ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF

• US 20100017198A1
• Filed: 12/14/2007
• Published: 01/21/2010
• Est. Priority Date: 12/15/2006
• Status: Active Grant

• Current Assignee: III Holdings 12, LLC (Intellectual Ventures LLC)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Oshikiri, Masahiro, Yamanashi, Tomofumi
• Granted Patent: US 8,560,328 B2
• Time in Patent Office: Days
• US Class Current: 704/205
• CPC Class Codes: G10L 19/24 Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
• CPC Class Codes: G10L 21/038 using band spreading techniques

Abstract

Disclosed is a decoding device and others capable of flexibly calculating high-band spectrum data with a high accuracy in accordance with an encoding band selected by an upper-node layer of the encoding side. In this device: a first layer decoding unit (202) decodes first layer encoded information to generate a first layer decoded signal; a second layer decoding unit (204) decodes second layer encoded information to generate a second layer decoded signal; a spectrum decoding unit (205) performs a band extension process by using the second layer decoded signal and the first layer decoded signal up-sampled in an up-sampling unit (203) so as to generate a all-band decoded signal; and a switch (206) outputs the first layer decoded signal or the all-band decoded signal according to the control information generated in a control unit (201).

Claims

1. An encoding apparatus comprising:

a first encoding section that encodes part of a low band that is a band lower than a predetermined frequency within an input signal to generate first encoded data;

a first decoding section that decodes the first encoded data to generate a first decoded signal;

a second encoding section that encodes a predetermined band part of a residual signal of the input signal and the first decoded signal to generate second encoded data; and

a filtering section that filters part of the low band of the first decoded signal or a calculated signal calculated using the first decoded signal, to obtain a band enhancement parameter for obtaining part of a high band that is a band higher than the predetermined frequency of the input signal.

2. The encoding apparatus according to claim 1, further comprising:

a second decoding section that decodes the second encoded data to generate a second decoded signal; and

an addition section that adds together the first decoded signal and the second decoded signal to generate an addition signal,

wherein the filtering section applies the addition signal as the calculated signal, filters part of the low band of the addition signal, to obtain the band enhancement parameter for obtaining part of a high band that is a band higher than the predetermined frequency of the input signal.

3. The encoding apparatus according to claim 1, further comprising a gain information generation section that calculates gain information that adjusts per-subband energy after the filtering.

4. The encoding apparatus according to claim 1, wherein the band enhancement parameter includes at least one of a pitch coefficient and a filter coefficient.

16. The encoding apparatus according to claim 2, further comprising a gain information generation section that calculates gain information that adjusts per-subband energy after the filtering.

17. The encoding apparatus according to claim 2, wherein the band enhancement parameter includes at least one of a pitch coefficient and a filter coefficient.

18. The encoding apparatus according to claim 3, wherein the band enhancement parameter includes at least one of a pitch coefficient and a filter coefficient.

5. A decoding apparatus that uses a scalable codec with an r-layer configuration (where r is an integer of 2 or more), the decoding apparatus comprising:

a receiving section that receives a band enhancement parameter calculated using an m'"'"'th-layer decoded signal (where m is an integer less than or equal to r) in an encoding apparatus; and

a decoding section that generates a high-band component by using the band enhancement parameter on a low-band component of an n'"'"'th-layer decoded signal (where n is an integer less than or equal to r).

6. The decoding apparatus according to claim 5, wherein the decoding section generates a high-band component of a decoded signal of an n'"'"'th layer different from an m'"'"'th layer (where m≠

n) using the band enhancement parameter.

7. The decoding apparatus according to claim 5, wherein:

the receiving section further receives gain information transmitted from the encoding apparatus; and

the decoding section generates a high-band component of the n'"'"'th layer decoded signal using the gain information instead of the band enhancement parameter, or using the band enhancement parameter and the gain information.

12. The decoding apparatus according to claim 5, wherein the band enhancement parameter includes at least one of a pitch coefficient and a filter coefficient.

19. The decoding apparatus according to claim 6, wherein:

the receiving section further receives gain information transmitted from the encoding apparatus; and

the decoding section generates a high-band component of the n'"'"'th layer decoded signal using the gain information instead of the band enhancement parameter, or using the band enhancement parameter and the gain information.

20. The decoding apparatus according to claim 6, wherein the band enhancement parameter includes at least one of a pitch coefficient and a filter coefficient.

8. A decoding apparatus comprising:

a receiving section that receives, transmitted from an encoding apparatus, first encoded data in which is encoded part of a low band that is a band lower than a predetermined frequency within an input signal in the encoding apparatus, second encoded data in which is encoded a predetermined band part of a residue of a first decoded spectrum obtained by decoding the first encoded data and a spectrum of the input signal, and a band enhancement parameter for obtaining part of a high band that is a band higher than the predetermined frequency of the input signal acquired by filtering part of the low band of the first decoded spectrum or a first added spectrum resulting from adding together the first decoded spectrum and a second decoded spectrum obtained by decoding the second encoded data;

a first decoding section that decodes the first encoded data to generate a third decoded spectrum in the low band;

a second decoding section that decodes the second encoded data to generate a fourth decoded spectrum in the predetermined band part; and

a third decoding section that decodes a band part not decoded by the first decoding section or the second decoding section by performing band enhancement of one or another of the third decoded spectrum, the fourth decoded spectrum, and a fifth decoded spectrum generated using both of these, using the band enhancement parameter.

9. The decoding apparatus according to claim 8, wherein the receiving section receives the first encoded data, the second encoded data, and the band enhancement parameter for obtaining part of a high band that is a band higher than the predetermined frequency of the input signal acquired by filtering part of the low band of the first added spectrum.

10. The decoding apparatus according to claim 8, wherein the third decoding section comprises:

an addition section that adds together the third decoded spectrum and the fourth decoded spectrum to generate a second added spectrum; and

a filtering section that performs the band enhancement by filtering the third decoded spectrum, the fourth decoded spectrum, or the second added spectrum as the fifth decoded spectrum, using the band enhancement parameter.

11. The decoding apparatus according to claim 8, wherein:

the receiving section further receives gain information transmitted from the encoding apparatus; and

the third decoding section decodes a band part not decoded by the first decoding section or the second decoding section by performing band enhancement of one or another of the third decoded spectrum, the fourth decoded spectrum, and a fifth decoded spectrum generated using both of these, using the gain information instead of the band enhancement parameter, or using the band enhancement parameter and the gain information.

13. An encoding method comprising:

a first encoding step of encoding part of a low band that is a band lower than a predetermined frequency within an input signal to generate first encoded data;

a decoding step of decoding the first encoded data to generate a first decoded signal;

a second encoding step of encoding a predetermined band part of a residual signal of the input signal and the first decoded signal to generate second encoded data; and

a filtering step of filtering part of the low band of the first decoded signal or a calculated signal calculated using the first decoded signal, to obtain a band enhancement parameter for obtaining part of a high band that is a band higher than the predetermined frequency of the input signal.

14. A decoding method that uses a scalable codec with an r-layer configuration (where r is an integer of 2 or more), the decoding method comprising:

a receiving step of receiving a band enhancement parameter calculated using an m'"'"'th-layer decoded signal (where m is an integer less than or equal to r) in an encoding apparatus; and

a decoding step of gene rating a high-band component by using the band enhancement parameter on a low-band component of an n'"'"'th-layer decoded signal (where n is an integer less than or equal to r).

15. A decoding method comprising:

a receiving step of receiving, transmitted from an encoding apparatus, first encoded data in which is encoded part of a low band that is a band lower than a predetermined frequency within an input signal in the encoding apparatus, second encoded data in which is encoded a predetermined band part of a residue of a first decoded spectrum obtained by decoding the first encoded data and a spectrum of the input signal, and a band enhancement parameter for obtaining part of a high band that is a band higher than the predetermined frequency of the input signal acquired by filtering part of the low band of the first decoded spectrum or a first added spectrum resulting from adding together the first decoded spectrum and a second decoded spectrum obtained by decoding the second encoded data;

a first decoding step of decoding the first encoded data to generate a third decoded spectrum in the low band;

a second decoding step of decoding the second encoded data to generate a fourth decoded spectrum in the predetermined band part; and

a third decoding step of decoding a band part not decoded by the first decoding step or the second decoding step by performing band enhancement of one or another of the third decoded spectrum, the fourth decoded spectrum, and a fifth decoded spectrum generated using both of these, using the band enhancement parameter.