LDP stands for “Larynx Deep Positioning.” That is when the muscles of the throat stiffen, and the hyoid bone, the thyroid cartilage and the cricoid cartilage move towards the cervical spine a few millimeters.
The thyroid lies deep in the throat, the arytenoid cartilage moves toward the cervical vertebrae and finally, the arytenoid cartilage is forcibly rotated by pressuring the corniculate cartilage, and the back of vocal chord slightly opens.
Surprisingly, the voice is not significantly influenced by this because the arytenoid cartilage is located behind the vocal process.
Furthermore, if you go to see the ear, nose and throat doctor, known as an Otolaryngolist, it’s hard to visually see the symptoms through the laryngo fiber scope.This is not a disease, it is a condition.
If you do not have an ear for music, you probably would not immediately recognize a hoarse, mildly cracking voice.
This does not matter to Karaoke hobbyists or normal conversationalists but it is a problem for career singers.
If you care about this issue, I’d like you to check the position of your larynx.
This worry is going to be wiped away – if you can detect and fix this LDP problem.
The photo of model A:
The finger is pointing the part of the cartilago corniculata, it’s pressured by the front of cervical spine.
The photo of model B:
The finger is pointing to the back of the vocal chord, and this part is opened forcibly by the rolling arytenoid cartilage.
This figure suggests that the vocal chord is opened by pressing the hard material to the cartilago corniculata.