Algebraic codebook system and method

• US 6,847,929 B2
• Filed: 10/03/2001
• Issued: 01/25/2005
• Est. Priority Date: 10/12/2000
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Bernard, Alexis P.
• Primary Examiner(s): Young, W. R.
• Assistant Examiner(s): Brant, Dmitry
• Application Number:
  US09/970,317
• Publication Number:
  US 20020111799A1
• Time in Patent Office: 1,210 Days
• Field of Search: 704/219, 704/220, 704/222, 704/223, 704/262, 341/451
• US Class Current: 704/223
• CPC Class Codes: G10L 19/10 the excitation function being a multipulse excitation
• CPC Class Codes: G10L 2019/0008 Algebraic codebooks

Abstract

Code-excited linear prediction speech encoders/decoders with excitation including an algebraic codebook contribution encoded with a single sign bit for each track of pulses by inferring pulse amplitude signs from the pulse position code ordering within a codeword.

Claims

1. A method of algebraic codebook vector encoding, comprising:

(a) finding a pivot pulse position in a track of positions of a algebraic codebook vector, said track having three or more pulses which may have coincident positions; and

(b) ordering pulse position codes for pulse positions in said track with respect to a pulse position code for said pivot pulse position to encode pulse amplitude signs of pulses associated with said pulse positions.

2. The method of claim 1, wherein:

(a) the number of unit amplitude pulses in said track equals three, wherein when two or three pulses have the same position, their amplitudes add.