public class Blizzard09PostProcessor
This class implements post-processing of TTS output to make it sound more intelligible when used in a telephone channel.
Several simple ideas are implemented:
(Step 1) Increasing relative energy of consonants (requires labels along with TTS wav outputs, with the same filename and
folder but with .lab extension) (Step 2) Sharpening formants explicitly using LSFs (Step 3) Increasing relative energy of
higher formants implicitly by adding highpass filtered version to original (Step 4) Finally, the output is gain adjusted to