| 摘要 |
PURPOSE:To analyse frequency continuously with one band pass filter in the form of an analogue signal as it is, by using a circulation type analogue signal semiconductor delay element. CONSTITUTION:A voice input inputted from a microphone through a preamplifier 1 is inputted into analogue multiplexers 6, 7 alternately by negative phase control signals SW, *SW and writing and reading of a BBD 8, 9 are carried out alternately through clock pulses PC1, PC2 and then, its output is inputted into a band pass filter 2 through an analogue multiplexer 10. Further, its extracted signal is sampled by a peack hold 4 through a clock pulse PC3 and said signal is sent to a CPU as the voice pattern information through an AD converter 5. Accordingly, the frequency analysis is made continuously by one band pass filter 2 in the form of an analogue signal as it is. |
