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TDA7404DTR データシート(PDF) 17 Page - STMicroelectronics |
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TDA7404DTR データシート(HTML) 17 Page - STMicroelectronics |
17 / 35 page TDA7404 Description of functionality 17/35 4.6 Soft-step 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 soft-step feature both kinds of clicks could be reduced to a minimum and are no more audible. Four programmable soft step time from one step to the next, are user selectable. Figure 9. Soft-step timing 1. For steps more than 1 dB the soft-step mode should be deactivated because it could generate a 1 dB error during the blend-time. 4.7 Bass There are three parameters programmable in the bass stage: 4.7.1 Attenuation Figure 10 shows the attenuation as a function of frequency at a center frequency of 80Hz. Figure 10. Bass control @ fC = 80 Hz, Q = 1 Time SS Time -1dB -2dB Vout 2dB 1dB -15.0 -10.0 -5.0 0.0 5.0 10.0 15.0 10.0 100.0 1.0K 10.0K dB Hz |
同様の部品番号 - TDA7404DTR |
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同様の説明 - TDA7404DTR |
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