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TA2123AF Scheda tecnica(PDF) 10 Page - Toshiba Semiconductor |
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TA2123AF Scheda tecnica(HTML) 10 Page - Toshiba Semiconductor |
10 / 20 page TA2123AF 2002-10-30 10 (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 Fig.3. And it is smoothed and detected by DET circuit (pin 36). 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 Fig.4. 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. Fig.4 Block diagram of bass boost 20kΩ 20kΩ 2R1 2R1 ATT BST R2 = 100kΩ R4 = 20kΩ C4 PWA PWC 27 28 31 34 33 32 20 21 A2 G3(ω) BPF G2(ω) HPF A1 G1(ω) LPF |
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