SAM_SCOR (Sam Input Assessment
SAM software tools
SAMITPRO (SAM Iterative Proportional
SAM_REC0 Isolated Word Recogniser
1.0 November l990 (corrections released January l991)
Hardware / OS requirements:
workstation, equipped with O
AU21 (or AU 22) DSP board and the library DISK_TRA of the recording software that accompanies O
The software implements an isolated word recogniser.
A word is recorded and endpoint detection is then carried out by analysing an energy contour and the zero crossing rate.
The endpointed word is preemphasised and windowed by a Hamming window.
Discrete Fourier transforms are calculated over the word.
The transform samples are filtered by a filter bank of triangular filters, linearly distributed in frequency up to 1 kHz and logarithmically distributed above 1kHz.
From the filter outputs cepstrum coefficients are calculated.
The time warping uses eight cepstrum coefficients per frame, allows local time distortions between 50% and 200% and is based on a symmetric slope constraint with P=1.
The word chosen is the word among the reference templates with the smallest distance to the recorded word.
Systems Research, Spoken Language Processing
S - 136 80 Haninge
Tel: (+46) 8 707 55 72
Fax: (+46) 8 707 55 96
Gunnar Hult, Room A309
EAGLES SWLG SoftEdition, May 1997.
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