Digital signal sn measuring apparatus

Abstract

Abstract PURPOSE: To achieve a simultaneous measurement of signal and noise levels with a simple construction by multiplexing external input digital signals. CONSTITUTION: An external input digital signal is applied to a multiplexing converter 6 whose output is impressed on a digital filter 7. After the signal and noise components extracted with a digital filter 7 is square detected with a square multiplier 10, they are applied to a digital integrator 14. Two unit delaying devices 12 and 13 composing a digital integrator 14 respectively provide integral outputs of the signal and noise components and the level difference between the signal and the noise is determined with a subtractor 17 after logarithmic conversion by logarithmic converters 15 and 16. The signal of the difference is represented by the SN value and indicated on the display. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Kohei Ono
• 👤 Hiroshi Yoshimura
• 👤 Tomonori Aoyama

Bibliographic Details