8 channel LPCM over HDMI, It's Multi Amp for Everyone

[KOON3876]

Hi Today I could play Linear PCM 7.1 channel WAV file with HDMI mobo, to DENON AVR-1908, and LINN Komponent 104 3Way active mode.

For detail please see my site.

http://koonlab.com/MultiAmpForEveryone/FIR_HDMI_AVAMP.html

 

[soundcheck]

Hi Koon.

Good to see your progress.

As far as I understand. You're generating a multichannel .wav file
which you send over HDMI.

Why not 6 seperate PCM channels?

The Denon amp is not a full digital amp, right!?!

Have you looked in building a multichannel HDMI receiver?
A dedicated multichannel HDMI receiver with I2S-out would solve a lot of problems in the DIY community.


Cheers
\Klaus

 

[soundcheck]

Koon.

Ever thought about switching to Linux?

 

[phofman]

Well, HDMI multichannel support in ALSA is not exactly complete

 

[KOON3876]

Why not 6 seperate PCM channels?
The Denon amp is not a full digital amp, right!?!
Have you looked in building a multichannel HDMI receiver?
[/B]

multi channel WAV file contains 8 PCM channels inside, and each channels are syncronized.

Denon amp is not a full digital.
Just selected cheap HDMI1.3 Linear PCM 8 channel compatible.

HDMI-I2S?
HDMI receiver will require thousands $ per year just to be a member, and I don't think individual person can be a member.
=================
This is "MultiAmp for Everyone" project,
Remember I already have "FIR and Full digital multi amp" only for me, by USB2.0-I2S, and 4 Channel Full digital.
=================

Linux:
If I can use Microsoft Visual Studio 2008 on Linux, I can switch to Linux. and If package software market sales on Linux is greater than Windows, I WILL switch to Linux

 

[soundcheck]

I stepped over this:

http://www.vativ.com/pdf/18-00PB-C032.pdf

Perhaps an evaluation board is the way forward.
Though it seems that they don't have all outputs accessable.
And I am also wondering if it would decode the multichannel
.wav

I just left Entropics a message to see if they offer multichannel
audio eval boards.

 

[thomaseliot]

Panasonic SA-XR57

This has HDMI input and use TI "PurePath" all digital technology

It looks like a good poor man KoonsLabs system solution

I just need to find somebody from USA that can buy it from Amazon for $229.99 and send it to me.

 

[KOON3876]

Hi Thomas I think you need SA-XR700, in user's manual

"The unit is compatible with linear PCM 8-channel surround
signals decoded by the BD player and other equipment (up to
96 kHz/24 bit). See the operating instructions for equipment
used for playback."

but nothing I can find in SA-XR57 manual about linear PCM 8 channel.

 

[thomaseliot]

Yes, linear PCM 8-channel surround. How do you produce it from ordinary stereo wav files we already have on the PC?

 

[KOON3876]

Pls see these 2 page,

http://koonlab.com/CUDA_RealFIR/CUDA Real FIR.html

http://koonlab.com/MultiAmpForEveryone/FIR_HDMI_AVAMP.html

 

[tschanrm]

Excellent work Koon! Is there a way to get this working so you could stream any audio source in? For instance, I have two sound cards. One soundcard takes any external audio - analog signal/digital signal, and sends an SPDIF signal to the second sound card. The second sound card applies realitime FIR crossover and channel delay to that incoming S/PDIF signal. So, in essence, I can listen to anything realtime - TV, sports, movies, and of course music., I just need to hook it up to the first sound card.

 

[KOON3876]

Hi tschanrm, actually I don't have full knowledge of multimedia streaming, but it will be convenient.

(1) Output stream : I don't have to keep huge 8 channel wave file.
(2) Input stream : selectable for stored WAV file, or external input.

I wonder there should be many "multimedia programmer" skilled than me but no contact or feedback yet.

Maybe stream handling will be difficult than file handling, but sometime I hope to study / implement....

 

[soundcheck]

Hi folks.

When it comes to routing flexibility Linux respectively ALSA lets you do quite some weired stuff:

http://alsa.opensrc.org/SurroundSound

The questions remains if I can address and send data over HDMI Tx ch0 to RX ch0, Tx ch1 to Rx ch1 asf. And on the Rx side map Rx0 to Amp0, RX1 to Amp1....

@Thomaseliot: There you can also read how to route from stereo .wav to multichannel.

Cheers

 

[KOON3876]

I uploaded test tone wave file, to make it easy to test your environment can play 8channel audio.
CH1,2,3,4,5,6,7,8 = { 200, 400,600,800,1000,1200,1400,1600 Hz}

Playing in Loop mode, attaching single speaker to each speaker terminal of AV Amplifier.. easy to check 8 channel is played or not.

and source code to make this wave file is also available.

http://koonlab.com/MultiAmpForEveryone/FIR_HDMI_AVAMP.html

 

[soundcheck]

BTW:

Auzentech and Asus coming up with 8*LPCM over HDMI PCI soundcards.

http://www.bit-tech.net/hardware/2008/06/02/computex-2008-psp/1

http://www.xpmediacentre.com.au/com...first-card-support-hdmi-1-3-dolby-truehd.html

 

[phofman]

The wonderful audio Swiss Army knife SoX http://sox.sourceforge.net/ provides LOTS of functions, among them merging audio files to create multitrack outputs. Works fine on windows too. You may find it useful just as I did And btw writing a new effect module is pretty simple, sox just passes x-dimensional arrays of long ints, all the format conversions and the other stuff taken care of.

 

[soundcheck]

Koons fir-engine output could be piped realtime into Sox, which outputs the multichannel-wav over HDMI?
Is this your idea with Sox?

 

[phofman]

Well, I do not know about piping multiple streams through sox on windows (I guess not feasible), I think Koons FIR engine produces multichannel output directly.

 

[soundcheck]

Koon is using a multichannel .wav and not mutiple streams as far as I understood.

 

[fb]

Perhaps an ideal solution would be

Audio app -> Jack -> Koon's FIR engine -> Jack -> HDMI out

Jack is available for Windows and OSX now as well as linux. I wonder if Koon's FIR engine is suitable for realtime processing of streams? Possibly it could be ported to Linux and OSX as well.