reading the MELP bitstream

Started by eric...@yahoo.com in Speech Coding11 years ago 3 replies

Good day! I'm supposed to do some experiments on this particular wideband speech coder that we're developing at our laboratory. I'm supposed...

Good day! I'm supposed to do some experiments on this particular wideband speech coder that we're developing at our laboratory. I'm supposed to verify this certain paper dealing with the exploitation of residual redundancies of a particular source coder's bitstream. I'd like to verify the paper first by using it on standard MELP and comparing my results with the results on the paper. However...


G.722.1 Matlab Implementation.

Started by srir...@gmail.com in Speech Coding11 years ago

Hi all, I am trying to implement the G.722.1 codec and the extension G.722.1 Annexe C on MATLAB. To do so, I am using the following...

Hi all, I am trying to implement the G.722.1 codec and the extension G.722.1 Annexe C on MATLAB. To do so, I am using the following paper: "From ITU-T G.722.1 to ITU-T G.722.1 Annex C: A New Low-Complexity 14kHz Bandwidth Audio Coding Standard" by Minjie Xie, David Lindbergh and Peter Chu. The questions I have are in the process of categorisation: 1. In the relation Nb = total bits per f...


Ask for the peper: "The Government Standard Linear Predictive Coding Algorithm: LPC-10".

Started by in Speech Coding11 years ago

Hi, all: Does someone of this group have this paper: "The Government Standard Linear Predictive Coding Algorithm: LPC-10". Thomas E....

Hi, all: Does someone of this group have this paper: "The Government Standard Linear Predictive Coding Algorithm: LPC-10". Thomas E. Tremain. Speech Technology Magazine, April 1982, p. 40-49 ? I am reading some papers on Linear Prediction Coding of speech signal these days. I think the FS-1015 (LPC-10) is quite suitable for me to understand the pricipal principle of LPC, but the L...


preemphasis filter, FIR, IIR

Started by phitenk in Speech Coding11 years ago 1 reply

hy all, 1. I want to ask, how to find the preemp coefficient 15/16=0.98..?? 2. why in LPC anlysis we using FIR & in LPC synthesis we use...

hy all, 1. I want to ask, how to find the preemp coefficient 15/16=0.98..?? 2. why in LPC anlysis we using FIR & in LPC synthesis we use IIR filter? what is the reason? thanks,,


Re: AMR-NB codec

Started by Ashwin Chandrasekaran in Speech Coding11 years ago

Thanks Dejun. By the way, so if I pack the actual encoded bits on a per fra= me basis and save it as a .amr file, then would any player that...

Thanks Dejun. By the way, so if I pack the actual encoded bits on a per fra= me basis and save it as a .amr file, then would any player that plays 3GPP = format audio files be able to play them? I plan to try this out anyway, but= just wanted to know if the file would be recognized as a 3GPP content or i= s there some other processing that is done on this before it can be recogni= zed and pl...


Re: AMR-NB codec

Started by Ashwin Chandrasekaran in Speech Coding11 years ago 2 replies

Hi Rama, Sorry about the confusion. I actually meant the file at the output of the AMR-NB encoder alone (not the decoded output) . Anyway,...

Hi Rama, Sorry about the confusion. I actually meant the file at the output of the AMR-NB encoder alone (not the decoded output) . Anyway, thanks for taking time to answer my questions. Cheers, Ashwin ----- Original Message ---- From: Rama Krishna K To: ashwin_c29 Cc: s...@yahoogroups.com Sent: Monday, August 4, 2008 11:24:44 PM Subject: Re: [spee


Recursive least squares and LPC

Started by kartikaye83 in Speech Coding11 years ago

Hi All, I have implemented a 10th order Recursive Least Squares filter on Matlab for speech and am comparing the weights thus obtained with...

Hi All, I have implemented a 10th order Recursive Least Squares filter on Matlab for speech and am comparing the weights thus obtained with the weights using the LPC function. Then I am comparing the speech quality using PESQ MOS values for various speech files. I run my RLS for lambda=1 (forgetting factor) and delta=.02 (regularization factor), which gives the best performance. ...


AMR light energy estimation

Started by nir....@gmail.com in Speech Coding11 years ago 1 reply

I am implementing a Jitter buffer for VOIP application. We use AMR as speech vocoder. I need to throw away some packets. I would like to...

I am implementing a Jitter buffer for VOIP application. We use AMR as speech vocoder. I need to throw away some packets. I would like to throw packetes that have low energy content. the vocoder code is not mine so I can't do the full decoding to find out the result enegry of the frame. Is there a gain decoded in the amr packet that I can get quick estimation of the frame energy? I lo...


LPC to LSF Source Code

Started by ray....@gmail.com in Speech Coding11 years ago 2 replies

Hello; I was wondering if anyone would be willing to share or direct me towards some Java or C code on how to convert from Linear Prediction...

Hello; I was wondering if anyone would be willing to share or direct me towards some Java or C code on how to convert from Linear Prediction Coefficients to Line Spectral Frequencies and vice versa. I am able to generate the LP coefficients using the Levinson algorithm, but am looking for some help to get to LS frequencies. Thanks. Regards, Ray


G729 details:

Started by "Deshpande,Vishvanath" in Speech Coding11 years ago 1 reply

Dear Experts, Can you let me know where do i find information=C2 about G729 speech codec = complexity, fixed point C implementation, memory &...

Dear Experts, Can you let me know where do i find information=C2 about G729 speech codec = complexity, fixed point C implementation, memory & MIps details (on=C2 ARM = or any dsp)?? Thanks, -Vishvanath PS: I've found some links in ITU-T, but i am looking for more accurate and = latest ones.


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