Appeal 2007-3257
Application 10/046,632
Appellant’s invention relates to a parametric encoder and a method for
encoding an audio or speech signal into sinusoidal code data (Specification
1). According to Appellant, improvements to a known parametric encoder
embodied in the claimed subject matter provide for establishing a required
time-frequency resolution trade-off without scattering of components over
various scales and/or merging the data retrieved at different scales
(Specification 2). The claimed invention requires a segmentation unit to
carry out a frequency-warping operation in order to transform the output
samples onto a frequency-warped domain and to provide a post-processing
filter for re-mapping the sinusoidal code data output from the sinusoidal
estimation unit to the original frequency domain of the input signal (id.).
Claim 1 is representative of the claimed subject mater and reads as
follows:
1. A parametric encoder for encoding an audio or speech
signals s into sinusoidal code data, comprising:
a segmentation unit (120) for segmenting said signal s into at
least one single scale segment xm(n) with m = 1 . . . M and for
outputting the samples xm(0), . . . , xm(L-1) of said segment xm(n); and
a sinusoidal estimation unit (140) for estimating the sinusoidal
code data respresenting said segment xm(n) from the received samples
xm(0), . . . , x m(L-1); characterized in that
the segmentation unit (120) is further embodied for carrying out
a frequency-warping operation in order to transform the output
samples x m(0), . . . , xm(L-1) onto a frequency-warped domain; and
a post-processing filter (160) is provided for re-mapping said
sinusoidal data output from the sinusoidal estimation unit (140) to an
original frequency domain of the signals.
2
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