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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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Supplier order call: 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

Supplier order call: 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

Supplier order call: recogniser transcript

What a speech recogniser returned for this take. It normalises: spoken "forty three dollars and eighteen cents" comes back as digits and a currency symbol. Compared with the reference script without normalising first, this disagrees on every number in the utterance and a word error rate computed that way reports a fault that does not exist. That gap is the point of the pair.

File: TXT · Speech Ladders
Use case: ASR testing· Paired fixture

Supplier order call: reference script

Exactly what was spoken, which is what the synthesiser was given: numbers, currency and times are spelled out as words because that is how they were said. This is ground truth by construction - it existed before the audio did - and it is deliberately NOT the same string as the recogniser transcript paired with it.

File: TXT · Speech Ladders
Use case: ASR testing· Paired fixture

Supplier order call: timed captions

The recogniser's output with timings, 6 cues over the full take. Carries the same normalisation as the plain transcript in this group, so it inherits the same scoring trap, and adds the timing dimension: a cue that starts before the word is spoken is a different defect from a cue with the wrong words in it.

File: SRT · Speech Ladders · 6 cues
Use case: ASR testingMedia accessibility· Conversion set

Tone with Click/Pop Transient

A clean 440 Hz tone interrupted by a short high-amplitude click at 0.4s, for click/pop removal tools.

File: WAV · Signals · 1 s
Use case: Audio analysisError handling

Trailing Silence 1s: 440 Hz Tone

A 440 Hz tone followed by exactly 1 second of digital silence. The tone should end at 2.0s: a direct fixture for testing trailing-silence trimming.

File: WAV · Silence Trim Set · 44100 Hz
Use case: Auto-trim testingAudio analysis

Trailing Silence 3s: 440 Hz Tone

A 440 Hz tone followed by exactly 3 seconds of digital silence. The tone should end at 2.0s: a direct fixture for testing trailing-silence trimming.

File: WAV · Silence Trim Set · 44100 Hz
Use case: Auto-trim testingAudio analysis

Trailing Silence 5s: 440 Hz Tone

A 440 Hz tone followed by exactly 5 seconds of digital silence. The tone should end at 2.0s: a direct fixture for testing trailing-silence trimming.

File: WAV · Silence Trim Set · 44100 Hz
Use case: Auto-trim testingAudio analysis

WAV: Codec-Set Source

The lossless PCM WAV source for the audio conversion set: the same 3-second tone every other codec in this group is encoded from. Use it as the reference when diffing encoders.

File: WAV · Codec Set · PCM
Use case: Conversion testingAudio analysis· Conversion set

White Noise

Three seconds of white noise with a flat power spectrum: a reference for testing noise handling, gating, and spectral tools.

File: WAV · Reference Tones · 3 s
Use case: Audio analysis

WMA: Windows Media Audio

The clip as Windows Media Audio (WMA v2) in an ASF container: Microsoft's lossy codec. For testing WMA decoding and conversion to open formats.

File: WMA · Codec Set · WMA v2
Use case: Conversion testingAudio analysis· Conversion set