The IIIT-H Indic speech databases were developed at Speech and Vision Lab, IIIT-H for the purpose of building speech synthesis systems in Indian languages.
The speech data was recorded by a native speaker of the language. The recording was done in a studio environment using a standard headset microphone connected to a Zoom handy recorder. We used a handy recorder as it was highly mobile and easy to operate. By using a headset the distance from the microphone to a mouth and recording level was kept constant.
Kishore Prahallad, E. Naresh Kumar, Venkatesh Keri, S. Rajendran and Alan W Black "The IIIT-H Indic Speech Databases", in Proceedings of Interspeech 2012, Portland, Oregon, USA. PDF