TAS5825M: Calculating Equalizer Coefficients

Simon Dahl

Part Number: TAS5825M

Dear Sir or Madam,
we would like to provide a graphic equalizer for our customers. For this we have to calculate the BQ coefficients in an external software and send them to the host MCU, which controls the TAS5825M.
For this I need the formula for calculating the BQ coefficients from existing frequency, gain and Q values.
In the process flows I find only the calculation for the internal coefficients, but without reference to frequency, gain and Q factor:

Do you have calculations for this or do I have to get them elsewhere?

Best regards,

Simon

over 4 years ago

0 Caro Walter over 4 years ago

TI__Mastermind 19612 points

Hello Simon,

We do not provide these formulas on e2e as it is TI proprietary information.

If you would like to implement on an external system, please feel free to use the end system integration tab in PPC3 application.

All the best,

Carolina

0 Simon Dahl over 4 years ago in reply to Caro Walter

Intellectual 375 points

Hello,
but that is not practical for us. We want to provide the end customer (consumer) with a parametric equalizer for different frequencies. Here the customer should be able to set the values for the gain and if necessary the Q factor for the frequencies (31.5Hz, 63Hz, 125Hz). Without calculation formula for the 5 coefficients b0, b1, b2, a1, a2 I can only try to change the value for the gain at constant frequency and reconstruct a formula from it. There should be a formula which is accessible here?
Otherwise the equalizer could only be adjusted to a fixed system only...

Best regards,

Simon

0 Caro Walter over 4 years ago in reply to Simon Dahl

TI__Mastermind 19612 points

Hello Simon,

I found an older TI document that provides the formulas that you are looking for.

Since this is publicly released, I may share with you.

All the best,

Carolina Configure the Coefficients for Digital Biquad Filters in TLV320AIc3xxx F....pdf

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TAS5825M: Calculating Equalizer Coefficients