Parameter decoding apparatus and parameter decoding method

• US 8,712,765 B2
• Filed: 05/17/2013
• Issued: 04/29/2014
• Est. Priority Date: 11/10/2006
• Status: Active Grant

• Current Assignee: III Holdings 12, LLC (Intellectual Ventures LLC)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Ehara, Hiroyuki
• Primary Examiner(s): COLUCCI, MICHAEL C
• Application Number:
  US13/896,399
• Publication Number:
  US 20130253922A1
• Time in Patent Office: 347 Days
• Field of Search: 704/201, 704/207, 704/223, 704/230, 704/220, 704/219, 704/208, 704/205, 375/240.08, 345/418
• US Class Current: 704/219
• CPC Class Codes: G10L 19/005 Correction of errors induced by the transmission channel, if related to the coding algorithm
• CPC Class Codes: G10L 19/04 using predictive techniques
• CPC Class Codes: G10L 19/07 Line spectrum pair [LSP] vocoders
• CPC Class Codes: G10L 19/12 the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders

Abstract

A parameter decoding apparatus includes a prediction residue decoder that finds a quantized prediction residue based on encoded information included in a current frame subject to decoding and a moving-average predictor produces a predicted parameter by multiplying a predictive coefficient with a past quantized prediction residue. An adder decodes a parameter by adding the quantized prediction residue and the predicted parameter, wherein the prediction residue decoder, when the current frame is erased, finds a current-frame quantized prediction residue from a weighted linear sum of a parameter decoded in the past and a future-frame quantized prediction residue.

Claims

1. A parameter decoding apparatus that includes a processor connected to a memory, the parameter decoding apparatus comprising:

a prediction residue decoder that finds a quantized prediction residue based on encoded information included in a current frame subject to decoding,

a moving-average predictor that produces a predicted parameter by multiplying a predictive coefficient with a past quantized prediction residue; and

an adder that decodes a parameter by adding said quantized prediction residue and said predicted parameter,

wherein said prediction residue decoder, when said current frame is erased, finds a current-frame quantized prediction residue from a weighted linear sum of a parameter decoded in the past and a future-frame quantized prediction residue.

2. A parameter decoding apparatus according to claim 1, wherein said prediction residue decoder, when said current frame is erased, finds a current-frame quantized prediction residue using the following equation;

3. A parameter decoding method comprising:

finding a quantized prediction residue based on encoding information included in a current frame subject to decoding,

producing a predicted parameter by multiplying a predictive coefficient with a past quantized prediction residue; and

decoding a parameter by adding said quantized prediction residue and said predicted parameter,

wherein, in the finding, when said current frame is erased, a current-frame quantized prediction residue is found from a weighted linear sum of a parameter decoded in the past and a future-frame quantized prediction residue, and

wherein at least one of the finding, the producing and the decoding is performed by a processor.

4. A parameter decoding method according to claim 3, wherein, in the finding, when said current frame is erased, a current-frame quantized prediction residue is found from the following equation;