Thanks for great sharing your information and I have got (from net) few more information’s relates to this topic as follows,
Rajwade acknowledges the Aryans have come from outside India and the original indigenous residents were the Naagas. They were expert in drawing pictures, they later married Vedic Aryans and it is customary to include Naaga vamsha into the Aryan fold. He also acknowledges the presence of non-Aryan languages like Asur bhasha, Dravida bhasha, Chinese and Red Indian and African languages. [Rajwade V. K., bharatiya vivah sansthe chaitihas, arathi, p. 100]
Paishachi language was Tamil is the experts’ view. Having made it clear that Paishachi language was a very rich language, and very widely spoken, let us see the experts’ views on what was this language. Before Aryans could influence things here, the language of India was “Paishachi”, which meant Tamil, and it was spoken from Kashmir to Kanyakumari. Nair observes:
“According to Mr. Oldham there are ample evidences to show that the so-call “Paisachi” language was spoken throughout India. He says “It is evident that the old Sanskrit Grammarians considered the language of the Dravidian countries to be connected with the vernaculars of Northern India; and that in their opinion it was especially related to the speech of those who as we have seen, were apparently descended from the Asura tribes. Thus in the Shahasha Chandrika Lakshmidhara says that the Paisachi language is spoken in the Paisachi countries of Pandya, Kekaya Vahlika, Sahya, Nepala, Kuntala, Sudarsha, Bota, Gandhara, Haiva and Kangana and there are Paisachi countries. Of all the vernaculars the Paisachi is said to have contained the smallest infusion of Sanskrit”. [Nair B. N., “The Dynamic Brahmin”, p.70]
Dr. K. M. Panikar has something equally interesting to say; “The distribution of the indigenous races even today in the uplands of South Bihar and in the eastern areas of Madhya Pradesh and the persistence of the Bhils in the Aravalli and Vindhya ranges show that as a population momentum the Aryan invasion ceased to have any momentum after it reached the Gangetic valley. The gradual spread of Hinduism all over India and with it the Aryan speech should not blind us to the fact that even in North India outside the Punjab the Aryans contributed only a racial strain. In Gujrat and in Maharashtra the neo-Aryans were able to improve their language but in the Deccan and in the South the Dravidian speech not only held its own but was able to drive out the Austric and other linguistic elements. The spread of Aryanism and Sanskrit, originally associated with Agastiyas’ crossing of the Vindhyas became, an accomplished fact only in the first centuries of the Christian era as may be seen from the earlier Paisachi tradition of the Satavahana Emperors of Pratishtan” [K. M. Panikker, Geographical Factors in Indian History, 1955, quoted by Nair B. N., “The Dynamic 0Brahmin”, p.70]
If you could reply to this we will get some more clarity in our discussion.