Encoding device, decoding device, and system thereof utilizing band expansion information

• US 20070239463A1
• Filed: 06/05/2007
• Published: 10/11/2007
• Est. Priority Date: 11/14/2001
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Shuji Miyasaka, Tomokazu Ishikawa, Yoshiaki Sawada
• Inventors: Ishikawa, Tomokazu, Miyasaka, Shuji, Sawada, Yoshiaki
• Granted Patent: US 8,311,841 B2
• Time in Patent Office: Days
• US Class Current: 704/500
• CPC Class Codes: G10L 19/18 Vocoders using multiple modes
• 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

A decoding device (30a) comprises a narrow-band decoding unit (31) operable to reproduce a PCM signal (P1) from a narrow-band bit stream included in a wide-band bit stream (S0), a wide-band decoding unit (32) operable to reproduce a PCM signal (P2) having a frequency band which is wider than that of the PCM signal (P1) reproduced by the narrow-band decoding unit (31) from the narrow-band bit stream and a band expanding bit stream included in the wide band bit stream (S0) and a selecting unit (34) operable to select either the PCM signal (P1) reproduced by the narrow-band decoding unit (31) or the PCM signal (P2) reproduced by the wide-band decoding unit (32), and to output the selected sound digital signal.

Claims

1-34. -34. (canceled)

35. A decoding method for decoding an encoded signal made up of a first bit stream which is an encoded sound digital signal and of a second bit stream which includes encoded band expansion information used for expanding a reproduction band of the sound digital signal, the decoding method comprising:

a separating step of separating the first bit stream and the second bit stream from the encoded signal; and

a first reproducing step of reproducing a first sound digital signal from the separated first bit stream,

wherein size information indicating a size of codes of the band expansion information is multiplexed into the second bit stream, and

wherein the second bit stream is separated in the separating step from the encoded signal according to the size information included in the second bit stream.

36. The decoding method of claim 35, further comprising

a second reproducing step of reproducing a second sound digital signal having a frequency band which is wider than that of the first sound digital signal reproduced at the first reproducing step from the separated first bit stream and the second bit stream.