对数压缩 meaning in English

logarithmic compre ion
logarithmic compression

Then , digital quadrature envelope detection is used to detect the envelope of ultrasound as it is most used in the corresponding signal process . at last , we transform the signal to the range which can be displayed by the logarithm transform
有效补偿了超声传播过程中的吸收衰减;并将正交包络检波技术用于超声信号的幅度检测;最后通过对数压缩得到了显示需要的灰阶信号。