| 摘要 |
PURPOSE:To realize application for the real low band pass filter group of the simple constitution as the polyphase circuit, by omitting the T(clock cycle)/2sec. switching control circuit and then applying the frequency offset. CONSTITUTION:Pre-process circuit is provided along with 1st and 2nd offset Fourier reverse converters 16 and 17, and the real low band pass filters are applied as the polyphase circuits 20 and 21 which are connected subsequently. The output of circuit 20 is supplied to 1st offset circuit 24 to receive the frequency offset, and then only the real number part is delivered. The output of circuit 21 is supplied to 2nd offset circuit 25 to receive the frequency shift, and then only the imaginary number part is delivered to the output end. Post-process circuit 29 uses the output of the two sets mentioned above as the input, applies the frequency offset to the input and delivers only the real number part of the result. Time-division multiple circuit 31 gives the time-division multiplication to the output mentioned above. |
