speech compresion code

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murad

Joined: 08 Jun 2004
Posts: 7

08 Jun 2004 9:23 matlab error using levinson too many output

hi there
im new here i just want to say hi to u all.
im working on speech compresion using CELP code(code excited linear predictive coding). by MATLAB,
so plz if any one knows about this subject i will be thankful

dora

Joined: 11 Jun 2003
Posts: 158
Helped: 2

08 Jun 2004 15:58 matlab error levinson too many output

Hi murad,

You know that in the matlab6 lpc function was introduced ?
It uses classical Levinson-Durbin Recursion to estimate the prediction coeficients.

You can check the function to se how it works ... This algorithm is described in many books . If you need paper just let me know!

Regards
dora

satellite

Joined: 29 Mar 2004
Posts: 321
Helped: 7

08 Jun 2004 16:00 Re: speech compresion code

Speech Coding Algorithms Foundation and Evolution of Standardized Coders

http://www.edaboard.com/viewtopic.php?t=78092

mami_hacky

Joined: 28 Mar 2002
Posts: 724
Helped: 4
Location: Some where

16 Jun 2004 6:47 Re: speech compresion code

Dear friend,
this is my speech coder Very Happy

, 800 bits/s , off course not a good quality, but realizable.
this is mainly a modified version of LPC10E codec, I have downloaded it from some where in the internet, but I do not remember where.
then, I changed some parts, and I converted the 2400bps codec too a 800bps codec.
may be useful. run lpc10e, it will guide you through the rest.
thanks.

Sorry, but you need login in to view this attachment

padspcb

Joined: 28 Apr 2001
Posts: 297
Location: Earth

18 Jun 2004 9:45 Re: speech compresion code

Dear Friends
Basically codecs must meet some standards.
You need a codec? Ah, to minize space/traffic maybe.
Well, for traffic of audio/video/etc you should really
use RTP: A Transport Protocol for Real-Time Applications
All started long ago, so better start in 1996 by reading
RFC 1889
New info on RFC 3550 and RFC 3551

Now about codecs, you should better conform to the AMR convention
otherwise your app will not be worth the trouble.
I understand that the main issue is VoIP/Storage so AMR compression
modes can be found in RFC 3267.

Now, all source codes you need to encode/decode you find in the 3gpp site.

Best regards

PadsPCB

dsptwo

Joined: 21 May 2004
Posts: 9

29 Jun 2004 7:47 Re: speech compresion code

Hi kunal go ftp site of 3gpp there u will find gsm amr nb source code for free which is based on celp and latest one also and help u learning a lot.............

bobn

Joined: 11 Apr 2006
Posts: 6

11 Apr 2006 17:23 speech compresion code

thanks but what abt standards? all codecs must follow standards na

razwell

Joined: 02 Aug 2006
Posts: 10

04 Aug 2006 19:38 speech compresion code

can somebody give me the circuit for voice codec..
the coder circuit and the decoder circuit
plzz..i need everbody's help
thank you

leoren_tm

Joined: 19 Dec 2005
Posts: 649
Helped: 20

09 Aug 2006 6:43 Re: speech compresion code

Quote:

mami_hacky

was is that??
can you send me the papers for it pls????
im studying on speech coding and also on watermarking

ykianhin

Joined: 01 Aug 2006
Posts: 2

16 Aug 2006 6:05 Re: speech compresion code

Hi miami hacky, with regards to your 800bps LPC coder, what is the principle or theory that you used to reduce the bit rate from 2400bps to 800bps? Did you modify it based on any literature?

dchandresh

Joined: 28 Aug 2005
Posts: 94
Helped: 3

04 Sep 2006 10:54 Re: speech compresion code

hay bobn,

once the compression scheme is decided....then the standarization process will take place....sa i coded some audio with very good compresion ration then ...to use it we need to put an ABSTRACTION layer...that layer will control the codec and made it compatible to different communication medium.

for example, if u want MP3 codec for streamming..thenn u will have to use it with the RTP stack, now u need to configure ur codec to meet the constraints which are need in RTP.
same will be applicable for other aplication say playbck systems, satellite broadcasting etc
regards
chandresh

lastdance1983

Joined: 14 Sep 2006
Posts: 1

14 Sep 2006 2:44 speech compresion code

i am new here and currently working on the same project for lsp compression.
The problem now is which compressionway I should use.

leoren_tm

Joined: 19 Dec 2005
Posts: 649
Helped: 20

14 Sep 2006 2:53 Re: speech compresion code

lot of compresion suited for any type...audio, video..or something.....

pls specify

leoren_tm

Joined: 19 Dec 2005
Posts: 649
Helped: 20

09 Oct 2006 8:31 Re: speech compresion code

ajay9331 wrote:

hi..

hmm.....i think this is not the site to post that code...
you can just post ur code, not by attachment.....its beter that way...

Code:

1.Constructor Problem with NULL

NULL address can be access to output a data so in the specified program it won't crash.

class test
{
int a;
public:
void print()
{
cout<<"hi from empty"<<endl;
}
};

void main( )
{

test *a=NULL;
a->print();
}

But If we use the same program for Input a data such as
class test
{
int a;
public:
void getdata()
{
cout<<"Enter a data"<<endl;
cin>>a; //Application Will Crash Here Since it is trying to access 0x000000 (NULL)Address
}
};

void main( )
{

test *a=NULL;
a->getdata(); //Application Will Crash Here Since it is trying to access 0x000000 (NULL)Address

test *b=new test(); //This is OK
b->getdata();//This is OK

this is his code...

pranjal

Joined: 26 Feb 2007
Posts: 1

26 Feb 2007 10:08 Re: speech compresion code

hi this is pranjal agarwal. i m currently working on speech compression by polynomial aproximation but could not find any relavent material redarding it if any body know please help

jinal patel

Joined: 15 Feb 2007
Posts: 162
Helped: 2

24 May 2007 11:09 speech compresion code

hi satellite, the link given by you is removed. please arrange some other line

Google
AdSense
Google Adsense

24 May 2007 11:09 Ads

aarian04

Joined: 28 Sep 2007
Posts: 2

28 Sep 2007 21:41 Re: speech compresion code

Hi Friends,
I m doing thesis on speech compression by ADPCM. I've need help. If anybody have this types of code(Matlab Code) please help me.
Sender
Jalal

payate

Joined: 27 Sep 2007
Posts: 11

01 Oct 2007 5:27 speech compresion code

i need problem in speech recognition..how to train using neural network...and how to match..please anyone

spa_123

Joined: 11 Sep 2007
Posts: 10

04 Jan 2008 10:39 speech compresion code

Hi all,
am doing my project on VoIP application...so at first i need to design an audio codec...i really donno nething abt it...juz trying to read and understand.... i got the full matlab code for G.729A codec which uses ACELP algorithm..it has got hell lot of "m-files".... i cant understand anything..now i wanna know the flow of it...and how to club all these files....

can anyone help me in understanding ACELP algorithm step by step...help needed very urgently.... pleaseeeeeee

thank you.....

spa_123

Joined: 11 Sep 2007
Posts: 10

07 Jan 2008 10:55 speech compresion code

Hi Mami_hacky....

the code which gave for "lpc10e"...i went through it....but when i run the lpc10e.m ..am getting an error like this....

??? Error using ==> encode
Too many output arguments.

Error in ==> TRANS at 76
[ ipitv, irms, irc ] = encode( voice, pitch, rms, rc );

Error in ==> LPCEXEC at 119
[ voice, pitch, rms, rc ] = trans( voice, pitch, rms, rc );

Error in ==> INIT at 606
lpcexec

Error in ==> LPC10E at 76
init

do i need to change anything in the code....or is it the same?....its very urgent...will be waiting for ur reply....thank u.