Intel IPP status 15 (ippStsLSFLowAndHigh): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: LSF stability was clipped at both boundaries.

Could be also:
Constant	Type	OS
ERROR_INVALID_DRIVE	Win32 error	Windows
KERN_INVALID_NAME	Kern return	Mac
ENOTBLK	errno	Linux
ENOTBLK	errno	Mac
ENOTBLK	errno	Solaris
SPIN_LOCK_ALREADY_OWNED	BugCheck Code	Windows

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ippStsLSFHigh	ippStsZeroOcc

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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