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為何SDM ADC 第一級anti-alias filter cut off frequency 是20KHz??8 p. O s$ Z# ]5 `; C/ y
通常audio digital output sample rate is 44.1/48/96/192KHz
- @$ L, J, D; ~* pbut the first anti-alias filter in analog SDM ADC input is 20KHz
% L- n/ B/ q( H/ bif your sample rate is 192KHz, its fs/2 is 96KHz, 20KHz~96KHz will be attenuated by anti-alias filter, b+ T& [, |, J1 h
what is the difference with 48/96/192? the signal information is only under 20KHz.
4 b! J" o# e. T6 xwho can tell me what is the difference in this condition?
+ J; C( H# l) z: Z5 _and is it really used 20KHz as the anti-alias of SDM ADC for audio? |
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