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Verifying FFT Result   [20 Articles]

Hi Guys, I have computed FFT of 1 KHz sine wave with 1 Vp_p using C6713 DSK, to be sure that FFT algorithm is working fine, I want to verify my result. Can you please tell me ho...

c6400 2D FFT using dsplib   [9 Articles]

Can I do a 2D FFT using the TI dsp library fft routines (DSP_fft16x16t)? I can't find any examples for implementing this function even for the 1D case let alone the 2D case. It w...

DSP Processor for Real Time FFT Calculation   [11 Articles]

Hi, I want to build a real time FFT analyzer, my frequency range at the moment is 3Khz to 150KHz. I need to perform 2048-points FFT or even more. I am looking for a combinati...

FFT again, have a problem

Hi, c6x developers. I've founded the FFT function "cfftr2.asm". It contains both C and asm sourse, and asm is hand optimized. But TI's FFT operates by float ar...

optimum FFT size for C6711 cache system?   [3 Articles]

I was looking at the asm code on the TI website for the optimized FFT algorithms. Is there an optimum size for an FFT to best utilize the resouces on board the proc...

Real FFT/IFFT on C6711   [11 Articles]

Hi C6x, I have a project that requires a Real FFT/IFFT algorithm. I found several DSP libraries (DY4 and Kanegineering). But I hate to have to pay $5000 to $5500 ...

FFT algorithm

hi, i'm developing a jammer simulation model using C6201 fixed point processor. can anyone send me the FFT algorithm using C language. the inputs to the FF...

FFT function   [2 Articles]

Does anyone know where can I purchase a DSP library which has the function "autoscaling radix 4 FFT"?? Most of the site has only radix 4 FFT without autoscaling, so...

mixed radix FFT

suppose some one needed a 12 point fft. Does any one design the 12 point using a mixed radix fft or do most engineers use the published radix 4 and pad the sampled inpu...

using FFT DSPLIB functions for 64x   [3 Articles]

I intend to find 8 pt-FFT of floating point inputs. The FFT functions in the 64x library have input arguments of type SHORT. Do I have to modify the function in order to handle flo...

2d fft

Hi all, I'm attempting to do a 2d fft on image data (8bit chars - just luma for now) using the c6711 (idk). In the dsplib TI has several 1d fft algorithms that re...

FFT algorithm   [2 Articles]

i\'m a final year student from malaysia. Currently i\'m developing a simulation based application on Jammer Technology using C6201 DSP from TI. Can anyone send ...

FFT Implementation on DSP   [5 Articles]

Hi, does anyone has any idea how much time will a 512 point FFT typically take on 6701...the one I am using is taking approx 15ms..for a 256 point FFT it takes...

FFT. for dsp 64xx   [2 Articles]

I have a 144 point sequence I need to take a fft of. The radix 4 decimation of frequency/time takes up to many cycles. I was thinking of breaking the alg...

Computation of N-point FFT using N/2-point Real FFT algorithm.   [6 Articles]

Hi, I am using real FFT algorithm to compute N/2 points of FFT using N real inputs. This algorithm accepts only real input and gives cimplex output. I want to use same algorith...

How to split 2N-point real sequence after N-point complex FFT   [4 Articles]

Hi all, I'm using "cfftr2.asm" for 6711 routine to perform N-point complex FFT on 2N-point real sequence. It work's fine, I can perform FFT and IFFT (with "...

How to use TI's fft library???   [7 Articles]

Hi, Can anyone tell me how to use the DSP libraries from TI? I'm especially intrested in the fft functions. I tried the steps described in the SPRU657 gen...

Help for FFT point on C6713 platform   [2 Articles]

Dear All I am using c6713 dsk with CCS software. it's sampling frequency minimum 8KHz , max 99KHz & 256 FFT point. I want to process real signal 0.5Hz to 10 Hz. Is it possible to...

fft on c6x problem?   [2 Articles]

In fft radix4 code that given by TI, No overflow protection or detection is performed!! Therefore, as the numpoints N are increased, inverse fft do not make co...

FFT ON C6X   [2 Articles]

We have ordered the evaluation card of Texas. We have not find the optimized FFT routine which results gave the results of the FFT benchmarks reprted by Texas. Wher...

Real FFT   [2 Articles]

Hi group, I am developing a real time algorithm on my C6711 DSK and I have to deal with FFT's. I am using TI's function DSPF_sp_cfftr2_dit and it is working righ...

Double word aligned

Hi, I'm working with FFt function like DSPF_sp_cfftr2_dit(x,w,N) x:signal w:twiddle factor N:size of the FFT ----------------------------------...

DC after fixed-point FFT

Hello. When I get a spectrum(by FFT function from C64 library)after digital down conversion on my board(ADC(Analog Devices), DDC (Graychip GC4016), C6416), I always see a DC com...

Fixed point FFT

There was some disscussion here about the dynamic range of fixed point FFT. The simplest way around it is to scale down the data before the conversion, but has anyb...

void DSPF_sp_fftSPxSP- Simple Problem   [4 Articles]

Hi, I have one question which may sound stupid but I am really worried. I have implemented 'Efficient FFT Computation of Real Input' on C6713 DSK. In the code I have defin...

real value fft for c672x   [2 Articles]

Hi, Is there an optimized floating point FFT for real-valued 1D signal anywhere? I have some C code for the pre and post processing, but just have no time to optimize for the c...

C6701 FFT&IFFT libraries   [2 Articles]

Hello everybody again, I have been working with the libraries that Texas instruments supplies for the 6701 but the FFT and IFFT don't work properly in assembly. Th...

Twiddle factor table for radix 4 FFT in TI DSP library

Hi  I want to take a 65536 pt FFT and I need twiddle factors for that. The tw_r4fft routine only gives out for less than 32768 which i can get twiddle factors for 16384 pts only....

6711 DSK FFT with RF3 HELP!!   [2 Articles]

Hi all We need to do some real-time processing trials using the DSK 6711. I have got the RF3 reference, and the benchmark FFT. I am having major problems getti...

1Hz FFT   [4 Articles]

My requirement is to in the end deliver FFT's at 1Hz resolution. I have a functional system using the TI radix-4 assembly FFT and TI C6701. My sample rate is 7.6MHz...

Re: Re: FFT Frequency Range   [8 Articles]

Uawideo, I know about aliasing. If sampling frequency is 351.56 kHz, then the maximum frequency represented in FFT is FS/2, or 175.78 kHz. Does it mean that freq. resolution w...

DSP_fft in 6416

Hi, I try to find fft of impulse sequnce. But my fft output is not correct when i compare with matlab. Actually, fft of impulse should be one in all frequeny. My bug code given ...

fft of IIR filter?????????????   [2 Articles]

Hi all, how can i plot the fft of IIR filter's impulse response in ccs. Any response in this regard would be helpful. Thanks wajahat ...

1/N scaling factor for IFFT   [5 Articles]

Hi, I am using FFT algorithm for IFFT computation by changing sign of sine components of twiddle factors. I would like to know can I multiply FFT result by (1/N) before passing...

Question about the FFT on C6711   [3 Articles]

Question about the FFT on C6711 Hello everybody, I'm implementing a FFT on a TMS320C6711. The  code provided by TI (you can find it at ftp...

FFT-Radix2 implementation problem

I got source code of FFT (radix2) from site TI. I used 16 (or 32)-point FFT. When i set input values to (1 0 ; 1 0 ; ... 1 0), output values were (16 0 ; 0 0 ; .....

PING PONG for real time FFT Analyzer   [2 Articles]

Hi, I am working with C6713 DSK and ADS7881 converter. I am trying to make a FFT analyzer. My project is working fine at the moment but it is lacking with real time implemen...

q:large size fft ?   [11 Articles]

hi all: i need to do lager size fft(more than 64K);cause the dsplib do not surport it,i made the code myself(time is not critical).And test it with sine wave(which is generated by...

FFT of integer data   [6 Articles]

I'm working with code running on a 6713 processor, so it has hardware support for floating point numbers. I'm looking at possibly porting my algorithm to a different processor wi...

fft processor   [5 Articles]

Hello, I'm looking for a processor that can perform a 1024-point FFT on a 50ms time window in real-time. I need guidance on how to go about selecting a processor that will do th...