| 摘要 |
PURPOSE:To obtain a characteristic equal to that when a pre-emphasis circuit is used by arranging the number (n) of series branches between band-pass filters and level varying circuit so as to provide a common voice input signal to one end thereof while an output signal is taken out of the other end thereof to analyze. CONSTITUTION:A voice signal is connected to the number (n) of variable amplifiers 2-5 with a common input via an output terminal 6 and center frequencies from each output connected to f1-fn band-pass filters 6-9 to obtain spectrum outputs at terminals 10-13. The locus of gains A1-An of variable amplifiers provides a pre-emphasis characteristic. Appropriate determination of S/N as orbitrary frequency element can facilitate the specturum analysis. |
