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TDA7402 Datasheet(PDF) 15 Page - STMicroelectronics |
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TDA7402 Datasheet(HTML) 15 Page - STMicroelectronics |
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15 / 59 page  15/59 TDA7402 1.6 SoftStep-Volume When the volume-level is changed audible clicks could appear at the output. The root cause of those clicks could either be a DC-Offset before the volume-stage or the sudden change of the envelope of the audiosignal. With the SoftStep-feature both kinds of clicks could be reduced to a minimum and are no more audible. The blend-time from one step to the next is programmable in four steps. Figure 6. SoftStep-Timing Note: For steps more than 0.5dB the SoftStep mode should be deactivated because it could generate a hard 1dB step during the blend-time. 1.7 Bass There are four parameters programmable in the bass stage: 1.7.1 Attenuation Figure 7 shows the attenuation as a function of frequency at a center frequency of 80Hz. Figure 7. Bass Control @ fC = 80Hz, Q = 1 1dB 0.5dB -0.5dB -1dB SS Time -1 5.0 -1 0.0 -5. 0 0.0 5.0 10.0 15.0 10 .0 10 0.0 1.0K 10 .0K dB Hz |
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