专利汇可以提供Digital multi-frequency receiving system专利检索,专利查询,专利分析的服务。并且PURPOSE: To reduce the multiplication frequency for the receiver as a whole and to constitute the receiver with the general-purpose processor by including part of the multiplication of the discrete Fourier conversion into the wind function multiplication.
CONSTITUTION: The 80 units of the sample signal which are sampled during the least common multiple 10m sec. in the cycle of the multi-frequency signal frequency are turned to signals X
0 ∼X
79 which are multiplied by the wind function and then divided into 5 groups to be applied to 5 high-speed Fourier conversion parts 1∼5. These conversion parts are constituted so that the multiplying frequency may be reduced by including the necessary multiplication into the wind function. At the same time, the operation is omitted for the output in which the partial output of the high-speed Fourier conversion is turned to the common-profit complex number. The output of the conversion parts are compounded together so that the output corresponding to the same frequency each may be all multiplied to be converted into Fourier conversion output X
7 , X
9 ...X
17 against frequency 700, 900, 1100, 1300 and 1700Hz composing the MF signal.
COPYRIGHT: (C)1979,JPO&Japio,下面是Digital multi-frequency receiving system专利的具体信息内容。
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