Audio Equalizer Filter design

Started by olsene01 in Audio Signal Processing8 years ago 2 replies

I have been attempting to design a 15 band audio equalizer using Simulink. My design right now is as follows (please let me know if there are any...

I have been attempting to design a 15 band audio equalizer using Simulink. My design right now is as follows (please let me know if there are any significant design flaws here): -Audio signal goes into preamp. -Preamp output is split into 15 branches, 1 for each filter. -Each branch contains a BPF, followed by a gain block. -The 15 branches are summed, and that is my output. The output so...


java fft problem

Started by ramboksg in Audio Signal Processing8 years ago 3 replies

I am trying to implement some algorithm in java that is originally done in matlab. One of the parts is fast fourier transform. In matlab code it...

I am trying to implement some algorithm in java that is originally done in matlab. One of the parts is fast fourier transform. In matlab code it looks as following: FY = fft(X,44100); Where according to http://www.mathworks.com/help/techdoc/ref/fft.html : Y = fft(X,n) returns the n-point DFT. fft(X) is equivalent to fft(X, n) where n is the size of X in the first nonsingleton dimension. If the l...


commercial acoustic echo cancellation licenses

Started by mv.b...@gmail.com in Audio Signal Processing9 years ago 2 replies

Hi - Could anyone please let me know if there's a company out there that has solved acoustic echo cancellation reasonably well for 44.1KHz...

Hi - Could anyone please let me know if there's a company out there that has solved acoustic echo cancellation reasonably well for 44.1KHz stereo audio, and probably provides licenses to their tech? Thanks!


what does 'decimated by factor 180' mean?

Started by mv.b...@gmail.com in Audio Signal Processing9 years ago 7 replies

Hi-- Could anyone please translate this for me: a signal is "decimated by factor 180"..? Does this mean that the signal is down-sampled...

Hi-- Could anyone please translate this for me: a signal is "decimated by factor 180"..? Does this mean that the signal is down-sampled such that only its alternate samples are picked? Thanks!


Can you trade frequency resolution for power?

Started by astrodoot in Audio Signal Processing9 years ago 3 replies

Hi, I am interested in detecting whether or not there is any periodicity in a bunch of very long time series. The lengths of the time series...

Hi, I am interested in detecting whether or not there is any periodicity in a bunch of very long time series. The lengths of the time series can be extremely long (e.g. 10^10 bins) and the periodic signals that might be present have periods of 1-10 bins or so. The data is very sparse. Because of the length of the time series a FFT would concentrate the power in a signal in a very very tiny f...


FM Signal FFT

Started by Kate in Audio Signal Processing9 years ago 1 reply

Dear all, I have two questions; I got really confused about them and I appreciate if you could help me. 1) I am interested in Received...

Dear all, I have two questions; I got really confused about them and I appreciate if you could help me. 1) I am interested in Received Signal Strength of FM broadcasting signal in different areas. I am really wondering whether it would be the amplitude of the FFT of the signal or the Power Spectrum Density (PSD) of that? 2) I collected data by sampling rate of 10MHz for 5 secs (My data...


Melodyne and 'Hit n Mix' - How do these products compare to research algorithms

Started by ben in Audio Signal Processing9 years ago 1 reply

Hello, I was wondering if anyone had done any direct comparisons between commercially available products such as Melodyne and Hit n Mix which...

Hello, I was wondering if anyone had done any direct comparisons between commercially available products such as Melodyne and Hit n Mix which on paper seem to have cracked pitch extraction and polyphonic recognition and the algorithms presented in research journals/conferences etc. Has anyone run any testing similar to that used at ISMIR? or produced F-measure scores etc? I find it intere...


Help regarding MATLAB code for Detector in Spectrograms

Started by shar...@yahoo.co.in in Audio Signal Processing9 years ago

Dear All, I am working in classifying birds based on their sounds in the audio data that is given to me. Currently I am working on an issue of...

Dear All, I am working in classifying birds based on their sounds in the audio data that is given to me. Currently I am working on an issue of removing rain drops in the spectrograms that I obtained from the audio data. I have been given the audio data that was recorded on the entire day. The recordings are 20 min at each time interval (For eg) 1-1:20, 2:20,... 23-23:20). I divided the aud...


Spectrogram - Axis & Energy

Started by shar...@yahoo.co.in in Audio Signal Processing9 years ago 2 replies

Dear all, I am doing research in audio processing. I have been asked to count the number of rain drops in a given audio recording. I need your...

Dear all, I am doing research in audio processing. I have been asked to count the number of rain drops in a given audio recording. I need your precious help for the following 2 questions 1) While I was obtaining the spectrograms for the individual chunks that I created, I am getting the resulting spectrograms to be like thin strips and I had to manually zoom in to see the actual spectrogram...


noise gate

Started by neir...@gmail.com in Audio Signal Processing9 years ago 2 replies

Hi, I need help with noise gate implementation.I have input wav file as byte array on which I have to implement noise gate.I have already done...

Hi, I need help with noise gate implementation.I have input wav file as byte array on which I have to implement noise gate.I have already done fft and calculated amplitude.I'm not sure what next should I do.I mean, I know basic procedure, but do I compare amplitude with threshold or something else? Is output = input * gate? Thanks in advance.


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