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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jun 17 2009 :  11:21:40 PM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
DSSSS Head Unit Revision 2:

Download Attachment: DSS head unit layout Rev2.png
46.57 KB
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jun 20 2009 :  08:22:48 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
This project is taking a new coarse.

I quote this from my project description file.

quote:

Advanced Digital (H)ome (T)heatre (S)ystem
System Overview:
The purpose of this system is to provide an advanced yet simple to use all-in-one media management solution for all the broadness of today's digital home theatre needs. System components include one head unit, a minimum of 1 subwoofer unit and a minimum of 1 surround speaker unit of which there are 7 needed to fulfil the 7.1 surround sound specification. Extra speaker units can be assigned to an audio channel to increase loudness. All speaker units are wireless from the head unit and only need to be powered from a mains wall socket; this can reduce cable mess. The head unit features everything you could want in today's digital media world. Features of the head unit are listed below. Since this is a digitally oriented HTS, costs can be reduced by not including certain analogue input and output interfaces on the head unit. The direction this HTS follows is down a digital pathway. Digital technologies fulfil the shortcomings of analogue technologies.



It's just a snippet. I need write things like this, as I have leart from past experiences. It gives me a clear outline of what must be done.

I have two weeks off from Uni so I'll be planning and designing for this HTS. I'll also be working on my physics simulator which will be used to model and simulate optimal speaker enclosures. One hell of a job... Hobby

When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jul 12 2009 :  12:35:42 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
The Class D audio amplifier is being designed right now. I'm trying to achieve minimal rise and fall times on the output and also minimize cross over current on high and low side MOSFETs. I'm experimenting with discrete MOSFET drivers.
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jul 12 2009 :  11:00:34 PM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
What do you say guys, should I stick with a discrete MOSFET driver on the output stage of my Class D amplifier or get an IC driver? I know it all comes down to cost and performance but I need some opinions from people who have been involved with audio longer than I have.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jul 14 2009 :  07:47:50 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
Stay tuned, video comming soon!
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jul 15 2009 :  06:23:27 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
Here's the video. It shows shows how I made a simple analogue audio PWM modulator.

http://www.mediafire.com/?ymn2yzn5ehi
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jul 17 2009 :  08:23:48 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
Since this is supposed to be a digitally oriented system it would make sense to minimize the amount of analog circuitry before the output stage.

A problem I encountered when designing a fully digital Pulse Width Modulator:
Required sample rate: 192KHz
PWM frequency: 768KHz
Audio sample resolution: 24-bit

Using a 24-bit capture compare unit and a 24-bit counter. I need the counter to overflow every 1.3020833us (768KHz).
This required a clock frequency of 12.885THz into the counter clock input:
2^24 * 768000 = 12.885THz
That's crazy!

I will therfore need to create an Interpolation technique that can work with a lower clock frequency. Back to the drawing board...
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
Edited by - wasssup1990 on Jul 17 2009 08:24:21 AM
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jul 21 2009 :  09:49:08 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote


Download Attachment: Head Unit Block Diagram.png
75.89 KB
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mrgone
Nobel Prize Winner

USA
1176 Posts
Posted - Jul 24 2009 :  07:20:54 AM  Show Profile  Reply with Quote
Wow! That's about all I can say right now is....Wow!

That looks like quite an undertaking. I will have to review some of the material.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jul 24 2009 :  07:43:04 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
Hi Frank,

Yes I'm still uncertain about a few things but that diagram gives a ruff idea of what I want to do. The key to any successful project is planning.

See ya!
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jul 25 2009 :  12:53:58 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote


Download Attachment: Dither.png
117.63 KB
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jul 27 2009 :  04:21:35 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
Handy info found here for hard switching MOSFETs.
http://www.smps.com/Knowledge/MOSFET_Switching/FETsw_p1.shtml

This link will be added to the first post.
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jul 27 2009 :  06:13:02 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote


Download Attachment: Head Unit Block Diagram Rev2.png
93.75 KB
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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mrgone
Nobel Prize Winner

USA
1176 Posts
Posted - Jul 27 2009 :  11:07:33 PM  Show Profile  Reply with Quote
Johnny, I cannot even keep up with all of this. Just tell me when I can order one from ya.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Jul 27 2009 :  11:34:53 PM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
Hehe

Thanks Frank! I never intended to sell this marvel, only to possibly wow my employers. If things go according to plan I might just make a replica and ship it over to you for a price of course, this stuff isn't cheap.

See ya!
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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