Reference audio for analysis

220 Hz Sine Tone

A pure 220 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

440 Hz Sine Tone (A4)

A pure 440 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

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

Frequency 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

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

Pink Noise

Three seconds of pink noise with a 1/f power spectrum — the standard reference for loudness and room-calibration testing.

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

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 testingAudio analysis

Leading Silence 3s — 440 Hz Tone

A 440 Hz tone preceded by exactly 3 seconds of digital silence. A direct fixture for auto-trim tools — the tone should start at 3.000s.

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

Leading Silence 5s — 440 Hz Tone

A 440 Hz tone preceded by exactly 5 seconds of digital silence. A direct fixture for auto-trim tools — the tone should start at 5.000s.

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

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

AIFF — 440 Hz Sine Tone

A pure 440 Hz 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 analysisConversion testing

AU — 440 Hz Sine Tone

A pure 440 Hz sine tone stored as a Sun/NeXT AU file — big-endian 16-bit PCM, 3 seconds, 44.1 kHz mono. A compact reference for AU decoding and format conversion.

File: AU · Container Formats · 3 s
Use case: Audio analysisConversion testing

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 analysisConversion testing

AU — 1 kHz Sine Tone

A pure 1 kHz sine tone stored as a Sun/NeXT AU file — big-endian 16-bit PCM, 3 seconds, 44.1 kHz mono. A compact reference for AU decoding and format conversion.

File: AU · Container Formats · 3 s
Use case: Audio analysisConversion testing

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

MP3 — CBR 192 kbps

The source clip as constant-bitrate MP3 (LAME, 192 kbps) — the most universally supported lossy audio format. For testing MP3 decoders, players, and conversion.

File: MP3 · Codec Set · MP3 (LAME)
Use case: Conversion testingAudio analysis· Conversion set

MP3 — VBR (V2)

The same clip as variable-bitrate MP3 (LAME V2) — for testing VBR handling, seeking, and duration estimation against the CBR twin.

File: MP3 · Codec Set · MP3 (LAME)
Use case: Conversion testingAudio analysis· Conversion set

FLAC — 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

OGG — Vorbis

The clip as Ogg Vorbis — a royalty-free lossy codec. Browser-playable; for testing Vorbis decoding and Ogg conversion.

File: OGG · Codec Set · Vorbis
Use case: Conversion testingAudio analysis· Conversion set

Opus

The clip as Opus — the modern low-latency codec used by WebRTC and streaming. Browser-playable; for testing Opus decoding and conversion.

File: OPUS · Codec Set · Opus
Use case: Conversion testingAudio analysis· Conversion 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 testingAudio analysis· Conversion set

M4A — AAC (MP4)

The clip as AAC in an MP4/M4A container (faststart) — Apple's default audio container. For testing M4A parsing and MP4 audio conversion.

File: M4A · Codec Set · AAC-LC
Use case: Conversion testingAudio analysis· Conversion set

ALAC — Apple Lossless

The clip as Apple Lossless (ALAC) in an M4A container — lossless, unlike the AAC M4A twin. For testing ALAC decoding and lossless conversion.

File: M4A · Codec Set · ALAC
Use case: Conversion testingAudio analysis· Conversion set

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

AC-3 — Dolby Digital

The clip as AC-3 (Dolby Digital) — the multichannel codec used in DVD/broadcast. Rendered here in stereo; for testing AC-3 decoding and conversion.

File: AC3 · Codec Set · AC-3 (Dolby Digital)
Use case: Conversion testingAudio analysis· Conversion set

M4R — iPhone Ringtone

The clip as an M4R iPhone ringtone — AAC in an MP4 container with the ringtone extension. For testing that a converter maps M4R↔M4A correctly.

File: M4R · Codec Set · AAC-LC
Use case: Conversion testingAudio analysis· Conversion set

AMR — Narrowband Speech

The clip resampled to 8 kHz mono and encoded as AMR narrowband — the telephony/voice-note codec. For testing AMR decoding and speech-codec conversion.

File: AMR · Codec Set · AMR-NB
Use case: Conversion testingAudio analysis· Conversion set

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

Stereo Channel Map — L 440 Hz / R 880 Hz (WAV)

A stereo WAV with a distinct tone in each channel — 440 Hz on the left, 880 Hz on the right — so you can verify channel mapping, panning, and L/R routing unambiguously.

File: WAV · Channels · 3 s
Use case: Audio analysis

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

1 kHz Tone @ 8000 Hz Sample Rate (WAV)

A 1 kHz sine tone sampled at 8000 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 analysisConversion testing· Conversion set

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 analysisConversion testing· Conversion set

1 kHz Tone @ 44100 Hz Sample Rate (WAV)

A 1 kHz sine tone sampled at 44100 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 analysisConversion testing· Conversion set

1 kHz Tone @ 48000 Hz Sample Rate (WAV)

A 1 kHz sine tone sampled at 48000 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 analysisConversion testing· Conversion set

1 kHz Tone @ 96000 Hz Sample Rate (WAV)

A 1 kHz sine tone sampled at 96000 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 analysisConversion testing· Conversion set

440 Hz Tone @ 8-bit (WAV)

A 440 Hz sine tone stored as 8-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 analysisConversion testing· Conversion set

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 analysisConversion testing· Conversion set

440 Hz Tone @ 24-bit (WAV)

A 440 Hz sine tone stored as 24-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 analysisConversion testing· Conversion set

Digital Silence (2s WAV)

Two seconds of true digital silence (all-zero samples) — a fixture for testing silence detection, auto-trim thresholds, and noise-floor handling.

File: WAV · Signals · 2 s
Use case: Audio analysisAuto-trim testing

Notification Chime (WAV)

A short four-note notification chime (a C-major arpeggio with a decaying final note) — a pleasant, recognisable UI sound for testing playback, short-clip handling, and notification pipelines.

File: WAV · Signals · 1 s
Use case: Audio analysis

Melody — C Major Scale (WAV)

A two-second melody playing an ascending C-major scale (C4 to C5) with per-note envelopes — a simple musical signal for testing pitch detection, onset detection, and playback.

File: WAV · Signals · 2 s
Use case: Audio analysis

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 analysisError handling

ID3-tagged MP3 (title / artist / album)

An MP3 with a full set of ID3v2.3 tags (title, artist, album, date, genre, comment) over a synthetic C-major melody. A fixture for testing tag readers, metadata editors, and music-library importers.

File: MP3 · Tagged · MP3 (LAME)
Use case: Audio analysisConversion testing

Stereo Channel Imbalance (440 Hz)

A 440 Hz stereo tone with a loud left channel and a near-silent right channel — for balance and mono-mix testing.

File: WAV · Signals · 1 s
Use case: Audio analysis

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

Quiet Audio Needing Normalization

A very quiet modulated tone (~peak 0.04) for testing loudness normalization and gain staging.

File: WAV · Signals · 1.5 s
Use case: Audio analysis

ASR — 0123 Clean (WAV)

Synthetic clean tone sequence encoding digits 0123 (zero one two three). Pair with the noisy twin and transcript JSON for ASR evaluation.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR — 0123 Noisy (WAV)

Noisy twin of the digit sequence 0123 at ~7 dB SNR. Score ASR against the shared transcript JSON.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR — 4567 Clean (WAV)

Synthetic clean tone sequence encoding digits 4567 (four five six seven). Pair with the noisy twin and transcript JSON for ASR evaluation.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR — 4567 Noisy (WAV)

Noisy twin of the digit sequence 4567 at ~7 dB SNR. Score ASR against the shared transcript JSON.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR — 89 Clean (WAV)

Synthetic clean tone sequence encoding digits 89 (eight nine). Pair with the noisy twin and transcript JSON for ASR evaluation.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR — 89 Noisy (WAV)

Noisy twin of the digit sequence 89 at ~7 dB SNR. Score ASR against the shared transcript JSON.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR — 1357 Clean (WAV)

Synthetic clean tone sequence encoding digits 1357 (one three five seven). Pair with the noisy twin and transcript JSON for ASR evaluation.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR — 1357 Noisy (WAV)

Noisy twin of the digit sequence 1357 at ~7 dB SNR. Score ASR against the shared transcript JSON.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR — 24680 Clean (WAV)

Synthetic clean tone sequence encoding digits 24680 (two four six eight zero). Pair with the noisy twin and transcript JSON for ASR evaluation.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR — 24680 Noisy (WAV)

Noisy twin of the digit sequence 24680 at ~7 dB SNR. Score ASR against the shared transcript JSON.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR — 987654 Clean (WAV)

Synthetic clean tone sequence encoding digits 987654 (nine eight seven six five four). Pair with the noisy twin and transcript JSON for ASR evaluation.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR — 987654 Noisy (WAV)

Noisy twin of the digit sequence 987654 at ~7 dB SNR. Score ASR against the shared transcript JSON.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

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 testingAudio analysis· Paired fixture

ASR Cue — “one” Noisy (WAV)

Noisy twin of the “one” cue tone (~5 dB SNR).

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Cue — “zero” Clean (WAV)

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

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Cue — “zero” Noisy (WAV)

Noisy twin of the “zero” cue tone (~5 dB SNR).

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 1111 Clean (WAV)

Extra synthetic digit utterance 1111 (one one one one) — clean twin.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 1111 Noisy (WAV)

Noisy twin of digit sequence 1111.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 2222 Clean (WAV)

Extra synthetic digit utterance 2222 (two two two two) — clean twin.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 2222 Noisy (WAV)

Noisy twin of digit sequence 2222.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 3333 Clean (WAV)

Extra synthetic digit utterance 3333 (three three three three) — clean twin.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 3333 Noisy (WAV)

Noisy twin of digit sequence 3333.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 4444 Clean (WAV)

Extra synthetic digit utterance 4444 (four four four four) — clean twin.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 4444 Noisy (WAV)

Noisy twin of digit sequence 4444.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 5555 Clean (WAV)

Extra synthetic digit utterance 5555 (five five five five) — clean twin.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 5555 Noisy (WAV)

Noisy twin of digit sequence 5555.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 6666 Clean (WAV)

Extra synthetic digit utterance 6666 (six six six six) — clean twin.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 6666 Noisy (WAV)

Noisy twin of digit sequence 6666.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 7777 Clean (WAV)

Extra synthetic digit utterance 7777 (seven seven seven seven) — clean twin.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 7777 Noisy (WAV)

Noisy twin of digit sequence 7777.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 8888 Clean (WAV)

Extra synthetic digit utterance 8888 (eight eight eight eight) — clean twin.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 8888 Noisy (WAV)

Noisy twin of digit sequence 8888.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 9999 Clean (WAV)

Extra synthetic digit utterance 9999 (nine nine nine nine) — clean twin.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 9999 Noisy (WAV)

Noisy twin of digit sequence 9999.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 0000 Clean (WAV)

Extra synthetic digit utterance 0000 (zero zero zero zero) — clean twin.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

ASR Extra — 0000 Noisy (WAV)

Noisy twin of digit sequence 0000.

File: WAV · Asr · 16000
Use case: ASR testingAudio analysis· Paired fixture

Loudness Ladder — Silent (440 Hz)

1 s 440 Hz tone at linear amplitude 0.0 (digital silence) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

Loudness Ladder — Very Quiet (440 Hz)

1 s 440 Hz tone at linear amplitude 0.02 (~-34.0 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

Loudness Ladder — Quiet (440 Hz)

1 s 440 Hz tone at linear amplitude 0.05 (~-26.0 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

Loudness Ladder — Moderate (440 Hz)

1 s 440 Hz tone at linear amplitude 0.15 (~-16.5 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

Loudness Ladder — Nominal (440 Hz)

1 s 440 Hz tone at linear amplitude 0.35 (~-9.1 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

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 / LUFSAudio analysis· Conversion set

Loudness Ladder — Very Loud (440 Hz)

1 s 440 Hz tone at linear amplitude 0.75 (~-2.5 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

Loudness Ladder — Near Fs (440 Hz)

1 s 440 Hz tone at linear amplitude 0.95 (~-0.45 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

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 / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 01 — Clipped (220 Hz)

Hard-clipped twin of the 220 Hz tone (×3.2 then clip to ±1) for peak/limiter tests.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 02 — Clean (440 Hz)

Clean 440 Hz tone (amp 0.45) — reference twin for the hard-clipped pair.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 02 — Clipped (440 Hz)

Hard-clipped twin of the 440 Hz tone (×3.2 then clip to ±1) for peak/limiter tests.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 03 — Clean (880 Hz)

Clean 880 Hz tone (amp 0.45) — reference twin for the hard-clipped pair.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 03 — Clipped (880 Hz)

Hard-clipped twin of the 880 Hz tone (×3.2 then clip to ±1) for peak/limiter tests.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 04 — Clean (660 Hz)

Clean 660 Hz tone (amp 0.45) — reference twin for the hard-clipped pair.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 04 — Clipped (660 Hz)

Hard-clipped twin of the 660 Hz tone (×3.2 then clip to ±1) for peak/limiter tests.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 05 — Clean (330 Hz)

Clean 330 Hz tone (amp 0.45) — reference twin for the hard-clipped pair.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 05 — Clipped (330 Hz)

Hard-clipped twin of the 330 Hz tone (×3.2 then clip to ±1) for peak/limiter tests.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 06 — Clean (550 Hz)

Clean 550 Hz tone (amp 0.45) — reference twin for the hard-clipped pair.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 06 — Clipped (550 Hz)

Hard-clipped twin of the 550 Hz tone (×3.2 then clip to ±1) for peak/limiter tests.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Stereo/Mono Twin 01 — Mono (440 Hz)

Mono 440 Hz twin — pair with the stereo file for channel-count / downmix tests.

File: WAV · Stereo Mono · 16000
Use case: Audio analysisConversion testing· Paired fixture

Stereo/Mono Twin 01 — Stereo (440 Hz)

Stereo twin of the 440 Hz tone (L=mono, R=phase-shifted) for stereo↔mono conversion tests.

File: WAV · Stereo Mono · 16000
Use case: Audio analysisConversion testing· Paired fixture

Stereo/Mono Twin 02 — Mono (523 Hz)

Mono 523 Hz twin — pair with the stereo file for channel-count / downmix tests.

File: WAV · Stereo Mono · 16000
Use case: Audio analysisConversion testing· Paired fixture

Stereo/Mono Twin 02 — Stereo (523 Hz)

Stereo twin of the 523 Hz tone (L=mono, R=phase-shifted) for stereo↔mono conversion tests.

File: WAV · Stereo Mono · 16000
Use case: Audio analysisConversion testing· Paired fixture

Stereo/Mono Twin 03 — Mono (659 Hz)

Mono 659 Hz twin — pair with the stereo file for channel-count / downmix tests.

File: WAV · Stereo Mono · 16000
Use case: Audio analysisConversion testing· Paired fixture

Stereo/Mono Twin 03 — Stereo (659 Hz)

Stereo twin of the 659 Hz tone (L=mono, R=phase-shifted) for stereo↔mono conversion tests.

File: WAV · Stereo Mono · 16000
Use case: Audio analysisConversion testing· Paired fixture

Stereo/Mono Twin 04 — Mono (784 Hz)

Mono 784 Hz twin — pair with the stereo file for channel-count / downmix tests.

File: WAV · Stereo Mono · 16000
Use case: Audio analysisConversion testing· Paired fixture

Stereo/Mono Twin 04 — Stereo (784 Hz)

Stereo twin of the 784 Hz tone (L=mono, R=phase-shifted) for stereo↔mono conversion tests.

File: WAV · Stereo Mono · 16000
Use case: Audio analysisConversion testing· Paired fixture

Sample-Rate Set — 440 Hz @ 8000 Hz

Same 440 Hz tone rendered at 8000 Hz sample rate — twin in the 8k/16k/44.1k set.

File: WAV · Sample Rate Set · 0.6 s
Use case: Audio analysisConversion testing· Conversion 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 analysisConversion testing· Conversion set

Sample-Rate Set — 440 Hz @ 44100 Hz

Same 440 Hz tone rendered at 44100 Hz sample rate — twin in the 8k/16k/44.1k set.

File: WAV · Sample Rate Set · 0.6 s
Use case: Audio analysisConversion testing· Conversion set

Sample-Rate Set — 880 Hz @ 8000 Hz

880 Hz tone at 8000 Hz — second ladder for resampling QA.

File: WAV · Sample Rate Set · 0.5 s
Use case: Audio analysisConversion testing· Conversion set

Sample-Rate Set — 880 Hz @ 16000 Hz

880 Hz tone at 16000 Hz — second ladder for resampling QA.

File: WAV · Sample Rate Set · 0.5 s
Use case: Audio analysisConversion testing· Conversion set

Sample-Rate Set — 880 Hz @ 44100 Hz

880 Hz tone at 44100 Hz — second ladder for resampling QA.

File: WAV · Sample Rate Set · 0.5 s
Use case: Audio analysisConversion testing· Conversion set

DTMF Sequence — 1234

Synthetic DTMF tone sequence for digits “1234”. Pair with the transcript JSON.

File: WAV · Dtmf · 16000
Use case: ASR testingAudio analysis· Paired fixture

DTMF Sequence — 567890

Synthetic DTMF tone sequence for digits “567890”. Pair with the transcript JSON.

File: WAV · Dtmf · 16000
Use case: ASR testingAudio analysis· Paired fixture

DTMF Sequence — *9#

Synthetic DTMF tone sequence for digits “*9#”. Pair with the transcript JSON.

File: WAV · Dtmf · 16000
Use case: ASR testingAudio analysis· Paired fixture

DTMF Sequence — 042

Synthetic DTMF tone sequence for digits “042”. Pair with the transcript JSON.

File: WAV · Dtmf · 16000
Use case: ASR testingAudio analysis· Paired fixture

DTMF Sequence — 13579

Synthetic DTMF tone sequence for digits “13579”. Pair with the transcript JSON.

File: WAV · Dtmf · 16000
Use case: ASR testingAudio analysis· Paired fixture

Silence-in-Middle — Short Gap

440 Hz tone with 0.25s of digital silence in the middle (0.4s + silence + 0.4s). Fixture for mid-gap trim / split tools.

File: WAV · Silence Middle · 16000
Use case: Auto-trim testingAudio analysis· Conversion set

Silence-in-Middle — Medium Gap

440 Hz tone with 0.75s of digital silence in the middle (0.5s + silence + 0.5s). Fixture for mid-gap trim / split tools.

File: WAV · Silence Middle · 16000
Use case: Auto-trim testingAudio analysis· Conversion set

Silence-in-Middle — Long Gap

440 Hz tone with 1.5s of digital silence in the middle (0.4s + silence + 0.4s). Fixture for mid-gap trim / split tools.

File: WAV · Silence Middle · 16000
Use case: Auto-trim testingAudio analysis· Conversion set

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 testingAudio analysis· Conversion set

Silence-in-Middle — Asym Trail

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

File: WAV · Silence Middle · 16000
Use case: Auto-trim testingAudio analysis· Conversion set

Silence-in-Middle — Tiny Gap

440 Hz tone with 0.08s of digital silence in the middle (0.35s + silence + 0.35s). Fixture for mid-gap trim / split tools.

File: WAV · Silence Middle · 16000
Use case: Auto-trim testingAudio analysis· Conversion set

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 testingAudio analysis

Convert v2 Yamaha SMAF Reference Tone

Real Yamaha SMAF audio payload encoded from the same deterministic 0.7-second mono reference tone for legacy import coverage. Stable P8 artifact p8-convert-legacy-mmf.

File: MMF · P8 Convert
Use case: Conversion testingAudio analysis

A/V Sync — Beep + Flash (MP4, with audio)

A five-second clip that flashes white and plays a 1 kHz beep on every whole second — the first clip in the library WITH an audio track. A direct fixture for measuring and correcting audio/video sync (lip-sync) offset.

File: MP4 · Sync · 480x270
Use case: Conversion testingAudio analysis

SMPTE Colour Bars + 1 kHz Tone (MP4)

Standard SMPTE-style colour bars with a 1 kHz reference tone — the classic broadcast test pattern. A fixture for calibrating colour, testing decoders, and verifying audio alongside a known video signal.

File: MP4 · Test Patterns · 480x270
Use case: Conversion testingAudio analysis

MP4 — A/V Mux with 440 Hz Tone

Video muxed with a 440 Hz sine tone — for A/V container and audio-track tests.

File: MP4 · Av · 480x270
Use case: Conversion testingAudio analysis· Conversion set

MP4 — A/V Mux with 880 Hz Tone

Video muxed with an 880 Hz tone — frequency twin for audio pipeline tests.

File: MP4 · Av · 480x270
Use case: Conversion testingAudio analysis· Conversion set

MP4 — Audio Desync 100ms

SAMPLE clip with audio delayed ~100 ms — for A/V sync detection tools.

File: MP4 · Av · 480x270
Use case: Conversion testingAudio analysis· Conversion set

MP4 — Audio Desync 250ms

SAMPLE clip with audio delayed ~250 ms — for A/V sync detection tools.

File: MP4 · Av · 480x270
Use case: Conversion testingAudio analysis· Conversion set

MP4 — Audio Desync 500ms

SAMPLE clip with audio delayed ~500 ms — for A/V sync detection tools.

File: MP4 · Av · 480x270
Use case: Conversion testingAudio analysis· Conversion set

MP4 — Colour Bars + 1 kHz Tone

SMPTE-ish colour bars with a 1 kHz reference tone — classic QC fixture.

File: MP4 · Bars · 480x270
Use case: Conversion testingAudio analysis· Paired fixture

Audio Editing Edge WAV 01

PCM edge waveform 01 carrying controlled hard clipping for edit-pipeline recovery checks. Stable P8 artifact p8-audio-edge-wav-01.

File: WAV · Editing Metadata Edge · 8000
Use case: Audio editingAudio analysis+1

Audio Editing Edge WAV 02

PCM edge waveform 02 carrying a controlled silence window for edit-pipeline recovery checks. Stable P8 artifact p8-audio-edge-wav-02.

File: WAV · Editing Metadata Edge · 8000
Use case: Audio editingAudio analysis+1

Audio Editing Edge WAV 03

PCM edge waveform 03 carrying controlled hard clipping for edit-pipeline recovery checks. Stable P8 artifact p8-audio-edge-wav-03.

File: WAV · Editing Metadata Edge · 8000
Use case: Audio editingAudio analysis+1

Audio Editing Edge WAV 04

PCM edge waveform 04 carrying a controlled silence window for edit-pipeline recovery checks. Stable P8 artifact p8-audio-edge-wav-04.

File: WAV · Editing Metadata Edge · 8000
Use case: Audio editingAudio analysis+1

Audio Editing Edge WAV 05

PCM edge waveform 05 carrying controlled hard clipping for edit-pipeline recovery checks. Stable P8 artifact p8-audio-edge-wav-05.

File: WAV · Editing Metadata Edge · 8000
Use case: Audio editingAudio analysis+1

Audio Editing Edge WAV 06

PCM edge waveform 06 carrying a controlled silence window for edit-pipeline recovery checks. Stable P8 artifact p8-audio-edge-wav-06.

File: WAV · Editing Metadata Edge · 8000
Use case: Audio editingAudio analysis+1

Audio Editing Edge WAV 07

PCM edge waveform 07 carrying controlled hard clipping for edit-pipeline recovery checks. Stable P8 artifact p8-audio-edge-wav-07.

File: WAV · Editing Metadata Edge · 8000
Use case: Audio editingAudio analysis+1

Audio Editing Edge WAV 08

PCM edge waveform 08 carrying a controlled silence window for edit-pipeline recovery checks. Stable P8 artifact p8-audio-edge-wav-08.

File: WAV · Editing Metadata Edge · 8000
Use case: Audio editingAudio analysis+1

Audio Editing Edge WAV 09

PCM edge waveform 09 carrying controlled hard clipping for edit-pipeline recovery checks. Stable P8 artifact p8-audio-edge-wav-09.

File: WAV · Editing Metadata Edge · 8000
Use case: Audio editingAudio analysis+1

Audio Editing Edge WAV 10

PCM edge waveform 10 carrying a controlled silence window for edit-pipeline recovery checks. Stable P8 artifact p8-audio-edge-wav-10.

File: WAV · Editing Metadata Edge · 8000
Use case: Audio editingAudio analysis+1

Video Sync Audio Reference 01

Download-only PCM sync reference 01 with a controlled transient pattern for aligning an external video timeline. Stable P8 artifact p8-video-sync-wav-01.

File: WAV · Colour Audio Sync Failures · 8000
Use case: Video QAAudio analysis+1

Video Sync Audio Reference 02

Download-only PCM sync reference 02 with a controlled transient pattern for aligning an external video timeline. Stable P8 artifact p8-video-sync-wav-02.

File: WAV · Colour Audio Sync Failures · 8000
Use case: Video QAAudio analysis+1

Video Sync Audio Reference 03

Download-only PCM sync reference 03 with a controlled transient pattern for aligning an external video timeline. Stable P8 artifact p8-video-sync-wav-03.

File: WAV · Colour Audio Sync Failures · 8000
Use case: Video QAAudio analysis+1

Video Sync Audio Reference 04

Download-only PCM sync reference 04 with a controlled transient pattern for aligning an external video timeline. Stable P8 artifact p8-video-sync-wav-04.

File: WAV · Colour Audio Sync Failures · 8000
Use case: Video QAAudio analysis+1

Video Sync Audio Reference 05

Download-only PCM sync reference 05 with a controlled transient pattern for aligning an external video timeline. Stable P8 artifact p8-video-sync-wav-05.

File: WAV · Colour Audio Sync Failures · 8000
Use case: Video QAAudio analysis+1

Video Sync Audio Reference 06

Download-only PCM sync reference 06 with a controlled transient pattern for aligning an external video timeline. Stable P8 artifact p8-video-sync-wav-06.

File: WAV · Colour Audio Sync Failures · 8000
Use case: Video QAAudio analysis+1

Video Sync Audio Reference 07

Download-only PCM sync reference 07 with a controlled transient pattern for aligning an external video timeline. Stable P8 artifact p8-video-sync-wav-07.

File: WAV · Colour Audio Sync Failures · 8000
Use case: Video QAAudio analysis+1

Video Sync Audio Reference 08

Download-only PCM sync reference 08 with a controlled transient pattern for aligning an external video timeline. Stable P8 artifact p8-video-sync-wav-08.

File: WAV · Colour Audio Sync Failures · 8000
Use case: Video QAAudio analysis+1

Video Sync Audio Reference 09

Download-only PCM sync reference 09 with a controlled transient pattern for aligning an external video timeline. Stable P8 artifact p8-video-sync-wav-09.

File: WAV · Colour Audio Sync Failures · 8000
Use case: Video QAAudio analysis+1

Video Sync Audio Reference 10

Download-only PCM sync reference 10 with a controlled transient pattern for aligning an external video timeline. Stable P8 artifact p8-video-sync-wav-10.

File: WAV · Colour Audio Sync Failures · 8000
Use case: Video QAAudio analysis+1