Appeal No. 2002-1197
Application 09/131,167
The examiner's findings that Koski acts "to freeze the
adaptation of the filter coefficients when the output signal of
the microphone . . . reaches a threshold that causes the detector
to freeze said coefficients" (FR2) and that "Koski states that
the filter coefficients of the adaptive filter will only be aloud
[sic, allowed] to update, i.e., they are frozen, unless the
signal from the microphone (the source) is below a value" (FR3)
are in error. As noted by appellant (Br11), Koski only freezes
adaptation of the filter coefficients when double talk exists,
not when the output signal of the microphone reaches a threshold.
The thresholds in Koski have to do with detection of double talk
and are not used for comparison with the output signal.
Claims 5, 7, 29, and 31
The examiner finds that Koski discloses updating filter
coefficients only when the output signal is at a predetermined
threshold value, referring to column 5, line 20, to column 6,
line 15 (FR6). The examiner states that "Koski discloses that
the threshold values are based in part on the distortion through
A to D conversion (see col. 4 lines 25-62)" (FR6).
Appellant argues that the combination of Koski and Haneda
does not disclose or suggest that the first predetermined
threshold value is less than or equal to an upper full-scale
value of the analog-to-digital converter (ADC) and that the
second predetermined threshold value is greater than or equal to
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