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 · 156 files · 17 subcategories

156 of 156 files

Asr

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 — 0123 Transcript (JSON)

Ground-truth transcript for the 0123 ASR utterance pair — expected text: “zero one two three”.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 1357 Transcript (JSON)

Ground-truth transcript for the 1357 ASR utterance pair — expected text: “one three five seven”.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 24680 Transcript (JSON)

Ground-truth transcript for the 24680 ASR utterance pair — expected text: “two four six eight zero”.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 4567 Transcript (JSON)

Ground-truth transcript for the 4567 ASR utterance pair — expected text: “four five six seven”.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 89 Transcript (JSON)

Ground-truth transcript for the 89 ASR utterance pair — expected text: “eight nine”.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 987654 Transcript (JSON)

Ground-truth transcript for the 987654 ASR utterance pair — expected text: “nine eight seven six five four”.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 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

ASR Extra — 0000 Transcript (JSON)

Ground-truth transcript for extra ASR utterance 0000.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 1111 Transcript (JSON)

Ground-truth transcript for extra ASR utterance 1111.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 2222 Transcript (JSON)

Ground-truth transcript for extra ASR utterance 2222.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 3333 Transcript (JSON)

Ground-truth transcript for extra ASR utterance 3333.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 4444 Transcript (JSON)

Ground-truth transcript for extra ASR utterance 4444.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 5555 Transcript (JSON)

Ground-truth transcript for extra ASR utterance 5555.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 6666 Transcript (JSON)

Ground-truth transcript for extra ASR utterance 6666.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 7777 Transcript (JSON)

Ground-truth transcript for extra ASR utterance 7777.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 8888 Transcript (JSON)

Ground-truth transcript for extra ASR utterance 8888.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 — 9999 Transcript (JSON)

Ground-truth transcript for extra ASR utterance 9999.

File: JSON · Asr
Use case: ASR testingJSON parsing· Conversion set

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 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

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

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

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

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 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

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

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

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

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

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

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

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

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

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

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 analysisConversion testing

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 — 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

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

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

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 — 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 — 13579

Synthetic DTMF tone sequence for digits “13579”. 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 Transcript — *9# (JSON)

Ground-truth digit transcript for the DTMF sequence *9#.

File: JSON · Dtmf
Use case: ASR testing· Paired fixture

DTMF Transcript — 042 (JSON)

Ground-truth digit transcript for the DTMF sequence 042.

File: JSON · Dtmf
Use case: ASR testing· Paired fixture

DTMF Transcript — 1234 (JSON)

Ground-truth digit transcript for the DTMF sequence 1234.

File: JSON · Dtmf
Use case: ASR testing· Paired fixture

DTMF Transcript — 13579 (JSON)

Ground-truth digit transcript for the DTMF sequence 13579.

File: JSON · Dtmf
Use case: ASR testing· Paired fixture

DTMF Transcript — 567890 (JSON)

Ground-truth digit transcript for the DTMF sequence 567890.

File: JSON · Dtmf
Use case: ASR testing· Paired fixture

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 / 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 — 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

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 — 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 — 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 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 — 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

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 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

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 / 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

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

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

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

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

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

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 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 @ 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 @ 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

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 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 — 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 — 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

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

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 analysisError handling

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

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

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

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

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

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 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 — 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 — 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 — 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 — 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

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 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

Stereo Mono

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

Tagged

FLAC 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 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

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

MP3 with ID3 Metadata Stripped

The same MPEG audio frames with leading and trailing ID3 metadata removed, for checking metadata scrubbing without an audio transcode.

File: MP3 · Tagged
Use case: Metadata testingConversion testing· Paired fixture

MP3 with ID3 Tags and Cover Art

An MP3 with deterministic ID3v2.3 text frames and embedded PNG cover art wrapped around unchanged MPEG audio frames.

File: MP3 · Tagged
Use case: Metadata testingConversion testing· Paired fixture

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.