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Re: Division in Fixed Point

Yes, you're absolutely right about this, Tim. I chose to do it this way on my DM642 project since I don't yet know the architecture of this machine very well and, being a parallel machine it's a lot more difficult to pick up than, e.g., the TMS32054x. The routine is also invoked at a very low ra...

Re: Question on pole-zero cancellation

Tim Wescott wrote: > Jerry Avins wrote: > > > jim wrote: > > > > > > > Tim Wescott wrote: > > > > > > > > > > > > > In this case, what happens in practices is that the unit-circle section > > > > puts out a transient that will always integrate to the true DC > > > > value,...

scaling fixed point fft

Hello, I have constructed a 256 pt complex fft. My scaling is causing problems as the outputs from each stage are divided by 4 to avoid overflow. The input data and the twiddle factor coeffs are 16 bits wide (Q15). My problem is that when the data arrives at the last two butterfly stages of t...

Fixed Point Arithmetic resources

Hi, I'm looking for good links to information on Fixed Point Arithmetic. The only good resource I could find was - Fixed Point Arithmetic: An Introduction - by Randy Yates http://mel.interspace.dk/~sune/old-stuff/files/reading/fixed-point.pdf But, it is only an intro and does not deal w...

floating point v fixed point

My application is going to need a bit of fixed point, a bit of floating point calculations. Any advice as to whether a 720MHz fixed point processor (TI C64x) executing floating point libraries, can compete with a 225MHz floating point processor (TI C67x) ? Regards Nick ...

Fixed Point DSP Vs Floating Point DSP

Hi, I searched the internet to find out the difference between a fixed point & a floating point DSP. To my surprise, I did not find a well defined difference. Plz, can anyone differentiate between the two so that a layman can also understand ? Thanx in advance... ...

Blackfin FFT precision

The 32 bit data types of the Blackfin processors should preserve more bits of precision than a 16 bit fixed point processor, if the FFT routines make use of the 32 bit data types. Can anyone comment on whether this is the case, and how well the precision is maintained in the calculations? How ...

Re: Speech Recognition application

I think you must appreciate our own TTS/ASR engine, on www.sakrament.com Becose 2 weeks ago I have finished SR for SpeechBox device, processor TMS320VC5402 (fixed point). Sources are ANSY C 99%, dsplib-TI for logarithm only. There isn't big problem to release for ADSP Victor Khakhou ...

Re: phase from re and im with 2PI range?

On Thu, 17 Jul 2003 15:48:03 +0200, Andre wrote: > I am looking for a simple function to get an phase angle from real an > imag part preferable without dealing with atan and special cases. > I do not need to be too accurate (1% is OK) but I am tight in code space. Mr. Thomas already posted...

Re: which is best?

yong wrote: > I am starting to learn the DSP by using the Analog DSP. I am wondering > which one is "best" - I do not have target application now. just for > learning DSP. What I mean "best" is that the chip architecture is > current, stable, widely used, easy use(?), and the support for the...

Fixed Point issues

Hello, I am trying to implement an FIR and an IIR filter in fixed point arithmetic. The actual filter is of no importance(so I have implemented the simplest filter possible),as long as it is in fixed point,and moreover as I can give as input the desirable precision. I wrote the following piece...

Floating point to fixed point conversion.

Hi, I am Gowtham, i am doing project on DSP in speech compression, i have written a program in C and i need to implement this on a fixed point chip,so now i have to convert the floating point numbers into fixed point and then implement the fixed point operations on the chip, i would appreciate ...

HELP! IIR High Pass filter

Hi, I am trying to implement an IIR High pass filter to filter out a DC component introduced from a ADC convter we are using. I set the passband frq 200Hz, stopband freq 50Hz, Rp 0.2, and Rs -30dB. Using Matlab, I got the following coefficients for using 2 2nd order biquid filter. B0 ...

Fixed Point Resonant Lowpass Filter C code required

Hi everyone, I'm a relatively newbie to DSP and would like to add a resonant lowpass filter to a simple sound application. I have a floating point routine to do this but am wondering if this is possible in fixed point. I can't easily convert my existing floating point routine as this involv...

Re: Simple AGC (automatic gain control) algorithm

> The simplest I know is: > > if(signal too big)decrease gain, > else increase gain That's that I already know. Your algorithm is about to change gain too often, there should be some highmark and lowmark levels. The problem is to determine is the signal is big or small. > Can't offer ...

Re: Arctan approximation example

robert bristow-johnson wrote in message news: ... > In article b90ff073.0307301726.5b92dfe5@posting.google.com, Matt Boytim at > maboytim@yahoo.com wrote on 07/30/2003 21:26: > > > A hardware multiplier is mighty powerful so a technique that utilzes > > the multiplier, such as polyn...

Re: Combining G711 streams

Jerry Avins wrote in message news: ... > Vimal wrote: > > > > oen_br@yahoo.com.br (Luiz Carlos) wrote in message news: ... > > > Jerry Avins wrote in message news: > > > > > > > > Addition? How? > > > > > > > > Jerry > > > > > > If you linearize the G...

Re: IIR quantization

ahgu@yahoo.com (Andrew Xiang) writes: > In the matlab filter design filter box, when I click the Quantization > button after design a IIR, the freq response seems very different. I > cannot find the place where you can configure how many bits for the > system? > > Where do you specifi...

Re: books or manuals for TM320CXXX DSP programming in C?

Some more info: Mike Rosing wrote in message news: ... > yj wrote: > > Hi guys, > > I plan to learn programming TM320c DSP using C language. Is there any > > book or manual for that? > > Thanks > > Jeff > > > > Tons. check the TI web site for starters and pick a proce...

Problem with fixed point lowpass filter design

Hi Everyone, I'm a newcomer to DSP and am trying to write a Fixed Point implementation of the bilinear transform lowpass filter as outlined in the Audio EQ Cookbook (http://www.harmony-central.com/Computer/Programming/Audio-EQ-Cookbook.txt): y[n] = (b0/a0)*x[n] + (b1/a0)*x[n-1] + (b...

Re: PDF of an impulse function?

ntvdml@iafrica.com (Theo van der Merwe) wrote in message news: ... > mgodavarti@ditechcom.com (Mahesh Godavarti) wrote in message news: ... > > santosh.nath@ntlworld.com (santosh nath) wrote in message news: ... > > > > > > I am sorry to reject the second job-meaning the second stat...

Re: supplier for C26 DSK? Or alternative starter kit?

> I'd really like to get hold of the TI C26-based DSK (TMDS3200026), > because it is (was) cheap & looks pretty simple. But, no-one over here > (England) seems to stock them any more. The only supplier I've found > won't sell me less than 5! The DSP you mentioned is obsolete. I recommend y...

searching for a low power DSP, about 80 MIPS with flash and A/D's

Hello everyone, So I'm lookig for a DSP with the following characteristics : - about 80-100 MIPS - 16 bits fixed point operations - low-power for embedded application - on-chip flash (or EEPROM) - at least 8 12-bits A/D's As you see, my application doesn't require too much calculation pow...

Re: Finding acoustic resonance of a wine glass (using snack ?)

allnor@tele.ntnu.no (Rune Allnor) wrote in message news: ... > Jerry Avins wrote in message news: ... > > There is no force in that example. It's just a starting point. Extend > > the example ny imagining a railroad track running down the meridian, so > > the moving object has to rem...

Re: IIR filter design

robert bristow-johnson wrote: > > Erik de Castro Lopo wrote in message news: ... > ... > > I'm therefore asking people here the following questions: > > > > 0) How big and how "difficult" are the IIR filters you > > have designed? > > i have chained together mayb...

Re: floating point to fixed point conversion

"riya" wrote in message news:1140559978.072733.49460@o13g2000cwo.googlegroups.com... > hello guys, > > I need some help from you. I am doing a DSP project and for that I need > to do some C coding for the conversion of sample data which is in > floating point representation to fixed po...

Re: wondering if this works

Peter H wrote: > I have been looking a bit on this scrambling method and tried to write the > source code for it. > > http://www.mathworks.com/access/helpdesk/help/toolbox/commblks/ref/scrambler.shtml > > As I understand the input is a sample value and the numbers from 1 to M-1 > ind...

Re: Quadrature oscillator question

"Jon Harris" wrote in message news:3f660a93$1_4@newsfeed.slurp.net... > "Glen Herrmannsfeldt" wrote in message > news:h9v9b.464987$YN5.314538@sccrnsc01... > > > > "Jon Harris" wrote in message > > > > > 1. Have you seen this form of oscillator before? Does it go by any ...

Re: Fixed-point implementation of pow(0.5,x) and pow(x, 0.75)

"Anders Buvarp" wrote in message news:3F6F348E.F8214A04@lsil.com... > Hello Jim, > > Thanks for your reply. > > It is 0.5^x I need, maybe I can do a look-up table for now. Well, 0.5**x (Fortran notation), is just a right shift if x is an integer, and 0.5 is a fixed point number w...

Fixed point FFT

Hi, I have to implement the FFT for a vector long 2048 samples in a DSP which does not support floating point. Do you have any link to already written code that computes the FFT with integer computation? Thank you in advance ...

Re: Digital FM Demodulation - Filtering

Randy Yates wrote: > There can be good reasons to AGC even in a digital discriminator, e.g., if the > arctan() function is performed via a lookup table. CORDIC has problems for very small magnitudes as well. > Here's another example of a signal that is clearly bandlimited but > produc...

Fixed point FFT in C

I am looking for an efficient fixed point FFT in C. Does someone know an implementation on PIC18 (I know that PIC18 is not a DSP but this question is in the frame of a feasibility study with high constraints on costs) ? Thanks, EMe. ...

Re: gaussian white noise using only integer arithmetic

You might want to look at a technical report on the web: Generating Gaussian Pseudo-Random Deviates http://www.tsp.ece.mcgill.ca/MMSP/Documents/Reports/2000/KabalR2000c.pdf It examines the accuracy of the sum of 12 uniforms approach and suggests a new algorithm that should be easy to imple...

Re: fixed point - floating point newbie question

Hi, In a nutshell you divide the integer value of (e.g.) 8192 by 2^b, where b is the "scaling" of the fixed-point value. In your case, b must be 13 since 2^13 = 8192 and 8192/8192 = 1.0. In the second example, the scaling of the value is still apparently 13, since -16385/2^13 = -2.00012207,...

Fixed Point Library for Simulation?

Hi maybe I had the wrong keywords? I was gooling this group to find a fixed point class or library to simulate my target DSP arithmetic on a Windows Platform. Any hints? Alexander ...

Re: Can DSP be programmed to help with my hearing problem ?

Jim Frohoff wrote: > > I believe he means that the white noise only needs to be around the > > frequency he is trying to mask. > > > Precisely > > > > > So I believe the answer is that you need to filter the white noise > > source to > > > a tunable bandwidth. (Filtered ...

Re: Why fixed point ?

On Sat, 11 Mar 2006 18:00:44 +0100, Roman Rumian wrote: > Hello Friends, > > what is the advantage of using fixed point numbers in DSP calculations ? > Could anybody explain, why digital signal processors use it instead of > integers ? It's mostly a convenience, so that the most sig...

1.15 LMS problem ...please help

Hi friends, I am running an 1 tap complex tracker with an adaptive weight using a LMS algorithm. u-input d-ideal points y-filtered points w- coefficient y(i)=w*(i).u(i) e(i)=d(i)-y(i) w(i+1)=w(i)+mu.e(i).u(i) mu=0.01 The floating point algorithm works well with this value of ...

Re: RMS -> SPL

"Al Clark" a écrit > | To calculate the SPL (sound pressure level), you need to know the | sensitivity of the transducer (mic?) and the gain structure of the | soundcard. With a typical sound card this is sometimes more difficult | than you think. The easiest way is to measure the output...

KISS FFT version 0.2 now does mixed radix

FFT libraries don't need to be that complicated. http://sourceforge.net/projects/kissfft/ KISS FFT: A mixed-radix Fast Fourier Transform based up on the principle, "Keep It Simple, Stupid." There are many great fft libraries already around. Kiss FFT is not trying to be better than any...