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Posts by jcx

always check parts, solder joints, wiring - feedback circuits can "work" even with some major components  not doing what was intended   check operating points/bias current with no signal - are the ccs about right, do the drain R currents nearly match, add up to the ccs current? (measure the dV across the Rs involved, calculate the currents, sometimes a kOhm or more in series with a digital multimeter is needed to keep meter input Z and noise from interfering with analog...
quick reader? actually understood all the references, terminology, math in the paper?  - there's a lot the willing learner could find with keywords in my posts that could lead to good references   as I said few are interested in adversarial debate as a teaching tool for engineering science and technology basics
definitely the expected problem with the thread - newbies, those without tech background use debate rhetoric scoring as a proxy for deciding technical correctness m3_arun appears to have just scratched the surface of the engineering, technical description of signal representation, "digital" representation of analog signals and converter technologies the projecting too far with "logic" from too narrow a base of domain knowledge is well known - called "Sophomoric" for good...
it really is the case - one of the basics of how to learn about something is to look at current practice, why is accepted by the industry read the white papers, seminar and app notes of Analog Devices, Texas instrument, other manufacturers on their delta sigma products, the datasheets, demo circuit's performance it should tell you your conception has problems and you need to learn more coming here with half baked ideas and denouncing an entire technical field, challenging...
but to be really convincing head tracking is needed - we are deeply wired neurologically to use head motion to help localize external sound source locations - so the sound from each headphone driver needs to change as we turn our heads   if the sound entering the ears doesn't change as we move then our brain fails in the external localization and we mostly get the typical headphone "inside our head" soundstage like a line between the ears   the Smyth SVS Realizer is...
so this is what we get with modern ed theory, schools pushing "self discovery", "self esteem" above teaching?   most of us aren't Newton, Einstein and Hawking all rolled up into one, able to use "pure reason" to understand the world - in fact they didn't either- they studied, learned from predecessors, books, schooling, university classes, professors...     no one I know wants to play adversarial rhetorical debating games with their students at every point - students...
psychoacoustics also has bearing - just how much frequency deviation can be heard: http://djcarlst.provide.net/abx_crit.htm
our hearing is wired deep in the auditory neurons to try to place sounds in 3d space relative to your body to know which way to look or run our brains are wired to expect/compenstate for our head/body movement while localizing sounds in the environment   speakers in rooms are audibly clearly outside your head, fixed in space   many hear headphone sound stage as being inside their head, pretty much along a line between your ears particularly when moving your head with...
there is a fixed relation between frequency slope and phase in analog simple filters: the term "minimum phase" is often used   if what you are EQing frequency response is minimum phase then you want your EQ to also have minimum phase characteristic so that the the boosts and dips that flatten the frequency response also fix up the phase response   some of the frequency response of headphones can be largely minimum phase - particularly at lower frequencies - the...
 so someone else can figure the Pass' SUSY expiration date too
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