Appeal No. 1997-3182
Application 08/254,643
examiner has objected to claims 2 through 7, 9 through 14, 17
through 20, 23 through 26, 28 and 29 as being dependent upon a
rejected base claim, but indicated their allowability if
rewritten in independent form including all the limitations of
the base claim and any intervening claims.
Representative claim 1 is reproduced below:
1. A system for extracting a bass signal from left and
right audio input signals of a stereo signal, said system
comprising:
a differencing circuit generating a difference mode
signal from the left and right audio input signals;
a detector circuit generating a first coefficient of
proportionality that is a function of the relative phase of
the left and right input signals; and
a first multiplier circuit multiplying the first
coefficient of proportionality times the difference mode
signal to produce a modified difference mode signal, wherein
the modified difference mode signal is used to generate the
bass signal.
The following references are relied on by the examiner:
Ishikawa et al. (Ishikawa) 4,933,768 June 12,
1990
Fosgate WO 91/19407 Dec. 12, 1991
Robinson 1,175,362 Oct. 2,
1984
(Canadian Patent)
2
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