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(11) | EP 0 381 507 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Silence/non-silence discrimination apparatus |
| (57) A speech signal is input to an LPC cepstrum calculator (51) and the LPC cepstrums
of the speech signal for each frame are calculated as characteristic parameters. The
cepstrum is input to a characteristic parameter projection circuit (54) including
an inner product calculator (53) and a memory (52) storing first to third priority
component vectors that are obtained by applying a priority component analysis to the
LPC cepstrums of the non-silent parts of the speech. The inner product calculator
(53) calculates inner products of the cepstrum vector and the priority component vectors
stored in the priority component vector memory (52) to obtain a projected point of
the LPC cepstrums in a vector space formed by the first to third priority component
vectors. The output of the inner product calculator (53) is supplied to a silence/non-silence
discriminator (56) to which a non-silent region parameter memory (55) storing parameters
defining a non-silent region in the non-silent priority component vector space. The
silence/non-silence discriminator (56) determines if the speech is silent or non-silent
based on whether the projected point is within the non-silent region. |