ASD 1, formerly AS,
Has "no significant language delay" by old dsm-iv criteria.
Language is, indeed, atypical in prosody (inflections, rate, rhythm) ; pragmatics (the conversational, turn-taking aspects of verbal communication). Non-verbal communication is impaired, also. Pedantic ("little professor"), one-sided monologues about narrow, restricted areas of interest ; "hyperlexia" ( early reading) are common.