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BA3840KV Scheda tecnica(PDF) 6 Page - Rohm |
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BA3840KV Scheda tecnica(HTML) 6 Page - Rohm |
6 / 8 page 560 Audio ICs BA3840KV FMeasurement circuit FCircuit operation (1) Preset graphic equalizer (1) Flat position By pulling up the FLAT pin to VCC, frequency characteris- tics become flat. (2) Rock position By pulling up the ROCK pin to VCC, low frequencies are boosted by about 7dB. High frequencies are also ad- justed to balance the subjectively heard sound. (3) Pop position By pulling up the POPS pin to VCC, mid-range frequencies are boosted by about 6dB and combined with the rock position characteristics. (4) Jazz position By open-circuiting the above three pins, low frequencies are boosted by 14dB. High frequencies are also adjusted to balance the subjectively heard sound. (2) Sound leak reduction circuit If the stereo output signal from the power amplifier is mixed and input to the DET 1 pin and the PLSS pin pulled up to VCC, the sound frequencies close to 5kHz that leak easily will be cut off in accordance with the volume. (3) MUTE pin If the MUTE pin is pulled up to VCC, the effective graphic equalizer position will be FLAT regardless of the selected position. (However, if the pop position has been selected, the mid-range boost will be maintained.) (4) DET 2 pin If the stereo output signal from the power amplifier is mixed and input to the DET 2 pin, the effective graphic equalizer position will be FLAT during high level output regardless of the selected position. (However, if the pop position has been selected, the mid-range boost will be maintained.) |
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