Decoder

• US 20030055657A1
• Filed: 10/16/2002
• Published: 03/20/2003
• Est. Priority Date: 04/20/2000
• Status: Abandoned Application

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Inoue, Hajime, Miyazono, Shinya, Sawai, Masaharu, Yoshida, Masanao
• Application Number:
  US10/257,364
• Publication Number:
  US 20030055657A1
• Time in Patent Office: Days
• US Class Current: 704/500
• CPC Class Codes: G10L 19/00 Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis in musical instruments G10H
• CPC Class Codes: G11B 20/00007 Time or data compression or expansion audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression H04N19/00; data compression per se H03M7/30
• CPC Class Codes: H03M 7/30 Compression speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N; Expansion; Suppression of unnecessary data, e.g. redundancy reduction

Abstract

A plurality of decoding programs respectively corresponding to each of a plurality of compression formats is stored in a memory card 18 attached to a slot 16. A CPU 20 determines whether or not a decoding program corresponding to a compression format of music data to be reproduced exists in a RAM 22a, and transfers the decoding program from the memory card 18 to the RAM 22a according to the determination result. That is, when the decoding program corresponding to the compression format of the music data to be reproduced exists in the RAM 22a, the same decoding program is not transferred. The music data is decoded by a DSP 22 according to the decoding program stored in the RAM 22a.

Claims

1. A decoding apparatus for decoding an encoded signal encoded according to any one of a plurality of encoding formats, comprising:

an attachment means for attaching an external memory storing a plurality of decoding programs respectively corresponding to said plurality of encoding formats;

an internal memory for storing at least one of said plurality of decoding programs;

a determination means for determining whether or not a specific decoding program corresponding to the encoding format of said encoded signal exists in said internal memory;

a transfer means for transferring said specific decoding program from said external memory to said internal memory according to a determination result of said determination means; and

a decoding means for decoding said encoded signal according to the decoding program stored in said internal memory.

2. A decoding apparatus according to claim 1, wherein

said external memory stores a plurality of encoded signals complying with the same encoding format.

3. A decoding apparatus according to claim 2, wherein

a decoding program and an encoded signal corresponding with each other are stored in the same data file.

4. A decoding apparatus according to any one of claims 1 to 3, wherein

said encoded signal is a compressed music signal.