Appeal No. 1996-1767 Page 8
Application No. 08/220,410
adder/multiplier network (AMN) to output two output signals,
said two output signals being outputted at the predetermined
sampling frequency of the input means ....” Claim 14
similarly specifies in pertinent part “transmitting both of
said first signal and said second signal into a first stage of
said electric circuit at a predetermined sampling frequency;
... and transmitting said output both of said first signal and
said second signal to be outputted from said electric circuit
at the predetermined sampling frequency.” The appellants
erred by reading limitations from their specification into
claims 1 and 14. Giving the claims their broadest reasonable
interpretation, they recite inputting and outputting signals
at the same frequency.
Comparison of Hirosaki to the claim language evidences
that the reference teaches inputting and outputting signals at
the same frequency. Hirosaki discloses a “rate conversion
digital filter having a simplified structure.” Col. 1, ll.
28-30. The filter samples first and second data streams at a
frequency of 1/T. The digital filter includes a first and
second selector for alternately and complementarily selecting
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