DECODING DEVICE, DECODING METHOD, ENCODING DEVICE, ENCODING METHOD, AND PROGRAM

• US 20140211948A1
• Filed: 06/24/2013
• Published: 07/31/2014
• Est. Priority Date: 07/02/2012
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Chinen, Toru, Hatanaka, Mitsuyuki
• Granted Patent: US 9,437,198 B2
• Time in Patent Office: Days
• US Class Current: 381/22
• CPC Class Codes: G10L 19/008 Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
• CPC Class Codes: G10L 19/167 Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes

Abstract

The present technique relates to a decoding device, a decoding method, an encoding device, an encoding method, and a program which can obtain a high-quality realistic sound.

The encoding device stores speaker arrangement information in a comment region in a PCE of an encoded bit stream and stores a synchronous word and identification information in the comment region such that other public comments and the speaker arrangement information stored in the comment region can be distinguished from each other. When an encoded bit stream is decoded, it is determined whether the speaker arrangement information is stored on the basis of the synchronous word and the identification information stored in the comment region. Audio data included in the encoded bit stream is output according to the arrangement of the speakers corresponding to the determination result. The present technique can be applied to an encoding device.

Claims

1. A decoding device comprising:

a decoding unit that decodes audio data of a plurality of channels included in an encoded bit stream;

a reading unit that reads downmix information indicating any one of a plurality of downmixing methods from the encoded bit stream; and

a downmix processing unit that downmixes the decoded audio data using the downmixing method indicated by the downmix information.

2. The decoding device according to claim 1,

wherein the reading unit further reads information indicating whether to use the audio data of a specific channel for downmixing from the encoded bit stream, and

the downmix processing unit downmixes the decoded audio data on the basis of the information and the downmix information.

3. The decoding device according to claim 2,

wherein the downmix processing unit downmixes the decoded audio data to the audio data of a predetermined number of channels and further downmixes the audio data of the predetermined number of channels on the basis of the downmix information.

4. The decoding device according to claim 3,

wherein the downmix processing unit adjusts a gain of the audio data which is obtained by downmixing to the predetermined number of channels and downmixing based on the downmix information, on the basis of a gain value which is calculated from a gain value for gain adjustment during the downmixing to the predetermined number of channels and a gain value for gain adjustment during the downmixing based on the downmix information.

5. A decoding method comprising:

a step of decoding audio data of a plurality of channels included in an encoded bit stream;

a step of reading downmix information indicating any one of a plurality of downmixing methods from the encoded bit stream; and

a step of downmixing the decoded audio data using the downmixing method indicated by the downmix information.

6. A program that causes a computer to perform a process comprising:

a step of decoding audio data of a plurality of channels included in an encoded bit stream;

a step of reading downmix information indicating any one of a plurality of downmixing methods from the encoded bit stream; and

a step of downmixing the decoded audio data using the downmixing method indicated by the downmix information.

7. An encoding device comprising:

an encoding unit that encodes audio data of a plurality of channels and downmix information indicating any one of a plurality of downmixing methods; and

a packing unit that stores the encoded audio data and the encoded downmix information in a predetermined region and generates an encoded bit stream.

8. The encoding device according to claim 7,

wherein the encoded bit stream further includes information indicating whether to use the audio data of a specific channel for downmixing, and

the audio data is downmixed on the basis of the information and the downmix information.

9. The encoding device according to claim 8,

wherein the downmix information is information for downmixing the audio data of a predetermined number of channels, and

the encoded bit stream further includes information for downmixing the decoded audio data to the audio data of the predetermined number of channels.

10. An encoding method comprising:

a step of encoding audio data of a plurality of channels and downmix information indicating any one of a plurality of downmixing methods; and

a step of storing the encoded audio data and the encoded downmix information in a predetermined region and generating an encoded bit stream.

11. A program that causes a computer to perform a process comprising:

a step of encoding audio data of a plurality of channels and downmix information indicating any one of a plurality of downmixing methods; and

a step of storing the encoded audio data and the encoded downmix information in a predetermined region and generating an encoded bit stream.