Adaptive Filter | ADPCM | ADSP | ADSP-2181 | Aliasing | AMR | Anti-Aliasing | ARMA | Autocorrelation | AutoCovariance | Beamforming | Bessel | Blackfin | Butterworth | C6713 | CCS | Chebyshev | CIC Filter | Circular Convolution | Code Composer Studio | Comb Filter | Compression | Convolution | Cross Correlation | DCT | Decimation | Deconvolution | Demodulation | DM642 | DSP Boards | DSP/BIOS | DTMF | Echo Cancellation | Equalization | Equalizer | ETSI | EZLITE (Ez-kit Lite) | FFT | FFTW | FIR Filter | Fixed Point | FSK | G.711 | G.723 | G.729 | Gaussian Noise | Goertzel | GPIO | Hilbert Transform | IFFT | IIR Filter | Interpolation | Invariance | JTAG | Kalman | Laplace Transform | Levinson | LPC | McBSP | MIPS | Modulation | MPEG | Multirate | Notch Filter | Nyquist | OFDM | Oversampling | Pink Noise | Pitch | PLL | Polyphase | QAM | QDMA | Quantization | Quantizer | Radar | Random Noise | Reed Solomon | Remez | Resampling | RTDX | Sampling | Sharc | TI C6711 | Undersampling | Viterbi | Wavelets | White Noise | Wiener Filter | Windowing | XDS510PP | Z Transform

VAD implementation in G.723.1?

Hi, I wanted to know how Voice Activity Detection (VAD) is handled in G.723.1 speech codec. How silence is detected and what parameters are passed to the decoder? Also what the decoder does in this case? I appreciate any help on this. hitesh_dj ...

.wav-> G.723

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 signal from linear or A-law or U-l...

Audio codec for G.729/G.723.1/G.726/G.728

I found a website(http://www.imtelephone.com) that provide audio codec(G.729, G.723.1,G.726,G.728). It has a very simple interface and you can easily intergrate into your software. . ...

Re: Type fixed piont

No limitation. You can declare the types depending on the your hardware platform. If you want to see any good example code, You can search any fixed point vocoder such as EVRC, G.723.1. ...

Re: Vector Quantization: Problem with designing codebook

> Keep trying :) > Take a look at the way the LSFs are quantized in G.723.1, G.729 or any > other standard codecs. > Hi Vladimir Thanks for the answer....I am re-inventing the wheel so I can learn :o) Can I download G723 and G729 for free somewhere or do I have to pay for it ? ...

Need some information on Voice codecs

Hello people Can any one tell me where I can buy G.723 and G.729 voice codecs? What would be the approx cost of those? Please give the links. Requirement is urgent. One more query Asumming that, one has a complete understanding of the CODEC, what could be the like...

audio transcoding

Hi all, I was wondering if anyone can give me some information (links, forums, possible books) on audio transcoding topic. I've been assigned this task and I need a starting point. I'm generally interested in audio transcoding but more specific in G.729.A or G.729.AB to G.723.1A transcoding....

Re: ITU recommendations, V-series, Naming

This is a multi-part message in MIME format. --------------000509000800030802010207 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Allan Herriman wrote: > On 23 Sep 2004 06:23:41 -0700, momo_1234562000@yahoo.com.au (momo) > wrote: > > > >...

Need info on speech CODECS

Hi, I work for a Multimedia startup company. we are luking for speech codecs implemented on ARM9 platform for our end system.Can any one give some info abt good companies who does Porting of speech codecs. we need ITU G.723.1 or 3gpp AMR-NB and G.726, G.711. Also cud any tell me how much ...

AMR- WB & AMR- NB

Hi to all, I am doing projects of AMR- WB(ITU G.722.2) & AMR- NB implementation on ARM9E. I have the following doubts, please clarify. 1) What are the standards for AMR- NB? Is 3gpp AMR-NB same as ITU G.723.1 ? 2) AMR- WB and GSM-AMR are same or not ? 2) What is the difference b...

Re: CS-ACELP - G.729 Recomendation - Please Help

Uderman wrote: > So, if anyone can point me at the right direction on the best way to > fully understand the operation of this codec, or have any kind of > resource especifically about the G.729 codec, please help me. The principle of the operation of G.729 is identical to many other ...

Re: G729

hurry wrote: > I am interested in implementing a voice activity detector (VAD). I have > G729 code, to test its VAD performance, with me but not the document to > understand the method. The VADs used in GSM 6.10, G.723.1, G.729 and many other vocoder algorithms are nearly identical....

Re: What's difference between Active NC and Adaptive NC

Saraah wrote: > > And could anyone give me some suggestions on choosing algorithm > dealing with the 'stationary' noises whose amplitude and pitch change > slowly compared to the spectral variations characteristic of human > speech? > > Thanks, > Saraah Take a look at VAD al...

Re: Please Recommend Book on Audio/Speech

The modem speech coding is based on the LPC algorithm in the time domain , multiband algorthim in the frequency domain. LPC based speech codecs are EVRC, QCELP13, AMR series, and ITU-T G.723.1, G.729 series. multiband speech codec are IMBE, and AMBE. The audio coding is based on FFT, MDCT bas...

warped filtering!

Hi, I'm reading about warped filtering using a chain of all-pass filters in "Frequency Warped Signal Processing for Audio Applications" by Aki Härmä et al. and have some questions that I hope you can help me with. I think I have grasped the idea of using an all-pass chain to warp the freque...

Re: Automatic voice codecs quality checker - partners search

On Jan 10, 1:21=A0am, vallu wrote: > Hello, > > We are searching for partners to promote and distribute our product > that > allows comparing vocoders' quality automatically. > > We believe that our solution gives added value to other products as it > is not the so-called QoE and ...

Beating TI at its own game

Hi, Everyone Let's guest how AudioCodec makes it. Jogging November 29, 2008 Beating TI at its own game By Kenton Williston Let's suppose you want to run VoIP on a TI DSP, but the processor isn't fast enough. What do you do? Sure, you could design your own DSP, but then you'd have...

Re: Visual "clipping"?

Jerry Avins wrote: > > Michael A. Terrell wrote: > > Martin Heffels wrote: > > > On Tue, 04 Sep 2007 17:06:52 -0500, Richard Owlett > > > wrote: > > > > > > > I challenged *YOU* to defend whacko claim!!! > > > Funny how every thread started by Radium, quickly turns into a s...

Re: Quantized FIR Coefficients and MSE Optimization

Jim Beasley wrote: > > I have an MSE algorithm that optimizes using a closed-form solution > (based on estimates of the statistics). > > However my filter coefficients are quantized. I am sure I can get > further improvement if I can tweak them. Brute force is out because > the n...

Urgent openings for DSP(1-2 yrs exp) ONLY FOR (1-2yrs exp)

We are looking for Very talented DSP engineers! Anveshan Telecom Recruitment Openings Discover the new wave in communication: Anveshan Telecom is a total telecom solution initiative from a group of renowned Indian strategists who are the path breakers in the global telecommunication and i...

Urgent openings for DSP(1-2 yrs exp) ONLY FOR (1-2yrs exp)

We are looking for Very talented DSP engineers! Anveshan Telecom Recruitment Openings Discover the new wave in communication: Anveshan Telecom is a total telecom solution initiative from a group of renowned Indian strategists who are the path breakers in the global telecommunication and i...

Re: Companies with VAD/VOX solutions?

Matt Roos wrote: > Hi, All. I need to find out all I can about voice activity detection > (VAD) and companies that supply hardware or software implementations. > This could include C code for PCs or DSPs as will as hardware black > boxes with a mic/audio input and some sort of output switch...

Re: Doubts about G.191

On 12 mayo, 18:00, Vladimir Vassilevsky wrote: > jajo wrote: > > Hi, > > > I am going to implement a g.722 codec into a DSP. My first task has > > consisted of looking for information about it and I have just found in > > ITU-R an interesting file: G.191 "ITU-T Software Tool Libr...

Re: Frequency Inversion

bachbeethoven200 wrote: > I have an audial signal of sampling rate 8000Hz (16 bits per sample) so the > frequency band that i can use is below 4000Hz (8000/2). I would like to > have a frequency inversion of 300Hz to 3kHz that means (300Hz will go to > 3kHz and 3kHz will go to 300Hz an...

Re: Searching for fixed point g.728 sources

Steve Underwood wrote: > Phil Frisbie, Jr. wrote: > > > That depends on what you mean as 'free'. I am sure I have seen freely > > downloadable fixed point code, but you cannot actually use G.728 in a > > product without licensing it due to patented algorithms. > > Are you sure ab...

DSP contractor position in Sydney, AU

Hello to everybody, I apologize for getting off topic but it looks like this is the only place you can meet an experienced DSP engineer, the jobs forums are very generic and partially hopeless. I am deeply sorry. We have a position for DSP contractor (6 months to 1 year contract) in Sydn...

Re: compression speed

I am assuming you are going to run this on a Pentium PC. I remember using the (encoder/decoder) of floating-point reference implementation implimentation of G.729 on PC. It would take a less than 10% cpu on 400 MHz Pentium III for a single channel. Use the floating point implementations if you ...

Re: the difference between mobile signal and telephone signal

On Apr 25, 1:15=A0am, Vladimir Vassilevsky wrote: > ste...@coppice.org wrote: > > On Apr 24, 10:07 pm, Vladimir Vassilevsky > > wrote: > > > > AFAIR the improved voice quality was the strong argument for IS-95. > > > Their codec at 14.4kbit/s sounded indeed much better then IS-5...

Re: Frequency warping....

> IMHO, your filter is an all pass filter but still introduces delay > with "filter" command. To see this, check the out1 matrix. So in the > above loop, y1 is essentially the filtered delay version of previous > y1. Since your x1 has 1000 samples and out1 also 1000x1000, so the > delay sup...

Multiple openings for Telecom

Dear All Many of our esteemed MNC clients are looking out for Oracle professionals with multiple positions opening. Please go through the list below and forward your updated word document CV if any of the profile matches your requirement. Please email your CVs to sandhya@amartyaplacements.com...

Multiple openings for Telecom

Dear All Many of our esteemed MNC clients are looking out for Oracle professionals with multiple positions opening. Please go through the list below and forward your updated word document CV if any of the profile matches your requirement. Please email your CVs to sandhya@amartyaplacements.com...

Re: Reverse Engineering 2-Pole Filter Coefficients

Michael.A.Alvarado@gmail.com wrote: > All, > > I was recently asked to attempt to reverse engineer a legacy filter for > my company developed many years ago with no documentation. This filter, > who function name is filterDataTwoPole (), was used to filter incoming > noisy navigation sp...

Re: Wavforms and principle component analysis

I know that this is supper annoying but I have no other idea of how to share some examples. Wave1 Wave2 Wave3 Wave4 Wave5 Wave6 Wave7 1259 1267 949 1324 1154 1245 1191 736 666 0 736 1429 638 281 0 69 649 76 69 62 0 767 783 36 833 467 763 558 0 0 213 0 380 3 111 425 454 510 467 0 427 154 ...

comp.dsp FAQ [2 of 4]

Archive-name: dsp-faq/part2 Last-modified: Wed Apr 11 2007 URL: http://www.bdti.com/faq/ Previous section (1) Next section (3) Q2: Algorithms and standards Q2.1: Where can I get public domain algorithms for general-purpose DSP? Updated ...

comp.dsp FAQ [2 of 4]

Archive-name: dsp-faq/part2 Last-modified: Mon May 8 2006 URL: http://www.bdti.com/faq/ Previous section (1) Next section (3) Q2: Algorithms and standards Q2.1: Where can I get public domain algorithms for general-purpose DSP? Updated ...

comp.dsp FAQ [2 of 4]

Archive-name: dsp-faq/part2 Last-modified: Wed May 3 2006 URL: http://www.bdti.com/faq/ Previous section (1) Next section (3) Q2: Algorithms and standards Q2.1: Where can I get public domain algorithms for general-purpose DSP? Updated ...

comp.dsp FAQ [2 of 4]

Archive-name: dsp-faq/part2 Last-modified: Thu May 4 2006 URL: http://www.bdti.com/faq/ Previous section (1) Next section (3) Q2: Algorithms and standards Q2.1: Where can I get public domain algorithms for general-purpose DSP? Updated ...

comp.dsp FAQ [2 of 4]

Archive-name: dsp-faq/part2 Last-modified: Tue Oct 19 2004 URL: http://www.bdti.com/faq/ Previous section (1) Next section (3) Q2: Algorithms and standards Q2.1: Where can I get public domain algorithms for general-purpose DSP? Updated 1...

Re: IIR design and stability

On Sun, 04 Jan 2004 05:40:32 +0000, Martin Eisenberg wrote: > > Thanks for reading ! I would like to design a 1st order digital > > high pass filter with a 50 us time constant. The analog transfer > > function is Ha(s)=50E-6*s/(1+50E-6*s). > > > Assuming that by "pre-warped pulsation"...