Which feature is notably easier to interpret in wideband spectrograms?

Wideband spectrograms are particularly useful for examining formant frequencies in the speech signal. This is due to their design, which emphasizes temporal resolution over frequency resolution. Because wideband spectrograms use a shorter analysis window, they can capture rapid changes in the signal, making it easier to see the frequency patterns associated with formants, which are the resonant frequencies of the vocal tract that shape vowel sounds.

Formants appear as prominent bands in wideband spectrograms, allowing for a clearer and more detailed interpretation of vowel quality and speech sounds. The visual representation shows how formant frequencies shift depending on the articulation of different vowels, thus aiding in the analysis of speech sounds.

In contrast, while harmonics, pitch changes, and voice onset are also represented in spectrograms, they may not be as easily discernible in wideband formats. Harmonically-related frequencies can become less distinct, pitch changes might be harder to analyze due to the emphasis on temporal rather than spectral information, and voice onset may require a different kind or resolution of spectrogram for clarification. Therefore, formant frequencies stand out as the most interpretable feature in wideband spectrograms.