方差 ε\varepsilon\varepsilon 为 E(e[n]2)E\left(e[n]^{2} \right)E\left(e[n]^{2} \right)
E(x)是x的数学期望，即为对误差平方的期望为方差。
3 Matching Annotations
- Nov 2023
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zhuanlan.zhihu.com zhuanlan.zhihu.com
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- Sep 2023
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www.webofscience.com www.webofscience.com
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A 16-channel electrotactile digital vocoder for artificial hearing is developed that uses FFT spectral analysis techniques instead of the conventional bank filtering. Temporal coding of individual electrotactile current pulses is accomplished by a neuronlike encoding algorithm. This design is implemented with dual processors and used in psychophysical experiments to improve speech information transmission. Results indicate no loss of information compared with conventional designs. Such digital vocoders offer the advantages of reliable operation and signal enhancement to improve tactile speech perception by the deaf.
这是关于一种用于人工听觉的16通道电触觉数字声码器的解释。该声码器采用FFT频谱分析技术，而不是传统的滤波器组。通过一种类似神经元的编码算法，对个别电触觉电流脉冲进行时间编码。该设计采用双处理器实现，并在心理物理实验中使用，以改善语音信息传输。结果表明，与传统设计相比，没有信息损失。这种数字声码器具有可靠运行和信号增强的优点，可以改善聋人的触觉语音知觉。
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- Jul 2022
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mp.weixin.qq.com mp.weixin.qq.com