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SM6801A Datasheet(PDF) 10 Page - Nippon Precision Circuits Inc |
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SM6801A Datasheet(HTML) 10 Page - Nippon Precision Circuits Inc |
10 / 16 page SM6801A SEIKO NPC CORPORATION —10 Input Equalizer (IN, EQP, EQN) An input equalizer network can be connected to pins IN, EQP and EQN, as shown in the input equivalent cir- cuit and equalizer circuit below. The frequency response of the equalizer circuit is given by the following equation, where ƒ is the frequency. Dynamic Range Compression Mode (DRCN) The dynamic range compression mode is set when DRCN is LOW. When a compression mode is used, the gain for small input signals is increased while large input signals are converted using a curve that performs soft-clip- ping. This increases the average sound pressure level emitted from the speaker during playback. EQN VREF1 EQP 5 6 R04 R03 C03 C04 R01 60k R02 C02 60k IN 4 C01 IN' + − Response = 20 × log 10 [dB] 11 60000 1 R04 ++ + 2πƒC04 1 2 πƒC03 R03 + + 1 2 πƒC01 1 1 60000 1 R01 + 1 + 1 2 πƒC02 R02 + 1 -20 -15 -10 -5 0 5 10 -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 -40 -35 -30 -25 Input [dBV] normal mode DRC mode |
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