DSP

Downlink Scrambling Code Generator (for WCDMA/3GPP specific)
Hi, I was wondering if anyone has got the programming code (Matlab/C) for generating Scrambling Sequences for the Downlink configuration in a WCDMA (3GPP specific) system. All little that I know is that they are meant to be Gold Sequences, but beyond that I am having trouble comprehending the specs, so will appreci... 17 Oct 2005 06:44

whitening filter
Hi, I am trying to implement a high frequency regeneration system where I take a narrowband speech signal and reconstruct high frequecies to obtain a wideband signal. I have done LP analysis on the NB speech and have LPC's and the residue. I now want to pass the residue (after upsampling)through a whitening fi... 10 Oct 2005 09:45

Running TMS320C2812 McBSP as SPI
I am using McBSP with SPI compatible devices where DSP(TMS320C2812) can be SPI master or SPI slave. The TI website only has sample code for only McBSP and not McBSP as SPI. It also confirms that McBSP can be used as SPI. If anyone has such sample code (preferably both with and without FIFO) I would grateful if... 5 Oct 2005 02:35

Quadriphase barker sequences
Hello, I am looking for a quadriphase Barker sequence (a sequence whose elements are from the set {1,j,-1,-j} and which has a periodic autocorrelation function whose maximum sidelobe magnitude <= 1). In particular I am looking for a quadriphase Barker sequence of length 2^K (integer K). Any help appreciated. (I'... 29 Sep 2005 11:07

.act audio file format
Hi all, I'm looking for any information concerning the act audio file format used by some usb voice recorder. It seems to be adpcm but what is it wrapped in ? Thanks ... 28 Sep 2005 03:25

About DFT
With a little home-brew DFT program I am trying to some experiments. When I draw one period of a sine with amplitude 1 no DC componenent and analyse it with M #samples I get only 1 freq. component at Fs/M (n=1). I think this is correct. However the amplitude of the DTF component is on half of the sine's amplitude.... 4 Oct 2005 04:37

Adaptive Filter - LMS Algorithm
Hello, I am implementing the LMS Algorithm for acoustic echo canceller at a very basic level. In order to adapt the co-efficients of the filter using LMS algorithm, a desired signal is required. This would minimise the error between the output signal(with echo) and the desired signal. I would like to know what... 26 Sep 2005 15:39

Start designing with Microchip dsPIC controllers
Microchip controllers are very cheap, and the tools needed to start developing applications are the cheapest existing today! All you need is the ICD2 Programer/Debuger tool, about 200 USD, and a good tutorial book. The ICD2 is a tool which you can use for a very large range of Flash processors (possibly over 200), ... 23 Sep 2005 22:16

Removing White Noise
Hey everyone, I have an audio application, and I'm trying to do some pre/post processing to improve the sound quality. I put in an adaptive filter to try and remove structured noise, but I'd like to remove white/pink noise from the signal somehow.. I've been looking at wavelet techniques, or whatever else I can... 24 Sep 2005 06:24

Inverse windowing
Hi All, I am taking FFT of incoming signal and then windowing (convolving H(f) with the signal) it in frequency domain. After that I perform filtering of the signal. Now before taking the the IFFT, I want to do inverse windowing. What should be my H(f) for this? ... 27 Sep 2005 16:34