1. Basic training
Voice training, no matter long or short, should be carried on every day.
2. Selection of training location
In the train, noisy place and spacious place such as sea coast or factory sites are preferable.
3. Contents of training
Singing songs, shouting time, reciting newspaper, books or poems are recommended.
4. Vocalization technique
When vocalizing, the air should be pushed concentratedly to the region A shown in the diagram, and should be released through the nose, which enables high and clear tone of voice.
Having those points in mind when training, your voice will be changed into higher tone in the course of time and the change will make a steady and unstrained speech.