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Some doubt about the “General Filter” Module

Question asked by ymwlike on Mar 25, 2013
Latest reply on Mar 26, 2013 by JJoseph


General Filtered in sigmastudio use,I use an external chip control ADSP21489,

There are some problems but in the General Filter here.

When "General Filter" gain value is zero or direct ( equivalent to:b0 = 1, b1 = 0, b2 = 0, a1 = 0, a2 = 0),System began slowly unstable until no sound.

but "General Filter" Gain changed to other values found no problem .

I do not understand is directly sigmastudio control was not aware that the problem,

and there is a strange phenomenon as shown below:

In sigmastudio ,Why a1, a2 is equal to 0 transmitted data but it will be 0x80000000.

Can help analyze problem?