Sound Encoding Device And Sound Encoding Method
First Claim
1. A speech encoding apparatus comprising:
- a analysis section that performs MDCT analysis on one frame of a time-domain speech signal by both a long analysis length and a short analysis length to obtain two types of transform coefficients in a frequency domain; and
an encoding section that encodes the two types of transform coefficients.
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Abstract
A sound encoding device enabling the amount of delay to be kept small and the distortion between frames to be mitigated. In the sound encoding device, a window multiplication part (211) of a long analysis section (21) multiplies a long analysis frame signal of analysis length M1 by an analysis window, the resultant signal multiplied by the analysis window is outputted to an MDCT section (212), and the MDCT section (212) performs MDCT of the input signal to obtain the transform coefficients of the long analysis frame and outputs it to a transform coefficient encoding section (30). The window multiplication part (221) of a short analysis section (22) multiplies a short analysis frame signal of analysis length M2 (M2<M1) by an analysis window and the resultant signal multiplied by the analysis window is outputted to the MDCT section (222). The MDCT section (222) performs MDCT of the input signal to obtain the transform coefficients of the short analysis frame and outputs it to the transform coefficient encoding section (30). A transform coefficient encoding section (30) encodes these transform coefficients and outputs them.
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Citations
6 Claims
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1. A speech encoding apparatus comprising:
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a analysis section that performs MDCT analysis on one frame of a time-domain speech signal by both a long analysis length and a short analysis length to obtain two types of transform coefficients in a frequency domain; and
an encoding section that encodes the two types of transform coefficients. - View Dependent Claims (2, 3, 4, 5)
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6. A speech encoding method comprising the steps of:
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performing MDCT analysis on one frame of a time-domain speech signal by both a long analysis length and a short analysis length to obtain two types of transform coefficients in a frequency domain; and
encoding the two types of transform coefficients.
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Specification