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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STA529 датащи(PDF) 19 Page - STMicroelectronics |
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STA529 датащи(HTML) 19 Page - STMicroelectronics |
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19 / 57 page  STA529 Digital processing Doc ID 13095 Rev 3 19/57 5.3 Volume control and gain The volume control structure of the STA529 consists of individual volume registers for each channel and a master volume register that provides an offset to each channel’s volume setting. The individual channel volumes are adjustable in 0.5-dB steps from +36 dB to -91.5 dB. As an example, if register LVOL = 0x00 or +36 dB and register MVOL = 0x18 or -12 dB, then the total gain for the left channel is +24 dB. When the mute bit is set to 1, all channels are muted. The volume control provides a soft mute with the volume ramping down to mute in 4096 samples from the maximum volume setting at the internal processing rate (around 48 kHz). Table 13. Master volume offset as a function of register MVOL MVOL[7:0] Volume offset from channel value 0x00 0 dB 0x01 -0.5 dB 0x02 -1dB …… 0x78 -60 dB …… 0xFE -105 dB 0xFF Hard master mute Table 14. Channel volume as a function of registers LVOL and RVOL LVOL/RVOL[7:0] Volume 0x00 +36 dB 0x01 +35.5 dB 0x02 +35 dB …… 0x47 +0.5 dB 0x48 0dB 0x49 -0.5 dB …… …… 0xFF -91.5 dB |
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