I read in the JAES (vol 51, no 1/2 p82) about class D, I and T in a article about Audio Precision.
D = is switched amp but what is I and T?
D = is switched amp but what is I and T?
Since we in Sweden have three extra letters after z, I suggest that we also define class Å, Ä and Ö and we must also consider class Ü so the germans guys will stay happy.....
Seriously, is class I and T an "accepted" class?
Seriously, is class I and T an "accepted" class?
Imagine all the classes of amps possible in China.peranders said:Since we in Sweden have three extra letters after z, I suggest that we also define class Å, Ä and Ö and we must also consider class Ü so the germans guys will stay happy.....
Seriously, is class I and T an "accepted" class?
Will be a hard task to invent so many different
amplifying principals. 🙂
/class of halo
Hi Peranders
A search on Google: http://www.google.be/search?hl=nl&ie=UTF-8&oe=UTF-8&q="class+T+amp&meta= revealed a lot of Class T amps. They seem to be used in the car-audio world.
Here's a clittle more explanation on the T-class http://www.tripath.com/downloads/an2.pdf
Nothing on Class I, but here http://www.mtt.org/ims2000/wma.htm they list almost the whole alphabet.
And here they stoped at H: http://www.win.net/audtatious/audio/ampclass.html
/Hugo
A search on Google: http://www.google.be/search?hl=nl&ie=UTF-8&oe=UTF-8&q="class+T+amp&meta= revealed a lot of Class T amps. They seem to be used in the car-audio world.
Here's a clittle more explanation on the T-class http://www.tripath.com/downloads/an2.pdf
Nothing on Class I, but here http://www.mtt.org/ims2000/wma.htm they list almost the whole alphabet.
And here they stoped at H: http://www.win.net/audtatious/audio/ampclass.html
/Hugo
JBl just developed a class I amp pushing out 6000Wrms in conjuction with crownaudio.com.
http://www.crownaudio.com/pdf/amps/136225.pdf
http://www.jbl.com/car/jbl_crown_amp.asp
http://www.crownaudio.com/pdf/amps/136225.pdf
http://www.jbl.com/car/jbl_crown_amp.asp
Umm, enough... lol... But thats RMS, so, you either need to be able to supply 3 times the current, or you have a few thousand farad of caps.. Power cable rated at 500amps should be enough.... but better go for 800, just in case.. lol
The class I designation seems to be a continuation of a bad habit, started by Tripath by calling their class-d modulation scheme class-T. Now everyone wants an own class designator ...... !!!!
The class I uses ordinary PWM modualtion in conjunction with a less ordinary (but quite clever) output stage topology (Crown's BCA). It minimizes cross-conduction, eliminates some adjustments and improves carrier suppression - all at once.
Class T is a delta-sigma (or one bit) modulation scheme, i.e. one possible form of class-d. It uses modulators of 2nd or 3rd order.
Regards
Charles
P.S.: If you'd like to know the difference between delta-sigma and PWM I can add graphics.
The class I uses ordinary PWM modualtion in conjunction with a less ordinary (but quite clever) output stage topology (Crown's BCA). It minimizes cross-conduction, eliminates some adjustments and improves carrier suppression - all at once.
Class T is a delta-sigma (or one bit) modulation scheme, i.e. one possible form of class-d. It uses modulators of 2nd or 3rd order.
Regards
Charles
P.S.: If you'd like to know the difference between delta-sigma and PWM I can add graphics.
I also think it's kind of silly this T and I classes. This hasn't anything to do with operating point of the transistor. Class D is on or off but if the business accept more classes (A, B, AB, C, D, H) it's OK with me.
- Status
- Not open for further replies.