Subject: Re: About importance of "phase" in sound recognition From: James Johnston <James.Johnston@xxxxxxxx> Date: Fri, 8 Oct 2010 12:44:31 -0700 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>May I propose a simple test. Get out matlab. Do a 2^20th fft. In the bin corresponding to 500Hz, your choice of sampling frequencies, put a '1'. In the bins corresponding to 996 and 1004, put a .25. Conjugate appropriately. Do IFFT. Set energy of the time domain signal to something sensible. Listen to it. Now, instead of putting in .25 for the 1004Hz tone, put in -.25 Repeat, using the same gain so as to avoid intensity differences. Listen to that. Were I allowed to release code, I would include the matlab code to make your life easier. It's not exactly rocket sicence. To me, at least, they are different sounds. Jj __________________________ James D. Johnston (jj@xxxxxxxx) CHIEF SCIENTIST - DTS, Inc. 425-814-3200, ext. 134 - office 425-814-3204 - fax 206-321-7449- mobile 11410 NE 122nd Way, Suite 100 Kirkland, WA 98034 This electronic transmission (and/or the documents accompanying it) may contain confidential and privileged information. Any unauthorized use, copying or distribution is prohibited. If you have received this communication in error, please notify DTS, Inc immediately by telephone (425-814-3200) and destroy the original message. Messages sent to and from us may be monitored. Notice: This message and any included attachments are intended only for the use of the addressee, and may contain information that is privileged or confidential. If you are not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please destroy the original message and any copies or printouts hereof.