DTMF Sequence — *9#
Synthetic DTMF tone sequence for digits “*9#”. Pair with the transcript JSON.
Specifications
- Digits
- *9#
- Sample Rate
- 16000
- Kind
- DTMF
- Seed
- 2203
Testing contract
Expected to pass- Scenario
- Exercise DTMF Sequence — *9# in its dtmf workflow. Synthetic DTMF tone sequence for digits “*9#”.
- Expected result
- PCM contains 11200 frames at 16000 Hz; 1 channel(s), 16 bits/sample; duration is 0.700000 seconds. Declared feature checks: digits=*9#; sampleRate=16000; kind=DTMF. The declared comparison counterpart is aud-we-dtmf-star9hash-json; preserve the stated difference instead of expecting the container bytes to match.
What is a .wav file?
WAV (Waveform Audio) is a RIFF-based container that typically holds uncompressed linear PCM audio, though it can wrap other codecs. Because samples are stored raw, files are large but lossless and simple to read, with configurable sample rate, bit depth, and channel count. It is the standard format for high-fidelity and intermediate audio.
How to use this file
Use an example WAV to test PCM decoding, sample-rate and bit-depth handling, waveform rendering, and audio pipelines that need a lossless reference source.
How to use this file for testing
“DTMF Sequence — *9#” is a deterministic Novus Examples fixture for ASR testing, Audio analysis. Short synthetic digit/tone utterances with transcript JSON and clean↔noise pairs, for testing ASR loaders, WER harnesses, and audio preprocessing.
Documented properties for this file: seed 2203 · 16000 Hz. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such, expect parsers to fail loudly rather than silently accept them.
Media fixtures are short and synthetic by design. Prefer waveform or transcript ground truth in the same group when measuring ASR, trim, upscale, or sync tools; do not assume broadcast-quality masters.
Run ASR on the clip and score the transcript against the documented ground-truth script; clips are short, synthetic, and read from a fixed word or digit sequence.
Code examples
<audio controls preload="none" src="dtmf-star9hash.wav"></audio>Related files
- wavDTMF Sequence — 042Synthetic DTMF tone sequence for digits “042”. Pair with the transcript JSON.
- wavDTMF Sequence — 1234Synthetic DTMF tone sequence for digits “1234”. Pair with the transcript JSON.
- wavDTMF Sequence — 13579Synthetic DTMF tone sequence for digits “13579”. Pair with the transcript JSON.
- wavDTMF Sequence — 567890Synthetic DTMF tone sequence for digits “567890”. Pair with the transcript JSON.
- wavASR — 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.
- wavASR — 0123 Noisy (WAV)Noisy twin of the digit sequence 0123 at ~7 dB SNR. Score ASR against the shared transcript JSON.
Generated by generation/audio_wave_e.py. Free for any use, no attribution required, license.