Appeal No. 2003-0315
Application 09/122,988
preserves the directional information of the originating left and
right channel surround signals. See page 1 of Appellant’s
specification. Figure 1 is a block diagram illustrating the
logical arrangement of an embodiment of the invention having
matrix encode with split surround channels and first-order head
shading filter. See page 3 of Appellant’s specification. Figure
1 shows a left surround signal (Ls) and a right surround signal
(Rs) being summed by summer 21 to provide a monophonic surround
signal. The monophonic surround signal is filtered to provide a
filtered monophonic signal having properties related to the
diffraction pattern around the head of the listener (output
signal from differential amplifier 24 shown in figure 1). See
page 4 of Appellant’s specification. Figure 1 shows the filtered
monophonic signal being multiplied by multipliers 31 and 32 with
a time varying coefficient signal relating to the surround
signals. See page 5 of Appellant’s specification.
Claim 9 is reproduced as follows:
9. A method of downmixing a plurality of signals including
at least a left surround signal, a right surround signal, a left
front signal and a right front signal into a stereophonic pair
that is a left transmitted signal and a right transmitted signal
including,
summing the left surround and right surround signals to
provide a monophonic surround signal,
2
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