ADPCM decoder required

Started by Sanjam in Speech Coding12 years ago 2 replies

Hi all. I am recording voice using ML2390 codec. It records speech in the ADPCM format. Now I wish to listen to the recorded data to validate...

Hi all. I am recording voice using ML2390 codec. It records speech in the ADPCM format. Now I wish to listen to the recorded data to validate whatever I have recorded. I need an ADPCM decoder for that. I tried out downloading numerous ADPCM players and decoders from the net but none proved to be useful. Can anyone come up with some solid solution for the same.? How can I use G.726 standar...


IMA ADPCM

Started by Raghavendra C V in Speech Coding12 years ago

Hello Experts, My new project requires me to work on IMA ADPCM codec. I did a bit googling but found a precious little. I have a few...

Hello Experts, My new project requires me to work on IMA ADPCM codec. I did a bit googling but found a precious little. I have a few questions. 1. I understand IMA no longer exists. So who is the licensing authority for IMA ADPCM? Is it microsoft? 2. Is the source code for IMA ADPCM codec freely available or should it be licensed from somebody? 3. What are the testing specifications f...


What is OKI ADPCM

Started by Mayank Kumar in Speech Coding16 years ago

Hi All, Does Somebody have any information about what is OKI ADPCM and how is it different from normal ADPCM. As well as...

Hi All, Does Somebody have any information about what is OKI ADPCM and how is it different from normal ADPCM. As well as any information about the source code availability for it. Regards Mayank


[ TONE Generation ] PCM - ADPCM

Started by Dhiraviam Natarajan in Speech Coding16 years ago

Hi ppl, I working on tone generation for an Access Network ( of a telephone exchange ). Can some one throw light on PCM to...

Hi ppl, I working on tone generation for an Access Network ( of a telephone exchange ). Can some one throw light on PCM to ADPCM conversion algorithm , point me some useful web tutorials / links. Can ADPCM samples be generated directly by any means ? Genera


[ PCM -ADPCM conversion & vice versa ]

Started by Dhiraviam Natarajan in Speech Coding15 years ago

Hi All, I'm abt to implement ADPCM decoding/encoding in ADSP 2191.With a minimum background in Communication Systems, I find it...

Hi All, I'm abt to implement ADPCM decoding/encoding in ADSP 2191.With a minimum background in Communication Systems, I find it difficult to understand the ADPCM encoding/decoding algo explained in ADSP Application Manuals. Can any one suggest/point me some good links t


ADPCM G.726

Started by Mahesh Subedar in Speech Coding18 years ago

Hello, I am implementing ADPCM G.726 standard. I have a doubt in that. what value of estimated output we have to take at the start...

Hello, I am implementing ADPCM G.726 standard. I have a doubt in that. what value of estimated output we have to take at the start of the compression.So, if anybody has the idea please let me know. Thanking you. Mahesh ______________________________________________


Number of ADPCM channels in E1 ??

Started by saha...@yahoo.com in Speech Coding14 years ago

Hi fellow Im new comer . could anyone please help me out . 1 . how many channels are transmitted if we have compressed the voice...

Hi fellow Im new comer . could anyone please help me out . 1 . how many channels are transmitted if we have compressed the voice channels in E1 with ADPCM with 40kbps, 32kbps, 24kbps, 16kbps bitrate. 2. Is their any specific frame structure like that for Pcm channels transmitted in E1 . 3. If possible please refer me some site or document.


.wav input to g.723

Started by learningdsp in Speech Coding15 years ago

Hello, I am a beginner and trying to understand the working of G.723 ADPCM. I have been able to get all the C files from ITU...

Hello, I am a beginner and trying to understand the working of G.723 ADPCM. I have been able to get all the C files from ITU for the G.723 ADPCM. I have a basic question. According to the documentation and block diagram the first block converts the input si


G.721vsG.729

Started by Prateek Shrivastava in Speech Coding16 years ago 1 reply

Hi guys, I am doing a project, comparing ADPCM & CELP. For this i have chosen G.721 for ADPCM & G.729 standard for CELP. In...

Hi guys, I am doing a project, comparing ADPCM & CELP. For this i have chosen G.721 for ADPCM & G.729 standard for CELP. In these, 1)What are the parameters that can be compared in these 2? 2)How can the Mean squared error be found out? 3)Are the MOS scores standa


ADPCM encoder/decoder

Started by vipul paladiya in Speech Coding17 years ago 1 reply

Hi champs, I am working on ADPCM encoder and decoder. I have got the C code of G.726 from the net. This is for all the...

Hi champs, I am working on ADPCM encoder and decoder. I have got the C code of G.726 from the net. This is for all the 16,24,32,40 kbps. I have purchased the standard document and testvectors from the ITU site. Now, I have the C code of encoder/decoder working on PC. I have te


ADPCM ITU C code

Started by Meenakshi Matai in Speech Coding15 years ago

Hello, I am working on implementing the G.726 ADPCM algorithm. In the C code obtained from ITU, there's a function called...

Hello, I am working on implementing the G.726 ADPCM algorithm. In the C code obtained from ITU, there's a function called "update". It is present in the "g72x.c" file. The first few lines of the function look like this: ylint = (short int)state


Identifying an ADPCM encoded file format

Started by braz...@easymail.hu in Speech Coding12 years ago 2 replies

I have just bought an voice recorder (Speed-Link PDR-3) but it contains just a windows converter to transform its own recorded voice files into...

I have just bought an voice recorder (Speed-Link PDR-3) but it contains just a windows converter to transform its own recorded voice files into wav/mp3 formats. I would like to use it in Linux and I'm ready to make an converter just I should know more about the file formats and the transformation algorithm it uses. In the windows dll I found just 2 interesting messages: - ADPCM Encode OK - un...


[speech codec help] search for IMA/DVI ADPCM 8:1 unstandard compressed format

Started by wang keven in Speech Coding14 years ago

Dear all: I am looking for the unstandard compressed format 8:1 of IMA/DVI ADPCM. I find it can be excuted in the software...

Dear all: I am looking for the unstandard compressed format 8:1 of IMA/DVI ADPCM. I find it can be excuted in the software cooledit. But I never see the arithmetic or source coding. I hope you will help me to find them. THX


MOS Score - G.726 ADPCM & G.729 CS-ACELP - Voice Quality issues?

Started by raju...@ngc.com in Speech Coding10 years ago

Hi DSP Related members, I am researching to find out information on the voice quality of codecs used for VoIP communication using networking...

Hi DSP Related members, I am researching to find out information on the voice quality of codecs used for VoIP communication using networking routers, switches and access devices. The main objective is that the MOS (Mean Opinion Score) should be greater than 3.82 on the scale of 1 (poor quality) and 5 (best quality). Is the Codec G.726 ADPCM (32 Kbps) with a MOS of 3.85 is used in the re...


IMA ADPCM

Started by dunjie17 in Speech Coding14 years ago 1 reply

hi, does anyone know how do they come up with the quantisation values in the table? rgds, tk ...

hi, does anyone know how do they come up with the quantisation values in the table? rgds, tk


Need help...

Started by Anonymous in Speech Coding18 years ago 1 reply

Hi all... Can anyone help me? I'm interested in ITU-T recommendation G.722.1(not SB-ADPCM) using MLT (Modulated Lapped...

Hi all... Can anyone help me? I'm interested in ITU-T recommendation G.722.1(not SB-ADPCM) using MLT (Modulated Lapped Transform)... But I can't find materials about it. (ex) algorithm description, source, etc. Bye... Have a good day...


speech coding at 11025 Hz

Started by sara_grassi in Speech Coding16 years ago

Hello, There exist public domain implementation of speech coders at 11025 Hz? (preferably ADPCM)? Thanks and best regards,...

Hello, There exist public domain implementation of speech coders at 11025 Hz? (preferably ADPCM)? Thanks and best regards, Sara


Regarding implementation!!!

Started by madhusudhan surya in Speech Coding17 years ago 1 reply

hi , Presently i am doing a project "Development of Generic Architecture for CELP algorithms" My questions??? ...

hi , Presently i am doing a project "Development of Generic Architecture for CELP algorithms" My questions??? ------------- why most of the speech coding algorithms are implemented in programmble DSP ??? i came to know that ADPCM harware impl


G726 on TMS320C62xx

Started by Anonymous in Speech Coding18 years ago 1 reply

Hello All: I am working on ADPCM G.726 Coder for dual channel. After completeing coding and testing sucessfully , MIPS(MCPS) ...

Hello All: I am working on ADPCM G.726 Coder for dual channel. After completeing coding and testing sucessfully , MIPS(MCPS) performance is found to be around 15( for full duplex). The assembly code is fully optimized as it's almost completely serial and without any soft


Re: Speech Coding Algorithm applied in 8-bit controller

Started by Anonymous in Speech Coding17 years ago

If you're targetting an 8 bit micro, I should stick to uLaw, A-Law and simple forms of ADPCM. They all code up well - but just...

If you're targetting an 8 bit micro, I should stick to uLaw, A-Law and simple forms of ADPCM. They all code up well - but just about everything else uses large quantities of 16 bit multiplications, making them impractical for 8 bit systems. I had a go at implementing lattice filters