做scipy.signal.spectrogram的时候，怎么知道会有多少个时间段？

Question

我有：

    frequencies, times, spectrogram = signal.spectrogram(
        samples, sample_rate, nperseg=nperseg, window=signal.hann(nperseg), noverlap=noverlap, mode='magnitude')

我有带sample_rate=16000的nperseg=320和noverlap=80。

我有232800样本。

但是，我的spectrogram.shape现在是(161, 969)。这就是161个频率段和969个时间段。这969是怎么计算出来的？

Answer 1

    time_per_segment_ms = 20
    nperseg = int(sample_rate * 0.001 * time_per_segment_ms)
    overlap = nperseg // 4

    seconds_per_segment = (nperseg - overlap) / sample_rate
    ms_per_segment = int(seconds_per_segment * 1000)

差不多就这样了。