A developer asks for your help tuning a speech-to-text service that is used to transcribe text recorded on a mobile device. The quality of the transcription is not as good as expected. The app uses LINEAR16 encoding and a sampling rate of 12,000 Hz. What would you suggest to try to improve the quality?

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A developer asks for your help tuning a speech-to-text service that is used to transcribe text recorded on a mobile device. The quality of the transcription is not as good as expected. The app uses LINEAR16 encoding and a sampling rate of 12,000 Hz. What would you suggest to try to improve the quality?