1021 converts to PCM up to DSD256. It is the max 384kHz PCM which imposes the hard limit.
What do you mean by that.
Does the DAM 1021 not support native DSD, only DOP (DSD over PCM) ?.
Or am I misunderstanding ?.
I wish to have a signal lock indicator on the front panel of the chassis. Can anyone give me some tips on how to do this?
Get some fiber for light, fix one side to the indicator led on the board, and make a small hole in the chassis and glue the other end, flush to the outer side - mechanical solution ;-) ?? It might be to dim in day light maybe...
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Get some fiber for light, fix one side to the indicator led on the board, and make a small hole in the chassis and glue the other end, flush to the outer side - mechanical solution ;-) ?? It might be to dim in day light maybe...
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Thank you for the suggestion. Next.
In the first firmware rev, I only reserved 256 Kbyte in the 1 Mbyte Flash for filters, didn't matter then as the filters started out as 1K filters.
Now with larger filters you have to be careful what you do, a 4K filter is 16 Kbyte, and with seperate filters for all types and all samlerates, you can fill up those 256 Kbyte, and then there is also the DSD filters....
I'm also looking to move to 36 bit or 40 bit filters, so at some time I might reorganize things a little, there is no need to reserve 256Kbyte for the uC, although thery're are available with 256 Kbyte flash, I have never used larger than the 64 Kbyte version.
In next gen boards I will move up to 2 Mbyte flash, mostly to have space for a larger FPGA. But don't hold out for anything soon on the boards, first up is the dac2541, a successor to the dac1541....
Plus the larger the file, the longer time it takes to download....
Now with larger filters you have to be careful what you do, a 4K filter is 16 Kbyte, and with seperate filters for all types and all samlerates, you can fill up those 256 Kbyte, and then there is also the DSD filters....
I'm also looking to move to 36 bit or 40 bit filters, so at some time I might reorganize things a little, there is no need to reserve 256Kbyte for the uC, although thery're are available with 256 Kbyte flash, I have never used larger than the 64 Kbyte version.
In next gen boards I will move up to 2 Mbyte flash, mostly to have space for a larger FPGA. But don't hold out for anything soon on the boards, first up is the dac2541, a successor to the dac1541....
Plus the larger the file, the longer time it takes to download....
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Take a look of the source file, each time you double the samplerate rate you halve the number of taps, so 88/96K = 2K taps, 176/192 = 1K taps
FIR2?
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Hi all, I'm slowly building a dam1021 dac and for now I'm working on the power supply. I just finished the Reflektor-D shunt reg that will feed the I2S isolated input at 3.3v. Or at least it should do it. The problem is that it outputs 3.2v instead of 3.3. Do you think it could be a real issue?
Many thanks,
Gaetano.
Many thanks,
Gaetano.
Hi all, I'm slowly building a dam1021 dac and for now I'm working on the power supply. I just finished the Reflektor-D shunt reg that will feed the I2S isolated input at 3.3v. Or at least it should do it. The problem is that it outputs 3.2v instead of 3.3. Do you think it could be a real issue?
Many thanks,
Gaetano.
No, it's still inside the +-5%....
In the first firmware rev, I only reserved 256 Kbyte in the 1 Mbyte Flash for filters, didn't matter then as the filters started out as 1K filters.
Now with larger filters you have to be careful what you do, a 4K filter is 16 Kbyte, and with seperate filters for all types and all samlerates, you can fill up those 256 Kbyte, and then there is also the DSD filters....
I'm also looking to move to 36 bit or 40 bit filters, so at some time I might reorganize things a little, there is no need to reserve 256Kbyte for the uC, although thery're are available with 256 Kbyte flash, I have never used larger than the 64 Kbyte version.
In next gen boards I will move up to 2 Mbyte flash, mostly to have space for a larger FPGA. But don't hold out for anything soon on the boards, first up is the dac2541, a successor to the dac1541....
Plus the larger the file, the longer time it takes to download....
@soekris
dac2541!
Hope you can share more details soon.
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