Appeal 2007-0018
Application 10/107,262
most significant bits (MSBs)) to adjust the sign of the sine and cosine value
pair (Fig. 2 of Hu), as in the disclosed and claimed invention. One of
ordinary skill in the art seeking to implement a sine/cosine instruction would
have motivated to employ the circuitry in Hu to calculate sine/cosine values
for the stated advantages of a reduced ROM LUT. However, we do not find
a teaching of a sine/cosine instruction in Hu.
Incrementing a phase value
Although we reverse the rejection, we consider appellant's argument
that Hu does not disclose "incrementing a phase value, if the phase value is
to be incremented," as recited in claim 1 (Br. at 6). The examiner's position
was that the phase accumulator 2 in Hu corresponds to this limitation.
Appellant argues that the purpose of the phase accumulator is to calculate an
output frequency to be used as an input address to a ROM look-up table and
does not discuss the use for incrementing a phase value (Br. at 7).
The examiner responds that the phase accumulator accumulates, sums,
or increments a phase (Answer 4).
Appellant replies that accumulating is not the same as summing or
incrementing (Reply Br. 3). It is argued that the Examiner fails to address
the statement in the abstract that "[t]he phase accumulator input provides a
control word which determines the intermediate frequency of the direct
digital synthesizer output" and Hu does not discuss the use of the phase
accumulator for the purpose of incrementing a phase value at all (id.).
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