Appeal No. 1997-0795
Application 08/087,362
Drewery . . . offers no comment on these lines concerning continuous carrier
signals at line harmonic frequencies or their spectral properties. Rather,
Drewery . . . indicate that the positions at which digital samples are taken
can be horizontally interleaved from line to line, even though the samples are
taken at twice color subcarrier rate, by introducing a time perturbation of one
quarter of a subcarrier period between each pair of lines." (Reply brief,
pages 5-6.)
Appellants further point out that Drewery teaches that
with respect to the intraframe analysis of signals by two dimensional spatial
Fourier transforms, the modulation signals generated by this sampling
procedure has essential spectral properties identical to those generated by
conventional sampling procedures in which the samples are in a continuous
half-line offset frequency from a multiple of scan line frequency. (Reply brief,
page 6.)
Appellants further argue that the Examiner has failed to establish that there is any
meaningful analogy between apparatus for carrying out the Drewery perturbation of digital
sampling intervals and Appellants' claimed
means for reversing at said prescribed scan line rate the phase of the carrier
signal appearing at one of said terminals of said multiplier, each reversal
being at a respective instant between successive scan lines, thereby to
convert said product signal into a reversed-spectrum video signal with line to
line inversion of senses of phase
as defined in independent claim 35, or Appellants' claimed
means for reversing the phase of the carrier at said prescribed scan line
rate, each reversal being at a respective instant between successive scan
lines, thereby to supply a folding carrier
as defined in claim 52.
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