Questions tagged [biquad]
Biquad is referred to either analog or digital second order filters
14
questions with no upvoted or accepted answers
2
votes
0
answers
60
views
How do I obtain narrowband reverberation times in the bass range to detect room modes?
I calculate my impulse response according to this principle. Calculating the inverse filter for the (exponential) sine sweep Method. With the obtained impulse response I calculate my reverberation ...
1
vote
0
answers
145
views
High pass biquad cascade transposed direct form II low frequency accuracy
I'm quite new to DSP and I'm trying to implement high pass biquad cascade in transposed direct form II. Currently my implementation has very poor accuracy at cutoff frequencies that are less than 5kHz ...
- 11
1
vote
0
answers
250
views
Issue with the Massberg Analog-Matched Low Pass Filter
Implemented the filter mentioned in title using Octave and couple sources Vicanek and Zeitlin (LPF.cpp). Got filter working otherwise but, ... when tested the responses against 'analog model' of the ...
- 917
1
vote
0
answers
53
views
Is there any audio DSP without biquad constraint?
I found a codec with audio DSP, ADAU1772. It supports 32 biquads, that is $32\cdot5=160$ parameters.
I need to calculate filter coefficients on-line. The result is in transfer function form, i.e.,
$...
- 271
1
vote
0
answers
471
views
Biquad Filter Optimization
I would like to try optimize a bit more the biquad filters indended for RIAA/non-RIAA equalization at low samplerates (44.1/48kHz).
Are there any open source optimization libraries (C, C++ or C#) out ...
- 917
1
vote
0
answers
417
views
IIR biquad coefficients for negative frequencies in IQ data?
Assume I have a (single real float channel) biquad IIR filter implemented in C, and some coefficients for a bandpass filter (right out of RBJ's cookbook).
If I convert the input, output, data path, ...
- 35.3k
0
votes
0
answers
286
views
Discrepancy in frequency response of biquad filter (in Python)
I have written a simple biquad filter class but when I check its frequency response, I get different results with different methods. If I check it "empirically" (by taking the FFT of its ...
0
votes
0
answers
166
views
Biquad Type-II Coefficient Generation
I have a Biquad II filter implementation in my embedded environment and I'm trying to find some equations to generate the coefficients for it.
I have already found the Audio Eq Cookbook, which simply ...
0
votes
0
answers
126
views
PeakEq center frequency does not match frequency response
Following the Cookbook i calculed these coefficients:
...
- 147
0
votes
0
answers
444
views
Software implementation recipe of cascaded Biquad IIR filter
I have been given the task of measuring the performance of Biquad IIR filters on a new CPU that we are evaluating.
What I know is that the Biquad filters can be cascaded to form higher order filters.
...
- 279
0
votes
0
answers
206
views
Combining IIM and MZT transformation
Split from thread: Correcting Impulse Invariance Method
Back to this subject. Matt L suggested combining IIM and MZT b-coeffs to get the filter response improved at hihger frequency area.
Couldn't ...
- 917
0
votes
0
answers
1k
views
Biquad high-pass filter - calculating filter slope
I have to design high-pass IIR Biquad filter with cutoff frequency of 80Hz, sampling frequency 24kHz, and filter slope of 24dB/oct @ 80Hz. I have used formula for HPF biquad coefficients from here. ...
- 308
0
votes
0
answers
246
views
biquad decomposition from given magnitude response
I have a adaptive FIR filter of length 84 with magnitude response , which is close to low pass. (Please see the attached figure). I need to design filter that has a magnitude response opposite of the ...
- 169
0
votes
0
answers
184
views
Second-order sections from complex coefficients
I have an impulse response ir that I need to approximate with an iir because of realtime requirements. For stability I want to break down the 10th order IIR generated with Steiglitz-Mcbride to biquads ...
- 1,133