The methods of the evaluation of image fusion, which includes: entropy, cross entropy, mutual information, mean square error, root mean square error, peak-to-peak signal-to-noise ratio were presented.

介绍了图像融合的各种评价方法，包括：熵、交叉熵、交互信息量、均方误差、均方根误差、峰值信噪比。

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We built the above amplifier signal to improve the peak to peak audio signal.

我们建立的上述信号放大器，以改善峰峰值的音频信号。

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The measuring vibrating signal method may be used on real time, mean while, vibrating signal can be measured by peak to peak value or true virtual value .

对风机的振动量监测可以采用振动信号波形的实时监测，也可采用对峰峰值或有效值的实时监测。

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The problems include no signal, people only being able to make calls during off-peak hours and voicemail failing to save and record messages properly.

BBC: Anger over 'poor' Vodafone mobile network in Marlborough