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TA2131FLG 数据表(PDF) 7 Page - Toshiba Semiconductor |
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TA2131FLG 数据表(HTML) 7 Page - Toshiba Semiconductor |
7 / 21 page TA2131FLG 2006-04-19 7 Function Explanation 1. Bass Boost Function 1-1 Description of Operation TA2131FLG has a bass boost function for bass sound reproduction built-in to the power amplifier. With the bass boost function, at medium levels and lower, channel A and channel B are added for the low frequency component, and output to BST amplifier 2 (BST2) in negative phase. That signal is inverted and added before being subjected to bass boost. If the signal of the low-frequency component reaches a high level, the boost gain is controlled to main a low distortion (see Fig.1). 1-2 AGC Circuit The AGC circuit of the bass boost function detects with “AGC DET” the voltage component created by “BST2,” and as the input level increases, the variable impedance circuit is changed, and the bass boost signal is controlled so that it is not assigned to BST amplifier 1. In this way, the bass signal to “BST2” input is shut-off, and that boost gain is controlled. 1-3 Bass Boost System As shown in Fig.1, the flow of the bass boost signal is that the signal received from power amplifier input goes through LPF1, ADD amplifier, ATT (variable impedance circuit), BPF1 (BST amplifier 1) and LPF2, and the negative phase signal to the power amplifier input signal is output from BST amplifier 2. The reason why it becomes the negative phase of the BST amplifier 2 signal is that the phase is inverted by 180° in the audible bandwidth by the secondary characteristics of LPF1 and LPF2 in Fig.1. Ultimately the main signal and the bass boost signal formed before BST2 are added. Fig.2 shows the frequency characteristics to each terminal. Figure 1 System Diagram of Bass Boost V (RL) DAC OUT 22 21 2 Vref AGC IN ADD LPF2 BST OUT BST NF1 Vref INA BST AGC BST2 PWA PWB 5 6 BST1 11 10 9 8 7 4 RL INB LPF1 DET OUTB BST NF2 OUTA 10 k Ω 10 k Ω 15 kΩ 10 k Ω 15 kΩ 10 k Ω 10 k Ω 20 k Ω 20 k Ω 10 k Ω 12 k Ω 5 k Ω 20 k Ω 30 k Ω 16 Ω 220 µF 1 µF 220 µF Vref Vref Vref V (LPF1) V (NF1) V (LPF2) V (BST OUT) V (NF2) V (OUT) RL 16 Ω 10 µF 10 µF |
类似零件编号 - TA2131FLG |
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类似说明 - TA2131FLG |
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