Can oversampling decrease the delay of digital IIR filter? Imagine there is some digital signal going into processor that applies low pass filter.Lets say its 1 KHz sample rate and the filter is second order gaussian lowpass with -3db point at 100 Hz.
The putput of this digital filter will be delayed,this delay will vary with frequency.Can this delay,in the band of our interest which is 0 - 500 Hz for 1 KHz sample rate,be decreased if we increase the sample rate of the incoming signal?
What if the incoming signal was 2 KHz samplerate ( 2x oversampling ),would it decrease the digital filter delay?
I have read that the delay can be decreased by increasing bandwidth or by putting -3db cut off point higher in frequency.Is that true? I know making the low pass have higher frequency decrease the delay,but what about the bandwidth?
If we increase the sample rate,we increase the bandwidth,but in case of low pass filter it will be the bandwidth thats being attenuated.I have feeling that the author who wrote about the bandwidth thing meant the passband bandwidth and in that case its same thing as making the low pass higher.
I tried two filter simulating softwares,the Iowa Hills IIR and MicroModeler.com and got conflicting results.The Iowa Hills showed that the delay in the band of interest is increased slightly by oversampling while MicroModeler showed small decrease.
Does oversampling increase,decrease or not change the delay?