Oral, pharyngeal and laryngeal voice recording

Record mouth voice, pharyngeal voice and laryngeal voice.

Hardware — target ₹10,000–₹15,000

A. Air microphone

Use a small lavalier/condenser microphone.

Maono AU-410 USB Clip On Lavalier Microphone • ₹1,299

Approx. ₹1,300 in the current search results.

For the prototype, the important thing is repeatable placement, not an expensive studio microphone.

Placement:

10–15 cm from the mouth

slightly lateral rather than directly in front

fixed position using a small microphone stand/boom

B. Neck contact sensor

For the first prototype, I would actually start with a contact microphone, because it is simpler than designing an accelerometer circuit.

Korg CM-400 Contact Microphone • ₹1,400

Approximately ₹1,400 in the current results.

A piezo contact microphone can also be used very cheaply:

Gadget Hero's Piezo Contact Microphone • ₹473