# fir's questions - English 1answer

243 fir questions.

### Estimating frequency when there's little isolation between signal and noise frequencies

Say I have a signal which is guaranteed to have a frequency between 110-120 Hz but is corrupted by interference signals that're very close to this frequency range. For example, let the interference ...

### 1 How to properly match bit growth of a FIR filter with a reference value

1 answers, 273 views fir deconvolution bitdepth
I am trying to implement a chain of CIC/FIR filters on an ZYNQ FPGA. Using the Xilinx FIR compiler works fine so far but I am unable to properly get all the math. At the moment I have 2 chains of ...

### 1 Implementation of halfband pass filter

0 answers, 30 views filter-design fir interpolation
I need to interpolate a complex valued bandlimited periodic function using local interpolation. I can have the signal sampled at any frequency I want over at equispace intervals. I am aware that for ...

### Implementing an analog approximation of an FIR filter given its impulse response

1 answers, 143 views fir hardware-implementation
Problem: I have the impulse response of a matched filter(therefore its phase and magnitude response. See figure below) of a filter, and I need to implement its response using only off-the-shelf ...

### 1 How to obtain a meaningful group delay graph using matlab

1 answers, 97 views matlab fir group-delay
Problem: I'm trying to analyze the behavior of an FIR filter with the following impulse response/kernel: Using Matlab's function grpdelay(myKernel,length(myKernel)), I obtained the following figure:...

### Interpolated FIR filter group delay

I'm trying to design a digital low pass filter with a narrow transition band. My sampling rate is 25 kHz, the cut off frequency is 60 Hz & the transition band width is 4 Hz. I'm looking for about ...

### 1 How to find out the transfer function of a FIR filter?

1 answers, 328 views filters z-transform transfer-function fir

### 3 Group delay of the FIR filter

For an FIR filter, with symmetrical tap values $h[N-1-n]=h[n]$, why is the group delay $\frac{N-1}{2} T$ (where $N$ is the number of taps of the FIR filter and $T$ is the sampling time)? Why is ...

### 1 When is power of 2 FFT slower than smaller sized non power of 2 FFT in MATLAB

Knowing that computing an FFT is faster if the amount of samples is a power of 2 I have always tried to pad the inputs to Matlab's FFT with zeros until the next power of 2 is achieved. Matlab's ...

### Understanding and Correcting phase shift in General Linear Phase FIR filters

I have been learning about General Linear Phase Filters and the four standard FIR implementations. I was wondering in the case $\beta = \frac{\pi}{2}$ or $\beta = \frac{3\pi}{2}$ if there was a way ...

### 2 What is the transfer function of a moving average?

To make post-processing easier, I export scope measurements as CSV files, which are then post-processed (mostly in Microsoft Excel, which is not the best tool for the job, but it is all I have at my ...

### Why doesn't the delay of an FIR filter equal the number of taps but half of them? [duplicate]

I have seen the mathematical proofs that show that the delay of an FIR filter is half the filter order, i.e N/2. Yet I am still confused: When I look in the time domain, the output of the filter is:...

### What factor affect the maximum sampling frequency and suggest different improvement of the sampling frequency in FIR filter in FPGA?

0 answers, 18 views filters fir
I am trying to implement the FIR filter on FPGA. I am given the following three questions: (1) What factors affect the maximum sampling frequency? (2) Suggest some improvements of the sampling ...

### Convolution with an impulse response does not give the same result as the frequency response

Context I am trying to design a linear-phase FIR filter with the following frequency and phase responses: Designing the filter Given its characteristics (peak filter at 1kHz with 9dB gain and Q=7), ...

### 2 Linear-Phase FIR filters

2 answers, 105 views filters fir
I understand the four different type os FIR filters however i don´t understand why do linear-phase FIR filters offer opportunities for efficient realization.

### Why Low Pass filtered signal has half amplitude?

0 answers, 51 views lowpass-filter fir
I've some fix my problem and I've got the test code as the below ...

### Does only filter coefficients can represent it's own filter characteristic?

I'm wondering that does only filter coefficients can represent it's own filter characteristic? I found filter design tool as FILTERDESIGNER of matlab. that can make filter coefficients of low pass ...

### Compensate for FIR filter attenuation

1 answers, 48 views discrete-signals lowpass-filter fir
Is there a simple way to compensate for the reduction in amplitude of a low pass filter of a noisy sine wave signal that has been smoothed using a FIR filter so that the amplitude of the smoothed sine ...

### 1 What do high and low order have a meaning in FIR filter?

I'm new DSP fields, and slowly study of FIR Filer and with Matlab which is fir1 function. My question is that What do high and low order have a meaning in fir1 filter? I can't understand what does ...

### 1 Audio wave amplitude decreased after FIR filter

3 answers, 112 views audio fir bandpass
I am doing sampling and filtering for a 17KHz sine audio wave signal, the Nyquist frequency is about 20.8889KHz. I found the fact that this audio signal's amplitude decreased dramatically after it ...

### 17 How many taps does an FIR filter need?

4 answers, 11.202 views filter-design fir
I am looking to design a set of FIR filters to implement a low pass filter. I am also trying to reduce the latency of the signal through the filter so I am wondering what the minimum number of taps I ...

### Optimization‏ FIR filter

I have a doubt about this : Iterative methods for optimization‏ in FIR filter (on the one hand traditional like window,frequency sampling ,WLS,Remez Exchange...,on the other hand evolutionary methods ...