東急3000系日立車 モハラジオ収録(3LV-VVVF版・更新後)

[@YAJ54S12G-1]

The modulation method is similar to that of Chongqing Rail Transit Line 3:
ua-cam.com/video/5w-nLc5AiW4/v-deo.html

[@zeraneko]

Although it's slightly different, it's very similar to the sound before the update.