Vocal Spectrum — Vocal Frequency Analyzer

How to Use Vocal Spectrum (for Vocal Practice)

Use it while singing to monitor frequency-energy distribution in real time, then replay and compare sections to verify what changed and what stayed consistent.

Live Feedback You Can Act On

• Higher bars mean stronger energy in that frequency band, so you can quickly see where your tone is focused.
• Peak-hold lines keep short transients visible, helping you catch quick consonant attacks and sharp bursts.
• Log-frequency spacing keeps important low and mid vocal areas readable instead of visually compressed.

How to Read This Graph

• X-axis (Hz, log): 80 Hz to 16 kHz. Guide lines at 125/250/500/1k/2k/4k/8k Hz help you anchor where energy clusters.
• Y-axis (dBFS): 0 at the top; the bottom follows Sensitivity (about -30 dB at 0% to about -75 dB at 100%). Closer to 0 means stronger energy in that band for that frame.
• Bars are FFT-bin aggregates: they show band energy, not note names and not a direct pitch detector output.

Panel Controls (Low/High, Graph, Sensitivity, Stats)

• Low-High sets the visible analysis band (about 20 Hz to 22 kHz). Narrow the band to focus on one problem area, such as low resonance or upper sibilance.
• Graph mode gives three views of the same data: Bar for fast band-by-band reading, Line for smooth contour tracking, and Circle for radial pattern comparison across takes.
• Sensitivity (0–100%, same scale as Vocal Pitch Monitor) controls the display floor in dB. Higher values reveal weaker partials and breath components; lower values clean up low-level noise so major energy trends are easier to see.
• The stats chips summarize the current frame inside the selected band: PEAK (dominant frequency), LEVEL (peak dB), CENTROID (energy-weighted brightness center), and RMS (overall loudness).
• Panel choices are saved in browser local storage, so your preferred range, graph type, and sensitivity are restored when you reopen the tool.

What Changes When You Adjust the Panel

• Changing Low-High can shift PEAK and CENTROID immediately because bins outside the selected band are excluded from stats and drawing.
• Sensitivity mainly affects weak content visibility and readout inclusion threshold, which is useful when comparing quiet breathy takes versus stronger projected takes.
• Peak-hold behavior stays consistent across Bar, Line, and Circle views: peaks stay visible briefly, then decay gradually so transients remain readable.

Playback Insights Across the Full Take

• Recorded spectrum history is synced to playback, so you can inspect any point in the take (up to 10 minutes).
• This is ideal for A/B checks: before vs. after technique changes, mic position changes, or warm-up effects.

Useful Vocal Signals to Watch

• Harmonic structure: check whether overtone peaks remain stable as you sustain notes.
• Register transitions: identify where chest-to-head shifts cause abrupt spectrum changes.
• Sibilance control: monitor high-frequency peaks during 'S', 'Z', and 'CH' sounds.
• Breath noise: if 10 kHz+ stays elevated, adjust mic angle, distance, or pop filter.

Reference: Typical Fundamental (F0) Ranges by Voice Type

• Bass: E2-E4 (about 82-330 Hz), Baritone: G2-G4 (about 98-392 Hz), Tenor: C3-C5 (about 131-523 Hz).
• Alto/Contralto: F3-F5 (about 175-698 Hz), Mezzo-soprano: A3-A5 (about 220-880 Hz), Soprano: C4-C6 (about 262-1047 Hz).
• Use this as a practical orientation only. Pop/musical/CCM usage can differ, and individuals often overlap multiple categories.
• When you sing a sustained pitch, the lowest clear strong peak is often near the fundamental. If it is far from your intended note area, re-check pitch target and support.

Quick Practice Workflow

• Sing one phrase at medium volume, then louder, and compare whether harmonics rise smoothly or become overly spiky.
• Repeat a difficult transition note and watch where the spectrum shape jumps; re-test after vowel or resonance adjustments.
• Record two takes with different mic distance, then scrub playback to compare sibilance and breath-noise peaks section by section.

Tools That Pair Well

• Use Vocal Pitch Monitor for pitch accuracy and Vocal Spectrum for tone-shaping and energy balance.
• Use Singing Recorder to capture takes, then review section by section to build repeatable vocal control.