| 摘要 |
PURPOSE:To display waveforms of two channels by reversing 180 degrees each other, by comparing the level of a reference signal with an input audio signal at each one horizontal scanning period in synchronizing with a horizontal synchronizing signal, and applying a signal corresponding to the difference to a picture tube. CONSTITUTION:A reference signal and input audio signals C1, C2 are compared at one horizontal scanning period in synchronizing with a horizontal synchronizing signal HS, and a signal (f) in response to the difference is applied to a picture tube 9, then a waveform through the combination of horizontal scanning lines in response to the level change in the input audio signals is drawn on a screen of the picture tube 9, so that the left and right direction on the screen can represent the magnitude of the level of the audio signal. |
