我有一个程序，它使用 surf 函数将在 NI USB DAQ 中获得的数据实时绘制到频谱图上。我想使用某种窗口函数来改善绘图的外观。我的问题是：哪个窗口函数最适合用于此？以及如何实施？这是我当前代码的示例：

fprintf('Initializing DAQ\n');
s = daq.createSession ('ni');
addAnalogInputChannel(s, 'Dev1','ai1', 'Voltage'); 


s.NumberOfScans = Fs*Record_Time;
s.Rate = Fs;
s.Channels.Range = [-1 1];
s.DurationInSeconds = 5;

Spect_nFFT = 2^8;
num_overlap = 19*round(Spect_nFFT/20);
start_sample = 1;

DataRdy = true;
% Run in background session

Lh = s.addlistener('DataAvailable', @(src,event) CaptureData(event.TimeStamps, event.Data));
s.NotifyWhenDataAvailableExceeds = 100000*.1;
s.IsContinuous = true;
s.startBackground();
NFFT = 2^nextpow2(L);
P = zeros(8193,50);
F = Fs/2*linspace(0,1,NFFT/2+1);
g=0;

while g==0

    while DataRdy == 0
        pause(.01)
    end
    pause(.5)

    Min_Threshold = 10^12;

    start_sample = 1;
    NFFT = 2^nextpow2(L); % Next power of 2 from length of myRecording
    FFT_Out = fft(myRecording(start_sample:end),NFFT)/size(myRecording(start_sample:end),1);
    FFT_Out = FFT_Out(1:NFFT/2+1);

    A = sqrt(FFT_Out.*conj(FFT_Out));
    P = [P(:,2:end), sqrt(FFT_Out.*conj(FFT_Out))];
    P(P<=max(max(P))/Min_Threshold)=max(max(P))/Min_Threshold;
    surf(1:size(P,2),F,10*log10(P),'edgecolor','none'); axis tight; 


    % Create updating spectrogram
    view(0,90); 

    xlabel('Time'); 
    ylabel('Hz');


    drawnow;

    DataRdy = 0;
    uicontrol('Style', 'pushbutton', 'String', 'Exit',...
    'Position', [20 20 50 20],...
    'Callback', 'g=g+1');

end
delete(Lh);
stop(s);

谢谢你的帮助！