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radix 4 complex fft by ZHAO Ming ==> DCT
by Unknown on Jul 7, 2004 |
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hello,
I tried the cfft code with 64k and external dualported srams. everything worked well. because i'm analysing an interferrogramm, I neither need a complex fft nor a fft, but a discret cosinus transform would be enough. As a consequence, I would get disposed of one external dport-ram (the Qram). maybe anybody has an idea, how to modify the original code to get get cosinus transform. I tried the cfft code with only one external ram, but the intermediate results of the core are mixed in both dport-rams. glad about any response and still waiting greeting from the rainy south of germany Dennis |
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radix 4 complex fft by ZHAO Ming ==> DCT
by Unknown on Jul 7, 2004 |
Not available! | ||
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Hi Dennis,
Did you have a look into the "video compression system" project? I think
it includes a DCT block.
Guenter
Greetings back from the Rhein-Main area. Seems like we will get a rainy
summer.
dennis.binder at ipm.fhg.de wrote:
hello,
I tried the cfft code with 64k and external dualported srams.
everything worked well.
because i'm analysing an interferrogramm, I neither need a complex fft
nor a fft, but a discret cosinus transform would be enough.
As a consequence, I would get disposed of one external dport-ram (the
Qram).
maybe anybody has an idea, how to modify the original code to get
get cosinus transform.
I tried the cfft code with only one external ram, but the intermediate
results
of the core are mixed in both dport-rams.
glad about any response and still waiting
greeting from the rainy south of germany
Dennis
_______________________________________________
http://www.opencores.org/mailman/listinfo/cores
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radix 4 complex fft by ZHAO Ming ==> DCT
by sradio on Jul 8, 2004 |
sradio
Posts: 1 Joined: Oct 25, 2002 Last seen: Jan 6, 2016 |
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The read address is diffrent from write address, so need a dualport ram.
My advice
1.Some new FPGA have many onchip dualport rams
2.slow down the speed, double size the singleport ram,add some
necessary circuit.
----- Original Message -----
From: dennis.binder at i...dennis.binder at i...>
To:
Date: Wed Jul 7 12:43:06 CEST 2004
Subject: [oc] radix 4 complex fft by ZHAO Ming ==> DCT
hello,
I tried the cfft code with 64k and external dualported srams. everything worked well. because i'm analysing an interferrogramm, I neither need a complex fft nor a fft, but a discret cosinus transform would be enough. As a consequence, I would get disposed of one external dport-ram (the Qram). maybe anybody has an idea, how to modify the original code to get get cosinus transform. I tried the cfft code with only one external ram, but the intermediate results of the core are mixed in both dport-rams. glad about any response and still waiting greeting from the rainy south of germany Dennis |
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radix 4 complex fft by ZHAO Ming ==> DCT
by Unknown on Jul 8, 2004 |
Not available! | ||
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hello Günter,
it looks like this DCT has only a fixed size of 64.
Or am I wrong ?.
I need a size of 64k.
Thanks
Dennis
----- Original Message -----
From: Günter Dannoritzerdannoritzer at w...>
To:
Date: Wed Jul 7 15:09:43 CEST 2004
Subject: [oc] radix 4 complex fft by ZHAO Ming ==> DCT
Hi Dennis,
Did you have a look into the "video compression system"
project? I think
it includes a DCT block.
Guenter
Greetings back from the Rhein-Main area. Seems like we will get a
rainy
summer.
dennis.binder at i... wrote:
> hello,
> > I tried the cfft code with 64k and external dualported srams. > everything worked well. > because i'm analysing an interferrogramm, I neither need a complex fft
> nor a fft, but a discret cosinus transform would be enough.
> As a consequence, I would get disposed of one external dport-ram (the
> Qram).
> > maybe anybody has an idea, how to modify the original code to get
> get cosinus transform.
> I tried the cfft code with only one external ram, but the intermediate
> results
> of the core are mixed in both dport-rams.
>
> glad about any response and still waiting
>
> greeting from the rainy south of germany
> Dennis
> _______________________________________________
> http://www.opencores.org/mailman/listinfo/cores
>
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