ENCODING DEVICE AND ENCODING METHOD
First Claim
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1. An encoding apparatus comprising:
- a shape codebook that outputs a vector candidate in a frequency domain;
a control section that controls a distribution of pulses in the vector candidate according to sharpness of peaks in a spectrum of an input signal; and
an encoding section that encodes the spectrum using the vector candidate after distribution control.
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Abstract
Disclosed is an encoding device and others capable of suppressing quantization distortion while suppressing increase of a bit rate when encoding audio or the like. In the device, a dynamic range calculation unit (12) calculates a dynamic range of an input spectrum as an index indicating a peak of the input spectrum, a pulse quantity decision unit (13) decides the number of pulses of a vector candidate outputted from a shape codebook (14), and a shape codebook (14) outputs a vector candidate having the number of pulses decided by the pulse quantity decision unit (13) according to control from the search unit (17) by using a vector candidate element {−1, 0, +1}.
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Citations
10 Claims
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1. An encoding apparatus comprising:
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a shape codebook that outputs a vector candidate in a frequency domain; a control section that controls a distribution of pulses in the vector candidate according to sharpness of peaks in a spectrum of an input signal; and an encoding section that encodes the spectrum using the vector candidate after distribution control. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A encoding method comprising:
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controlling distribution of pulses in a vector candidate in a frequency domain according to sharpness of peaks in a spectrum of an input signal; and encoding the spectrum using the vector candidate after distribution control.
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Specification