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Chest voice vs head voice in a vocal spectrum
Chest voice and head voice are training labels. A spectrum can help you compare tendencies, but it cannot certify the label by itself.
Compare the same note
Choose one pitch where both coordinations are possible. Keep the vowel and microphone distance fixed, then capture both attempts.
Look for sudden changes
The most useful information is often not the label but the sudden change: pitch confidence drops, harmonics disappear, or the formant candidates jump.
Include listening
The graph should support what you hear and feel. If a head voice attempt looks clean but feels strained, the graph is not the final judge.
Training note
Use the spectrum to ask better questions: what changed when it became easier, brighter, lighter, or more connected?
How to check this in the analyzer
Choose one note, one vowel, and one microphone distance. Capture the graph before and after one small change. Start by comparing pitch stability, then H1/H3/H5, then F1/F2/F3 candidates.
This is practice feedback, not medical diagnosis or a final technique label. The best result is a sound that is comfortable, repeatable, and useful for the music.