|21st February 2005, 07:55 AM||#22|
Join Date: May 2002
There are several reasons IMO:
1.) Nothing ever works as good in practice as it should work in theory. If it really would, then the Sharp D-S amps would have a much better SNR than their 100dB (Theoretically 270 dB @ 20 kHz).
2.) The chosen dither is certainly not optimal.
3.) The chosen NTF may not be optimal either since I didn't spend too much time on detemining it. I just chose 200 kHz cutoff and fourth-order Butterworth for the NTF and then derived the coefficients for achieving it. This choice is quite critical: the lower the cutoff frequency - the worse the SNR, the higher it is (i.e. aggressive noise-shaping) - the more the loop is prone to instability.
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Onkyo VLSC Vector Linear Shaping Circuitry||rjm||Digital Source||4||18th October 2011 12:10 PM|
|1st order Passive Line Level Crossover + 2nd order Highpass?||alexclaber||Multi-Way||11||4th January 2008 08:15 PM|
|deceptive perception ? 1st order-2nd order question||poldus||Multi-Way||4||11th April 2007 12:58 AM|
|Magnet proximity and faceplate shaping||kyrie48||Multi-Way||12||10th September 2006 10:32 AM|
|1st order ? L-R 2nd order? or transient perfect??||Ken L||Multi-Way||6||17th October 2003 05:22 PM|
|New To Site?||Need Help?|