How to mix pcm sample?

Started by galip0986 in Speech Coding10 years ago 5 replies

Hello, I am implementing a voice conferencing program. I am using tms320vc5416 dsp.I have a distortion problem. I have A-law expanded(13...

Hello, I am implementing a voice conferencing program. I am using tms320vc5416 dsp.I have a distortion problem. I have A-law expanded(13 bit) pcm samples. These samples are stored as unsigned short in buffers. I convert this samples signed int and then I simply add these samples together. I abstract users own voice from the sum. At the and I scale the conclusion(shift right 2 bits). T...


RE: G729A : Bit-packing

Started by iajd...@provati.com in Speech Coding10 years ago

It is 10 bytes not 11 bytes right? g729 data is just a payload of a RTP packet. Nothing else required just wrap that up in your RTP packet and...

It is 10 bytes not 11 bytes right? g729 data is just a payload of a RTP packet. Nothing else required just wrap that up in your RTP packet and send.. > > > > > Hi Simha, > > IETF recommended Internet draft draft-ietf-avt-profile-new-12 - > RTP Profile for Audio and Video Conferences with Minimal Control > explains bit packing scheme for G.729 & other codecs. > I am not s


Wiener Filtering of speech simulation in Matlab

Started by fara...@yahoo.co.uk in Speech Coding10 years ago

I am working on a project of noise reduction for speech with Wiener Filtering. I am writing the code in Matlab. I have computed the PSD of noisy...

I am working on a project of noise reduction for speech with Wiener Filtering. I am writing the code in Matlab. I have computed the PSD of noisy signal and noise (Considering that the noise is the first few samples prom the noisy signal) and the Wiener Filter transfer function. The Filter characteristic however turns out like an all-pass filter, so the filtered signal resembles teh noisy signal to...


Re: wiener filter implementation.

Started by fara...@yahoo.co.uk in Speech Coding10 years ago

Hi, I am also working on a Wiener Filtering project. I have also encountered a few difficulties. I have followed the suggestions from this thread...

Hi, I am also working on a Wiener Filtering project. I have also encountered a few difficulties. I have followed the suggestions from this thread as well. My Wiener Filter appears as an all-pass filter, so there is no diffrence between the noisy signel and my output prom the Wiener Filter. Could you please give me some suggestions? Hi, > I am currently working on a speech enhancement project.


need help regarding bit stream file generated by G.723.1

Started by jayeshkumar makwana in Speech Coding10 years ago 1 reply

hi to all, =C2=20 I am currently working on G.723.1. I have ITU-T implementation of G.723.1. here G.723.1 encoder takes .tin as an input and...

hi to all, =C2=20 I am currently working on G.723.1. I have ITU-T implementation of G.723.1. here G.723.1 encoder takes .tin as an input and gives .rco as an output. it= means that .rco is a bit stream file. but I cant read that file properly b= ecause bit stream file should contain only two values representing 0 and 1.= .but here, this file contains varying values. =C2=20 anyone knows h...


AMR-NB codec :

Started by ashwin_c29 in Speech Coding10 years ago 2 replies

Hi All, Had a small doubt regarding the AMR codec. Why is the file size (file obtained at the output of an AMR-NB codec) constant for all...

Hi All, Had a small doubt regarding the AMR codec. Why is the file size (file obtained at the output of an AMR-NB codec) constant for all AMR rates even though there is a different bit allocation for each 20 ms speech frame of the input file corresponding to each of these rates.(Besides the file size is also larger than that of the input file). Am still a novice as regards this codec and...


SECURE SPEECH COMUNICATION

Started by vija...@gmail.com in Speech Coding10 years ago 1 reply

Hi This is vijaya bhaskar vasha ,i am doing my M.Tech project on secure speech communication on TMS320C6713 DSP microprocessor i.e. first i...

Hi This is vijaya bhaskar vasha ,i am doing my M.Tech project on secure speech communication on TMS320C6713 DSP microprocessor i.e. first i need to compress the speech signal and then encrypt it. compression algorithm i choose is CELP . But the problem is now that i am not getting the exact block diagram of the CELP. So if some has related material to this please send to me ...


Aysemetric Speech Encoding

Started by seandunlevy in Speech Coding11 years ago 1 reply

I'm looking into a low bit-rate speech compression route that I can decompress using an ARM7 TDMI running at 33MHz. There will be no real- time...

I'm looking into a low bit-rate speech compression route that I can decompress using an ARM7 TDMI running at 33MHz. There will be no real- time encoding required, so coding time (as long as it's not months) is not important. Virtually ALL encoders are designed around bidirectional sound whereas this is purely for playback. If anyone has any clues, I would be most grateful. Oh, I'm a ...


Some papers needed

Started by jamal_eee_03 in Speech Coding11 years ago

Is there any one who has the following papers? If u have,Please send to me.It will be very helpful for my work on "Speech Enhancement". 1. S. F....

Is there any one who has the following papers? If u have,Please send to me.It will be very helpful for my work on "Speech Enhancement". 1. S. F. Boll, "Improving linear prediction analysis of noisy speech by predictive noise cancellation," in hoc. IEEE Znt. Coni on Acoust., Speech, Signal Processing, Philadelphia, PA, Apr. 12-14, 2. S . F. Boll and D. Pulsipher, "Noise suppression methods f...


Identify low energy AMR frames

Started by nir elkayam in Speech Coding11 years ago 3 replies

hi, I am using AMR 4.75 and AMR 5.15 for Voip application over very small bandwidth line. I would like to identify low enery frame I order to...

hi, I am using AMR 4.75 and AMR 5.15 for Voip application over very small bandwidth line. I would like to identify low enery frame I order to Skip over them on transmition. I'am using black box encoder/decoder so I can't get to the raw voice. Is there any indication of frame enrgy? how, in general can energy be built? can I assume that the gain composed of the filter gain and the exc...


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