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CXA1352AS Datasheet(PDF) 8 Page - Sony Corporation |
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CXA1352AS Datasheet(HTML) 8 Page - Sony Corporation |
8 / 17 page —8— CXA1352AS Description of Operation 1. Graphic equalizer • Conventional system Fig. 1. Fig. 1. indicates the conventional graphic equalizer system. This circuit performs boost and cut near “fO” controlled by the variable volume RV. (“fO” is resonance frequency determined by Z (s) (formed LCR).) The operation can be seen as follows : When the LCR circuit goes to the far left of RV, a state of graphic equalizer becomes maximum cut. At that time, assuming transmittance as T (s), we have T (s) = Z (s) Z (s)+ RO Here as Z (s) = sL+R+ 1 sC Then T (s) = LCs2+RCs+1 LCs2 + (R+Ro) Cs+1 Defining fo as fO = ωo , ωo as ωo = 1 , and Q as Q = ωoL , 2 π LC R we can obtain the frequency characteristics at cut. Also, when LCR circuit goes to the far right of RV, a state of graphic equalizer becomes maximum boost. At that time transmittance is : T (s) = Z (s) +RO = LCs2+ (R+Ro) Cs+1 Z (s) LCs2+RCs+1 Defining fo, ωo and Q as for cut, we can obtain the frequency characteristics at boost. VI R1 RV R2 R0=R1=R2 VO OPERATIONAL AMPLIFIER BOOST CUT L C Z (s) R |
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