You can read about pink noise at: http://en.wikipedia.org/wiki/Colors_of_noise
While you could check with pro-audio commercial sources, I believe you can build one using a chain of binary counters configured to produce a pseudo-random sequence. The main clock changes the fundamental frequency. This noise would be white and then a simple filter to roll off the upper frequencies at a specified dB/decade will suffice for pink noise. I remember a sample circuit in the old TTL Cookbook 1974. But I'm certain there are other resources for this. Regards, -doug Douglas E. Powell Staff Engineer Corporate Compliance Department Advanced Energy Industries, Inc. Fort Collins, Colorado USA 80525 From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Scott Douglas Sent: Tuesday, November 14, 2006 4:43 PM To: 'EMC PSTC' Subject: Looking for Pink Noise Source Fellow List Peoples, Does anyone know of a place to obtain a good Pink Noise source? This is the noise specified in EN 60065, EN 55013, EN 55020 for testing consumer audio type equipment. The noise is bandwidth limited 22.4 Hz to 22.4 kHz with a max. 12 dB roll-off at the low end and max. 18 dB roll-off at the high end. The source could also be bandpass with zero slope cutoff at each end. I know there are pink noise sources, but have not been able to find one that is bandwidth limited and would rather not have to make filters to do that. An alternative might be *.WAV files with the noise encoded. If the source is equipment, I would like it to be simple enough for an EMC or safety test lab to operate without requiring an engineer to set up every time. If the source is a CD, where can I buy it? As always, any input will be much appreciated. Best regards, Scott Douglas - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message, including any attachments, may contain information that is confidential and proprietary information of Advanced Energy Industries, Inc. The dissemination, distribution, use or copying of this message or any of its attachments is strictly prohibited without the express written consent of Advanced Energy Industries, Inc. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
