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TA2160FNG Datasheet(PDF) 7 Page - Toshiba Semiconductor |
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TA2160FNG Datasheet(HTML) 7 Page - Toshiba Semiconductor |
7 / 17 page TA2160FNG 2004-05-11 7 (b) AGC circuit The AGC circuit of bass boost function is realized by the variable impedance circuit. The AGC DET circuit detects the low frequency level of center amplifier. When this level becomes high, the variable impedance circuit operates, and this circuit attenuates the input level of center amplifier. The AGC DET circuit is the current input, so that the output voltage of ADD amplifier is changed into the current ingredient by resistor Rb and capacitor C5 which are shown in Figure 2. And it is smoothed and detected by DET circuit (pin 14). And the direct current should not be applied to the AGC IN circuit, because, as for the circuit, the sensitivity setup is high. Moreover, the AGC signal level is decreased in case that the resistor R5 is connected with the capacitor C5 in series. And the AGC point can be changed. But the center amplifier is clipped in the low frequency in case that the resistor R5 is larger. (c) Bass boost The signal flow of bass boost function is as follows, refer to Figure 3. LPF (internal resistors 2R1 and external capacitor C1) → ATT (variable impedance circuit) → HPF (BST amplifier) → BPF (LPF: internal resistor R4 and external capacitor C3, HPF: external capacitor C4 and internal resistor R5) → Center amplifier The center amplifier signal becomes the reverse phase, because the phase of audio frequency range is reversed with two LPFs. 18 PWA PWB PWC 19 17 BST 22 23 C4 21 Rd Rc C2 C5 Rb Flow of the bass boost level 20 AGC DET ATT 14 24 Ra Ra Flow of the bass boost signal 11 8 Figure 2 Bass Boost System |
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