Log-spectral distance (LSD) is a measure used primarily in signal processing and speech processing to quantify the difference between two spectral templates, often used to compare audio signals. It is especially useful in the context of evaluating the quality of speech synthesis, speaker verification, or in assessing the quality of audio signals. The basic idea behind LSD involves the following steps: 1. **Spectral Representation**: First, both signals (e.g.

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