The techniques of sparkling winemaking did not originate with the Benedictine monk Dom Pérignon, nor was the first purposely sparkling wine produced in the region of Champagne. Regardless, through centuries of refinement Champagne has become the world’s leading sparkling wine and the vinous embodiment of luxury and celebration.
In my WSET advanced manual Asti is described as a different method than the cuve close /charmat.
'This method is different from the other methods used in making sparking wine as it does not involve the production of a still dry wine.The must is stored at close to freezing point until it is needed. When it is required the must is warmed and the fermentation takes place in pressurized tanks.CO2 is allowed to escape until the alcohol reaches 6 per cent. At this point the CO2 is retained. The ferment continues until the alcohol has reached 7-7.5% about and the pressure is close to 5 atmospheres. '