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Why do RTA DEQs use pink noise?

I'm working on a project for a DSP lab class and as you may have guessed from the topic, the project involves programming a real time analyzer DEQ. Perhaps I should have asked this in the planning/research stage, but why do RTA equalizers, such as the DEQ2496, flatten the frequency response of the ...

Code for generating 1/f^alpha pink noise

Hi, In a recent project I required a source of 1/f^(5/3) pink noise, but was unable to find any code or explanation on how to perform that. The DSP Generation of Pink Noise page[1] contains extensive information on generating 1/f pink noise, but has no mention of 1/f^alpha pink noise. I...

pink noise

How can identify pink noise statistically, as we identify that this signal is speech and this is noise, because using autocorrelation and harmonics analysis leads to pink noise identified as signal. ...

pink noise

Hi ALL I need an algorithm to generate pink noise (a drop of 20dB/decade) from white noise (use in simulink) that is suitable for a frequency range of 1 to 100 Hz. Any suggestion is appreciated. Regards Karl ...

pre-made bitstream, pink noise with only one RC filter?

Is there a way to generate a bit stream, and output it directly to a single stage simple RC filter, and the output be pink noise up to some cutoff, say 20khz? This would seem to be a very easy, cheap, simple way to make a pink noise generator. I assume you cant output the square-wave bitstream d...

Thresholds for white/pink noise ...

Hi, I took a signal processing module years ago but w/o useful labs :(. I am in the process to do some experimentations. Unfortunately, i don't have the practical knowledge to take some decisions. In particular, i am interested to know from what a threshold value i should consider a signal...

Re: is this pinking filter literal?

acannell@wwc.com wrote: > I'm trying to generate pink noise from a bunch of 8 bit random numbers, > and I came across this: > > b0 = 0.99765 * b0 + white * 0.0990460; > b1 = 0.96300 * b1 + white * 0.2965164; > b2 = 0.57000 * b2 + white * 1.0526913; > tmp = b0 + b1 + b2 + whi...

Filtering out pink & white noise

Hi, I'm trying to filter out heavy white and pink noise in a wav file to figure out the frequency of a repeating piano note. I'm kind of a noob. I'm working with Matlab and I'm just not to sure what kind of filter I should use... If anyone could give me any brief ideas I'd greatly apr...

Filtering out pink & white noise

Hi, I'm trying to filter out heavy white and pink noise in a wav file to figure out the frequency of a repeating piano note. I'm kind of a noob. I'm working with Matlab and I'm just not to sure what kind of filter I should use... If anyone could give me any brief ideas I'd greatly aprec...

Blue Noise creation via filtering?

Hello all, I trust I'm not intruding. I'm interested in creating "blue noise", as referred to in the following "Colors of Noise FAQ" posted in comp.dsp, and other sources: http://tinyurl.com/45h2k A quick synopsis: "blue noise" is so named because the power is concentrated at the high end...

Comfort Noise Generator

Dear Experts Well I've read a few previous posts on this aspect. The documents or references I used were: RTP Payload for Comfort Noise RFC3389. Appendix II of G.711 Annex B of G.729 Well my query is regarding implementation of a codec independent CNG: 1) Which excitation is best for ...

Generation of Pink Noise using 3dB/octave filters on digital white noise

Hi guys. I want to know how is it possible to generate digital white noise in a ADSP-BF561 board? I have tried searching for algorithms on digital white noise generation but i have been getting a lot of variations on the algorithms and the source codes. My intention is to generate digital whit...

Reasonablenes (NOT 'correctness') of using DCT in place of DFT

I've read ( 'have understood') that for real symmetric signals the DCT and DFT are equivalent. That got me thinking about a particular set of pseudo noise signals and how information is encoded. I'm interested in things loosely associated with speech recognition. Wouldn't be reasonable to...

Generating 1/f (flicker/pink) noise

Dear All After having spent a frustrating hour searching around to find some simple code that would generate 1/f noise, or more generally 1/f^alpha noise, I decided to write it myself. So here goes: http://www.eng.ox.ac.uk/samp/powernoise_soft.html I hope you enjoy it. Comments and feedba...

Re: Phase Noise and 1/f noise Generation

On 22 Sep., 18:22, robert bristow-johnson wrote: > On Sep 22, 12:21=A0pm, robert bristow-johnson > > > > > > wrote: > > On Sep 22, 9:32=A0am, Ikaro wrote: > > > > > 1) Where should I set frequency offset and phase noise value in the= code? > > > > Because I f...

Acoustic memory

I accidentally discovered something interesting, and thought I would share it here. Prepare a sound file with the following sequence of events. 1) Pink noise, 10 seconds 2) Filtered Pink noise with several notches in the frequency response (moderate Q's, frequencies in the 200Hz to 5KHz r...

Generating 1/f^2 and 1/f^3 noise

Hello, I am currently writing software to generate 1/f, 1/f^2 and 1/f^3 noise for use in a simulation, using an existing Gaussian PRNG. Currently, I am generating 1/f noise with the Voss-McCartney algorithm (from here: http://www.firstpr.com.au/dsp/pink-noise/), and it seems to work extre...

Interpreting noise

How do I know the difference between a signal which is decreasing in power as frequency increases because of its characteristic distribution (e.g., pink noise, brown noise), and a signal which is decreasing in power as frequency increases because it's band limited (e.g., white noise with a conti...

Re: The system that requires largest!

On 20 Dec 2003 15:39:58 -0800, santosh.nath@ntlworld.com (santosh nath) wrote: > Though it is not very good (rather stupid) to ask the following > questions; I thought this could be a pre-Xmas fun! > > 1. What is the largest FFT size(point) ever used so far and > where(Application)? Larg...

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...

Re: Questions about equivalents of audio/video and digital/analog.

"Eric Jacobsen" wrote in message news:kr21d3d6pvacviqdqgffk6e89l9bakv7m9@4ax.com... "Pearls before swine". However, I understand that the reason you do it is to keep people like Floyd from confusing the less-informed readers who will come along later. I have a rule that changes the...

Re: Acoustic room response - measurement and interpretation

What is a "wideband tone"? The standard ways are an impulse, swept sinusoids, and pink/white noise. I believe that pink noise is the most commonly used method. Once the data is in the PC, an FFT will give you the room's frequency response. A common method is to use a real-time spectrum an...

Re: how to design filter using slope

on 03/04/2005 00:14, career4krish@rediffmail.com at career4krish@rediffmail.com wrote: > I read your reply but wasnt able to post a follow up due to some problem in > site.----if u can, pls forward it as a follow up---- you can always use Google Groups to post, as long as your return addre...

Noise variance estimate

I'm trying to implement a simple denoising module based on wavelet filter-banks (DWT) with VAD. Noise is white, but I'm going to use other noises as well (car, babble, pink,..) 1) How can one estimate the noise variance on each subband? 2) Would it be better to build VAD on the base of decompo...

Does perfect white noise really exist?

A simple question: Based on the classical definition of "White Noise" (a random process which has zero autocorrelation, and a purely flat PSD from -INF to +INF), measurement of white noise to determine these properties (rxx, PSD, mean, variance, skewness and kurtosis) poses a paradox: When we...

OT? -- How far can linear supperposition be stretched

[ CAVEAT any term enclosed by "..." is used EXTREMELY loosely ] Given: 1. a non-periodic signal to be "characterized" [ "analyzed" implies much too much precision ;] 2. assumption that the data of interest is the relative "strength" of the signal in 3 to 5 non-overlapping f...

PCM audio processed by custom digital filter?

I'm trying to create a custom-spectrum noise sample, basically 1 second of white noise but filtered with a certain response. Its not quite pink or white, its got several peaks and valleys. I've been thinking about doing it like this: Step 1: Use a program like ScopeFIR to create a digital filt...

Spectral subtraction

We have data that is amplitude modulated on a specific frequency. The data/amplitude of the sin wave at 50Hz is slow varying in time. There is stationary background noise that is white to pink in nature. Our matlab simulation only shows improvement in SNR for a SNR value below about 15 and more n...

Question regarding the validity of a SNR calculation

Hello, I have a question regarding the computation of SNR. The case I am working on is a speech processing algorithm which suppresses background noise. The input signal is a noisy speech sequence defined as x[k]=s[k]+n[k] where s is clean speech and n is quasi-stationary pink noise. I wo...

Re: OT:Sampling in Stats

On Tue, 23 Sep 2008 19:23:06 -0700 (PDT), HardySpicer wrote: > When the Stats people sample data for analysis they have a load of > rules for population size etc. However, they never have to filter the > data first to avoid aliasing. Is this because the data is already in > "digital" forma...

Re: Deterioration SNR for cubic interpolation?

here: http://yehar.com/dsp/deip.pdf And don't worry about the pink elephant... ...

Re: DFT and bandpass filters

"Jerry Avins" wrote in message news:XPGdnbuCopx3MznfRVn-qw@rcn.net... > Jon Harris wrote: > > > The latest Windows Media player has several different "visualizations" that work > > kind of like this. With all the processing power available on the modern PC, > > they have a whole ...

Correct specification of spectra from measurements, difference PS and PSD

Hi all, I wrote this posting within another topic on this group already, but since there was no response it possibly just was in the wrong place, and also people might have stopped reading in the middle because it started another topic in an already existing discussion. I would like to ask it...

autocorrelogram have bias?

Hello I'm working on analyzing neuroscience data using the autocorrelation function. I discovered that it has a negative bias (for all lags except zero lag), that exactly matches up so that the sum of all is zero. This is in disagreement with what most textbooks write, for example this taken fro...

Speech Enhancement Application. Which DSP?

Hello everybody I hope I can get a little bit of help by posting this question. I am new to DSPs, but I would like to learn and I plan to buy a DSP Starter Kit, but I do not know which one is suitable for the application I plan to implement on the DSP.....so I hope there are some experts o...

Re: filter algorithms

> I have to implement three filters in C++. An IIR, FIR and > COMBINED(basically a sum of the two). I have been given the formulae and > its fairly simple (I think) but I know little about filters and would like > to be able to test them against something accurate (a good data set). Is > there s...

External noise generation with Matlab

Hi Do you if there is a toolbox or function to generate noise which is received after a RF transmission (a model of external noise with man-made noise, galactic noise, noise due to attenuation and noise due to lightning discharges)? Thank you ...

Distrubution of noise times noise

If I have two signals that are corrupted with Gaussian random noise and I multiply them, what is the noise distribution called? x1 = s+n1 x2 = s+n2 x1*x2 = s*s+(n1+n2)*s+n1*n2 Is noise times noise (n1*n2) the focus of any study? I would be interested to read about it. Thanks. ...

Another Eb/No Question

Does Eb/No, as used in digital communication calculations for signal to noise ratios, take into account the VCO/PLL/Reference phase noise of the carrier(s)? I ask because the phase noise is never really flat, and the Noise Power Spectral Density, or "No", is in Watts/Hz, which is assuming tha...

Relationship between noise dB level and sigma

I have a noise generator which gives me N(0, 1) Gaussian noise. I wish to add the noise to a signal of known dynamic range. What is the scaling such that the noise dB is 3. My approach was this: Since I need upto 3 dB, 3 = 10 log10(Vt/Vs)^2, which means Vt/Vs = 1.4142 where Vt is the noisy ...