Tb_

Yet another synth

15 posts in this topic

Hmmm,

I can't seem to see the video and even though I took 3 years of French in high school I can't understand what the page is saying about why I don't see a video...

Jack.

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It is supposed to be a link to download the file. But may be you do not have access ? I will try to upload to another location.

Thomas

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Very nice project Thomas I watched the demo video here afetr downloading it and it looks really awesome :) and I was really impressed with the sound here

for everyone who wants to see it, the download page is in french so please click on the link that I put in a red rectangle here :

post-29506-0-62708500-1355871769.jpg

and the translation of what he said at the end of the video is: " there are still some minor problems"

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Here is the demo video of this project, we uploaded it to youtube so you dont have to download it in order to watch it:

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Hi all

 

Nice project is possible post working source code and bit file ?

 

Many thanks

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Hello

 

It is not a breaking news, it is just a post for self motivation. :)

I use my papilio one to read a song wave from an sd card. Ok this doesn't sound incredible but now a way we see a lot of soft core to do this kind of things.

 

No firework, no picture, no video, there is nothing to show : i load the bitstream and 'magie' the song come from the speaker. And naturally no documentation meanwhile source code is available, in case some of you want to reproduce this at home !

 

Next step would be to read different samples of different length. You know with a 2Go SD card you can store an impressive number of sample...

I would like to be able play several sample coming from this card in the same time, 4 would be fine : usually a drummer have only 2 arms and 2 legs...

Then i could complete my midi synth with the drum channel, as in SK-synth but with different hw (no SRAM)  and far more voice...

 

Thomas

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Hi

 

I realize that i didn't post video update since a long time ago !!!

 

http://www.youtube.com/watch?v=YadhN8LuyPg

 

The sound is very low, because my speaker are quite away from my camera.

 

Also it is the same midi file play used in the first demo but the design have completely change.

 

The design still produce sound at 48Khz and is drive by midi protocol. I also implement pitchbend, aftertouch. Note off feedback.

 

I pass the design at 96Mhz to avoid clock domain crossing between the uart and the synthesizer core. But today I am not sure it was a good idea. dummy because I run into timing not met issues : MULT18X18SIO seems to have propagation delay not in line with a clock at 96Mhz, so i change all my multiplier by core generate pipelined instance. So the design use more resources with no gain in feature... The benefice are that now i have enough cycle to loop the 256 row of my RAM16 and play 256 sounds at the sample time. While at 32Mhz i was limited to about 160 and i can avoid clock domain crossing (In a previous version the uart was working at 96Mhz but the synthesizer core run only at 32Mhz)

 

Also if i wish to port on a spartan6, I can probably review this part to have a better usage of the fpga resources.

 

If someone have a working example on how to setup a multi-cycle path constraint i am interest to learn : all my attempt failed to setup the constraint.

 

Next step ... add  the drum channel

 

Thomas

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Sweet! We need to get this posted to the blog.

 

Jack.

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Project update

I finally manage to add drum. Actually it read sample from the SD card. The current design is limited to one drum sound at the time. But I have in mind to enhance the system and be able to reproduce 4 drum sound in the same time in addition to the other sound ( up to 252 ).

Even if I rework the design it is not yet timing net. More work on timing exception is required.

I record a new video of the same midi song unfortunately I didn't improve my record sound system so the sound of the video is still very low and bass drum is quite difficult to heard...
http://youtu.be/XX9kjhRqEsM

 

Thomas

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