Adaptive bit allocation of tonal and noise components
First Claim
Patent Images
1. A method for encoding audio information, comprising the steps of:
- converting input information signals of plural channels into frequency components;
separating the frequency components into a first signal made up of tonal components and a second signal made up of other components from one channel to another;
encoding said first signal from one channel to another; and
encoding said second signal with a number of bits adaptively allocated among the plural channels based upon the second signals of the plurality of channels.
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Abstract
The input signal of one of the plural channels is converted by a converting circuit into frequency components which are separated into tonal components and noise components in a signal comment separating circuit. The tonal components and the signal components are encoded by a tonal component encoding circuit and a noise component encoding circuit, respectively. The amount of bytes allocated to the noise components in the respective channels is determined by a byte allocation circuit based upon time changes of the sum of the scale factors of the respective channels.
49 Citations
8 Claims
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1. A method for encoding audio information, comprising the steps of:
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converting input information signals of plural channels into frequency components; separating the frequency components into a first signal made up of tonal components and a second signal made up of other components from one channel to another; encoding said first signal from one channel to another; and encoding said second signal with a number of bits adaptively allocated among the plural channels based upon the second signals of the plurality of channels. - View Dependent Claims (2, 3)
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4. An apparatus for encoding audio information, comprising:
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converting means for converting input information signals of plural channels into frequency components; separating means for separating the frequency components into a first signal made up of tonal components and a second signal made up of other components from one channel to another; first encoding means for encoding said first signal;
second encoding means for encoding said second signal; andbyte allocating means for determining amounts of byte allocation to the plural channels for encoding said second signal based upon information of the second signals of respective channels. - View Dependent Claims (5, 6)
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7. A method for decoding audio information in which a code string obtained by converting input information signals of plural channels into frequency components, separating the frequency components into a first signal made up of tonal components and a second signal made up of remaining components from one channel to another, encoding said first signal from one channel to another, and encoding said second signal with the number of bits adaptively allocated among the channels based upon the signals of the entire channels is decoded, comprising the steps of:
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separating said code string into a code of said first signal and a code of said second signal, from one channel to another; decoding said code of said first signal and the code of said second signal for producing the first signal made up of tonal components and the second signal made up of other components; and synthesizing said first and second signals.
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8. An apparatus for decoding audio information, comprising:
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code string resolving means for resolving a code string of plural strings into a code of a first signal made up of tonal components and a code of a second signal made up of other components; first decoding means for decoding the code of said first signal from said code string resolving means from one channel to another; second decoding means for decoding the code of said second signal from said code string resolving means from one channel to another; and synthesizing means for synthesizing signals of said first and second decoding means from one channel to another.
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Specification