20 lines
502 B
Julia
20 lines
502 B
Julia
# plot a real-time spectrogram. This example is adapted from the GR example
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# at http://gr-framework.org/examples/audio_ex.html
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module SpectrumExample
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using GR, PortAudio, SampledSignals, FFTW
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const N = 1024
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const stream = PortAudioStream(1, 0)
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const buf = read(stream, N)
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const fmin = 0Hz
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const fmax = 10000Hz
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const fs = Float32[float(f) for f in domain(fft(buf)[fmin..fmax])]
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while true
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read!(stream, buf)
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plot(fs, abs.(fft(buf)[fmin..fmax]), xlim=(fs[1],fs[end]), ylim=(0,100))
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end
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end
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