spectrogram

问题 How to generate file including spectrum of frequencies of wav/riff sound file? I would like to use linux command line. I know the cool sox function to generate png spectrograms sox sound.wav -n spectrogram But I do not need visual representation of the spectrum of frequencies. I just want to get spectrum of frequencies in data file so I can work on them. I believe that there must be an option using sox. Sox need to generate that data before plotting it. How to get this? Not sure, maybe the

问题 The following code generates a spectrogram using either scipy.signal.spectrogram or matplotlib.pyplot.specgram . The color contrast of the specgram function is, however, rather low. Is there a way to increase it? import numpy as np from scipy import signal import matplotlib.pyplot as plt # Generate data fs = 10e3 N = 5e4 amp = 4 * np.sqrt(2) noise_power = 0.01 * fs / 2 time = np.arange(N) / float(fs) mod = 800*np.cos(2*np.pi*0.2*time) carrier = amp * np.sin(2*np.pi*time + mod) noise = np

问题 I have a program in MATLAB which I want to port to Python. The problem is that in it I use the built-in spectrogram function and, although the matplotlib specgram function seems identical, I'm getting different results when I run both. These is the code I've been running. MATLAB: data = 1:999; %Dummy data. Just for testing. Fs = 8000; % All the songs we'll be working on will be sampled at an 8KHz rate tWindow = 64e-3; % The window must be long enough to get 64ms of the signal NWindow = Fs

问题 I'm using matplotlib's specgram function to generate a spectrogram. I've attempted to include a colorbar off to the right of the spectrogram to give an indication of dB-to-color-mapping. For some reason though, the dB indicated by the colorbar do not make sense. Perhaps I've not generated the colorbar correctly? Perhaps there is some parameter that I need to pass to specgram? The signal I'm generating is a 1Khz, 2Vpp sine sampled at 32Khz. I'm expecting that the dark red peak on the

问题 For a project I need to be able to generate a spectrogram from a .WAV file. I've read the following should be done: Get N (transform size) samples Apply a window function Do a Fast Fourier Transform using the samples Normalise the output Generate spectrogram On the image below you see two spectrograms of a 10000 Hz sine wave both using the hanning window function. On the left you see a spectrogram generated by audacity and on the right my version. As you can see my version has a lot more

问题 For a project I need to be able to generate a spectrogram from a .WAV file. I've read the following should be done: Get N (transform size) samples Apply a window function Do a Fast Fourier Transform using the samples Normalise the output Generate spectrogram On the image below you see two spectrograms of a 10000 Hz sine wave both using the hanning window function. On the left you see a spectrogram generated by audacity and on the right my version. As you can see my version has a lot more

问题 Hi im very new to this thing so please bear with me. I am trying to convert a WAV file to a spectrogram but arent sure how to begin with. I read on something that says to read the PCM data(which i think is my WAV file) and store it in an array in the WavReader class before apply the FFT on it and converting it to GUI. Im currently using Naudio to achieve this but could not find anything that shows how to convert the WAV file to a spectrogram. Thanks Edit : I found out about converting PCM to

问题 I am trying to obtain spectrogram of a wav file in python. But it gives the error: 'module' object has no attribute 'spectrogram'. Here is the code : import scipy.io.wavfile from scipy.io.wavfile import read from scipy import signal sr_value, x_value = scipy.io.wavfile.read("test.wav") f, t, Sxx= signal.spectrogram(x_value,sr_value) Is there also any way to obtain the spectrogram of a wav file? 回答1: Using scipy.fftpack we can plot fft contents as spectrogram. ** This is based on my old

问题 I record a daily 2 minutes radio broadcast from Internet. There's always the same starting and ending jingle. Since the radio broadcast exact time may vary from more or less 6 minutes I have to record around 15 minutes of radio. I wish to identify the exact time where those jingles are in the 15 minutes record, so I can extract the portion of audio I want. I already started a C# application where I decode an MP3 to PCM data and convert the PCM data to a spectrogram based on http://www

问题 As part of a research project, I would like to analyze a sound file by generating it's spectrogram. I have been able to successfully generate the spectrogram of the wave file in matlab with frequency on the y-axis and the time on the x-axis. I would however, like to generate the spectrogram with the frequency on the x-axis and the time on the y-axis. How can this be done? I have searched through stack and have not found any accepted answers. My code which generates the spectrogram with the