Voiceprint University

Voiceprint has 6 different Views that can be accessed by clicking the dropdown box in the top left corner. The View options are:

1. Spectrogram
2. Power Spectrum
3. Pitch
4. Loudness
5. Brightness
6. Clarity

1. Spectrogram
The Spectrogram is a time-based display showing how the frequencies in your voice change moment by moment. It resolves the audio spectrum into individual harmonic components, plotted as:

• Horizontal axis (X): Time
  
• Vertical axis (Y-axis): Frequency
• Color or shading: Strength of each frequency at that moment (darker/brighter=stronger)

An amplitude-vs-time waveform strip appears at the top of the display.

Useful for observing:

• Pitch patterns – Fundamental frequency (F0) and harmonics appear as horizontal lines, making pitch and intonation easy to see.
• Formant movement – Resonance shifts (e.g. across vowels) appear as changes in shading

2. Power Spectrum
The Power Spectrum shows a single “snapshot” of frequency energy at a moment in time — unlike the Spectrogram, which shows change over time.

• Horizontal axis (X): Frequency, measured in Hertz (Hz), low to high pitch
• Vertical axis (Y): Intensity (dB SPL) of each frequency

Useful for analyzing:

• Formants – peaks corresponding to vocal tract resonances
• Harmonics – regularly spaced components from vocal fold vibration
• Voice quality – brighter/ringing tones show more high-frequency energy; darker/breathier tones show more low-frequency energy
  

Resonance Analysis Plotting
Overlays formant indicators (F1, F2, F3…) on the Spectrogram or Power Spectrum, so you can see how vocal tract resonances relate to pitch and harmonics in real time.

• On the Spectrogram, the overlay traces the center frequency of each formant over time
• On the Power Spectrum, the overlay marks the shape of each formant

These center frequencies are estimated from wideband spectrum analysis.

3. Pitch
The Pitch view displays your vocal pitch in real time using two linked displays: a Pitch Graph and a Piano Widget.

Pitch Graph
Tracks fundamental frequency (F0) over time.

• Horizontal axis (X): Time (seconds)
  
• Vertical axis (Y): Frequency, (Hz) – lower values=lower pitch

Useful for observing:

• Pitch Steadiness
• Glides and transitions (rising, falling, sliding)
• Vibrato or tremor

Piano Widget
Maps your pitch to the nearest musical note on a virtual keyboard in real time, linking frequency (Hz) to note names (e.g., C4, A4). Useful for matching pitch to specific target notes and understanding the relationship between frequency and musical pitch.

Settings: Frequency markers can be set to practice pitch and intonation exercises.

4. Loudness
The Loudness view tracks vocal intensity in real time using a Loudness Graph and a Loudness Meter.

Loudness Graph

• Horizontal axis (X): Time
• Vertical axis (Y): Loudness (dB SPL) – higher values=louder

Useful for observing:

• Dynamic range (soft vs. loud)
• Volume Consistency
• Control of intensity (crescendo, decrescendo, sudden changes)

Loudness
A speedometer-style widget showing instantaneous loudness, helping you:

• Train consistent loudness levels
• Practice dynamic control
• Avoid vocal strain by staying within a target range

5. Brightness
Brightness in Estill Voiceprint is defined as a change in resonance caused by narrowing the epilarynx (the vocal tract area above the vocal folds). This creates a “bright,” “twangy,” or “ringy” tone quality — sometimes perceived as nasal, though it can occur through the nose or mouth. Acoustically, it comes from increased energy in the 2.5–3.5 kHz range (the “singer’s formant”).

Brightness view measures the ratio of energy in the 2–4 kHz band (adjustable) against the 0–1 kHz band. This ratio corresponds to brightness and vocal carrying power. On the spectrogram, this range is marked with horizontal green lines.

Brightness Meter
A rising/falling column or “thermometer” shows brightness in real time, with a target marker line you can set. Helps you:

• See when you’re meeting your target brightness level
• Monitor consistency of “twang” quality
• Balance brightness with loudness for safe, efficient projection

Settings:

• Frequency range: Default 2000–4000 Hz
• Level target: Set a target ratio
• Sensitivity: Adjust 1–99 until the meter responds well to your voice

6. Clarity
Clarity measures how clear or noisy the voice sounds, based on the strength and regularity of its harmonics.

• A clear voice has strong, regular harmonics — clean lines on the spectrogram
• A less clear voice (pressed, breathy, or rough) has weaker harmonics and more scattered noise

This is calculated using Cepstral Peak Prominence (CPP): high CPP = clearer voice; low CPP = noisier voice.

Clarity Ball Widget
A blue ball that grows when your voice is clear and shrinks when it’s noisy or pressed — turning the underlying acoustic analysis into simple, real-time visual feedback.

Settings: Clarity Level Target can be set from 1–100%.

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