Hi-end DSP based multi-channel integrated Preamp/Crossover/DAC project - Page 10

Tytte71 · 24th January 2015, 03:53 PM

I'm really looking forward to see this thing up and running. A nice feature for the control board would be to enable the user to use separate pushbuttons to allow for creative and individual front panel designs.

Hsmeets · 24th January 2015, 04:18 PM

Quote:

Originally Posted by Tytte71

I'm really looking forward to see this thing up and running. A nice feature for the control board would be to enable the user to use separate pushbuttons to allow for creative and individual front panel designs.

+1

jcga · 24th January 2015, 05:16 PM

Quote:

Originally Posted by Tytte71

I'm really looking forward to see this thing up and running. A nice feature for the control board would be to enable the user to use separate pushbuttons to allow for creative and individual front panel designs.

+1

muhromatic · 25th January 2015, 11:53 PM

Stumbling upon this thread just made my day, month and hopefully year exponentially more enjoyable... Thank you and count me in.

Tranquility Bass · 07:26 AM

Quote:

Originally Posted by muhromatic

Stumbling upon this thread just made my day, month and hopefully year exponentially more enjoyable... Thank you and count me in.

Welcome to the DIY forum. I hope you enjoy it

regards
David

Tranquility Bass · 07:38 AM

Quote:

Originally Posted by Tytte71

I'm really looking forward to see this thing up and running. A nice feature for the control board would be to enable the user to use separate pushbuttons to allow for creative and individual front panel designs.

Yes this is a good idea and solves the problem of wanting to use more exotic navigation controls such as the Navimec control. I will split the board into two so that it is easier to use different navigation controls

regards
David

Tytte71 · 26th January 2015, 05:27 PM

Superb

ArtsyAllen · 26th January 2015, 07:21 PM

I still have not heard back from HDMI, not that should be of any surprise to anyone. They are heavily licensed and into the big $$$$$, I was way out of my league even contacting them.

So I am going to eat some crow here, and apologize if I have mislead anyone with my excitement on post #59.

As I more then likely will never hear anything from HDMI, I have dug a little deeper myself on various HDMI Receivers and Transmitters...

First of all, if HDMI signal is encrypted with HDCP, then the HDMI receiver and transmitter will need to be HDCP compliant. There are a lot of stand alone HDCP compliant boards that are designed for the AVR market. Many of these offer extracted, unencrypted I2S lines that can be plugged into this pre-amp. But, I am not sure if these big corporations would be willing to deal with this. Yet, the potential demand in the market for a pre-amp like this is large enough that there is $$$$$ to be had for any of these board manufacturers willing to take a leap of faith.

Some examples:

http://www.grandbeing.com/product/HDMI%20Audio%20Extractor.htm

2nd Generation HDMI Repeater/Switchers with Audio Extract - Momentum Data Systems

As it stands, if the HDMI input Tranquility has designed in this pre-amp is not HDCP compliant, there is no guarantee it will work for decoded Movie based 7.1 audio. It might work with the OPPO Blu-ray players, as they have two HDMI outputs were the audio can be split off, but I am not sure if the HDCP encryption is removed. I will need to do some more research to see. I am sure Oppo will communicate with me, they are good folks.

Now there is another option for PC based users. One can use a USB interface to transmit decoded 7.1 audio to an 8 channel USB interface. [COLOR="rgb(160, 82, 45)"]Tranquility[/COLOR] has designed this pre-amp with the Amanero Combo 384 which is only two channel, but it works up to 384 kHz sampling rate. Most USB 8 channel interfaces only go up to 192 kHz, so that is the trade off.

One can use the MiniDSP USBstreamer and run at least one of the I2S (stereo) lines into PSAudio interface. I am not sure if [COLOR="rgb(160, 82, 45)"]Traniquility[/COLOR] has designed this board to run the various inputs simultaneously. For example with a LPCM 7.1 signal: inputting the front channels into the PSAudio interface, running the side channels via USB, back surrounds via SPDIF and Center and Sub via SPDIF. I would not do this my self, but wondering if the possibility is there.

So I hope this helps clarify things a little better. I may still have some of this wrong, but I think there is some hope for multi-channel Dolby and DTS applications.

Allen

anjump123 · 26th January 2015, 07:30 PM

Looks like a winner!

I've been looking at an active crossover/ DSP for my system for a long time. I've considered various ones like the DCX2496 through to the DEQX (way too expensive but probably the best).

I need to learn a lot more about the various programs used to create filters and DSP in general.

I don't know if it's still beneficial but is it possible to use multiple power supplies to each stage?

What are you considering for the analogue output stage/s and their power supplies?

Sorry if I'm asking stupid questions but I've been away from electronics DIY for quite a few years and need to catch up. Last thing I built was an Audio synthesis DAC (PCM63K) which uses over 12 power supplies.

anjump123 · 26th January 2015, 07:36 PM

This may (or may not)) help
How to get bitstreamed S/PDIF digital audio out of a laptop without spending a fortune — Dark's Code Dump

I'm also trying to figure out a way of getting audio ( plus DSD) out of HDMI.

26th January 2015, 07:21 PM	#98
ArtsyAllen diyAudio Member Join Date: Mar 2011 Location: Ironwood, Upper MI	HDMI, $$$$$, USB and some Hope... I still have not heard back from HDMI, not that should be of any surprise to anyone. They are heavily licensed and into the big $$$$$, I was way out of my league even contacting them. So I am going to eat some crow here, and apologize if I have mislead anyone with my excitement on post #59. As I more then likely will never hear anything from HDMI, I have dug a little deeper myself on various HDMI Receivers and Transmitters... First of all, if HDMI signal is encrypted with HDCP, then the HDMI receiver and transmitter will need to be HDCP compliant. There are a lot of stand alone HDCP compliant boards that are designed for the AVR market. Many of these offer extracted, unencrypted I2S lines that can be plugged into this pre-amp. But, I am not sure if these big corporations would be willing to deal with this. Yet, the potential demand in the market for a pre-amp like this is large enough that there is $$$$$ to be had for any of these board manufacturers willing to take a leap of faith. Some examples: http://www.grandbeing.com/product/HDMI%20Audio%20Extractor.htm 2nd Generation HDMI Repeater/Switchers with Audio Extract - Momentum Data Systems As it stands, if the HDMI input Tranquility has designed in this pre-amp is not HDCP compliant, there is no guarantee it will work for decoded Movie based 7.1 audio. It might work with the OPPO Blu-ray players, as they have two HDMI outputs were the audio can be split off, but I am not sure if the HDCP encryption is removed. I will need to do some more research to see. I am sure Oppo will communicate with me, they are good folks. Now there is another option for PC based users. One can use a USB interface to transmit decoded 7.1 audio to an 8 channel USB interface. [COLOR="rgb(160, 82, 45)"]Tranquility[/COLOR] has designed this pre-amp with the Amanero Combo 384 which is only two channel, but it works up to 384 kHz sampling rate. Most USB 8 channel interfaces only go up to 192 kHz, so that is the trade off. One can use the MiniDSP USBstreamer and run at least one of the I2S (stereo) lines into PSAudio interface. I am not sure if [COLOR="rgb(160, 82, 45)"]Traniquility[/COLOR] has designed this board to run the various inputs simultaneously. For example with a LPCM 7.1 signal: inputting the front channels into the PSAudio interface, running the side channels via USB, back surrounds via SPDIF and Center and Sub via SPDIF. I would not do this my self, but wondering if the possibility is there. So I hope this helps clarify things a little better. I may still have some of this wrong, but I think there is some hope for multi-channel Dolby and DTS applications. Allen

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24th January 2015, 03:53 PM	#91
Tytte71 diyAudio Member Join Date: Oct 2010	I'm really looking forward to see this thing up and running. A nice feature for the control board would be to enable the user to use separate pushbuttons to allow for creative and individual front panel designs.

25th January 2015, 11:53 PM	#94
muhromatic diyAudio Member Join Date: Jan 2015	Stumbling upon this thread just made my day, month and hopefully year exponentially more enjoyable... Thank you and count me in.

26th January 2015, 05:27 PM	#97
Tytte71 diyAudio Member Join Date: Oct 2010	Superb

26th January 2015, 07:30 PM	#99
anjump123 diyAudio Member Join Date: Nov 2010 Location: London	Looks like a winner! I've been looking at an active crossover/ DSP for my system for a long time. I've considered various ones like the DCX2496 through to the DEQX (way too expensive but probably the best). I need to learn a lot more about the various programs used to create filters and DSP in general. I don't know if it's still beneficial but is it possible to use multiple power supplies to each stage? What are you considering for the analogue output stage/s and their power supplies? Sorry if I'm asking stupid questions but I've been away from electronics DIY for quite a few years and need to catch up. Last thing I built was an Audio synthesis DAC (PCM63K) which uses over 12 power supplies.

26th January 2015, 07:36 PM	#100
anjump123 diyAudio Member Join Date: Nov 2010 Location: London	This may (or may not)) help How to get bitstreamed S/PDIF digital audio out of a laptop without spending a fortune — Dark's Code Dump I'm also trying to figure out a way of getting audio ( plus DSD) out of HDMI.