Hi-jack surround receiver DSP

Kth · 27th March 2010, 09:12 AM

Hi,
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.

/Kim

Kth · 28th March 2010, 02:41 PM

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.

/Kim

rfbrw · 28th March 2010, 06:41 PM

Perhaps it would be useful to find out just how cheap is the cheapest receiver with non mask-programmed DSP chip.

SoNic_real_one · 28th March 2010, 07:35 PM

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.

Kth · 29th March 2010, 03:02 PM

rfbrw:
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.

SoNic_real_one:
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?

27th March 2010, 09:12 AM	#1
Kth diyAudio Member Join Date: Oct 2005	Hi-jack surround receiver DSP Hi, 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. /Kim

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
FS: Yamaha DSP-AX620 surround sound amp	DavidJE	Swap Meet	0	21st April 2009 10:57 AM
IR Receiver - 3.5mm jack for Home theater Processor	JRace	Parts	5	30th March 2009 02:57 AM
Yamaha surround receiver questions	daring	Chip Amps	6	6th July 2008 08:28 PM
Connecting EQ to Surround Receiver	sdclc126	Multi-Way	7	28th February 2005 06:15 PM
Surround sound from an integrated stereo receiver ?	fireman	Everything Else	4	20th January 2004 12:39 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

28th March 2010, 02:41 PM	#2
Kth diyAudio Member 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. /Kim

28th March 2010, 06:41 PM	#3
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Perhaps it would be useful to find out just how cheap is the cheapest receiver with non mask-programmed DSP chip.

28th March 2010, 07:35 PM	#4
SoNic_real_one diyAudio Member Join Date: Jan 2008 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.

29th March 2010, 03:02 PM	#5
Kth diyAudio Member Join Date: Oct 2005	rfbrw: 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. SoNic_real_one: 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?