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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

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

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

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

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

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

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

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

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