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对于有效的消除回声参数,R和T都必须接近于0。术语称之为反声衰减(ER)和传导损耗(TL)。ER=-20 ogR_p(1.45)TL=-20logT_p(1.46)传导损耗描述了声音从声源传播1米距离所衰减的数值。与此类似,反声衰减描述了反射信号衰减的强度。在一个无衰减的媒介中,声音的传播是恒速的。声音的速度根据公式1.37所描述,
For effective echo cancellation, both R and T must be close to zero. The terms are called anti-acoustic attenuation (ER) and conduction loss (TL). ER = -20 ogR_p (1.45) TL = -20logT_p (1.46) The conduction loss describes the attenuation of sound as it travels from a sound source by 1 meter. Similarly, anti-acoustical attenuation describes the intensity of reflected signal attenuation. In a non-decaying medium, the spread of sound is constant. The speed of sound is as described in Equation 1.37,