What do both wideband and narrowband analyses allow you to observe?

Both wideband and narrowband analyses provide valuable information about the acoustic signal, particularly in terms of frequency resolution and temporal aspects. However, the correct answer focuses on their capability to assess amplitude changes in the speech signal.

Narrowband analysis offers a clear view of frequency components within a specific bandwidth, highlighting where energy is concentrated at various frequencies. This can help identify pitch and tonal qualities, but it is during the observation of amplitude that speech characteristics and fluctuations can be most effectively analyzed. Similarly, wideband analysis captures rapid changes over time, allowing for detailed insight into how speech sounds evolve, including variations in amplitude. Both analyses highlight the dynamics of speech sounds and changes in intensity, making them essential tools in understanding speech production and perception.

Thus, the ability to observe changes in amplitude encompasses vital aspects of speech that both analytical approaches excel at, reinforcing this as the correct answer.