Appeal No. 1999-0437
Application 08/627,249
discussion of the prior art. Appellants respond that error
activity and error entropy are two different statistical
characteristics of a single distortion measure. Appellants
also argue that the prior art systems disclosed by Hollier do
not use a plurality of distortions as claimed.
We agree with appellants. Except for the background
of the invention section of Hollier, Hollier is directed to a
speech analysis system which uses the original speech input
signal in the distortion analysis [note line 9 in Figure 2].
Thus, the error activity and error entropy measures of
distortion in Hollier are applied to a speech signal using a
known corrupted speech signal. Independent claims 1, 10 and
19 all recite that the evaluation is based on an unknown
corrupted speech signal derived from an unavailable clean
speech signal. The invention of Hollier is not related to
such a speech analysis system.
The examiner attempts to avoid this problem by noting
that Hollier recognized output-based systems in the discussion
of the background of the invention. While this is true,
Hollier’s discussion of the background of the invention merely
notes that it was known to apply a single conventional measure
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