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要计算数字地震仅对每次记录的量化信噪比,须首先知道地震信号子样幅值的概率分布密度根据对地震信号子样幅值的统计,可取瑞利分布作为冲击型振源(?)发的地震信号子样幅值的概率分布。在讨论了效字地震仅量化信噪比之后,给出了仪器的量化信噪比与地震子样幅值均值的关系以及使仪器获得最佳量化信噪比的仪器前放增益的选择范围、即:欲使仅嚣对某一道量化信噪比不低于120 dB,该道每次接收的地震信号经前放放大后的子样幅值的均值(?)应在V/25～V/3(V为量化器的最大量化值)之间。
To calculate the quantized signal-to-noise ratio of a digital earthquake only for each record, we first know the probability distribution density of the sub-sample amplitude of the seismic signal. Based on the statistics of the sub-sample amplitude of the seismic signal, the Rayleigh distribution can be taken as the impact vibration source. ) Probability distribution of amplitude of sub-samples of seismic signal. After discussing the validity of quantized signal-to-noise ratio (RMSE), the paper gives the relationship between the quantized signal-to-noise ratio of the device and the mean value of the amplitude of the seismic subsample and the selection range of the preamplifier gain for the instrument to obtain the best SNR. In other words, the average signal amplitude (?) Of each sub-sample amplitude of the received seismic signal after the pre-amplification of the channel should be in the range of V / 25 to V / 3 (V is the quantizer’s largest quantized value).