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

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...

AMR Optimization

Hello all, I would like some (no, make that a lot of help) concerning AMR optimization. basically my situation is this. The carrier is GSM 850 and recently deployed AMR across a section of the network which was experiencing high blockage, high handover failure, high drop calls etc. I recently joi...

AMR - WB

Hi Dmitry, Thanks for your information. Can you tell me, What is the difference between ARM and TI- processors in the MIPS point of view ? Approximately how many days one guy will take to complete AMR - WB & AMR projects on ARM 9E,If he is having the fixed C-code ? Best Rega...

AMR codec implementations

Hi, I am looking at running the AMR 3GPP codec on an ARM9TDMI platform. This not strictly a DSP, but I've looked around and I haven't seen much about AMR except the ETSI reference codec so I thought I could ask here. My question is - has anybody seen a fixed-point 32-bit implementation of the...

AMR-Codec / Patent?

Hello! Does anyone know about a patent on the AMR codec? And if a patent exists - who is contact for licensing? On the ETSI IPR search there's only mentioned that "Ericsson claims to have some patents (pending) around AMR". The ANSI C code example from 3GPP (26.073) is completely without...

AMR WB+ (fixed point) Frame duration

Hi all, I am trying to port AMR WB+ (fixed point Base line) to some platform. I want to calculte MIPS consumption of the codec. I know, if it takes 'X' million instructions per frame on the processor and 'T' is the frame duration, then MIPS = X/T I have the value of X with me. Can an...

AMR-NB metadata / frame structure

Hi All! Can anybody provide me the metadata details of AMR-NB encoded frame please. ...

GSM AMR on blackfin.

I am working on a GSM AMR codec. I have optimized the codec for real time operation on a Blackfin DSP on the 533 evaluation board. I capture the input and play it out. I have put the system in two configurations: (a) No codec, plain loopback of the captured sound on the output speaker. I get g...

GSM AMR optimization

Hi, I am optimizing GSM AMR reference code. The optimization needs not to be bit-exact, in fact, some quality degradation is permitted. I have done all the obvious things like primitives inlining, autocorrelation approximation, etc. Are there any other mathematical shortcuts to make the codec...

Need info on GSM AMR frame size ....

Hi, I am evaluating some GSM AMR codec, I needed the following details as I am writing a wrapper for it. #define GSM_PCM_SAMPLES_PER_FRAME #define GSM_SAMPLES_PER_FRAME #define GSM_SAMPLES_PER_SECOND #define GSM_BYTES_PER_FRAME #define GSM_FRAMES_PER_SECOND I am new to codecs and e...

GSM AMR output

Greetings. The GSM AMR output has only 0xff81 and 0x007f only. Why is it not that one can compress the stream further that sends the number of ff81 and number of 7f in the encoder output stream. as in: ff81 ff81 007f 007f 007f 007f 007f 007f 007f can be: ff81 02 007f 07 ... or some other fla...

IEEE transaction list

Hi, I am working on VAD1/VAD2 algorithm and Fixed codebook search of 3GPP GSM AMR speech codec as a part of my educational project. I would be grateful to you all if you could send me IEEE transaction list (only the names) on VAD and Codebook search for AMR. Thanks and Regards, Anoop Deo...

LP analysis in AMR speech codec

Hi, In the transcoding document provided by 3GPP standard for AMR speech codec, in the section LP analysis it is mentioned that auto-corelation r(0) is multiplied by the white noise correction factor 1.0001 which is equivalent to adding a noise floor at -40dB. Could someone explain more a...

MIDI speed calculation

I am porting MIDI synthesizer(timidity) to DSP, I want to calculate the speed. As I know the market requirement speed of MIDI is 28 MCPS (Mega cycles per second). I don't know what is the frame size/length this calculation based on. MP3: frame length is 26 mili seconds, frame size of 44.1khz mp3 ...

Re: GSM 6.10 Freq Other than 8000

KWhat4 wrote: > I have been playing around with the GSM 6.10 codec and noticed that > the source code i found does not support anything except 8000, I was > under the impression that GSM supported up to 44100 but I am unable to > find any information for anything except 8000. > > The i...

ETSI basic operation: meaning of L_sub_c

I'm looking for an authoritative definition of the ETSI basic operation L_sub_c, specifically the sense of the Carry flag on input and output. I have the AMR codec reference C code, but L_sub_c is commented as subtracting input carry and then does the opposite (i.e. subtracts invertse of inpu...

Bit rate of a codec

Dear all, What does the bitrate of a codec quantify? In other words if say AMR codec supports a bitrate of 12.2 Kbps what does that numerical value mean? ...

regarding G.722.2

hi, Why we are giving 14-bit input to G.722.2(AMR-WB) instead of 16-bit. Will this code work for 16-bit. with regards, venugopal nadipalli ...

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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...

voice codecs (g.729 & AMR)

Hello everybody, The G.729 reference C implementation contains saturation arithmetic... My question is whether an implementation without saturation could still be conforming to the standard? If it would still be standard conformal, what would posible effects be? Also would a 48bit impleme...

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 ...

Re: Auto corelation

Dear Rune and Steve, Thanks a lot for replies. Steve, actually the autocorelation in AMR takes quite a few cycles, nearly 12% of the total cycles. The input sequence is 160 samples long and the corelation is to be found for lag ranging from 0 to about 140. For each lag value, we have to fetch...

Help~~ How it can spilt signal into 2 bands?

In 3gpp Ts 26.094, the famous GSM AMR specifications, VAD section, it says, Xlp(i) = 0.5*( A1(x(i-1)) + A2(x(i)) ) ; Xhp(i) = 0.5*(A1(x(i-1)) - A2(x(i)) ) ; where, A1 and A2 are first order direct form all-pass filters, whose transfer function is given by A(Z) = [C+Z^(-1)] / [1+C*Z^(-1...

Re: Voice Activity Detection (VAD)

Randy Yates wrote: > Steve Underwood writes: > > > They recently changed the VAD in G.729 to try to improve it. > > Where is G.729 used? VOIP? Mostly. The documentation implies it was originally designed for wireless applications, but VoIP is its main application in the real w...

Migrating to CCS 3.0

I've made the migration from CCS 2.21 to CCS 3.0. Code that used to compile fine is now giving me errors. Here is the error I am getting on all c files. "error: unrecognized cregister name 'FADCR'" "error: unrecognized cregister name 'FAUCR'" "error: unrecognized cregister name 'FMCR'" T...

Somewhat off-topic post: DTMF transfer with wireless codecs

I am researching the capability of various wireless speech codecs in handling DTMF digits. Since these codecs are typically rather low rate, one would expect that their ability to reliably transmit pure tones, music and/or multitone digits would be compromised. I see in the SMV codec specifica...

Re: How to convert MALE voice into FEMALE voice???

This is one of the greatest effects in vocoders. I remember doing it once to Amitabh Bacchan's Voice. Hope there are no fans around. Of Course there was a bug. I dare not do it intentionally :-) I guess using only a filter wouldn't be good enough. If you use a parameteric codec, which extracts...

complexity of a program in ARM 9E

Hi all, I have been working on AMR-WB,on ARM9E and i am using ADS 1.2 tools. Please clarity this doubt. 1. How to know the complexity of a program? I am using profiling method as given in AXD Deguggers Guide (pdf ...

Re: speech detection

doggie wrote: > Hi everyone, i have implemented my speech detection algorithm based on > energy detection,zero crossing and a few other parameters. Now i would > like to proceed further by using neural network and fuzzy logic.Anyone has > any ideas how should i proceed? For example, in image...

WMA decoder problem

Hi, I am integrating a WMA decoder into the TI OMAP.. the platform also includes other codecs..like mp3 and AMR.. The WMA decoder works fine when it's alone inside.. After integration, the situation is: 1. the correct data is fed to the decoder, but the decoded data is corrupt. But when i comp...

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...

Re: Acoustic echo cancellation

may be it will be more clear by a diagram. --far_end-------------------|ENC|-------|DEC|--------// | | speaker | \\ AEC | LEM with T_60...

Re: GSM WAV LOW FILESIZE QUESTION

"type" writes: > [...] > This is a compression forum so I cant see why this should be such a far > out question? It is a far-out question because the goal of source coding (which is what compression schemes like mp3, AMR, etc., are) is to produce an information signal i[n] from the sou...

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...

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Re: Why randomization is needed prior to FER ?

Randy Yates writes: > jia writes: > > > Hi, here > > > > I am confused about the usage of the Randomization prior to FEC. > > > > Usually, the transmit burst is randomized by being correlated with a > > pseudorandom binary sequence, before being fed into the FEC encoder > > ...

Re: the difference between mobile signal and telephone signal

> > > HyeeWang wrote: > > > 1. What is the difference between speech signal attained from mobile > > and that of telephone? > > 64kbit/s versus ~10kbit/s The 64k speech quality on the wired network is poor. At less than half that you can have pretty respectable wideband voice that ma...

Re: speech enhancement using Kalman-- help with segmentation

Hi, Just few answers: > 1). Why the stationary assumed frames being windowed > non-rectangularly before extracting AR parameters? > 2). Furtermore, the > segments are being overlapped! Why? This is because we want to estimate the PSD using the Welch periodogram method ... > 3). For c...

Re: question for purchasing DSP

bhooshaniyer wrote: > Steve-- > > > > The C6000s are very much cell phone DSPs, and are very successful > > there..... > > > They are not inside the cell phones.Period. > > AL mentioned that 70% of all DSP's go into cell phone, so thats were the > discussion started. So, t...