Многоскоростная обработка с EngeeDSP

function fftspectrum(sig, fs; nfft = nothing, onesided = nothing)
    if nfft != nothing
        nsamples = nfft;
        sig = sig[1:nfft];
    else
        nsamples = length(sig);
    end
    A = EngeeDSP.Functions.fft(sig);
    B = EngeeDSP.Functions.fftshift(A);
    S = (2*B)/nsamples;
    out = 10log10.(abs.(S.^2));
    df = fs/nsamples;
        if onesided == true
            f = 0:df:fs/2;
            out = out[Int(ceil(nsamples/2)):end]
        else            
            f = -fs/2:df:fs/2-df;
        end
    return out, f
end

import Pkg
neededLibs = ["WAV", "Base64"]

for lib in neededLibs
    try
        eval(Meta.parse("using $lib"))
    catch ex
        Pkg.add(lib)
        eval(Meta.parse("using $lib"))
    end
end

function audioplayer(s, fs);
    buf = IOBuffer();
    wavwrite(s, buf; Fs=fs);
    data = base64encode(unsafe_string(pointer(buf.data), buf.size));
    markup = """<audio controls="controls" {autoplay}>
                <source src="data:audio/wav;base64,$data" type="audio/wav" />
                Your browser does not support the audio element.
                </audio>"""
    display("text/html", markup);
end