def mask_signal(sig_stft, sig_mask):
    """ Reduces amplitude of time/frequency regions of a spectrogram based upon a mask 
        
    Arguments:
        sig_stft {[type]} -- spectrogram of signal
        sig_mask {[type]} -- mask to apply to signal
    
    Returns:
        sig_stft_amp [type] -- masked signal
    """
    sig_stft_amp = sig_stft * (1 - sig_mask)
    return sig_stft_amp