Dct (File Format)

Dct (File Format)


A proprietary variable codec audio file format designed for dictation by NCH Software. It has dictation header information and can be encrypted (often required by medical confidentiality laws). A free dct player, Express Scribe Transcription is provided.

List of codecs supported in dct files.

Format Bitrate 1 Min = Sample
11,025Hz 16bit PCM 176.4kbs 1292k 11k16bitpcm.wav
8000Hz 16bit PCM 128kbs 937.5k 8k16bitpcm.wav
11,025Hz 8bit PCM 88.2kbs 646k 11k8bitpcm.wav
11,025Hz u-Law 88.2kbs 646k 11kulaw.wav
8,000Hz 8bit PCM 64kbs 468.8k 8k8bitpcm.wav
8,000Hz u-Law 64kbs 468.8k 8kulaw.wav
11,025Hz 4bit ADPCM 44.1kbs 323k 11kadpcm.wav
8000Hz 4bit ADPCM 32kbs 234.4k 8kadpcm.wav
11,025Hz GSM6.10 18kbs 131.8k 11kgsm.wav
8000Hz Mp3 16k 16kbs 117k 8kmp316.wav
8,000Hz GSM6.10 13kbs 102.5k 8kgsm.wav
8000Hz Lernout & Hauspie SBC 12k 12.0kbs 87.9k 8ksbc12.wav
8,000Hz DSP Group Truespeech 9kbs 65.9k 8ktruespeech.wav
8000Hz Mp3 8k 8kbs 60k 8kmp38.wav
8,000Hz Lernout & Hauspie CELP 4.8kbs 35k 8kcelp.wav


The above are wave files - even if they have the mp3 codec they will have the ".wav" or ".dct" extension.

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