This is the accompanying page for the article Dequantization of a signal from two parallel quantized observations authored by Vojtěch Kovanda and Pavel Rajmic, submitted to ICASSP 2025.
We propose a technique of signal acquisition using a combination of two devices with different sampling rates and quantization accuracies. Subsequent processing involving sparsity regularization enables us to reconstruct the signal at such a sampling frequency and with such a bit depth that was not possible using the two devices independently. Objective and subjective tests show the superiority of the proposed method in comparison with alternatives.
The preprint is available at arXiv.
Audio examples from the listening test
You can listen to all audio excerpts used in the listening test.Bass guitar
| Original audio (x) | |
| Quantized audio (y2, effectively 8 bps) | |
| Reconst. via the CP algorithm (CP(y2)) | |
| Dithered version (dither(y2), 8 bps) | |
| our reconstruction from y1 and y2 |
Cello 1
| Original audio (x) | |
| Quantized audio (y2, effectively 8 bps) | |
| Reconst. via the CP algorithm (CP(y2)) | |
| Dithered version (dither(y2), 8 bps) | |
| our reconstruction from y1 and y2 |
Cello 2
| Original audio (x) | |
| Quantized audio (y2, effectively 8 bps) | |
| Reconst. via the CP algorithm (CP(y2)) | |
| Dithered version (dither(y2), 8 bps) | |
| our reconstruction from y1 and y2 |
Harpsichord
| Original audio (x) | |
| Quantized audio (y2, effectively 8 bps) | |
| Reconst. via the CP algorithm (CP(y2)) | |
| Dithered version (dither(y2), 8 bps) | |
| our reconstruction from y1 and y2 |
Organ
| Original audio (x) | |
| Quantized audio (y2, effectively 8 bps) | |
| Reconst. via the CP algorithm (CP(y2)) | |
| Dithered version (dither(y2), 8 bps) | |
| our reconstruction from y1 and y2 |
Trumpets
| Original audio (x) | |
| Quantized audio (y2, effectively 8 bps) | |
| Reconst. via the CP algorithm (CP(y2)) | |
| Dithered version (dither(y2), 8 bps) | |
| our reconstruction from y1 and y2 |
Violin 1
| Original audio (x) | |
| Quantized audio (y2, effectively 8 bps) | |
| Reconst. via the CP algorithm (CP(y2)) | |
| Dithered version (dither(y2), 8 bps) | |
| our reconstruction from y1 and y2 |
Violin 2
| Original audio (x) | |
| Quantized audio (y2, effectively 8 bps) | |
| Reconst. via the CP algorithm (CP(y2)) | |
| Dithered version (dither(y2), 8 bps) | |
| our reconstruction from y1 and y2 |