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ippStsLSFLowAndHigh
This warning means the stability check constrained quantized line spectral frequencies at both ends of the valid interval. That is a stronger signal than a single boundary adjustment.
The frame may still be decoded, but the spectral envelope has been forced into a stable range. Treat repeated occurrences as evidence to inspect the speech bitstream, quantizer state and packet-loss recovery path.
Check these details
- Low-end and high-end LSF values in the same frame.
- Quantizer indices and mode-specific codebook selection.
- Packet corruption or concealment logic feeding the decoder.
Intel IPP Error Reporting · Intel IPP Signal Processing Reference · ITU-T G.729 speech coding
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