Audio

Audio test files usually arrive as someone's music clip. These are engineered. Silence sets document leading and trailing trim points; ASR suites pair synthetic digit utterances with transcripts and noise twins; loudness ladders, peak-clip pairs, stereo/mono, sample-rate conversion, and DTMF sequences exercise meters and harnesses. Every file is short to stay within budget and ships with documented sample rate, bit depth, and duration.

Filter audio on Browse · 396 files · 18 subcategories

Results start with a representative from each related test family. Use a card’s variant menu or the filters below to reach a specific format, profile, or failure case; every sample retains its own detail page and download.

Frequently asked questions

Are the ASR clips real speech recordings?

No, Wave B ASR fixtures are synthetic tone-digit utterances with JSON transcripts. They exercise ASR harnesses and loaders without shipping copyrighted speech.

What are the silence trim fixtures for?

Documented leading/trailing silence (1–5 s) on pure tones so auto-trim tools can be checked against exact timestamps. Wave E also adds mid-gap silence cases for split/trim tools.

Which formats are included?

WAV references plus compressed codecs (MP3, FLAC, OGG, and more). Specs list sample rate, bit depth, and duration.

How do I test loudness meters or peak clip detection?

Filter Browse by purpose loudness-testing for the amplitude ladder and clean↔hard-clipped peak pairs. Stereo/mono and sample-rate twins cover channel and resampler QA.

Start with one example from each use-case group, then continue through its other test families. Choose a use case, search, or filter to find a specific profile; a card’s variant menu contains its related samples.

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Results

83 test families · 396 available files · Page 1 of 5

Asr

ASR Cue: “one” Clean (WAV)

Short synthetic cue tone for “one”: clean reference for wake-word / digit ASR smoke tests.

File: WAV · Asr · 16000
Use case: ASR testing / Audio analysis

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Bit Depth Ladder

440 Hz Tone @ 16-bit (WAV)

A 440 Hz sine tone stored as 16-bit PCM: part of a bit-depth ladder (8/16/24-bit) of the identical tone, for testing bit-depth conversion, dithering, and quantisation-noise handling.

File: WAV · Bit Depth Ladder · 2 s
Use case: Audio analysis / Conversion testing

Choose a variant (3)

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Channels

5.1 Surround Channel Identification (WAV, 6ch)

A six-channel 5.1 surround WAV that plays a 1-second tone in each channel in turn, in the standard WAV order (FL, FR, C, LFE, SL, SR). A fixture for testing multichannel decoding, downmixing, and channel-order handling.

File: WAV · Channels · 44100 Hz
Use case: Audio analysis

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Codec Set

AAC: ADTS

The clip as raw AAC in an ADTS stream: the codec behind most streaming and mobile audio. For testing AAC decoders and remux into MP4.

File: AAC · Codec Set · AAC-LC
Use case: Conversion testing / Audio analysis

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Container Formats

AIFF: 1 kHz Sine Tone

A pure 1 kHz sine tone stored as AIFF: Apple's big-endian 16-bit PCM container, 3 seconds, 44.1 kHz mono. A clean reference for testing AIFF decoders and WAV↔AIFF conversion.

File: AIFF · Container Formats · 3 s
Use case: Audio analysis / Conversion testing

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Dtmf

DTMF Dialing Tones (WAV)

A DTMF (touch-tone) dialing sequence dialing a reserved 555-01xx number: each digit is the standard dual-tone pair. A fixture for testing DTMF decoders, Goertzel detectors, and tone analysis.

File: WAV · Dtmf · 44100 Hz
Use case: Audio analysis

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Loudness Ladder

Loudness Ladder: Loud (440 Hz)

1 s 440 Hz tone at linear amplitude 0.55 (~-5.2 dBFS peak): rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFS / Audio analysis

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P8 Convert

Convert v2 DTS Coherent Acoustics Reference Tone

Real DTS Coherent Acoustics audio payload encoded from the same deterministic 0.7-second mono reference tone for legacy import coverage. Stable P8 artifact p8-convert-legacy-dts.

File: DTS · P8 Convert
Use case: Conversion testing / Audio analysis

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Peak Clip

Peak-Clip Pair 01: Clean (220 Hz)

Clean 220 Hz tone (amp 0.45): reference twin for the hard-clipped pair.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFS / Audio analysis

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Reference Tones

1 kHz Sine Tone

A pure 1000 Hz sine tone, 3 seconds, 16-bit 44.1 kHz mono: a clean reference signal for level metering, spectrum analysis, and waveform rendering.

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

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Sample Rate Ladder

1 kHz Tone @ 16000 Hz Sample Rate (WAV)

A 1 kHz sine tone sampled at 16000 Hz: part of a sample-rate ladder (8/16/44.1/48/96 kHz) of the identical tone, for testing resampling, sample-rate detection, and aliasing.

File: WAV · Sample Rate Ladder · 2 s
Use case: Audio analysis / Conversion testing

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Sample Rate Set

Sample-Rate Set: 440 Hz @ 16000 Hz

Same 440 Hz tone rendered at 16000 Hz sample rate: twin in the 8k/16k/44.1k set.

File: WAV · Sample Rate Set · 0.6 s
Use case: Audio analysis / Conversion testing

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Signals

Clipped Tone: intentionally clipped (WAV)

A 440 Hz tone driven past full scale and hard-clipped so its peaks are flat-topped: an intentionally clipped signal for testing clip and true-peak detection, distortion metering, and de-clipping tools.

File: WAV · Signals · 2 s
Use case: Audio analysis / Error handling

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Silence Middle

Silence-in-Middle: Asym Lead

440 Hz tone with 0.5s of digital silence in the middle (0.2s + silence + 0.8s). Fixture for mid-gap trim / split tools.

File: WAV · Silence Middle · 16000
Use case: Auto-trim testing / Audio analysis

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Silence Trim Set

Leading Silence 1s: 440 Hz Tone

A 440 Hz tone preceded by exactly 1 second of digital silence. A direct fixture for auto-trim tools: the tone should start at 1.000s.

File: WAV · Silence Trim Set · 44100 Hz
Use case: Auto-trim testing / Audio analysis

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Speech Ladders · Synthetic realistic media

Complaint 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 audi

File: TXT · Speech Ladders
Use case: ASR testing

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Synthetic speech. Generated locally with a text-to-speech model from an authored script; not a recording of a real person, and no real customer, order or incident is described.

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