Appeal No. 1996-2198
Application 08/077,506
function Bc and the corresponding state transition probability
distribution B are combined in second pattern forming circuit
18 to form a pattern P, which is stored in circuit 18 (Spec.
at 13, lines 1-10).
According to appellants, the converting circuit 15 and code
vector table 14 permit the first pattern forming circuit 16 to
rapidly generate the state transition probability distribution
A and the feature code occurrence probability distribution B
of the HMM (Brief at 3), while the approximate continuous
occurrence probability density function Bc gives a better
approximation of the actual probability than would probability
distribution B (Brief at 4).
B. The claims
Claim 1, which is representative, reads as follows:
1. A reference pattern generating device including:
a feature analyzer, responsive to a speech signal
representative of an input pattern, for producing a time
sequence of feature vectors representative of said input
pattern; a table storing a plurality of code vectors of known
vocabulary and a plurality of feature codes respectively
corresponding to said plurality of code vectors; converting
means, connected to said feature analyzer and said table, for
converting a plurality of time sequences of feature vectors to
a plurality of time sequence of feature codes with reference
-8-
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