json
227 BDTMF Transcript: 1234 (JSON)
Ground-truth digit transcript for the DTMF sequence 1234.
- File
- JSON · Dtmf
- Use case
- ASR testing· Paired fixture
Explore the test library
Find files, editable templates and browser test targets by what you need to make or test. The directory below is cut by format; the two collections under it cut the same library by subject and by workflow.
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json
230 BDTMF Transcript: 13579 (JSON)
Ground-truth digit transcript for the DTMF sequence 13579.
- File
- JSON · Dtmf
- Use case
- ASR testing· Paired fixture
json
233 BDTMF Transcript: 567890 (JSON)
Ground-truth digit transcript for the DTMF sequence 567890.
- File
- JSON · Dtmf
- Use case
- ASR testing· Paired fixture
flac
94.2 KBFLAC with Metadata Stripped
The matching FLAC reduced to STREAMINFO and the exact same audio frames, so metadata-removal tests can compare compressed essence byte for byte.
- File
- FLAC · Tagged
- Use case
- Metadata testingConversion testing· Paired fixture
flac
94.6 KBFLAC with Vorbis Comments and Picture
A FLAC whose STREAMINFO and audio frames are accompanied by known Vorbis comments and a 32-pixel PNG front cover.
- File
- FLAC · Tagged
- Use case
- Metadata testingConversion testing· Paired fixture
flac
102.2 KBFLAC: Lossless
The clip as FLAC: free lossless audio compression. Byte-for-byte recoverable to the source PCM; for testing lossless decoders and conversion.
- File
- FLAC · Codec Set · FLAC
- Use case
- Conversion testingAudio analysis· Conversion set
wav
430.7 KBFrequency Sweep 20 Hz–20 kHz
A 5-second linear sweep from 20 Hz to 20 kHz across the full audible range, for testing frequency response, spectrograms, and playback fidelity.
- File
- WAV · Reference Tones · 5 s
- Use case
- Audio analysis
wav
39.2 KBHaccp training: chain telephone
A 5 second excerpt of this group's take, telephone chain. Band-limited, resampled and companded in one pass: the whole telephone path applied at once rather than one effect at a time. Delivered as pcm_mulaw at 8000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- WAV · Speech Ladders · pcm_mulaw
- Use case
- ASR testingAudio analysis+1· Conversion set
flac
146.1 KBHaccp training: clipped
A 5 second excerpt of this group's take, clipping. Samples driven past a fixed threshold and flattened, the damage a hot microphone does and the one no codec can undo. Delivered as flac at 24000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- FLAC · Speech Ladders · flac
- Use case
- ASR testingAudio analysis+1· Conversion set
wav
39.2 KBHaccp training: codec g722 16k
A 5 second excerpt of this group's take, codec. Encoded and decoded through a real speech codec, so the artefacts are the ones the format actually produces rather than a simulation of them. Delivered as adpcm_g722 at 16000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- WAV · Speech Ladders · adpcm_g722
- Use case
- ASR testingAudio analysis+1· Conversion set
gsm
8.1 KBHaccp training: codec gsm 8k
A 5 second excerpt of this group's take, codec. Encoded and decoded through a real speech codec, so the artefacts are the ones the format actually produces rather than a simulation of them. Delivered as gsm at 8000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- GSM · Speech Ladders · gsm
- Use case
- ASR testingAudio analysis+1· Conversion set
mp3
79.5 KBHaccp training: codec mp3 128
A 5 second excerpt of this group's take, codec. Encoded and decoded through a real speech codec, so the artefacts are the ones the format actually produces rather than a simulation of them. Delivered as mp3 at 24000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- MP3 · Speech Ladders · mp3
- Use case
- ASR testingAudio analysis+1· Conversion set
mp3
20 KBHaccp training: codec mp3 32
A 5 second excerpt of this group's take, codec. Encoded and decoded through a real speech codec, so the artefacts are the ones the format actually produces rather than a simulation of them. Delivered as mp3 at 24000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- MP3 · Speech Ladders · mp3
- Use case
- ASR testingAudio analysis+1· Conversion set
wav
39.2 KBHaccp training: codec mulaw 8k
A 5 second excerpt of this group's take, codec. Encoded and decoded through a real speech codec, so the artefacts are the ones the format actually produces rather than a simulation of them. Delivered as pcm_mulaw at 8000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- WAV · Speech Ladders · pcm_mulaw
- Use case
- ASR testingAudio analysis+1· Conversion set
opus
15.4 KBHaccp training: codec opus 24
A 5 second excerpt of this group's take, codec. Encoded and decoded through a real speech codec, so the artefacts are the ones the format actually produces rather than a simulation of them. Delivered as opus at 48000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- OPUS · Speech Ladders · opus
- Use case
- ASR testingAudio analysis+1· Conversion set
flac
136.8 KBHaccp training: dropouts
A 5 second excerpt of this group's take, dropouts. Short spans silenced outright, as a packet-switched call drops them, so a transcriber must decide between a pause and a missing word. Delivered as flac at 24000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- FLAC · Speech Ladders · flac
- Use case
- ASR testingAudio analysis+1· Conversion set
flac
506.2 KBHaccp training: full spoken take
The complete 19.2 second utterance at 24000 Hz mono FLAC, spoken by the bm_george voice at 0.9x rate. The five-second excerpt in this group's ladder is cut from this take, so anything needing real duration uses this file and anything comparing damage uses the ladder. Lossless, so it is the archival reference for the whole group.
- File
- FLAC · Speech Ladders · flac
- Use case
- ASR testingAudio analysis· Conversion set
flac
329.6 KBHaccp training: noise snr0
A 5 second excerpt of this group's take, noise. Broadband noise mixed in at a measured signal-to-noise ratio, which is where a denoiser is either working or not. Delivered as flac at 24000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- FLAC · Speech Ladders · flac
- Use case
- ASR testingAudio analysis+1· Conversion set
flac
309.4 KBHaccp training: noise snr10
A 5 second excerpt of this group's take, noise. Broadband noise mixed in at a measured signal-to-noise ratio, which is where a denoiser is either working or not. Delivered as flac at 24000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- FLAC · Speech Ladders · flac
- Use case
- ASR testingAudio analysis+1· Conversion set
flac
292.8 KBHaccp training: noise snr20
A 5 second excerpt of this group's take, noise. Broadband noise mixed in at a measured signal-to-noise ratio, which is where a denoiser is either working or not. Delivered as flac at 24000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- FLAC · Speech Ladders · flac
- Use case
- ASR testingAudio analysis+1· Conversion set
flac
146 KBHaccp training: plate
A 5 second excerpt of this group's take, reference. The clean five-second excerpt every other file in this ladder is scored against. Delivered as flac at 24000 Hz mono. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- FLAC · Speech Ladders · flac
- Use case
- ASR testingAudio analysis+1· Conversion set
flac
192.2 KBHaccp training: rate 16000
A 5 second excerpt of this group's take, resample. The same audio at a different sample rate, which is the step most speech pipelines get wrong silently by assuming their model's rate. Delivered as flac at 16000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- FLAC · Speech Ladders · flac
- Use case
- ASR testingAudio analysis+1· Conversion set
flac
359.5 KBHaccp training: rate 44100
A 5 second excerpt of this group's take, resample. The same audio at a different sample rate, which is the step most speech pipelines get wrong silently by assuming their model's rate. Delivered as flac at 44100 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- FLAC · Speech Ladders · flac
- Use case
- ASR testingAudio analysis+1· Conversion set
flac
99.5 KBHaccp training: rate 8000
A 5 second excerpt of this group's take, resample. The same audio at a different sample rate, which is the step most speech pipelines get wrong silently by assuming their model's rate. Delivered as flac at 8000 Hz mono. Scored against plate.flac in the same group, which is the same five seconds undamaged. The parameters in the specification are what the file MEASURED, not what was requested of it.
- File
- FLAC · Speech Ladders · flac
- Use case
- ASR testingAudio analysis+1· Conversion set