• Speech Analysis: Spectral envelopes can be used to analyze speech patterns. This can help in understanding language development, speech disorders, and the effectiveness of speech therapy. For example, the spectral envelope can reveal the characteristics of different phonemes and how they are produced by individuals with speech impairments.
• Emotion Recognition: The spectral envelope can be used to analyze vocal expressions of emotions. By examining the frequency and amplitude characteristics of speech, researchers can identify patterns associated with different emotional states. This can be useful in developing tools for emotion recognition and improving communication aids for individuals with emotional or social difficulties.
• Cognitive Load Measurement: In educational settings, the spectral envelope can be used to measure cognitive load by analyzing the speech of students. Changes in the spectral envelope can indicate levels of stress or cognitive effort, providing insights into how students are coping with learning tasks.
• Music Therapy: Spectral envelopes can be used to analyze the acoustic properties of music and its impact on psychological well-being. By understanding how different frequencies and amplitudes affect mood and cognition, researchers can develop more effective music therapy interventions.

Important note: Spectral envelope is part of the spectral analysis methods in time series statistics.@