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Hi-jack surround receiver DSP
Hi-jack surround receiver DSP
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Old 27th March 2010, 10:12 AM   #1
Kth is offline Kth  Denmark
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Join Date: Oct 2005
Default Hi-jack surround receiver DSP

Does anyone have experiences with "hi-jacking" a surround receiver and inserting their own DSP code?
Many surround receivers today come with a RS232 or similar connection making it possible to software upgrade them so I assume that it should be possible somehow to upload some of your own DSP code. Maybe there is already surround receivers on the market allowing the customers to insert their own DSP software?

I want to create a good and simple solution to a poor mans digital crossover. I need some basic filter routines for FIR and IIR filters, and also a delay. If the DSP chip for instance is ARM based I could write the routines myself. The problem as I see it is not to write the filter routines but more how to get your own code up and running on the receiver and get an overview of what addresses are used for what.
Another not so important but nice thing could be to remove all the DSP crap that you never use such as audio presets ("Rock", "Classic".."Stadium" etc.).

There is propably a lot of threads about this already but unfortunately I failed to find them when searching for it.

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Old 28th March 2010, 03:41 PM   #2
Kth is offline Kth  Denmark
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Join Date: Oct 2005
Does the lack of response mean that no one has experience with this?
Or is the question unclear or somehow stupid?
If it is because there is already a lot of threads about this it would be very helpfull to me if someone could point me in the right direction and give me a link.

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Old 28th March 2010, 07:41 PM   #3
rfbrw is offline rfbrw
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Perhaps it would be useful to find out just how cheap is the cheapest receiver with non mask-programmed DSP chip.
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Old 28th March 2010, 08:35 PM   #4
SoNic_real_one is offline SoNic_real_one  United States
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Location: Virginia
Both of my receivers had an EEPROM chip that contain the code. You would need a regular EEPROM reader/programmer and to disasamlbly the code.
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Old 29th March 2010, 04:02 PM   #5
Kth is offline Kth  Denmark
diyAudio Member
Join Date: Oct 2005
I think that for instance Nad T743 (which is reasonably cheap) has a RS-232 port that can be used to perform software updates. I assume these software updates involves changing the DSP code but I don't know for sure.

I can see it is quite up-hill if you do not have anything else than the assembly code. Do you know if the user input and display functionality is typically performed at another chip or is it the same DSP chip handling everything? And what kind of DSP chips was used in your receivers?
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