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TA2123AF Scheda tecnica(PDF) 11 Page - Toshiba Semiconductor |
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TA2123AF Scheda tecnica(HTML) 11 Page - Toshiba Semiconductor |
11 / 20 page TA2123AF 2002-10-30 11 The transfer function of bass boost is as follows from Fig.4. G (ω) = G1 (ω)・A1・G2 (ω)・G3 (ω)・A2 The bass boost effect is changed by external resistor or external capacitor. The transfer function and cut off frequency are as follows. (1) Transfer function of LPF G1 (ω) = 1 / (1 + jωC1・R1) fL = 1 / 2πC1・R1 (2) Transfer function of BPF G3 (ω) = jωC4・R5 / [1 + jω (R4・C3 + R5・C3 + C4・R4) - ω2 R4・C3・R5・C4] C4 R5 C3 R4 2 / 1 O f × × × p = (3) HPF gain and cut off frequency G2 (ω) = 1 + R2 / (R3 + 1 / jωC2) fHC = 1 / (2 F R3・C2) Fig.5 BPF Graph.1 Characteristic of bass boost (4) fO and fL The fL and fO should be set up out of the audio frequency range. In case that the fO and fL is inside of audio frequency range and AGC circuit operates, the voltage gain decrease. (5) HPF The fHC should be made 1 / 2 or less frequency as compared with the fL or fO. The phase difference is large near the fHC, so that the bass boost level runs short. And the HPF gain of middle or high frequency range should be set to 10dB or more. A Ra Rb Ca Cb Frequency f (Hz) 30 −30 3 20 10 0 −10 −20 10 100 300 Total characteristic HPF fL fO LPF BPF |
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