| 摘要 |
In a signal processing device which performs data compression, a thinning circuit 1 generates thinned data by thinning input PCM data. For example, when a sampling rate fs of the PCM data (original data) is fs=10 Hz, thinned data of fs=1 Hz is generated. The determination circuit 2 controls the selection circuit 4 so that, based on the following expression: <?in-line-formulae description="In-line Formulae" end="lead"?>TOTAL1=|X(n)-X(n-1)|+|X(n-1)-X(n-2)|+ . . . +|X(n-8)-X(n-9)|<?in-line-formulae description="In-line Formulae" end="tail"?> if TOTAL 1> C 1 , the input PCM data is selected, and if otherwise the thinned data is selected. The selected data and the determination result information of the determination circuit 2 are written into a memory 3 . Therefore, data compression is performed with respect to original data with a simple circuit configuration and without losing required information of the original data.
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