## Forums More audiodsp

## Audio Equalizer Filter design

inI 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

inI 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

inHi - 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?

inHi-- 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?

inHi, 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

inDear 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

inHello, 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

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

inDear 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

inHi, 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.

### Ask a Question to the DSPRelated community

To **significantly** increase your chances of receiving answers, please make sure to:

- Use a meaningful title
- Express your question clearly and well
- Do not use this forum to promote your product, service or business
- Write in clear, grammatical, correctly-spelled language
- Do not post content that violates a copyright