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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STAMP0 датащи(PDF) 16 Page - STMicroelectronics |
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STAMP0 датащи(HTML) 16 Page - STMicroelectronics |
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16 / 62 page  Architecture STAMP0 16/62 DocID028639 Rev 1 4.2.1 Decimation filters The STAMP0 provides a decimation section that is used to convert the sample rate from 64 x Fs to Fs. The decimation is performed using three FIR filters (STAGE1, STAGE2 and STAGE3). Each filtering stage has a decimation factor of 4, consequently both the number of TAPS and coefficient values are different. The total FIR frequency response (with respect to PDM frequency) is shown in Figure 6: "Downsampling FIR frequency response (overall)" and the characteristics are listed in Table 7: "Downsampling section overall characteristics". Figure 6: Downsampling FIR frequency response (overall) Table 7: Downsampling section overall characteristics Symbol Parameter Min. Typ. Max. Unit PBW Pass band relative to PDM sampling frequency 0.00703125 SBW Stop band relative to PDM sampling frequency 0.078125 OOBA Out of band attenuation 100 dB IBR In band ripple 0.1 dB LT Total latency 562 PDM samples Obsolete Product(s) - Obsolete Product(s) |
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