Did you read the paper A Real-Time Wideband Neural Vocoder at 1.6 kb/s Using
LPCNet ??
The last sentence of the last paragraph is as following: In addition, using
the encoded excitation as an ex-tra input to LPCNet may help further reducing
artifacts, turning LPCNet into a neural post-filter that can significantly
improvethe quality of any existing low-bitrate waveform codec.
I am quite confused, what is the encoded excitation ? sinusoids in your codec 2
??
And, how to use the encoded excitation as an ex-tra input to LPCNet for further
reducing artifacts ?
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