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- W2078014790 abstract "There is an unpleasant artifact in narrow-band spectrograms that is caused by filtering. If the filter straddles the trough between two pitch bars of equal amplitude, even if the bars lie out in the skirts of the filter, they beat together causing spots in the spectrogram (at the fundamental frequency). Where pitch bars have small slopes this sometimes gives rise to a look of “beads-on-a-chain” in the trough. At high slopes it can break up the pitch bars, producing apparent lines that may be orthogonal to the pitch bars. The artifact can be eliminated by smoothing in the direction of the pitch bars. This direction can be found during calculation of digital (e.g., FFT) spectrograms. Nearby spectra (sections) of voiced speech are essentially identical, except that one is a “stretch” of the other. The stretch that makes them the most similar specifies the direction of the pitch bars at every frequency. Local smoothing of the picture in this direction eliminates the artifact without loss or smearing of speech information. Spectrograms of speech with and without smoothing will be shown. Directional smoothing may also be useful in enhancing noisy speech." @default.
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- W2078014790 date "1984-10-01" @default.
- W2078014790 modified "2023-09-25" @default.
- W2078014790 title "Elimination of an artifact from narrow‐band digital speech spectrograms" @default.
- W2078014790 doi "https://doi.org/10.1121/1.2021744" @default.
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