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EP0854469A2
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Speech encoding apparatus and method
Assignee: Mitsubishi Electric Corp
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Filing: 1994-05-04
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Granted: —
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Expires: 2014-05-04
Abstract
Abstract A speech analysis means and a window locating means are implemented in a speech coding apparatus. The speech coding apparatus encodes input speech per analysis frame defined having a fixed length and is offset at fixed interval. The speech analysis means extracts frequency spectrum characteristic parameters of the input speech taken within an analysis window. The location of the analysis window is specified by the window locating means. The window locating means selects the location of the analysis window which is used in extracting the frequency spectrum characteristic parameters at the speech analysis means. In this case, depending upon the characteristic parameter of the input speech within and near the frame concerned, the window locating means selects the location of the analysis window within the range which is not to be exceeding the range of the frame concerned.
Inventors
- 👤 Jun Ishii
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 10:04
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/04; G10L19/06; G10L19/002; G10L19/02; G10L19/0212; G10L19/16; G10L19/18; G10L19/24; G10L19/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A speech coding apparatus for coding input
speech within an analysis window of an analysis
frame, comprising: (a) window locating means for defining a plurality
of analysis windows at different locations
in the analysis frame, for receiving
an input speech within each of the analysis
windows, for calculating a predefined feature
of the input speech within each analysis
window, for comparing the calculated
features of each analysis window, and for
selecting an analysis window based on a
result of the comparison; (b) speech analysis means for extracting characteristic
parameters of the input speech
in the selected analysis window selected by
the window locating means; and (c) coding means for receiving the characteristic
parameters and for encoding the characteristic
parameters.
Claim 2
Dependent Claim
32 words
The speech coding apparatus of claim 1, wherein
the predefined feature is a power of the input
speech, and wherein the analysis window having a
maximum power value is the window selected.
Claim 3
Dependent Claim
56 words
The speech coding apparatus of claim 1 or 2,
wherein the speech analysis means comprises:
means for providing a second analysis window
different from the selected analysis window; and
means for calculating a value of power of the
input speech within the second analysis window
and for outputting the calculated power value to
the coding means.
Claim 4
Dependent Claim
24 words
The speech coding apparatus of claim 3, wherein
a center of the second analysis window is placed
at a center of the analysis frame.
Claim 5
Dependent Claim
35 words
The speech coding apparatus of claim 3, wherein
the analysis frame has a fixed frame length and
the second analysis window has a window length
which is substantially the same as the analysis
frame length.
Claim 6
Dependent Claim
28 words
The speech coding apparatus of claim 1, wherein
the selected analysis window is the window
having a center which is substantially in the
center of the analysis frame.
Claim 7
Dependent Claim
32 words
The speech coding apparatus of claim 1, wherein
the analysis frame has a fixed length and the
analysis window has a window length which is
substantially the same as the frame length.
Claim 8
Dependent Claim
36 words
The speech coding apparatus of claim 1, wherein
the predefined feature is a spectrum of the input
speech and wherein the comparison is a comparison
of the spectrums of the input speech
within each analysis window.
Claim 9
Dependent Claim
38 words
The speech coding apparatus of claim 1, wherein
the predefined feature is an auto correlation of
the input speech within each analysis window and
wherein the analysis window whose auto correlation
function shows periodicity is the window
selected.
Claim 10
Dependent Claim
86 words
A speech coding method for encoding input speech
within a selected analysis window of an analysis
frame, comprising the steps of: (a) creating an analysis window having a location
in the analysis frame; (b) calculating a value of power of the input
speech within the analysis window; (c) repeating the above steps, wherein each new
analysis window is created at a different
location within the analysis frame; (d) comparing the power values for each analysis
window and selecting the analysis
window having a maximum power value.
Claim 11
Dependent Claim
57 words
The speech coding method of claim 10, further
comprising the steps of: (a) extracting characteristic parameters of the
input speech within the selected analysis
window; (b) creating a second analysis window and calculating
a value of power of the input
speech within the second analysis window;
and (c) encoding the extracted characteristic parametes
and the calculated power.
References Cited (Backward Citations)
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