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ISM4 with noise signal -- Spectrum appears repeated in IGF region

Basic info

  • Commit SHA: cf46c019
  • Platform: Windows and Linux

Bug description

Running ISM 4 with an artificial signal of one noise signal and the rest zeroes, the output signal looks and sounds strange. It seems like the spectrum above 6.4 kHz is somehow repeated.

image

Ways to reproduce

git checkout cf46c019ea5564e7a1902b525a687a536a0c54d2
make -j
IVAS_cod -ism 4 NULL NULL NULL NULL 128000 48 ism4_1noise.wav bit
IVAS_dec EXT 48 bit out.wav

ism4_1noise

Edited by norvell