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DCT is a variable codec audio format designed for dictation by NCH Swift Sound. It has dictation header information and can be encrypted (often required by medical confidentiality laws). The standard dct player is the Express Scribe Transcription Player by NCH Swift Sound.

[edit] Codecs Supported

The list of codecs supported in dct files.

This is a reference to compare the audio quality and compression bitrates of the different wave compression codecs available for ".wav" and ".dct" files using the audio compression manager including PCM, GSM, ADPCM, CELP, SBC, TrueSpeech and MPEG Layer-3. Note: The Audio Compression Manager (ACM) is used for recording to .dct (dictation) files and/or .wav files.

Format Bitrate 1 Min = Sample
11,025Hz 16bit PCM 176.4kbs 1292k 11kbitpcm.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

[edit] Comments

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

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