High-band speech coding apparatus and high-band speech decoding apparatus in wide-band speech coding/decoding system and high-band speech coding and decoding method performed by the apparatuses
First Claim
1. A high-band speech encoding apparatus in a wideband speech encoding system, the apparatus comprising:
- a first encoding unit encoding a high-band speech signal based on a structure in which a harmonic structure and a stochastic structure are combined, when the high-band speech signal has a harmonic component; and
a second encoding unit encoding a high-band speech signal based on a stochastic structure when the high-band speech signal has no harmonic components.
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Abstract
A high-band speech encoding apparatus and a high-band speech decoding apparatus that can reproduce high quality sound even at a low bitrate when wideband speech encoding and decoding using a bandwidth extension function, and a high-band speech encoding and decoding method performed by the apparatuses. The high-band speech encoding apparatus includes: a first encoding unit encoding a high-band speech signal based on a structure in which a harmonic structure and a stochastic structure are combined, if the high-band speech signal has a harmonic component; and a second encoding unit encoding a high-band speech signal based on a stochastic structure if the high-band speech signal has no harmonic components. The high-band speech decoding apparatus includes: a first decoding unit decoding a high-band speech signal based on a combination of a harmonic structure and a stochastic structure using received first decoding information; a second decoding unit decoding the high-band speech signal based on a stochastic structure using received second decoding information; and a switch outputting one of the decoded high-band speech signals received from the first and second decoding units according to received mode selection information.
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Citations
37 Claims
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1. A high-band speech encoding apparatus in a wideband speech encoding system, the apparatus comprising:
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a first encoding unit encoding a high-band speech signal based on a structure in which a harmonic structure and a stochastic structure are combined, when the high-band speech signal has a harmonic component; and
a second encoding unit encoding a high-band speech signal based on a stochastic structure when the high-band speech signal has no harmonic components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A wideband speech encoding system comprising:
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a band division unit dividing a speech signal into a high-band speech signal and a low-band speech signal;
a low-band speech signal encoding apparatus encoding the low-band speech signal received from the band division unit and outputting a pitch value of the low-band speech signal that is detected through the encoding; and
a high-band speech signal encoding apparatus encoding the high-band speech signal using the high-band and low-band speech signals received from the band division unit and the pitch value of the low-band speech signal. - View Dependent Claims (23)
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24. A high-band speech decoding apparatus comprising:
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a first decoding unit decoding a high-band speech signal based on a combination of a harmonic structure and a stochastic structure using received first decoding information;
a second decoding unit decoding the high-band speech signal based on a stochastic structure using received second decoding information; and
a switch outputting one of the decoded high-band speech signals received from the first and second decoding units according to received mode selection information. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A wideband speech decoding system comprising:
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a high-band speech signal decoding apparatus decoding a high-band speech signal using decoding information received via a channel using one of a stochastic structure and a combination of a harmonic structure and the stochastic structure;
a low-band speech signal decoding apparatus decoding a low-band speech signal using decoding information received via the channel; and
a band combination unit combining the decoded high-band speech signal with the decoded low-band speech signal to output a decoded speech signal.
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31. A high-band speech encoding method in a wideband speech encoding system, comprising:
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determining whether a high-band speech signal and a low-band speech signal have harmonic components;
encoding the high-band speech signal based on a combination of a harmonic structure and a stochastic structure when both the high-band and low-band speech signals have harmonic components; and
encoding the high-band speech signal based on a stochastic structure when any one of the high-band and low-band speech signals does not have a harmonic component. - View Dependent Claims (32, 33, 34, 35, 36)
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37. A high-band speech decoding method, comprising:
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analyzing mode selection information included in received decoding information;
decoding a high-band speech signal based on the received decoding information using a combination of a harmonic structure and a stochastic structure when the mode selection information represents a mode in which a harmonic structure and a stochastic structure are combined; and
decoding the high-band speech signal based on the received decoding information using a stochastic structure when the mode selection information represents a stochastic structure.
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Specification