Appeal No. 1997-2474 Page 3
Application No. 08/125,590
Claim 24, which is representative for our purposes,
follows:
24. A digital signal processing apparatus for
performing a forward discrete cosine transform,
comprising:
means for receiving a digital input signal
including a sequence of input signal amplitude
values; a memory containing look up tables
having a number of entries equal to a number of
possible input signal amplitude values, and
corresponding to values of Nth order forward
Discrete Cosine Transform basis functions stored at
memory addresses corresponding to input signal
amplitude values;
means for outputting a digital output signal
including a sequence of up to N output coefficient
values;
a central processing unit operatively connected
to the means for receiving, to the memory and to the
means for outputting; and
a control store of central processing unit
instructions connected so as to provide the
instructions to the central processing unit, the
control store containing instructions to address the
memory as a function of the input signal amplitude
values received by the means for receiving,
instructions to sum values obtained by addressing
the memory so as to form output coefficient values,
and instructions to provide the output coefficient
values to the means for outputting.
The references relied on in rejecting the claims follow:
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