Reference audio for analysis

Pure tones, sweeps, and noise with known frequencies and levels for testing spectrum, level, and waveform tools.

Each card starts with one representative test file. 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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106 test families · 363 available files · Page 1 of 6

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

View details Download WAV

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

Choose a variant (5)

View details Download WAV

Reference Tones

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

View details Download WAV

Reference Tones

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

View details Download WAV

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)

View details Download WAV

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

View details Download WAV

Sync

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 testing / Audio analysis

View details Download MP4

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

Choose a variant (13)

View details Download AAC

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

View details Download AIFF

Container Formats

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.