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I am currently using the Google Speech Recognition API in java to repeat what user input when spoken. The program works for words and numbers but fails when I use letters and postal code.

For example, I say M3X 5C9: it thinks I am saying "em 3 ex 5 see 9".

Is there a way to make it recognize only letters and digits?

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  • Currently there is not an option to instruct Speech API to read single letters or numbers. The purpose is to identify spoken words; nevertheless, in this question [Can the Google Speech API be configured to return only numbers / letters?](https://stackoverflow.com/questions/45310657/can-the-google-speech-api-be-configured-to-return-only-numbers-letters) there are some suggestions to use speechContexts, this can improve a bit the accuracy. – rsantiago Apr 08 '20 at 01:51

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