DSP

Amplitude response of a Biquad Filter
I have a Guitar effects processor. It has an Equaliser ( five band Biquad filter) This equaliser accepts 5 coefficients I wish to plot a graph of the amplitude versus frequency of this cascaded filter. I am using Excel. Can anyone assist with the formula to generate frequency response of a Biquad filter. ... 23 Feb 2006 09:37

number 196 algorithm
Palindromic number is a number that reads the same backward or forward like 1991 ... Or if a number is not palindromic it can lead to a palindromic number after several iterations. For example, take 25, Reverse it that makes 52 and then add which will make 77 which is again palindromic. It is interesting to ... 29 Jan 2006 09:50

MELPe or MELP vocoder for secure portable device
For secure portable device that is based on 533MHz Power PC processor or Pentium, we would like to use low rate vocoder. We realized that MELP or MELPe vocoder may be best for rates between 600 and 2400 bps. Do we need DSP or can we use simpler and cheaper solution such as the Power PC/Pentium processor itsel... 25 Jan 2006 12:12

Deblocking filter for JPEG/digital video
G'day folks, I have come across a deblocking algorithm for JPEG (and similar) images that seems to do a pretty good job, but I have not been able to fully tell whether it stacks up well against the existing solutions. I was hoping a few of you folks might give me a general thumbs up or thumbs down before I inves... 3 Feb 2006 10:20

How to design/specify a window?
I am neophyte [ perhaps read ignorant ;] I've been told that a poorly chosen window can cause problems .} For my application the ratio of "maximumly flat" to transition region is 1000:1. What should I be considering? where should I be looking? Thanks [PS this group has made a start on teaching me to ... 22 Jan 2006 14:20

DTMF detection through Sound Card
Hi. I have posted two messages, but I can?t get this working. I mean, I'm getting the buffer from the sound card, and then I perform the goertzel algorithm with this, but the data I get is wrong almost all times. The steps are: Data: Buffer Size: 4096 Kb, N=4096, Sample Rate = 22050, Format: 16 bits 1) When ... 14 Jan 2006 16:00

Ways of implementing a Hilbert Transform
I want to implement a Hilbert transform, but i'd like to avoid having to deal with a kernel to convolute with, mainly because I wouldn't know how many taps I'd need and whether I should make a odd or even kernel, and also because this way it seems to give such an unperfect result. Since Hilbert Transform is basic... 23 Jan 2006 12:10

GMSK MODEM
Hi all I am currently working on my thesis simulating the GMSK modem. I first differentially encoded my bitstream and then separated the incoming bitstream into I and Q bits (serial to parallel).I then convolved both the I and Q bits with the gaussian filter (using gaussfir, BT = 0.5 and 0.3). I then MSK modulat... 9 Jan 2006 12:15

TI 320C6713
Hi Im currently trying to write a piece of code that will count unto 16(binary) on the 320C6713 dev board Could somebody please look at my (newbie) code and see if it will function correctly. Thank Tuurbo46 #include "dsk6713.h" #include "dsk6713_led.h" #include "dsk6713_dip.h" void main... 9 Jan 2006 09:38

Coherence of two EEG signals
I am interested in comparing segments of minute-long EEG records from two different brain regions. I want to determine the coherence of the two signals before an 'event' and after the 'event', with the hypothesis that the two signals would be more coherent in a given frequency range after the event than before it ... 15 Feb 2006 11:19