PURPOSE: To simutaneously obtain all the Fourier-transform outputs and to output them as sine waves corresponding to the degrees of basic frequency with a simple constitution by connecting plural delay means with switched capacitors in a cascade and connecting coefficient multiplication means with the switched capacitors between an input edge and the respective delay means.
CONSTITUTION: The plural SC delay circuits 11, 12∼1n are connected to the input edge 10 to which input signals are given. The circuits 11, 12∼1n sequentially delay the input signals and output the signals corresponding to a specified time series. And the SC coefficient multiplication circuit 20 is connected to the input edge 10 and the SC coefficient multiplication circuits 21, 22∼2n are connected to the outputs of the respective circuits 11, 12∼1n. Now, a constant is set, which is obtained when the circuits 11, 12∼1n sequentially delay the input signals to the circuits 20, 21, 22∼2n. The outputs from the respective circuits 20, 21, 22∼2n are added in an addition circuit 5 and then the signals corresponding to the basic frequency are outputted as the form of sine wave with a simple constitution of the circuit.
NAKANISHI ISAO
SASAKI ITSUO
KANEHIRA AKIRA
KASAI TAMOTSU
| JPS6028319A | 1985-02-13 | |||
| JPS52109354A | 1977-09-13 |