--- In [email protected], "in3otd" <[EMAIL PROTECTED]> wrote: > > Maybe someone on the group who is less programming impaired than me > could synthetically generate an SSB signal demodulated with different > phase shifts to see if the differences can be heard... > > Best regards, > > Claudio, IN3OTD >
Claudio, no need to program anything to hear (or to not hear...) the differences between two sounds with components of different phases. I generated with Adobe Audition a sound file with a 800 Hz tone, summed with its second harmonic at 1600 Hz, which had 0 degrees of phase difference at time 0 (arbitrarily chosen). Then I did the same, but now the phase difference at time 0 was 90 degrees. I prepared a simple Web page where it is possible to see the two waveforms (quite different one from the other) and to hear them. To my ears they sound _exactly_ the same. The page is at http://sundry.i2phd.com/phase.html This means that the following assertion probably is not valid : 5) If we put a multiple monochromatic signal in a system with flat response, linear amplitude response and NOT flat group delay, will the signal be distorted ? YES .NEW SIGNALS (DISTORTION )WILL BE CREATED FROM THE GROUP DELAY BEING NOT FLAT ,LIKE WHEN THERE IS ONLY NON LINEAR AMPLITUDE RESPONSE . 73 Alberto I2PHD
