Depth first search in G729A speech coder | Speech Coding

Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)

Hi there, somebody please explain me about the depth first codebook search algorithm used in G729A (CS-ACELP). Also suggest some references (if any) to understand the logic behind the depth first search algorithm (specific to G729A codebook search). Thanks in advance Rao

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Hello, The basics behind fast search algorithms for algebraic codebooks have been explained in [1], and they apply well also to the depth first search. Some patents may also be a good starting point, see for instance [2]. Hope this helps, Vesa References [1] C. Laflamme, J-P. Adoul, H.Y. Su, and S. Morissette, "On reducing computational complexity of codebook search in CELP coder through the use of algebraic codes," IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 1990, pp. 177-180. [2] US Patent 5,701,392, "Depth-first algebraic-codebook search for fast coding of speech," Assignee Univ. of Sherbrooke, Canada, (J-P. Adoul, C. Laflamme), Dec. 23, 1997. ---------- From: Narasimha Rao B.V. [mailto:] Sent: Monday, March 13, 2000 00:35 To: Subject: [speechcoding] Depth first search in G729A speech coder Hi there, somebody please explain me about the depth first codebook search algorithm used in G729A (CS-ACELP). Also suggest some references (if any) to understand the logic behind the depth first search algorithm (specific to G729A codebook search). Thanks in advance Rao

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Discussion Groups | Speech Coding | Depth first search in G729A speech coder

Depth first search in G729A speech coder - Narasimha Rao B.V. - Mar 13 5:34:00 2000

Re: Depth first search in G729A speech coder - Vesa Ruoppila - Mar 13 16:54:00 2000