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Re: Dynamic loudness in 1701

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    Hello Markus,

 

    The attached circuit may fill your needs.  It takes advantage of a recent addition to the ADAU1701's toolbox, the log-spaced lookup table.  This greatly simplifies dynamic controls like this one, by providing a numerical index that varies with the log of its input (a dB-sensitive table).  There has always been a base-2 log function built into the ADAU1701, now we can finally get at it.

dynamic-1701Loudness-control_pic.png

    All else that's needed is to set up two General Second-Order Index Selectable filters, one for bass and the other for treble.  Varying level chooses different filters, as shown in the Real-Time Display.  Built-in slewing renders the transitions inaudible, as long as the filters are closely-spaced.  I used ten filters plus flat.  Of course you can add more filters and adjust them in line with published curves; I just made it sound good to me.  Wish my stereo had one of these.

 

 

     Best regards,

 

     Bob


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