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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

programming FIR Filters for the ES9018 DAC as a cross-over?
programming FIR Filters for the ES9018 DAC as a cross-over?
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Old 6th February 2018, 08:47 PM   #1
marcelooms is offline marcelooms
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Join Date: Jan 2016
Default programming FIR Filters for the ES9018 DAC as a cross-over?

According to the data sheet, the ES9018 can be programmed to use custom coefficients in the 2 stage FIR filter.
The way how to enter the coefficients is the registry is described quite clearly. But does anyone know to calculate these coefficients?
Each of the 8 channels can be programmed to have its own filter. Would it not be an ideal solution to making it a great and simple cross-over?

I now run the cross-over on the PC, sending 8 channels over USB to XMOS and than to 4 I2S datalines to the ES9018.
If I knew how to model the filters, I could skip the PC filters.

I have been looking everywhere invain for information on it, and I'm no FIR/DSP expert. Does anyone know how to do this?
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Old 6th February 2018, 09:13 PM   #2
TNT is offline TNT  Sweden
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Join Date: Apr 2003
Location: Sweden
The ADC version has a broken programming function. Maybe the DAC works?? I cant recall anyone doing it.

Its programmed by entering biquads into a register. To know the registers one needs to sign a NTA with ESS.

It's a somewhat tuff territory...

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