1. A method for providing speech output for a speech-enabled application, the method comprising: receiving from the speech-enabled application a text input comprising a text transcription of a desired speech output; generating, using at least one computer system, an audio speech output corresponding to at least a portion of the text input, the audio speech output comprising at least one portion carrying contrastive stress to contrast with at least one other portion of the audio speech output; and providing the audio speech output for the speech-enabled application; wherein the generating comprises: identifying a plurality of tokens of the text input of a same text normalization type for which a contrastive stress pattern is to be applied; identifying at least one token of the plurality of tokens to be rendered with contrastive stress; and assigning contrastive stress to be carried by at least one portion of the audio speech output corresponding to at least one portion of the at least one token of the text input; wherein the assigning comprises: identifying at least one first portion of the at least one token of the plurality of tokens that differs from at least one corresponding first portion of at least one other token of the plurality of tokens, and at least one second portion of the at least one token that does not differ from at least one corresponding second portion of the at least one other token; and assigning contrastive stress to be carried by at least one first portion of the audio speech output corresponding to the identified at least one first portion of the at least one token, but not to at least one second portion of the audio speech output corresponding to the identified at least one second portion of the at least one token.
1. A method for providing speech output for a speech-enabled application, the method comprising: receiving from the speech-enabled application a text input comprising a text transcription of a desired speech output; generating, using at least one computer system, an audio speech output corresponding to at least a portion of the text input, the audio speech output comprising at least one portion carrying contrastive stress to contrast with at least one other portion of the audio speech output; and providing the audio speech output for the speech-enabled application; wherein the generating comprises: identifying a plurality of tokens of the text input of a same text normalization type for which a contrastive stress pattern is to be applied; identifying at least one token of the plurality of tokens to be rendered with contrastive stress; and assigning contrastive stress to be carried by at least one portion of the audio speech output corresponding to at least one portion of the at least one token of the text input; wherein the assigning comprises: identifying at least one first portion of the at least one token of the plurality of tokens that differs from at least one corresponding first portion of at least one other token of the plurality of tokens, and at least one second portion of the at least one token that does not differ from at least one corresponding second portion of the at least one other token; and assigning contrastive stress to be carried by at least one first portion of the audio speech output corresponding to the identified at least one first portion of the at least one token, but not to at least one second portion of the audio speech output corresponding to the identified at least one second portion of the at least one token. 3. The method of claim 1 , wherein the plurality of tokens are identified based at least in part on at least one indication in the text input that the contrastive stress pattern is desired in association with the plurality of tokens.