2021-06-08 11:36 PM
If I have a signal sampled at 16384/32768Hertz, but I am only interested in frequencies below 2000Hz - can I use the FMAC to automatically produce a buffer of FIR filtered samples at 4096Hz? I think some hardware filter accelerators have a decimation register for specifying the down sample rate.
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2021-06-11 9:39 AM
Hello @Community member ,
The down-sampling feature is not included in the current version of the FMAC.
Nevertheless, the FMAC is ideally suited for implementing a low pass decimation filter, the down-sampling can be done by simply discarding samples, for example 3 in every 4 in the case of a decimation by 4.
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Imen
2021-06-11 9:39 AM
Hello @Community member ,
The down-sampling feature is not included in the current version of the FMAC.
Nevertheless, the FMAC is ideally suited for implementing a low pass decimation filter, the down-sampling can be done by simply discarding samples, for example 3 in every 4 in the case of a decimation by 4.
When your question is answered, please close this topic by choosing "Select as Best". This will help other users find that answer faster.
Imen
2021-06-13 10:40 PM
Yes, you can discard samples not needed, but the FMAC has wasted processing for samples not needed - perhaps this makes little difference to the micro's power consumption. The beauty of an FIR low pass decimation filter is that you only have to process the samples you need - if it saves power you might want to consider the down-sampling option for some future versions of the FMAC.