DSP

90 degree phase shift
Hi Guys Hope you guys can help. I'm just getting into DSP (indirectly really). I'm trying to create a quadraphonic SQ decoder in software. To do this I need to shift the enitre audio range through +90 or -90 degrees. I belive after a lot of reading and an immense amount of confusion I need a hilbert transform ... 17 Jul 2006 13:05

Rune vs Meteorite?
I saw this on the web today: http://www.aftenposten.no/english/local/article1346411.ece A meteorite struck northern Norway Wednesday. The article talks about seismographs picking it up, so I wonder if Rune has a take on all this. -- Jim Thomas Principal Applications Engineer Bittware, Inc jthoma... 16 Jun 2006 12:49

Daubechie-4 Wavelet
Hi, i view in an article on the Daubechie-4 Wavelet that the level 1 Wavelets have an support of 4 time units. With this statement i agree but further is written, that the level 2 wavelets have an support of 10 time units. But i hought it should have been 8. Can anybody explain why the support is ten time units? ... 1 Jun 2006 05:36

legality of forward declaration
Hi, Is the following code legal: ------> code starts here <------ #include <stddef.h> struct ForwardDeclared; void foo(struct ForwardDeclared[]); /* Dummy function, so this module contains some code. */ void dummy(void) { foo(NULL); } ------> code ends here <------ ? I can see no reason why this code... 1 Jun 2006 06:37

WMA VS MP3
Can anybody explain to me what is the difference between WMA and MP3 at the algorithm level.. Like One thing would be MP3 uses MDCT and WMA uses Modulate Lapped Transform(DCT IV) but the question is why? I believe MP3 does not have the run of zeros concept while doing Huffman decoding as compared to WMA. Does ... 27 May 2006 18:46

TalkThrough ADSP BF533
Hi, I'm programming an ADSP-BF533 EZ-KIT Board for audio signal processing. In main file of "Talkthrough" (by Analog Device) there's the following declaration: // array for registers to configure the ad1836 // names are defined in "Talkthrough.h" volatile short sCodec1836TxRegs[CODEC_1836_REGS_LENGTH] = { ... 30 May 2006 10:12

DTMF using MATLAB
Can any body help me in writing code of following problem in MATLAB :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::­:::::::::::::::::::::: Design digital oscillators for DTMF frequencies at sample rate of 22500 sp/sec Generate a seven digit DTMF using Digital Oscillators and write it... 24 May 2006 05:13

Feature extraction
Hi, Given a collection of audio files (raw streams) I would like to determine which of the songs has an acoustic guitar in it. Coming from speech and language processing I am aware of some strategies for feature extraction, but not enough to build something from scratch. Can anyone point me to simple resource... 21 May 2006 14:34

FM demodulation
i came to know that FM demodulation can be done through envelope detection. i have implemented the FM demodulation using envelope detection and i was unable to detect the original signal. i have not implemented the limiter circuit for this. i have passed the FM signal directly to the BPF followed by differentiator ... 16 May 2006 23:39

FFT windows
Does anybody know if the FTT window cos2n(t) have an official name. I call it the Moriat window because one of my frinds started a discussion abot this window. Jens Hee www.jenshee.dk ... 10 May 2006 17:07