PROBLEM TO BE SOLVED: To estimate noise power without adjusting estimation parameters and without being influenced by a sudden change of input voice. SOLUTION: The noise estimation device 43 calculates the steady probability of the input power based on the value obtained by dividing the input power by the delay estimated noise power in the past by the number of delayed samples, and the steady probability of the number of buffer samples calculated most recently. The first is to take the weighted average of the input power weighted sum, which is the weighted sum of the past input power, and the weighted average of the current input power, with the steady probability sum, which is the sum of the probabilities, and the steady probability of the current input power as the weighting coefficient. The estimated noise power of the The second estimated noise power is calculated by taking a weighted average with the estimated noise power. [Selection diagram] Fig. 1
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