck’s pitch detection covers:
- C1 (32 Hz) — well below typical bass vocal range
- C7 (2,093 Hz) — above soprano whistle register
In practice, all standard singing voice ranges fall comfortably within this detection window.
From Note Detection to Full Vocal Range Test
Detecting a single note in real time is the foundation of VocalCheck’s vocal range test. Once you know which notes you can hit, the tool records your lowest and highest notes to determine your complete vocal range and voice type.
Try singing from your lowest note to your highest, following VocalCheck’s reading as you go — you’ll discover exactly where your voice lives on the musical scale.