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| Kepstraalianalyysi× | Puheen ymmärrettävyys× | |
|---|---|---|
| Tieteenala | Akustiikka | Akustiikka |
| Menetelmäperhe | Process / pipeline | Process / pipeline |
| Syntyvuosi≠ | 1963 | 1980 |
| Kehittäjä≠ | Bogert, Healy, Tukey | Herman Steeneken, Tammo Houtgast |
| Tyyppi≠ | Spectral decomposition method | Speech clarity assessment method |
| Alkuperäislähde≠ | Bogert, B. P., Healy, M. J., & Tukey, J. W. (1963). The quefrency alanysis of time series for echoes: cepstrum, pseudo-autocovariance, cross-cepstrum, and saphe cracking. In Time Series Analysis Research Papers (pp. 209–243). Wiley. link ↗ | Steeneken, H. J., & Houtgast, T. (1980). A physical method for measuring speech-transmission quality. Journal of the Acoustical Society of America, 67(1), 318–326. DOI ↗ |
| Rinnakkaisnimet | cepstrum, MFCC, mel-frequency cepstral coefficients, spectral analysis | intelligibility metrics, STI, Speech Transmission Index, clarity index |
| Liittyvät | 5 | 5 |
| Tiivistelmä≠ | Cepstral analysis is a spectral analysis technique that decomposes signals into independent components by inverting the log-magnitude spectrum. Pioneered by Bogert, Healy, and Tukey in 1963, cepstral analysis reveals periodic structure in spectra (pitch, echo patterns) and separates source excitation from filter response. Mel-frequency cepstral coefficients (MFCCs) derived from cepstral analysis are the most widely used features in automatic speech recognition, speaker verification, and audio analysis. | Speech intelligibility is a quantitative measure of how well listeners understand spoken content in acoustic environments. Formalized by Steeneken and Houtgast in 1980 with the Speech Transmission Index (STI), intelligibility metrics combine room acoustic parameters (RT60, noise, clarity) to predict listener comprehension. Understanding speech intelligibility is essential for designing classrooms, offices, hearing aids, and public address systems where clear communication is critical. |
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