SCALABLE ENCODING DEVICE AND SCALABLE ENCODING METHOD

• US 20090070107A1
• Filed: 03/15/2007
• Published: 03/12/2009
• Est. Priority Date: 03/17/2006
• Status: Active Grant

• Current Assignee: III Holdings 12, LLC (Intellectual Ventures LLC)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Yoshida, Koji, Kawashima, Takuya, Ehara, Hiroyuki
• Granted Patent: US 8,370,138 B2
• Time in Patent Office: Days
• US Class Current: 704/229
• CPC Class Codes: G10L 19/002 Dynamic bit allocation for perceptual audio coders G10L19/032
• CPC Class Codes: G10L 19/005 Correction of errors induced by the transmission channel, if related to the coding algorithm
• 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

Abstract

Provided is a scalable encoding device capable of improving quality of a decoded signal without increasing an encoding amount and compensating data with a sufficient quality upon data loss. In the scalable encoding device, an extension layer bit distribution calculation unit (103) calculates a bit distribution of a quality improving encoding data and compensation encoding data in the extension layer according to an audio mode of the input signal. An extension layer encoding unit (105) generates quality improving encoding data according to the specified number of bits. A compensation information encoding unit (104) extracts a part of core layer encoding data and makes it as compensation encoding data for the core layer. An extension layer encoded data generation unit (106) multiplexes the extension layer bit distribution information, the compensation encoding data, and the quality improving encoding data so as to obtain extension layer encoding data.

Claims

1. A scalable coding apparatus comprising:

a core layer coding section that generates core layer encoded data using an input speech signal; and

an enhancement layer coding section that, using the input signal, generates quality improving encoded data that improves quality of a decoded signal when decoded with the core layer encoded data, and encoded data for concealment, which is used for repairing data when the core layer encoded data is lost.

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

a deciding section that decides a speech mode of the input speech signal; and

a bit distributing section that performs bit allocation for the quality improving encoded data and the encoded data for concealment.

3. The scalable coding apparatus according to claim 1, further comprising:

a calculating section that calculates an coding error of a decoded signal decoded with the quality improving encoded data; and

a bit distributing section that distributes bits for the quality improving encoded data and the encoded data for concealment based on a degree of the calculated coding error.

4. The scalable coding apparatus according to claim 1, further comprising:

a calculating section that calculates a repairing error of data repaired by the encoded data for concealment; and

a bit distributing section that distributes bits for the quality improving encoded data and the encoded data for concealment based on a degree of the calculated repairing error.

5. The scalable coding apparatus according to claim 1, wherein the enhancement layer coding section sets a target frame for the encoded data for concealment with an earlier frame than a target frame of the core layer encoded data.

6. The scalable coding apparatus according to claim 1, wherein the enhancement layer coding section sets the encoded data for concealment with higher enhancement layer encoded data.

7. The scalable coding apparatus according to claim 1, wherein the enhancement layer coding section sets the encoded data for concealment with enhancement layer encoded data in a plurality of layers.

8. The scalable coding apparatus according to claim 7, wherein the enhancement layer coding section sets more important encoded data for concealment with low enhancement layer encoded data.

9. A communication terminal apparatus comprising the scalable coding apparatus according to claim 1.

10. A base station apparatus comprising the scalable coding apparatus according to claim 1.

11. A scalable coding method comprising the steps of:

generating core layer encoded data using an input signal; and

using the input signal and generating quality improving encoded data that improves quality of a decoded signal when decoded with the core layer encoded data, and encoded data for concealment, which is used for repairing data when the core layer encoded data is lost.